/* =========================================
    PT - Monospace Design System for PT™
    Theme: Warm Obsidian & Cyber Coral
    ========================================= */

/* =========================================
   MARK:  1. CORE VARIABLES & RESET
    ========================================= */
/* =========================================
    PT - Monospace Design System for PT™
    Theme: Cool Obsidian & Cyber Coral
    ========================================= */
:root {
    /* ---------- 1.1 Base palette ---------- */
    --c-white: #ffffff;
    --c-black: #000000;

    /* ---------- 1.2 Surfaces, borders, dividers ---------- */
    --c-bg: #0a0a0c;                   
    --c-surface: #131316;
    --c-surface-elevated: #1b1b1f;
    --c-surface-hover: #242429;
    --c-border: rgba(255, 255, 255, 0.08);
    --c-border-hover: rgba(255, 157, 122, 0.30);
    --c-divider: rgba(255, 255, 255, 0.09);

    /* ---------- 1.3 Text ---------- */
    --c-text-main: #f6f4f1;
    --c-text-main-accent: #ffefea;
    --c-text-secondary: #9a938c;  
    --c-text-tertiary: #6c665f;   
    --c-text-ghost: #565049;      

    /* ---------- 1.4 Accent (Cyber Coral) ---------- */
    --c-accent: #ff5533;                   
    --c-accent-hover: #ff7455;             
    --c-accent-bright: #ff9d7a;
    --c-accent-glow: rgba(255, 85, 51, 0.32);
    --c-accent-glow-strong: rgba(255, 85, 51, 0.55);

    /* Accent alpha ramp (255, 85, 51) */
    --c-accent-a02: rgba(255, 85, 51, 0.02);
    --c-accent-a04: rgba(255, 85, 51, 0.04);
    --c-accent-a05: rgba(255, 85, 51, 0.05);
    --c-accent-a06: rgba(255, 85, 51, 0.06);
    --c-accent-a08: rgba(255, 85, 51, 0.08);
    --c-accent-a10: rgba(255, 85, 51, 0.10);
    --c-accent-a15: rgba(255, 85, 51, 0.15);
    --c-accent-a18: rgba(255, 85, 51, 0.18);
    --c-accent-a20: rgba(255, 85, 51, 0.20);
    --c-accent-a25: rgba(255, 85, 51, 0.25);
    --c-accent-a30: rgba(255, 85, 51, 0.30);
    --c-accent-a35: rgba(255, 85, 51, 0.35);
    --c-accent-a40: rgba(255, 85, 51, 0.40);

    /* Accent-bright (peach) alpha ramp — 255, 157, 122 */
    --c-peach-a02: rgba(255, 157, 122, 0.02);
    --c-peach-a025: rgba(255, 157, 122, 0.025);
    --c-peach-a06: rgba(255, 157, 122, 0.06);
    --c-peach-a10: rgba(255, 157, 122, 0.10);
    --c-peach-a15: rgba(255, 157, 122, 0.15);
    --c-peach-a18: rgba(255, 157, 122, 0.18);
    --c-peach-solid: rgba(255, 157, 122, 1);
    --c-peach-highlight: rgba(255, 210, 190, 0.24);

    /* ---------- 1.5 Semantic states ---------- */
    --c-success: #4ade80;
    --c-warning: #fbbf24;
    --c-error: #f87171;
    --c-info: #38bdf8;                 

    --c-success-a08: rgba(74, 222, 128, 0.08);
    --c-success-a15: rgba(74, 222, 128, 0.15);
    --c-success-a40: rgba(74, 222, 128, 0.40);
    --c-warning-a08: rgba(251, 191, 36, 0.08);
    --c-warning-a15: rgba(251, 191, 36, 0.15);
    --c-warning-a40: rgba(251, 191, 36, 0.40);
    --c-error-a08: rgba(248, 113, 113, 0.08);
    --c-error-a15: rgba(248, 113, 113, 0.15);
    --c-error-a40: rgba(248, 113, 113, 0.40);
    --c-info-a08: rgba(56, 189, 248, 0.08);
    --c-info-a15: rgba(56, 189, 248, 0.15);
    --c-info-a40: rgba(56, 189, 248, 0.40);

    /* ---------- 1.6 White alpha ramp ---------- */
    --c-white-a02: rgba(255, 255, 255, 0.02);
    --c-white-a03: rgba(255, 255, 255, 0.03);
    --c-white-a04: rgba(255, 255, 255, 0.04);
    --c-white-a05: rgba(255, 255, 255, 0.05);
    --c-white-a06: rgba(255, 255, 255, 0.06);
    --c-white-a08: rgba(255, 255, 255, 0.08);
    --c-white-a10: rgba(255, 255, 255, 0.10);
    --c-white-a11: rgba(255, 255, 255, 0.11);

    /* ---------- 1.7 Black alpha ramp ---------- */
    --c-black-a28: rgba(0, 0, 0, 0.28);
    --c-black-a35: rgba(0, 0, 0, 0.35);
    --c-black-a40: rgba(0, 0, 0, 0.40);
    --c-black-a45: rgba(0, 0, 0, 0.45);
    --c-black-a55: rgba(0, 0, 0, 0.55);
    --c-black-a60: rgba(0, 0, 0, 0.60);
    --c-black-a70: rgba(0, 0, 0, 0.70);

    /* ---------- 1.8 Component-specific colors ---------- */
    --c-logo-accent: #ffb599;

    --c-badge-bg: rgba(200, 50, 19, 0.246); 
    --c-badge-text: #ff9d7a;

    --c-card-dark-bg: #08080a;
    --c-card-dark-border: rgba(255, 255, 255, 0.04);
    --c-card-dark-text: #ffffff;
    --c-card-dark-muted: #6b6b76;     
    --c-card-elevated-border: rgba(255, 255, 255, 0.08);

    --c-navbar-bg: rgba(10, 10, 12, 0.62);
    --c-navbar-bg-mobile: rgba(10, 10, 12, 0.85);
    --c-navbar-menu-bg: rgba(10, 10, 12, 0.96);

    --c-overlay: rgba(0, 0, 0, 0.72);

    --c-selection-bg: rgba(255, 85, 51, 0.35);
    --c-selection-text: #ffffff;

    --c-hero-tagline: #8a3d22;
    --c-hero-desc: rgba(255, 239, 234, 0.90);

    --c-grad-text-start: #f6f4f1;
    --c-grad-text-mid: #918a83;

    /* ---------- 1.9 Gradients ---------- */
    --grad-hero-1: linear-gradient(180deg,
        #ff9d7a 0%, #c2410c 55%, #1b1b1f 90%, #08080a 100%);
    --grad-hero-2: linear-gradient(180deg, #000000 0%, #1b1b1f 100%);
    --grad-text: linear-gradient(160deg,
        var(--c-grad-text-start) 0%,
        var(--c-grad-text-mid) 50%,
        var(--c-accent) 100%);
    --grad-text-accent: linear-gradient(135deg,
        var(--c-accent-bright) 0%, var(--c-accent) 100%);
    --grad-btn-sheen: linear-gradient(180deg,
        var(--c-white-a08) 0%, transparent 100%);
    --grad-card-shine: linear-gradient(90deg,
        transparent, var(--c-peach-a10), transparent);
    --grad-accent-fallback: linear-gradient(180deg, #2a140e 0%, #131316 100%);

    /* ---------- 1.10 Typography ---------- */
    --font-family: "JetBrains Mono", "SF Mono", "Fira Code", "Cascadia Code", "Consolas", monospace;
    --font-size-xs: 0.6875rem;
    --font-size-s: 0.8125rem;
    --font-size-m: 0.9375rem;
    --font-size-l: 1.125rem;
    --font-size-xl: 1.375rem;
    --font-size-2xl: 1.75rem;
    --font-size-3xl: 2.5rem;
    --font-size-4xl: 3.5rem;
    --font-size-5xl: 4.5rem;
    --font-size-e5xl: 10rem;

    /* ---------- 1.11 Spacing scale ---------- */
    --space-1: 4px;   --space-2: 8px;   --space-3: 12px;  --space-4: 16px;
    --space-5: 20px;  --space-6: 24px;  --space-8: 32px;  --space-10: 40px;
    --space-12: 48px; --space-16: 64px; --space-20: 80px; --space-24: 96px;
    --space-32: 128px; --space-40: 160px;

    /* ---------- 1.12 Radius scale ---------- */
    --radius-sm: 6px;  --radius-md: 10px; --radius-lg: 14px;
    --radius-xl: 18px; --radius-2xl: 24px;--radius-3xl: 48px;
    --radius-full: 9999px;

    /* ---------- 1.13 Layout ---------- */
    --container-width: 960px;
    --container-wide: 1200px;
    --section-spacing: 140px;
    --navbar-height: 56px;
    --navbar-offset: 20px;
    --scroll-padding-top: 100px;

    /* ---------- 1.14 Shadows ---------- */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.4), 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.5), 0 2px 4px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.6), 0 4px 8px rgba(0,0,0,0.5);
    --shadow-xl: 0 16px 48px rgba(0,0,0,0.7), 0 8px 16px rgba(0,0,0,0.6);
    --shadow-glow: 0 0 40px var(--c-accent-glow), 0 0 80px rgba(255, 85, 51, 0.12);
    --shadow-navbar: 0 4px 30px rgba(0, 0, 0, 0.30);

    /* ---------- 1.15 Glass system — base ---------- */
    --glass-bg: rgba(19, 19, 22, 0.55);
    --glass-bg-strong: rgba(10, 10, 12, 0.72);
    --glass-bg-subtle: rgba(19, 19, 22, 0.35);
    --glass-border: rgba(255, 255, 255, 0.11);
    --glass-border-hover: rgba(255, 255, 255, 0.20);
    --glass-border-subtle: rgba(255, 255, 255, 0.08);
    --glass-highlight: rgba(255, 255, 255, 0.15);
    --glass-highlight-strong: rgba(255, 255, 255, 0.22);
    --glass-inner-ring: rgba(255, 255, 255, 0.015);
    --glass-bottom-rim: rgba(0, 0, 0, 0.35);
    --glass-bottom-rim-strong: rgba(0, 0, 0, 0.45);
    --glass-bottom-rim-card-hover: rgba(0, 0, 0, 0.4);
    --glass-warm-bloom: rgba(255, 157, 122, 0.02);
    --glass-warm-bloom-strong: rgba(255, 157, 122, 0.03);

    /* ---------- 1.16 Glass system — blur ---------- */
    --glass-blur: blur(20px) saturate(180%) brightness(1.02);
    --glass-blur-strong: blur(10px) saturate(190%) brightness(1.04);
    --glass-blur-subtle: blur(5px) saturate(140%);

    /* ---------- 1.17 Glass system — shadows ---------- */
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
    --glass-shadow-strong: 0 16px 48px rgba(0, 0, 0, 0.6);
    --glass-shadow-subtle: 0 4px 20px rgba(0, 0, 0, 0.28);
    --glass-shadow-card-hover: 0 12px 40px rgba(0, 0, 0, 0.55);

    /* ---------- 1.18 Glass system — sheen & body ---------- */
    --glass-sheen: rgba(255, 255, 255, 0.10);
    --glass-sheen-mid: rgba(255, 255, 255, 0.025);
    --glass-sheen-strong: rgba(255, 255, 255, 0.13);
    --glass-sheen-strong-mid: rgba(255, 255, 255, 0.03);
    --glass-sheen-card: rgba(255, 255, 255, 0.09);
    --glass-sheen-card-mid: rgba(255, 255, 255, 0.02);
    --glass-sheen-hover: rgba(255, 255, 255, 0.14);
    --glass-sheen-hover-mid: rgba(255, 255, 255, 0.035);

    --glass-body: rgba(255, 255, 255, 0.06);
    --glass-body-end: rgba(255, 255, 255, 0.015);
    --glass-body-strong: rgba(255, 255, 255, 0.075);
    --glass-body-strong-end: rgba(255, 255, 255, 0.02);
    --glass-body-subtle: rgba(255, 255, 255, 0.04);
    --glass-body-subtle-end: rgba(255, 255, 255, 0.012);
    --glass-body-card: rgba(255, 255, 255, 0.05);
    --glass-body-card-end: rgba(255, 255, 255, 0.012);
    --glass-body-hover: rgba(255, 255, 255, 0.08);
    --glass-body-hover-end: rgba(255, 255, 255, 0.02);

    /* ---------- 1.19 Glass system — accent variant ---------- */
    --glass-accent-bg: rgba(28, 12, 8, 0.55);
    --glass-accent-border: rgba(255, 157, 122, 0.18);
    --glass-accent-body: rgba(255, 85, 51, 0.10);
    --glass-accent-body-end: rgba(255, 85, 51, 0.02);
    --glass-accent-sheen-mid: rgba(255, 85, 51, 0.05);
    --glass-accent-highlight: rgba(255, 210, 190, 0.24);
    --glass-accent-glow: rgba(255, 85, 51, 0.10);
    --glass-accent-focus: rgba(255, 85, 51, 0.28);
    --glass-accent-fallback-border: rgba(255, 85, 51, 0.38);

    /* ---------- 1.20 Glass system — hover accent ring ---------- */
    --glass-hover-ring: rgba(255, 157, 122, 0.08);

    /* ---------- 1.21 Transitions ---------- */
    --transition-fast: all 0.15s cubic-bezier(0.22, 1, 0.36, 1);
    --transition-smooth: all 0.35s cubic-bezier(0.22, 1, 0.36, 1);
    --transition-slow: all 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
    overflow-x: hidden;
    scroll-behavior: smooth;
    scroll-padding-top: var(--scroll-padding-top);
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    background-color: var(--c-bg);
    color: var(--c-text-main);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    letter-spacing: -0.01em;
    font-feature-settings: "tnum" 1, "ss01" 1, "zero" 1;
    overflow-x: hidden;
}

body.modal-open { overflow: hidden; }

img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; transition: var(--transition-smooth); }
ul { list-style: none; }

/* Skip link */
.skip-link {
    position: absolute;
    top: -100px;
    left: var(--space-4);
    z-index: 9999;
    padding: var(--space-3) var(--space-5);
    background: var(--c-accent);
    color: var(--c-white);
    border-radius: var(--radius-md);
    font-size: var(--font-size-s);
    font-weight: 600;
    transition: top 0.2s ease;
}
.skip-link:focus { top: var(--space-4); outline: 2px solid var(--c-white); outline-offset: 2px; }

/* Focus */
:focus { outline: none; }
:focus-visible { outline: 2px solid var(--c-accent); outline-offset: 3px; border-radius: var(--radius-sm); }

/* =========================================
   MARK:  2. TYPOGRAPHY
    ========================================= */
h1, h2, h3, h4, h5, h6 {
    font-weight: 500;
    letter-spacing: -0.05em;
    line-height: 1.12;
    margin-bottom: var(--space-5);
    font-feature-settings: "tnum" 1, "ss01" 1, "zero" 1;
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-l); font-weight: 600; }
h6 { font-size: var(--font-size-m); font-weight: 600; color: var(--c-text-secondary); }

p {
    font-size: var(--font-size-l);
    color: var(--c-text-secondary);
    font-weight: 400;
    line-height: 1.7;
    margin-bottom: var(--space-5);
}
p:last-child { margin-bottom: 0; }

/* Code-comment decorations */
h1:not(.hero-title)::before, h2::before {
    content: "// ";
    color: var(--c-text-ghost);
    font-weight: 400;
    font-size: 0.45em;
    vertical-align: middle;
    margin-right: 0.2em;
    opacity: 0.7;
}

h3:not(.card-title):not(.modal-title):not(.flex-center)::before {
    content: "/* ";
    color: var(--c-text-ghost);
    font-weight: 400;
    font-size: 0.5em;
    vertical-align: middle;
    margin-right: 0.2em;
}
h3:not(.card-title):not(.modal-title):not(.flex-center)::after {
    content: " */";
    color: var(--c-text-ghost);
    font-weight: 400;
    font-size: 0.5em;
    vertical-align: middle;
    margin-left: 0.2em;
}

.text-gradient {
    background: var(--grad-text);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
.text-gradient-accent {
    background: var(--grad-text-accent);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.text-large { font-size: var(--font-size-2xl); font-weight: 500; }
.text-small { font-size: var(--font-size-s); }
.text-xs { font-size: var(--font-size-xs); }
.text-muted { color: var(--c-text-secondary); }
.text-faint { color: var(--c-text-tertiary); }
.text-ghost { color: var(--c-text-ghost); }
.text-accent { color: var(--c-accent); }
.text-accent-bright { color: var(--c-accent-bright); }

.font-mono { font-family: var(--font-family); }
.font-normal { font-weight: 400; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }

.tracking-tight { letter-spacing: -0.04em; }
.tracking-normal { letter-spacing: -0.01em; }
.tracking-wide { letter-spacing: 0.05em; }

.leading-tight { line-height: 1.2; }
.leading-normal { line-height: 1.65; }
.leading-relaxed { line-height: 1.8; }

code, .code {
    font-family: var(--font-family);
    font-size: 0.9em;
    background: var(--c-surface);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--c-border);
    color: var(--c-accent-bright);
    font-feature-settings: "tnum" 1, "zero" 1;
}

pre, .pre {
    font-family: var(--font-family);
    background: var(--c-surface);
    padding: var(--space-6);
    border-radius: var(--radius-lg);
    border: 1px solid var(--c-border);
    overflow-x: auto;
    font-size: var(--font-size-s);
    line-height: 1.6;
    color: var(--c-text-secondary);
    position: relative;
}
pre code, .pre .code { background: none; border: none; padding: 0; color: inherit; font-size: inherit; }

/* =========================================
   MARK:  3. LAYOUT UTILITIES
    ========================================= */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--space-6);
}
.container-wide {
    max-width: var(--container-wide);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.section { padding: var(--section-spacing) 0; }
.section-sm { padding: var(--space-20) 0; }
.section-md { padding: var(--space-32) 0; }
.section-lg { padding: var(--section-spacing) 0; }
.section-first { padding-top: var(--space-12); }

.grid { display: grid; gap: var(--space-5); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-auto { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }

.gap-1 { gap: var(--space-1); } .gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); } .gap-4 { gap: var(--space-4); }
.gap-5 { gap: var(--space-5); } .gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); } .gap-10 { gap: var(--space-10); }

.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-start { align-items: flex-start; }
.items-center { align-items: center; }
.items-end { align-items: flex-end; }
.justify-start { justify-content: flex-start; }
.justify-center { justify-content: center; }
.justify-end { justify-content: flex-end; }
.justify-between { justify-content: space-between; }

.m-0 { margin: 0; }
.mt-1 { margin-top: var(--space-1); } .mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); } .mt-4 { margin-top: var(--space-4); }
.mt-5 { margin-top: var(--space-5); } .mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); } .mt-10 { margin-top: var(--space-10); }
.mt-12 { margin-top: var(--space-12); } .mt-16 { margin-top: var(--space-16); }
.mt-20 { margin-top: var(--space-20); }

.mb-1 { margin-bottom: var(--space-1); } .mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); } .mb-4 { margin-bottom: var(--space-4); }
.mb-5 { margin-bottom: var(--space-5); } .mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); } .mb-10 { margin-bottom: var(--space-10); }
.mb-12 { margin-bottom: var(--space-12); } .mb-16 { margin-bottom: var(--space-16); }
.mb-20 { margin-bottom: var(--space-20); }

.mr-1 { margin-right: var(--space-1); } .mr-2 { margin-right: var(--space-2); }
.mr-3 { margin-right: var(--space-3); } .mr-4 { margin-right: var(--space-4); }
.ml-1 { margin-left: var(--space-1); } .ml-2 { margin-left: var(--space-2); }
.ml-3 { margin-left: var(--space-3); } .ml-4 { margin-left: var(--space-4); }

.ml-auto { margin-left: auto; }
.mr-auto { margin-right: auto; }
.mx-auto { margin-left: auto; margin-right: auto; }

.p-0 { padding: 0; } .p-2 { padding: var(--space-2); }
.p-3 { padding: var(--space-3); } .p-4 { padding: var(--space-4); }
.p-5 { padding: var(--space-5); } .p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); } .p-10 { padding: var(--space-10); } .p-12 { padding: var(--space-12); }

.pt-4 { padding-top: var(--space-4); } .pt-6 { padding-top: var(--space-6); }
.pt-8 { padding-top: var(--space-8); } .pt-10 { padding-top: var(--space-10); }
.pt-12 { padding-top: var(--space-12); } .pt-16 { padding-top: var(--space-16); }
.pt-20 { padding-top: var(--space-20); }

.pb-4 { padding-bottom: var(--space-4); } .pb-6 { padding-bottom: var(--space-6); }
.pb-8 { padding-bottom: var(--space-8); } .pb-10 { padding-bottom: var(--space-10); }
.pb-12 { padding-bottom: var(--space-12); } .pb-16 { padding-bottom: var(--space-16); }
.pb-20 { padding-bottom: var(--space-20); }

.block { display: block; }
.inline { display: inline; }
.inline-block { display: inline-block; }
.hidden { display: none; }

.w-full { width: 100%; }
.h-full { height: 100%; }
.min-h-screen { min-height: 100vh; }

.overflow-hidden { overflow: hidden; }
.overflow-auto { overflow: auto; }
.overflow-x-auto { overflow-x: auto; }

.relative { position: relative; }
.absolute { position: absolute; }
.sticky { position: sticky; }

.border { border: 1px solid var(--c-border); }
.border-t { border-top: 1px solid var(--c-border); }
.border-b { border-bottom: 1px solid var(--c-border); }
.border-l { border-left: 1px solid var(--c-border); }
.border-r { border-right: 1px solid var(--c-border); }

.rounded-sm { border-radius: var(--radius-sm); }
.rounded-md { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-2xl { border-radius: var(--radius-2xl); }
.rounded-full { border-radius: var(--radius-full); }

.bg-bg { background-color: var(--c-bg); }
.bg-surface { background-color: var(--c-surface); }
.bg-surface-elevated { background-color: var(--c-surface-elevated); }

/* =========================================
   MARK:  6. BUTTONS
    ========================================= */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 22px;
    border-radius: var(--radius-md);
    font-family: var(--font-family);
    font-size: var(--font-size-s);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-smooth);
    border: 1px solid transparent;
    letter-spacing: -0.01em;
    font-feature-settings: "tnum" 1;
    gap: var(--space-2);
    position: relative;
    overflow: hidden;
    line-height: 1.2;
    white-space: nowrap;
}
.btn::after {
    content: "";
    position: absolute;
    inset: 0;
    background: var(--grad-btn-sheen);
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
}
.btn:hover::after { opacity: 1; }

.btn-primary {
    background-color: var(--c-accent);
    color: var(--c-white);
    border-color: var(--c-accent);
}
.btn-primary:hover {
    background-color: var(--c-accent-hover);
    border-color: var(--c-accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 20px var(--c-accent-glow), 0 0 40px var(--c-accent-a10);
}

.btn-secondary {
    background-color: transparent;
    color: var(--c-text-main);
    border-color: var(--c-border);
}
.btn-secondary:hover {
    border-color: var(--c-border-hover);
    background-color: var(--c-white-a03);
}

.btn-ghost {
    background-color: transparent;
    color: var(--c-text-secondary);
    border-color: transparent;
}
.btn-ghost:hover {
    background-color: var(--c-white-a04);
    color: var(--c-text-main);
}

.btn-text {
    background: transparent;
    color: var(--c-accent);
    padding: 0;
    border: none;
    overflow: visible;
}
.btn-text:hover { color: var(--c-accent-hover); }
.btn-text::after {
    content: " ->";
    opacity: 0.5;
    transition: var(--transition-fast);
    position: static;
    background: none;
    inset: auto;
}
.btn-text:hover::after { content: " =>"; opacity: 1; }

.btn-large { padding: 14px 28px; font-size: var(--font-size-m); }
.btn-small { padding: 6px 14px; font-size: var(--font-size-xs); }
.btn-icon { padding: 10px; aspect-ratio: 1; }

.btn:disabled, .btn.disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

.btn-group { display: inline-flex; gap: var(--space-2); }

/* =========================================
   MARK:  7. NAVIGATION
    ========================================= */
.navbar {
    position: fixed;
    top: var(--navbar-offset);
    right: var(--navbar-offset);
    z-index: 1000;
    background: var(--c-navbar-bg);
    border-radius: var(--radius-full);
    backdrop-filter: blur(20px) saturate(140%);
    -webkit-backdrop-filter: blur(20px) saturate(140%);
    border: 1px solid var(--c-border);
    height: var(--navbar-height);
    display: flex;
    align-items: center;
    padding: 0 var(--space-3);
    max-width: calc(100vw - var(--navbar-offset) * 2);
    box-shadow: var(--shadow-navbar);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-8);
    padding: 0 var(--space-4);
    width: 100%;
}

.logo {
    font-weight: 600;
    font-size: var(--font-size-m);
    color: var(--c-text-main);
    letter-spacing: -0.03em;
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    flex-shrink: 0;
}
.logo::before { content: "$"; color: var(--c-logo-accent); font-weight: 700; font-size: 0.85em; }
.logo::after {
    content: "_";
    color: var(--c-logo-accent);
    font-weight: 700;
    animation: blink 1.2s step-end infinite;
}
@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0; } }

.nav-links { display: flex; gap: var(--space-6); align-items: center; }

.nav-link {
    font-size: 11px;
    color: var(--c-text-secondary);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    transition: color 0.25s ease;
    position: relative;
    padding: var(--space-1) 0;
    white-space: nowrap;
}
.nav-link:hover { color: var(--c-text-main); }
.nav-link::after {
    content: "";
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--c-accent);
    transition: width 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}
/* JS scroll-spy active state */
.nav-link.active { color: var(--c-text-main); }
.nav-link.active::after { width: 100%; }

/* Mobile nav toggle */
.nav-toggle-input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
    width: 1px;
    height: 1px;
}
.nav-toggle {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    cursor: pointer;
    padding: var(--space-2);
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
    flex-shrink: 0;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}
.nav-toggle:hover { background: var(--c-white-a03); }
.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--c-text-main);
    transition: var(--transition-smooth);
    border-radius: 2px;
    transform-origin: center;
}
.nav-toggle-input:checked ~ .nav-toggle span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
    background: var(--c-accent);
}
.nav-toggle-input:checked ~ .nav-toggle span:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}
.nav-toggle-input:checked ~ .nav-toggle span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
    background: var(--c-accent);
}

/* =========================================
   MARK:  8. CARDS
    ========================================= */
.card {
    border: 1px solid transparent;
    background-color: var(--c-surface);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-smooth);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
}
.card::before {
    content: "";
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 1px;
    background: var(--grad-card-shine);
    opacity: 0;
    transition: opacity 0.4s;
}
.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-3px);
    border-color: var(--c-border-hover);
}
.card:hover::before { opacity: 1; }

.card-dark { background: var(--c-card-dark-bg); color: var(--c-card-dark-text); border-color: var(--c-card-dark-border); }
.card-dark p { color: var(--c-card-dark-muted); }
.card-elevated { background: var(--c-surface-elevated); border-color: var(--c-card-elevated-border); }
.card-interactive { cursor: pointer; }
.card-interactive:active { transform: translateY(-1px); }

.card-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: var(--space-4);
}

.card-title {
    font-size: var(--font-size-l);
    font-weight: 600;
    color: var(--c-text-main);
    margin-bottom: var(--space-2);
    line-height: 1.3;
}
h3.card-title::before, h3.card-title::after { content: none; }

.card-body { flex: 1; }

.card-footer {
    margin-top: var(--space-6);
    padding-top: var(--space-4);
    border-top: 1px solid var(--c-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    flex-wrap: wrap;
}

.eyebrow {
    text-transform: uppercase;
    font-size: 9px;
    font-weight: 600;
    letter-spacing: 0.12em;
    color: var(--c-accent);
    margin-bottom: var(--space-3);
    display: block;
}

.card-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    background: var(--c-accent-a10);
    border: 1px solid var(--c-accent-a20);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--c-accent);
    font-size: var(--font-size-l);
    margin-bottom: var(--space-4);
    transition: var(--transition-smooth);
}
.card:hover .card-icon {
    background: var(--c-accent-a15);
    border-color: var(--c-accent-a30);
    box-shadow: 0 0 16px var(--c-accent-glow);
}

/* =========================================
    MARK: 10. BADGES & TAGS
    ========================================= */
.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: 3px 10px;
    border-radius: var(--radius-full);
    background-color: var(--c-badge-bg);
    color: var(--c-badge-text);
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    border: 1px solid var(--c-accent-a20);
}
.badge-success { background: var(--c-success-a08); color: var(--c-success); border-color: var(--c-success-a15); }
.badge-warning { background: var(--c-warning-a08); color: var(--c-warning); border-color: var(--c-warning-a15); }
.badge-error { background: var(--c-error-a08); color: var(--c-error); border-color: var(--c-error-a15); }
.badge-neutral { background: var(--c-white-a04); color: var(--c-text-secondary); border-color: var(--c-border); }

.tag {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    background: var(--c-surface-elevated);
    color: var(--c-text-secondary);
    font-size: var(--font-size-xs);
    font-weight: 500;
    border: 1px solid var(--c-border);
    transition: var(--transition-fast);
    cursor: default;
}
.tag:hover { border-color: var(--c-border-hover); color: var(--c-text-main); }

/* Status pill */
.status-pill {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: 3px 10px;
    border-radius: var(--radius-full);
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 0.02em;
}
.status-pill::before {
    content: "";
    width: 5px;
    height: 5px;
    border-radius: 50%;
    display: inline-block;
}
.status-success { background: var(--c-success-a08); color: var(--c-success); border: 1px solid var(--c-success-a15); }
.status-success::before { background: var(--c-success); box-shadow: 0 0 6px var(--c-success-a40); }
.status-pending { background: var(--c-warning-a08); color: var(--c-warning); border: 1px solid var(--c-warning-a15); }
.status-pending::before { background: var(--c-warning); box-shadow: 0 0 6px var(--c-warning-a40); }
.status-error { background: var(--c-error-a08); color: var(--c-error); border: 1px solid var(--c-error-a15); }
.status-error::before { background: var(--c-error); box-shadow: 0 0 6px var(--c-error-a40); }
.status-neutral { background: var(--c-white-a03); color: var(--c-text-secondary); border: 1px solid var(--c-border); }
.status-neutral::before { background: var(--c-text-tertiary); }
.status-info { background: var(--c-info-a08); color: var(--c-info); border: 1px solid var(--c-info-a15); }
.status-info::before { background: var(--c-info); box-shadow: 0 0 6px var(--c-info-a40); }

/* =========================================
    MARK: 13. MODAL / DIALOG
    ========================================= */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: var(--c-overlay);
    backdrop-filter: blur(4px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-6);
    animation: fade-in 0.2s ease;
}
@keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }

.modal {
    background: var(--c-surface);
    border-radius: var(--radius-xl);
    border: 1px solid var(--c-border);
    box-shadow: var(--shadow-xl);
    max-width: 520px;
    width: 100%;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: modal-in 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}
@keyframes modal-in {
    from { opacity: 0; transform: scale(0.96) translateY(10px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-header {
    padding: var(--space-6) var(--space-6) 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.modal-title { font-size: var(--font-size-xl); font-weight: 600; margin: 0; }
.modal-body { padding: var(--space-5) var(--space-6); overflow-y: auto; flex: 1; }
.modal-footer {
    padding: var(--space-4) var(--space-6) var(--space-6);
    display: flex;
    justify-content: flex-end;
    gap: var(--space-3);
    border-top: 1px solid var(--c-border);
}

/* Modal (no-JS fallback via :target + JS via .open) */
.modal-overlay-css {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 2000;
    background: var(--c-overlay);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    align-items: center;
    justify-content: center;
    padding: var(--space-6);
}
.modal-overlay-css:target,
html.js .modal-overlay-css.open {
    display: flex;
    animation: fade-in 0.2s ease;
}
.modal-overlay-css:target .modal,
html.js .modal-overlay-css.open .modal {
    animation: modal-in 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    z-index: 0;
    cursor: default;
}
.modal-overlay-css .modal { position: relative; z-index: 1; }

.email-pre {
    font-family: var(--font-family);
    font-size: var(--font-size-l);
    color: var(--c-accent-bright);
    background: var(--c-surface-elevated);
    border: 1px solid var(--c-border);
    border-radius: var(--radius-md);
    padding: var(--space-4) var(--space-5);
    text-align: center;
    letter-spacing: 0.02em;
    overflow-x: auto;
}

/* =========================================
    MARK: 14. TABS (CSS-only :target + JS enhancement)
    ========================================= */
.tabs-radio { display: flex; flex-direction: column; }

.tabs-nav {
    display: flex;
    flex-wrap: nowrap;
    align-items: stretch;
    overflow-x: auto;
    overflow-y: hidden;
    border-bottom: 1px solid var(--c-border);
    scrollbar-width: thin;
    scrollbar-color: var(--c-text-tertiary) transparent;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior-x: contain;
}
.tabs-nav::-webkit-scrollbar { height: 3px; }
.tabs-nav::-webkit-scrollbar-track { background: transparent; }
.tabs-nav::-webkit-scrollbar-thumb { background: var(--c-text-tertiary); border-radius: 2px; }
.tabs-nav::-webkit-scrollbar-thumb:hover { background: var(--c-text-secondary); }

.tab-link {
    flex: 0 0 auto;
    position: relative;
    display: inline-flex;
    align-items: center;
    padding: var(--space-3) var(--space-5);
    font-family: var(--font-family);
    font-size: var(--font-size-s);
    font-weight: 500;
    letter-spacing: -0.01em;
    line-height: 1.4;
    color: var(--c-text-secondary);
    white-space: nowrap;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}
.tab-link:hover {
    color: var(--c-text-main);
    background: var(--c-white-a02);
}
.tab-link:focus-visible {
    color: var(--c-text-main);
    border-bottom-color: var(--c-accent);
    background: var(--c-accent-a04);
    outline: none;
}

/* Panels: hidden by default */
.tabs-radio > .tab-content {
    display: none;
    padding: var(--space-6) 0;
    color: var(--c-text-secondary);
    font-size: var(--font-size-s);
    line-height: 1.7;
    scroll-margin-top: var(--scroll-padding-top);
}

/* No-JS fallback: :target shows, first panel shows when nothing targeted */
html:not(.js) .tabs-radio > .tab-content:target {
    display: block;
    animation: fade-in-up 0.4s cubic-bezier(0.22, 1, 0.36, 1) both;
}
html:not(.js) .tabs-radio:not(:has(.tab-content:target)) > .tab-content:nth-of-type(2) {
    display: block;
}

/* JS mode: .active shows */
html.js .tabs-radio > .tab-content.active {
    display: block;
    animation: fade-in-up 0.4s cubic-bezier(0.22, 1, 0.36, 1) both;
}

/* Active tab-link: JS mode */
html.js .tab-link.active {
    color: var(--c-accent);
    border-bottom-color: var(--c-accent);
    background: var(--c-accent-a04);
}

/* Active tab-link: no-JS mode */
html:not(.js) .tabs-radio:has(#work-panel-1:target) .tab-link[href="#work-panel-1"],
html:not(.js) .tabs-radio:has(#work-panel-2:target) .tab-link[href="#work-panel-2"],
html:not(.js) .tabs-radio:has(#work-panel-3:target) .tab-link[href="#work-panel-3"],
html:not(.js) .tabs-radio:has(#work-panel-4:target) .tab-link[href="#work-panel-4"],
html:not(.js) .tabs-radio:has(#work-panel-5:target) .tab-link[href="#work-panel-5"],
html:not(.js) .tabs-radio:not(:has(.tab-content:target)) .tab-link[href="#work-panel-1"] {
    color: var(--c-accent);
    border-bottom-color: var(--c-accent);
    background: var(--c-accent-a04);
}

/* =========================================
    MARK: 18. TERMINAL
    ========================================= */
.terminal {
    background: var(--c-surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--c-border);
    overflow: hidden;
    font-family: var(--font-family);
    font-size: var(--font-size-s);
    line-height: 1.6;
}
.terminal-header {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    background: var(--c-white-a02);
    border-bottom: 1px solid var(--c-border);
}
.terminal-dot { width: 10px; height: 10px; border-radius: 50%; }
.terminal-dot-red { background: var(--c-error); }
.terminal-dot-yellow { background: var(--c-warning); }
.terminal-dot-green { background: var(--c-success); }
.terminal-title {
    font-size: var(--font-size-xs);
    color: var(--c-text-tertiary);
    margin-left: var(--space-2);
    letter-spacing: 0.02em;
}
.terminal-body {
    padding: var(--space-5);
    color: var(--c-text-secondary);
    overflow-x: auto;
}
.terminal-line {
    display: flex;
    align-items: baseline;
    gap: var(--space-3);
    margin-bottom: var(--space-2);
}
.terminal-line:last-child { margin-bottom: 0; }
.terminal-prompt { color: var(--c-accent); font-weight: 600; flex-shrink: 0; }
.terminal-output { color: var(--c-text-secondary); }
.terminal-cursor {
    display: inline-block;
    width: 7px;
    height: 1em;
    background: var(--c-accent);
    align-self: center;
    margin-left: -2px;
    animation: blink 1s step-end infinite;
}

/* =========================================
    MARK: 19. FOOTER
    ========================================= */
footer {
    background-color: var(--c-surface);
    padding: var(--space-20) 0 var(--space-10);
    border-top: 1px solid var(--c-border);
    font-size: var(--font-size-xs);
    color: var(--c-text-tertiary);
    letter-spacing: 0.01em;
}
.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: var(--space-12);
    margin-bottom: var(--space-12);
}
.footer-col h5 {
    font-size: var(--font-size-xs);
    color: var(--c-text-secondary);
    margin-bottom: var(--space-4);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 600;
}
.footer-col li { margin-bottom: var(--space-3); }
.footer-col a {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    transition: color 0.2s;
}
.footer-col a::before {
    content: ">";
    color: var(--c-accent);
    opacity: 0;
    transition: opacity 0.2s, transform 0.2s;
    transform: translateX(-4px);
}
.footer-col a:hover { color: var(--c-text-main); }
.footer-col a:hover::before { opacity: 1; transform: translateX(0); }

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--space-6);
    border-top: 1px solid var(--c-border);
    flex-wrap: wrap;
    gap: var(--space-4);
}
.footer-copy { color: var(--c-text-ghost); }

/* =========================================
    MARK: 20. ANIMATIONS
    ========================================= */
@keyframes fade-in-up {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes pulse-glow {
    0%, 100% { box-shadow: 0 0 20px var(--c-accent-glow); }
    50% { box-shadow: 0 0 40px var(--c-accent-glow-strong); }
}

.animate-pulse-glow { animation: pulse-glow 2s ease-in-out infinite; }
.hover-lift { transition: var(--transition-smooth); }
.hover-lift:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.glow { box-shadow: 0 0 30px var(--c-accent-glow); }
.glow-strong { box-shadow: 0 0 50px var(--c-accent-glow-strong); }

/* =========================================
   MARK: 21. HERO
   ========================================= */
.page {
    min-height: 100dvh;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-6);
    border-radius: var(--radius-2xl);
}

.pt-grad-1 { background: var(--grad-hero-1); }
.pt-grad-2 { background: var(--grad-hero-2); background-color: var(--c-bg); }

.card-fullscreen {
    width: 100%;
    max-width: 100%;
    min-height: 95dvh;
    min-height: 95vh;
}

.hero {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    gap: var(--space-5);
    padding: var(--space-10) var(--space-6);
    border-radius: var(--radius-3xl);
    border: none;
}
.hero:hover { transform: none; box-shadow: var(--shadow-sm); }
.hero:hover::before { opacity: 0; }

.hero-badges {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    justify-content: center;
    margin-bottom: var(--space-2);
}

.hero-title {
    font-size: var(--font-size-e5xl);
    color: var(--c-text-main-accent);
    letter-spacing: -0.1em;
    line-height: 1;
    margin: 0;
    filter:
        drop-shadow(0 0 10px var(--c-peach-solid))
        drop-shadow(0 0 40px var(--c-peach-solid));
    will-change: filter;
}

.hero-tagline {
    color: var(--c-hero-tagline);
    font-size: var(--font-size-5xl);
    font-weight: 500;
    letter-spacing: -0.05em;
    line-height: 1.1;
    margin: 0;
}
.hero-desc {
    max-width: 500px;
    color: var(--c-hero-desc);
    font-size: var(--font-size-l);
    margin: var(--space-3) 0 0;
}
.hero-actions { margin-top: var(--space-6); }

/* =========================================
   MARK: 22. REVEAL
   ========================================= */
.reveal {
    opacity: 0;
    transform: translateY(56px);
    animation: reveal-in 1s cubic-bezier(.22, 1, .36, 1) forwards;
    animation-timeline: view();
    animation-range: entry 10% cover 100%;
}
@keyframes reveal-in {
    from { opacity: 0; transform: translateY(56px); }
    to { opacity: 1; transform: none; }
}
.reveal-delay-1 { animation-range: entry 20% cover 40%; }
.reveal-delay-2 { animation-range: entry 30% cover 50%; }
.reveal-delay-3 { animation-range: entry 40% cover 60%; }

@supports not (animation-timeline: view()) {
    .reveal { opacity: 1; transform: none; animation: none; }
}

/* =========================================
    MARK: 24. RESPONSIVE
    ========================================= */
@media (max-width: 900px) {
    :root {
        --section-spacing: 80px;
        --font-size-e5xl: 7rem;
        --font-size-5xl: 2.75rem;
        --font-size-4xl: 2rem;
        --font-size-3xl: 1.625rem;
    }

    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }

    h1:not(.hero-title)::before,
    h2::before,
    h3:not(.card-title):not(.modal-title):not(.flex-center)::before,
    h3:not(.card-title):not(.modal-title):not(.flex-center)::after { display: none; }

    .navbar {
        top: 0;
        left: 0;
        right: 0;
        margin: 0;
        width: 100%;
        max-width: 100%;
        border-radius: 0;
        border-top: none;
        border-left: none;
        border-right: none;
        border-bottom: 1px solid var(--c-border);
        background: var(--c-navbar-bg-mobile);
        backdrop-filter: blur(14px) saturate(140%);
        -webkit-backdrop-filter: blur(14px) saturate(140%);
        padding: 0 var(--space-3);
        box-shadow: none;
    }
    .nav-content { padding: 0 var(--space-2); gap: var(--space-3); }
    .nav-toggle { display: flex; }

    .nav-links {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        background: var(--c-navbar-menu-bg);
        backdrop-filter: blur(20px) saturate(140%);
        -webkit-backdrop-filter: blur(20px) saturate(140%);
        border-bottom: 1px solid var(--c-border);
        padding: 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.4s cubic-bezier(0.22, 1, 0.36, 1),
                    padding 0.3s ease;
    }
    .nav-toggle-input:checked ~ .nav-links {
        max-height: 400px;
        padding: var(--space-3) 0;
    }
    .nav-links li { width: 100%; }
    .nav-link {
        display: block;
        padding: var(--space-4) var(--space-6);
        font-size: var(--font-size-s);
        border-bottom: 1px solid var(--c-border);
        color: var(--c-text-main);
    }
    .nav-link::after { display: none; }
    .nav-links li:last-child .nav-link { border-bottom: none; }

    body { padding-top: var(--navbar-height); }

    .page {
        min-height: calc(100dvh - var(--navbar-height));
        min-height: calc(100vh  - var(--navbar-height));
        padding: var(--space-3);
    }

    .card-fullscreen {
        min-height: calc(100dvh - var(--navbar-height) - var(--space-3) * 2);
        min-height: calc(100vh  - var(--navbar-height) - var(--space-3) * 2);
    }

    .modal { margin: var(--space-4); max-height: calc(100vh - var(--space-8)); }
    .footer-grid { grid-template-columns: repeat(2, 1fr); gap: var(--space-8); }
    .footer-bottom { flex-direction: column; text-align: center; }
    .page { border-radius: var(--radius-lg); padding: var(--space-4); }
}

@media (max-width: 640px) {
    .tab-link { padding: var(--space-3) var(--space-4); font-size: var(--font-size-xs); }
    .tabs-radio > .tab-content { padding: var(--space-5) 0; }
    .hero-tagline { font-size: var(--font-size-3xl); }
}

@media (max-width: 480px) {
    :root {
        --font-size-e5xl: 3rem;
        --font-size-4xl: 1.75rem;
        --font-size-3xl: 1.5rem;
    }
    .container, .container-wide { padding: 0 var(--space-4); }
    .footer-grid { grid-template-columns: 1fr; }
    .btn-group {
        flex-direction: column;
        width: 100%;
        align-items: stretch;
    }
    .btn-group .btn { border-radius: var(--radius-md) !important; }
}

/* =========================================
    MARK: 25. SCROLLBAR & SELECTION
    ========================================= */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--c-bg); }
::-webkit-scrollbar-thumb { background: var(--c-text-tertiary); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--c-text-secondary); }

::selection { background: var(--c-selection-bg); color: var(--c-selection-text); }

/* =========================================
    MARK: 26. MOTION PREFERENCES (a11y)
   ========================================= */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    .reveal { opacity: 1; transform: none; animation: none; }
    .logo::after,
    .terminal-cursor,
    .animate-pulse-glow { animation: none; }
}

/* =========================================
    MARK: 27. PRINT
   ========================================= */
@media print {
    :root {
        --c-bg: #ffffff;
        --c-surface: #f5f5f5;
        --c-text-main: #000000;
        --c-text-secondary: #333333;
        --c-accent: #ff5e3a;
        --c-border: #cccccc;
    }
    .navbar,
    .nav-toggle,
    .modal-overlay,
    .modal-overlay-css,
    .skip-link { display: none !important; }

    body { background: var(--c-bg); color: var(--c-text-main); padding-top: 0 !important; }
    .card, .terminal { border: 1px solid var(--c-border); box-shadow: none; }
    .hero { background: var(--c-bg) !important; }
    .hero-title { color: var(--c-text-main) !important; filter: none !important; }
}

/* =========================================
   MARK: 28. GLASS LAYER
   ========================================= */
/* Base glass: frosted, luminous, layered.
   Compose with any element (add border-radius via utilities). */
.glass {
    background:
        /* top-edge sheen — simulates light catching the surface */
        radial-gradient(140% 100% at 0% 0%,
            var(--glass-sheen) 0%,
            var(--glass-sheen-mid) 38%,
            transparent 72%),
        /* vertical body gradient — soft light falloff */
        linear-gradient(180deg,
            var(--glass-body) 0%,
            var(--glass-body-end) 100%),
        /* frosted base */
        var(--glass-bg);
    -webkit-backdrop-filter: var(--glass-blur);
    backdrop-filter: var(--glass-blur);
    border: 0px solid var(--glass-border);
    box-shadow:
        var(--glass-shadow),
        /* crisp top rim */
        inset 0 1px 0 var(--glass-highlight),
        /* soft bottom rim */
        inset 0 -1px 0 var(--glass-bottom-rim),
        /* whisper-thin inner ring — glass density */
        inset 0 0 0 1px var(--glass-inner-ring),
        /* warm inner bloom — theme continuity */
        inset 0 0 60px var(--glass-warm-bloom);
    transition: var(--transition-smooth);
}

/* Heavier variant: dialogs, modals, command palettes, sticky headers. */
.glass-strong {
    background:
        radial-gradient(140% 100% at 0% 0%,
            var(--glass-sheen-strong) 0%,
            var(--glass-sheen-strong-mid) 38%,
            transparent 72%),
        linear-gradient(180deg,
            var(--glass-body-strong) 0%,
            var(--glass-body-strong-end) 100%),
        var(--glass-bg-strong);
    -webkit-backdrop-filter: var(--glass-blur-strong);
    backdrop-filter: var(--glass-blur-strong);
    border: 1px solid var(--glass-border-hover);
    box-shadow:
        var(--glass-shadow-strong),
        inset 0 1px 0 var(--glass-highlight-strong),
        inset 0 -1px 0 var(--glass-bottom-rim-strong),
        inset 0 0 80px var(--glass-warm-bloom-strong);
    transition: var(--transition-smooth);
}

/* Lightest variant: overlays, badges, floating HUD, footers. */
.glass-subtle {
    background:
        linear-gradient(180deg,
            var(--glass-body-subtle) 0%,
            var(--glass-body-subtle-end) 100%),
        var(--glass-bg-subtle);
    -webkit-backdrop-filter: var(--glass-blur-subtle);
    backdrop-filter: var(--glass-blur-subtle);
    border: 1px solid var(--glass-border-subtle);
    box-shadow:
        var(--glass-shadow-subtle),
        inset 0 1px 0 var(--glass-sheen);
    transition: var(--transition-smooth);
}

/* Composable card: combine with `.card` for a glass-morphism card. */
.glass-card {
    background:
        radial-gradient(140% 100% at 0% 0%,
            var(--glass-sheen-card) 0%,
            var(--glass-sheen-card-mid) 38%,
            transparent 72%),
        linear-gradient(180deg,
            var(--glass-body-card) 0%,
            var(--glass-body-card-end) 100%),
        var(--glass-bg);
    -webkit-backdrop-filter: var(--glass-blur);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    box-shadow:
        var(--glass-shadow),
        inset 0 1px 0 var(--glass-highlight),
        inset 0 -1px 0 var(--glass-bottom-rim);
    transition: var(--transition-smooth);
}
.glass-card:hover {
    border-color: var(--glass-border-hover);
    box-shadow:
        var(--glass-shadow-card-hover),
        inset 0 1px 0 var(--glass-highlight-strong),
        inset 0 -1px 0 var(--glass-bottom-rim-card-hover),
        0 0 0 1px var(--glass-hover-ring);
}

/* Interactive glass: hover/focus feedback for tiles, buttons, rows. */
.glass-interactive {
    cursor: pointer;
    transition: var(--transition-smooth);
}
.glass-interactive:hover {
    border-color: var(--glass-border-hover);
    background:
        radial-gradient(140% 100% at 0% 0%,
            var(--glass-sheen-hover) 0%,
            var(--glass-sheen-hover-mid) 38%,
            transparent 72%),
        linear-gradient(180deg,
            var(--glass-body-hover) 0%,
            var(--glass-body-hover-end) 100%),
        var(--glass-bg);
    transform: translateY(-1px);
}
.glass-interactive:focus-visible {
    outline: none;
    border-color: var(--c-accent);
    box-shadow:
        var(--glass-shadow),
        inset 0 1px 0 var(--glass-highlight),
        0 0 0 3px var(--glass-accent-focus);
}

/* Glass accent: a coral-tinted glass for CTAs and highlighted panels. */
.glass-accent {
    background:
        radial-gradient(140% 100% at 0% 0%,
            var(--c-peach-a18) 0%,
            var(--glass-accent-sheen-mid) 40%,
            transparent 72%),
        linear-gradient(180deg,
            var(--glass-accent-body) 0%,
            var(--glass-accent-body-end) 100%),
        var(--glass-accent-bg);
    -webkit-backdrop-filter: var(--glass-blur);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-accent-border);
    box-shadow:
        var(--glass-shadow),
        inset 0 1px 0 var(--glass-accent-highlight),
        inset 0 -1px 0 var(--glass-bottom-rim-card-hover),
        0 0 40px var(--glass-accent-glow);
    transition: var(--transition-smooth);
}

/* Graceful fallback for browsers without backdrop-filter support. */
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
    .glass,
    .glass-card,
    .glass-interactive {
        background: var(--c-surface);
        border-color: var(--c-border);
        box-shadow: var(--shadow-md);
    }
    .glass-strong {
        background: var(--c-surface-elevated);
        border-color: var(--c-border);
        box-shadow: var(--shadow-lg);
    }
    .glass-subtle {
        background: var(--c-surface);
        border-color: var(--c-border);
    }
    .glass-accent {
        background: var(--grad-accent-fallback);
        border-color: var(--glass-accent-fallback-border);
    }
}