/* ===================================
   Design Tokens — "Warm-black observatory"
   Adapted from .claude/DESIGN.md (Inngest style reference)
   =================================== */
:root {
    /* Colors — warm-gray surface stack */
    --color-obsidian: #0c0a09;
    --color-graphite: #1c1917;
    --color-charcoal: #292524;
    --color-slate: #44403c;
    --color-stone: #57534e;
    --color-ash: #78716c;
    --color-pebble: #a8a29e;
    --color-mist: #d6d3d1;
    --color-fog: #e5e7eb;
    --color-bone: #f6f6f6;
    --color-pure: #ffffff;

    /* Chromatic accents */
    --color-pilot-gold: #cab16a;   /* only chromatic color permitted on functional UI */
    --color-circuit-green: #89b482; /* decorative geometry only */
    --color-signal-red: #ea6962;   /* decorative geometry only */
    --color-amber-code: #d8a657;   /* inline code / mono tokens */

    /* Semantic aliases */
    --surface-canvas: var(--color-obsidian);
    --surface-card: var(--color-graphite);
    --surface-elevated: var(--color-charcoal);
    --surface-overlay: var(--color-slate);
    --border-hairline: var(--color-charcoal);
    --border-strong: var(--color-slate);
    --text-primary: var(--color-fog);
    --text-secondary: var(--color-pebble);
    --text-muted: var(--color-ash);

    /* Typography */
    --font-body: 'Inter', ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-display: 'Inter', ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

    /* Spacing (8px base) */
    --spacing-8: 8px;
    --spacing-16: 16px;
    --spacing-24: 24px;
    --spacing-32: 32px;
    --spacing-40: 40px;
    --spacing-48: 48px;
    --spacing-64: 64px;
    --spacing-80: 80px;
    --spacing-96: 96px;
    --spacing-128: 128px;

    /* Radius — pill for buttons/tags, 12px cards */
    --radius-cards: 12px;
    --radius-inputs: 4px;
    --radius-full: 9999px;

    /* Layout */
    --page-max-width: 1200px;

    /* Elevation — depth from surface stack, not blur */
    --shadow-subtle: rgba(0, 0, 0, 0.05) 0px 1px 2px 0px;
}

/* ===================================
   Reset & Base
   =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    background-color: var(--surface-canvas);
    color: var(--text-primary);
    font-size: 16px;
    font-weight: 400;
    line-height: 1.5;
    letter-spacing: -0.019em;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ===================================
   Navigation
   =================================== */
#navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(12, 10, 9, 0.85);
    backdrop-filter: blur(12px);
    z-index: 1000;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-hairline);
    box-shadow: var(--shadow-subtle);
}

.nav-container {
    max-width: var(--page-max-width);
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: 18px;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--color-pure);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 0.5rem;
}

.nav-link {
    position: relative;
    color: var(--color-mist);
    font-weight: 400;
    font-size: 14px;
    padding: 0.5rem 0.75rem;
}

.nav-link:hover {
    color: var(--color-fog);
}

.nav-link.active {
    color: var(--color-pilot-gold);
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.hamburger span {
    width: 25px;
    height: 2px;
    background: var(--color-mist);
    transition: all 0.3s ease;
}

/* ===================================
   Container & Sections
   =================================== */
.container {
    max-width: var(--page-max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

section {
    padding: var(--spacing-128) 0;
    display: block;
}

.section-title {
    font-family: var(--font-display);
    font-weight: 300;
    font-size: clamp(2rem, 5vw, 48px);
    line-height: 1.11;
    letter-spacing: -0.056em;
    text-align: center;
    color: var(--color-fog);
    margin-bottom: var(--spacing-64);
    width: 100%;
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    background-color: var(--surface-canvas);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    padding-top: 80px;
    overflow: hidden;
    z-index: 0;
}

.hero-content {
    max-width: 820px;
    margin: 0 auto;
    padding: 0 2rem;
    position: relative;
    z-index: 2;
}

.hero-title {
    font-family: var(--font-display);
    font-weight: 300;
    font-size: clamp(2.75rem, 9vw, 72px);
    line-height: 1.0;
    letter-spacing: -0.056em;
    color: var(--color-fog);
    margin-bottom: var(--spacing-24);
}

.highlight {
    color: var(--color-pilot-gold);
}

.hero-subtitle {
    font-size: 20px;
    font-weight: 400;
    color: var(--color-mist);
    letter-spacing: -0.025em;
    margin-bottom: var(--spacing-16);
}

.hero-quote {
    color: var(--text-secondary);
    font-size: 18px;
    line-height: 1.56;
    max-width: 560px;
    margin: 0 auto var(--spacing-40);
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-16);
    justify-content: center;
    margin-bottom: var(--spacing-40);
}

/* ---- Pill Buttons ---- */
.btn {
    font-family: var(--font-body);
    font-size: 15px;
    font-weight: 500;
    padding: 10px 20px;
    border-radius: var(--radius-full);
    letter-spacing: -0.019em;
    transition: all 0.2s ease;
    display: inline-block;
    border: 1px solid transparent;
    cursor: pointer;
}

/* Primary — the page's only chromatic permission */
.btn-primary {
    background: var(--color-pilot-gold);
    color: var(--color-obsidian);
}

.btn-primary:hover {
    background: #d8c184;
}

/* Ghost outline */
.btn-secondary {
    background: transparent;
    border: 1px solid var(--border-strong);
    color: var(--color-fog);
}

.btn-secondary:hover {
    border-color: var(--color-ash);
}

.social-links {
    display: flex;
    gap: var(--spacing-24);
    justify-content: center;
    margin-top: var(--spacing-32);
}

.social-links a {
    font-size: 1.25rem;
    color: var(--color-ash);
}

.social-links a:hover {
    color: var(--color-pilot-gold);
}

.scroll-down {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
    z-index: 2;
}

.scroll-down a {
    color: var(--color-ash);
    font-size: 1.25rem;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-10px); }
    60% { transform: translateX(-50%) translateY(-5px); }
}

/* ===================================
   Decorative Geometry System
   quarter-circles, right-triangles, filled squares
   in gold / green / red, partially clipped by edges
   =================================== */
.geo-layer {
    position: absolute;
    inset: 0;
    z-index: 1;
    pointer-events: none;
}

.geo {
    position: absolute;
    width: 60px;
    height: 60px;
    opacity: 0.5;
    animation: float 9s ease-in-out infinite;
}

.geo-gold  { color: var(--color-pilot-gold); }
.geo-green { color: var(--color-circuit-green); }
.geo-red   { color: var(--color-signal-red); }

/* quarter-circle */
.geo-quarter {
    width: 80px;
    height: 80px;
    background: currentColor;
    border-radius: 80px 0 0 0;
    opacity: 0.35;
}

/* right-triangle */
.geo-triangle {
    width: 0;
    height: 0;
    border-left: 40px solid transparent;
    border-bottom: 56px solid currentColor;
    opacity: 0.4;
}

/* small filled square */
.geo-square {
    width: 44px;
    height: 44px;
    background: currentColor;
    opacity: 0.4;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-12px); }
}

/* ===================================
   Skills Section — feature card grid
   =================================== */
.skills {
    background-color: var(--surface-canvas);
    position: relative;
    z-index: 1;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-24);
}

.skill-card {
    background: var(--surface-card);
    padding: var(--spacing-32);
    border-radius: var(--radius-cards);
    border: 1px solid var(--border-hairline);
    transition: border-color 0.2s ease, transform 0.2s ease;
    text-align: left;
}

.skill-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-strong);
}

.skill-icon {
    font-size: 24px;
    color: var(--color-circuit-green);
    margin-bottom: var(--spacing-16);
}

.skill-card:nth-child(even) .skill-icon {
    color: var(--color-pilot-gold);
}

.skill-card h3 {
    font-size: 20px;
    font-weight: 500;
    letter-spacing: -0.025em;
    color: var(--color-fog);
    margin-bottom: var(--spacing-8);
}

.skill-list {
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 400;
    line-height: 1.7;
}

/* ===================================
   Projects Section
   =================================== */
.projects {
    background-color: var(--surface-canvas);
}

/* ---- Featured projects (curated top row) ---- */
.featured-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-24);
    margin-bottom: var(--spacing-80);
}

.project-card.featured {
    display: flex;
    flex-direction: column;
}

.project-card.featured .project-content {
    display: flex;
    flex-direction: column;
    flex: 1;
}

/* Terminal preview panel */
.project-media {
    background: var(--surface-elevated);
    border-bottom: 1px solid var(--border-hairline);
    padding: 0;
}

.term-bar {
    display: flex;
    gap: 7px;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-hairline);
}

.term-bar span {
    width: 10px;
    height: 10px;
    border-radius: var(--radius-full);
    background: var(--color-slate);
}

.term-bar span:nth-child(1) { background: var(--color-signal-red); opacity: 0.7; }
.term-bar span:nth-child(2) { background: var(--color-pilot-gold); opacity: 0.7; }
.term-bar span:nth-child(3) { background: var(--color-circuit-green); opacity: 0.7; }

.term-body {
    font-family: var(--font-mono);
    font-size: 12px;
    line-height: 1.7;
    letter-spacing: 0;
    color: var(--color-pebble);
    padding: 16px 20px;
    margin: 0;
    white-space: pre;
    overflow-x: auto;
}

.term-body .tp    { color: var(--color-ash); }               /* prompt $ */
.term-body .tg    { color: var(--color-circuit-green); }     /* success/ok */
.term-body .tgold { color: var(--color-pilot-gold); }        /* highlight value */

/* "More Projects" secondary heading */
.more-title {
    font-family: var(--font-display);
    font-weight: 300;
    font-size: 24px;
    letter-spacing: -0.025em;
    color: var(--color-mist);
    text-align: center;
    margin-bottom: var(--spacing-32);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: var(--spacing-24);
}

.project-card {
    background: var(--surface-card);
    border-radius: var(--radius-cards);
    overflow: hidden;
    border: 1px solid var(--border-hairline);
    transition: border-color 0.2s ease, transform 0.2s ease;
}

.project-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-strong);
}

.project-content {
    padding: var(--spacing-32);
}

.project-content h3 {
    font-size: 24px;
    font-weight: 500;
    letter-spacing: -0.025em;
    color: var(--color-fog);
    margin-bottom: var(--spacing-16);
}

.project-content p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: var(--spacing-24);
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-8);
    margin-bottom: var(--spacing-24);
}

/* Ghost pill tags */
.project-tech span {
    font-family: var(--font-mono);
    padding: 4px 12px;
    background: transparent;
    border: 1px solid var(--border-hairline);
    color: var(--color-pebble);
    border-radius: var(--radius-full);
    font-size: 12px;
}

.project-links {
    display: flex;
    gap: var(--spacing-24);
}

.project-links a {
    color: var(--color-mist);
    font-size: 14px;
    font-weight: 500;
}

.project-links a:hover {
    color: var(--color-pilot-gold);
}

/* ===================================
   Contact Section
   =================================== */
.contact-content {
    text-align: center;
    max-width: 640px;
    margin: 0 auto;
}

.contact-text {
    font-size: 18px;
    color: var(--text-secondary);
    line-height: 1.56;
    margin-bottom: var(--spacing-40);
}

.contact-links {
    display: flex;
    gap: var(--spacing-16);
    justify-content: center;
    flex-wrap: wrap;
}

/* Ghost outline pills */
.contact-btn {
    padding: 10px 20px;
    background: transparent;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    gap: var(--spacing-8);
    color: var(--color-fog);
    font-size: 14px;
    font-weight: 500;
}

.contact-btn:hover {
    border-color: var(--color-ash);
    color: var(--color-pilot-gold);
}

/* ===================================
   Footer
   =================================== */
.footer {
    background-color: var(--surface-card);
    padding: var(--spacing-48) 0;
    border-top: 1px solid var(--border-hairline);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-16);
}

.footer-content p {
    color: var(--text-muted);
    font-size: 14px;
}

.footer-social {
    display: flex;
    gap: var(--spacing-16);
}

.footer-social a {
    color: var(--color-ash);
    font-size: 1.1rem;
}

.footer-social a:hover {
    color: var(--color-pilot-gold);
}

/* ===================================
   Responsive
   =================================== */
@media (max-width: 900px) {
    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .featured-grid {
        grid-template-columns: 1fr;
        margin-bottom: var(--spacing-64);
    }
}

@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 65px;
        flex-direction: column;
        background-color: var(--surface-card);
        width: 100%;
        text-align: center;
        transition: left 0.3s ease;
        border-bottom: 1px solid var(--border-hairline);
        padding: 2rem 0;
        gap: 1rem;
    }

    .nav-menu.active {
        left: 0;
    }

    .projects-grid,
    .skills-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    section {
        padding: var(--spacing-80) 0;
    }
}

@media (max-width: 480px) {
    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        width: 100%;
    }
}