/* ============================================
   domain — Glacial Glassmorphism Portfolio
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
    /* Primary Colors (from DESIGN.md) */
    --fjord-midnight: #1B3A4B;
    --glacier-teal: #2E6075;
    --glacier-white: #E8F4F8;
    --alpine-gold: #D4A03C;
    --morning-haze: #F0D78C;
    --abyss: #0F2634;
    --deep-water: #2C4F5E;
    --mist: #C5D8E0;

    /* Glassmorphic Surfaces */
    --glass-bg: rgba(255, 255, 255, 0.06);
    --glass-bg-hover: rgba(255, 255, 255, 0.12);
    --glass-border: rgba(255, 255, 255, 0.15);
    --glass-border-hover: rgba(255, 255, 255, 0.28);
    --glass-border-active: rgba(212, 160, 60, 0.4);
    --glass-highlight: rgba(255, 255, 255, 0.08);
    --glass-shadow: rgba(0, 0, 0, 0.12);
    --glass-glow: rgba(212, 160, 60, 0.08);

    /* Typography */
    --font-display: 'Space Grotesk', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    /* Spacing */
    --grid-gap: 16px;
    --outer-margin: 48px;

    /* Easings */
    --ease-out-quad: cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(0.95rem, 1.1vw, 1.1rem);
    line-height: 1.65;
    color: var(--mist);
    background: var(--abyss);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* --- SVG Filters (hidden) --- */
.svg-filters {
    position: absolute;
    width: 0;
    height: 0;
    overflow: hidden;
}

/* --- Mountain Backdrop --- */
#mountain-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    z-index: 0;
    overflow: hidden;
}

.mountain-silhouette {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        /* Sharp mountain peaks via polygon gradients */
        linear-gradient(165deg, transparent 40%, #1a3545 40.5%, #1a3545 41%, transparent 41.5%),
        linear-gradient(195deg, transparent 35%, #1e3e50 35.5%, #1e3e50 36%, transparent 36.5%),
        linear-gradient(170deg, transparent 45%, #16303f 45.5%, #16303f 46.5%, transparent 47%),
        linear-gradient(185deg, transparent 42%, #1a3848 42.5%, #1a3848 43.5%, transparent 44%),
        linear-gradient(175deg, transparent 50%, #14293a 50.5%, #14293a 52%, transparent 52.5%),
        /* Sky gradient */
        linear-gradient(180deg,
            #2a5a72 0%,
            #1e4558 20%,
            #1B3A4B 40%,
            #162f3f 60%,
            #0F2634 100%
        );
    filter: grayscale(100%);
}

/* Mountain peak shapes using pseudo-elements */
.mountain-silhouette::before {
    content: '';
    position: absolute;
    bottom: 15%;
    left: 0;
    width: 100%;
    height: 60%;
    background:
        /* Peak 1 - tall sharp left */
        linear-gradient(160deg, transparent 48%, #0d2230 48.2%) no-repeat 5% 0 / 30% 100%,
        /* Peak 2 - tallest center-left */
        linear-gradient(170deg, transparent 35%, #0f2634 35.2%) no-repeat 20% 0 / 25% 100%,
        /* Peak 3 - medium center */
        linear-gradient(175deg, transparent 42%, #112838 42.3%) no-repeat 40% 0 / 20% 100%,
        /* Peak 4 - tall center-right */
        linear-gradient(168deg, transparent 38%, #0e2432 38.2%) no-repeat 55% 0 / 25% 100%,
        /* Peak 5 - medium right */
        linear-gradient(172deg, transparent 45%, #102636 45.3%) no-repeat 75% 0 / 20% 100%;
}

.mountain-silhouette::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 30%;
    background: linear-gradient(180deg, transparent, #0F2634 80%);
}

/* Duotone overlays: mix-blend-mode multiply (cyan) + screen (gold) */
.duotone-overlay-cyan {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(27, 58, 75, 0.7);
    mix-blend-mode: multiply;
    transition: opacity 0.5s ease;
}

.duotone-overlay-gold {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(212, 160, 60, 0.15);
    mix-blend-mode: screen;
    transition: opacity 0.5s ease;
}

/* --- Floating Bubbles --- */
#bubbles-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    z-index: 1;
    pointer-events: none;
    overflow: hidden;
}

.bubble {
    position: absolute;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.12);
    background: radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.15), transparent 70%);
    pointer-events: none;
    will-change: transform, opacity;
}

@keyframes bubble-rise {
    0% {
        transform: translateY(0) translateX(0);
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    90% {
        opacity: 1;
    }
    100% {
        transform: translateY(-110vh) translateX(var(--drift-x, 30px));
        opacity: 0;
    }
}

/* --- Navigation --- */
#main-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    background: rgba(15, 38, 52, 0.4);
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1400px;
    margin: 0 auto;
    padding: 16px var(--outer-margin);
}

.nav-logo {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--glacier-white);
    text-decoration: none;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-link {
    font-family: var(--font-display);
    font-weight: 500;
    font-size: 14px;
    color: var(--mist);
    text-decoration: none;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--alpine-gold);
    transition: width 0.3s var(--ease-out-quad);
}

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

.nav-link:hover::after {
    width: 100%;
}

.nav-trigger {
    display: none;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 20px;
    padding: 8px 14px;
    cursor: pointer;
    gap: 4px;
    align-items: center;
}

.nav-trigger-dot {
    display: block;
    width: 4px;
    height: 4px;
    background: var(--glacier-white);
    border-radius: 50%;
}

/* --- Hero Section --- */
.section-surface {
    position: relative;
    z-index: 2;
    height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.hero-glass-panel {
    background: rgba(255, 255, 255, 0.06);
    backdrop-filter: blur(24px) saturate(150%);
    -webkit-backdrop-filter: blur(24px) saturate(150%);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 24px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12), inset 0 1px 0 rgba(255, 255, 255, 0.08);
    padding: 60px 80px;
    text-align: center;
    max-width: 800px;
    width: 90%;
    transform: translateY(80px);
    opacity: 0;
    animation: hero-slide-in 1.2s var(--ease-spring) 0.3s forwards;
}

@keyframes hero-slide-in {
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.hero-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(2.4rem, 6vw, 5rem);
    letter-spacing: -0.02em;
    color: var(--glacier-white);
    margin-bottom: 16px;
    line-height: 1.1;
}

.hero-descriptor {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(0.95rem, 1.1vw, 1.1rem);
    color: var(--mist);
    max-width: 65ch;
    margin: 0 auto;
    line-height: 1.65;
}

.hero-scroll-indicator {
    position: absolute;
    bottom: 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    opacity: 0;
    animation: fade-in 1s ease 1.8s forwards;
}

@keyframes fade-in {
    to { opacity: 1; }
}

.scroll-text {
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 0.75rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: rgba(200, 220, 230, 0.6);
}

.scroll-arrow {
    width: 1px;
    height: 32px;
    background: linear-gradient(180deg, rgba(200, 220, 230, 0.4), transparent);
    animation: scroll-pulse 2s ease-in-out infinite;
}

@keyframes scroll-pulse {
    0%, 100% { opacity: 0.4; transform: scaleY(1); }
    50% { opacity: 1; transform: scaleY(1.3); }
}

/* --- Section Labels --- */
.section-label {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 32px;
    padding: 0 var(--outer-margin);
}

.label-tag {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(1.4rem, 3vw, 2rem);
    color: var(--glacier-white);
    letter-spacing: -0.02em;
}

.label-depth {
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 0.75rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: rgba(200, 220, 230, 0.6);
}

/* --- Bubble Dividers --- */
.bubble-divider {
    position: relative;
    z-index: 2;
    width: 100%;
    padding: 20px 0;
    display: flex;
    justify-content: center;
}

.bubble-divider svg {
    width: 80%;
    max-width: 800px;
    height: auto;
    opacity: 0.8;
}

.bubble-divider-inline {
    padding: 12px 0;
}

.bubble-divider-inline svg {
    width: 60%;
    max-width: 600px;
    opacity: 0.5;
}

/* --- Portfolio Grid (Shallows) --- */
.section-shallows {
    position: relative;
    z-index: 2;
    padding: 80px 0 40px;
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: var(--grid-gap);
    padding: 0 var(--outer-margin);
    max-width: 1400px;
    margin: 0 auto;
}

/* --- Thermocline Grid --- */
.section-thermocline {
    position: relative;
    z-index: 2;
    padding: 40px 0;
}

.thermocline-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 12px;
    padding: 0 var(--outer-margin);
    max-width: 1400px;
    margin: 0 auto;
}

/* --- Deep Water Grid --- */
.section-deep-water {
    position: relative;
    z-index: 2;
    padding: 40px 0 0;
}

.deep-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 8px;
    padding: 0 var(--outer-margin);
    max-width: 1400px;
    margin: 0 auto;
    margin-bottom: 80px;
}

/* --- Glassmorphic Cards --- */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(12px) saturate(150%);
    -webkit-backdrop-filter: blur(12px) saturate(150%);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    box-shadow: 0 8px 32px var(--glass-shadow), inset 0 1px 0 var(--glass-highlight);
    transition: all 0.4s var(--ease-out-quad);
    position: relative;
    overflow: hidden;
}

.glass-card:hover {
    background: var(--glass-bg-hover);
    border-color: var(--glass-border-hover);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2), inset 0 1px 0 var(--glass-highlight);
}

.glass-card:active {
    border-color: var(--glass-border-active);
    box-shadow: 0 8px 32px var(--glass-shadow), inset 0 0 20px var(--glass-glow);
}

/* Bubble particles on hover via CSS pseudo-elements */
.glass-card::before,
.glass-card::after {
    content: '';
    position: absolute;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.3), transparent 70%);
    border: 1px solid rgba(255, 255, 255, 0.15);
    opacity: 0;
    pointer-events: none;
}

.glass-card::before {
    top: -8px;
    left: 30%;
}

.glass-card::after {
    top: -12px;
    right: 25%;
    width: 4px;
    height: 4px;
}

.glass-card:hover::before {
    animation: bubble-particle-1 1.5s ease-out forwards;
}

.glass-card:hover::after {
    animation: bubble-particle-2 1.5s ease-out 0.2s forwards;
}

@keyframes bubble-particle-1 {
    0% { opacity: 0; transform: translateY(0); }
    20% { opacity: 1; }
    100% { opacity: 0; transform: translateY(-40px) translateX(10px); }
}

@keyframes bubble-particle-2 {
    0% { opacity: 0; transform: translateY(0); }
    20% { opacity: 1; }
    100% { opacity: 0; transform: translateY(-35px) translateX(-8px); }
}

/* --- Card Inner --- */
.card-inner {
    padding: 32px;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.card-tag {
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 0.75rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: rgba(200, 220, 230, 0.6);
    margin-bottom: 16px;
}

.card-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(1.4rem, 2.5vw, 1.8rem);
    letter-spacing: -0.02em;
    color: var(--glacier-white);
    margin-bottom: 12px;
    line-height: 1.2;
}

.card-title-sm {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(1rem, 1.8vw, 1.3rem);
    letter-spacing: -0.02em;
    color: var(--glacier-white);
    margin-bottom: 8px;
    line-height: 1.25;
}

.card-text {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(0.9rem, 1vw, 1rem);
    color: var(--mist);
    line-height: 1.65;
    max-width: 65ch;
    flex: 1;
}

.card-text-sm {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(0.85rem, 0.95vw, 0.95rem);
    color: var(--mist);
    line-height: 1.6;
    flex: 1;
}

.card-meta {
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 0.75rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: rgba(200, 220, 230, 0.6);
    margin-top: 16px;
}

/* Card size variants */
.card-large .card-inner {
    padding: 40px;
}

.card-small .card-inner {
    padding: 24px;
}

.card-tiny .card-inner {
    padding: 20px;
}

/* --- Slide-Reveal Animations --- */
[data-reveal] {
    opacity: 0;
    transition: opacity 0.8s var(--ease-out-quad), transform 0.8s var(--ease-out-quad);
}

[data-reveal="bottom"] {
    transform: translateY(60px);
}

[data-reveal="left"] {
    transform: translateX(-60px);
}

[data-reveal="right"] {
    transform: translateX(60px);
}

[data-reveal].revealed {
    opacity: 1;
    transform: translateY(0) translateX(0);
}

/* Thermocline cards: shorter travel (30px per spec) */
.section-thermocline [data-reveal="bottom"] {
    transform: translateY(30px);
}

.section-thermocline [data-reveal="left"] {
    transform: translateX(-30px);
}

.section-thermocline [data-reveal="right"] {
    transform: translateX(30px);
}

.section-thermocline [data-reveal] {
    transition-duration: 0.6s;
}

/* Deep water cards: tightest travel (20px) */
.section-deep-water [data-reveal="bottom"] {
    transform: translateY(20px);
}

.section-deep-water [data-reveal] {
    transition-duration: 0.5s;
}

/* --- Closing Bubble --- */
.closing-bubble {
    position: relative;
    z-index: 2;
    width: 0;
    height: 0;
    margin: 60px auto;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.04);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: width 0.8s var(--ease-out-quad), height 0.8s var(--ease-out-quad);
}

.closing-bubble.expanded {
    width: min(90vw, 600px);
    height: min(90vw, 600px);
}

/* --- Footer --- */
.footer-panel {
    position: relative;
    z-index: 3;
    margin: 0 var(--outer-margin) 0;
    border-radius: 16px 16px 0 0;
}

.footer-inner {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    padding: 48px;
}

.footer-col {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.footer-label {
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 0.75rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: rgba(200, 220, 230, 0.6);
    margin-bottom: 8px;
}

.footer-text {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: 0.9rem;
    color: var(--mist);
    line-height: 1.5;
}

.footer-bottom {
    padding: 24px 48px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-copyright {
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 0.75rem;
    letter-spacing: 0.06em;
    color: rgba(200, 220, 230, 0.4);
}

/* --- Responsive: Tablet --- */
@media (max-width: 1024px) {
    :root {
        --grid-gap: 12px;
        --outer-margin: 32px;
    }

    .portfolio-grid,
    .thermocline-grid {
        grid-template-columns: repeat(8, 1fr);
    }

    .card-large {
        grid-column: span 4 !important;
    }

    .card-medium {
        grid-column: span 4 !important;
    }

    .card-small {
        grid-column: span 4 !important;
    }

    .deep-grid {
        grid-template-columns: repeat(8, 1fr);
    }

    .card-tiny {
        grid-column: span 4 !important;
    }

    .footer-inner {
        grid-template-columns: repeat(2, 1fr);
        padding: 32px;
    }

    .footer-bottom {
        padding: 20px 32px;
    }
}

/* --- Responsive: Mobile --- */
@media (max-width: 768px) {
    :root {
        --grid-gap: 8px;
        --outer-margin: 16px;
    }

    .portfolio-grid,
    .thermocline-grid,
    .deep-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .card-large,
    .card-medium {
        grid-column: span 4 !important;
        grid-row: span 1 !important;
    }

    .card-small {
        grid-column: span 4 !important;
    }

    .card-tiny {
        grid-column: span 2 !important;
    }

    /* Navigation mobile: slide-reveal from right edge */
    .nav-links {
        position: fixed;
        top: 0;
        right: -280px;
        width: 280px;
        height: 100vh;
        flex-direction: column;
        background: rgba(15, 38, 52, 0.95);
        backdrop-filter: blur(24px);
        -webkit-backdrop-filter: blur(24px);
        padding: 80px 32px 32px;
        gap: 24px;
        transition: right 0.4s var(--ease-out-quad);
        border-left: 1px solid rgba(255, 255, 255, 0.1);
    }

    .nav-links.open {
        right: 0;
    }

    .nav-link {
        font-size: 18px;
    }

    .nav-trigger {
        display: flex;
    }

    /* Hero adjustments */
    .hero-glass-panel {
        padding: 40px 32px;
    }

    /* Footer mobile */
    .footer-inner {
        grid-template-columns: 1fr;
        gap: 24px;
        padding: 24px;
    }

    .footer-bottom {
        padding: 16px 24px;
    }

    .footer-panel {
        margin: 0 var(--outer-margin) 0;
    }
}

/* --- Refraction Effect (desktop only, no motion preference) --- */
@media (min-width: 1025px) and (prefers-reduced-motion: no-preference) {
    .section-thermocline {
        filter: url(#displacement);
    }
}

/* --- Scroll-linked depth indicator --- */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 3px;
    height: 0%;
    background: linear-gradient(
        180deg,
        var(--glacier-white) 0%,
        var(--glacier-teal) 40%,
        var(--alpine-gold) 70%,
        var(--fjord-midnight) 100%
    );
    z-index: 200;
    transition: height 0.1s linear;
}