/* ============================================================
   haru.club — Chrome Sakura Corporate
   Palette: Polished Chrome, Brushed Titanium, Liquid Mercury,
            Forge Graphite, Sakura Blush, Petal White,
            Steel Shadow, Moss Patina
   ============================================================ */

/* --- CSS Custom Properties --- */
:root {
    --polished-chrome: #e8ecf1;
    --brushed-titanium: #c5cdd8;
    --liquid-mercury: #9aa5b4;
    --forge-graphite: #1a1a1f;
    --sakura-blush: #f0c4c8;
    --petal-white: #faf5f6;
    --steel-shadow: #3a3d47;
    --moss-patina: #7a9178;

    --chrome-gradient: linear-gradient(135deg, #e8ecf1 0%, #c5cdd8 35%, #9aa5b4 65%, #c5cdd8 100%);

    --font-display: 'Cormorant Garamond', Georgia, serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'DM Mono', monospace;

    --ease-enter: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-hover: cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

html {
    scroll-behavior: smooth;
    scroll-snap-type: y proximity;
}

body {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(0.95rem, 1.1vw, 1.1rem);
    line-height: 1.7;
    color: var(--forge-graphite);
    background-color: var(--polished-chrome);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* Brushed metal base texture on body */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image: repeating-linear-gradient(
        90deg,
        transparent,
        transparent 2px,
        rgba(0,0,0,0.01) 2px,
        rgba(0,0,0,0.01) 3px
    );
    pointer-events: none;
    z-index: 0;
}

/* --- Cherry Blossom Petals --- */
#petals-container {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 1;
    overflow: hidden;
}

.petal {
    position: fixed;
    width: 12px;
    height: 12px;
    background: var(--sakura-blush);
    border-radius: 50% 0 50% 0;
    opacity: 0.35;
    pointer-events: none;
    animation-name: petalFall;
    animation-timing-function: cubic-bezier(0.16, 1, 0.3, 1);
    animation-iteration-count: infinite;
    animation-play-state: paused;
}

.petal.falling {
    animation-play-state: running;
}

@keyframes petalFall {
    0% {
        transform: translateY(-20px) translateX(0px) rotate(0deg);
        opacity: 0;
    }
    5% {
        opacity: 0.35;
    }
    50% {
        transform: translateY(55vh) translateX(40px) rotate(360deg);
    }
    95% {
        opacity: 0.35;
    }
    100% {
        transform: translateY(110vh) translateX(-20px) rotate(720deg);
        opacity: 0;
    }
}

/* Individual petal timings and positions */
.petal-1  { left: 5%;   animation-duration: 10s; animation-delay: 0s;   transform: rotate(15deg); }
.petal-2  { left: 12%;  animation-duration: 12s; animation-delay: 1.2s; transform: rotate(45deg); }
.petal-3  { left: 20%;  animation-duration: 9s;  animation-delay: 3.5s; transform: rotate(80deg); }
.petal-4  { left: 28%;  animation-duration: 14s; animation-delay: 0.8s; transform: rotate(120deg); }
.petal-5  { left: 35%;  animation-duration: 11s; animation-delay: 5.2s; transform: rotate(200deg); }
.petal-6  { left: 42%;  animation-duration: 8s;  animation-delay: 2.1s; transform: rotate(260deg); }
.petal-7  { left: 50%;  animation-duration: 13s; animation-delay: 7.4s; transform: rotate(30deg); }
.petal-8  { left: 58%;  animation-duration: 10s; animation-delay: 4.0s; transform: rotate(150deg); }
.petal-9  { left: 65%;  animation-duration: 15s; animation-delay: 1.8s; transform: rotate(310deg); }
.petal-10 { left: 72%;  animation-duration: 9s;  animation-delay: 6.5s; transform: rotate(90deg); }
.petal-11 { left: 78%;  animation-duration: 12s; animation-delay: 3.0s; transform: rotate(170deg); }
.petal-12 { left: 85%;  animation-duration: 11s; animation-delay: 8.2s; transform: rotate(240deg); }
.petal-13 { left: 92%;  animation-duration: 10s; animation-delay: 0.5s; transform: rotate(55deg); }
.petal-14 { left: 8%;   animation-duration: 14s; animation-delay: 9.3s; transform: rotate(290deg); }
.petal-15 { left: 38%;  animation-duration: 13s; animation-delay: 11.0s; transform: rotate(130deg); }
.petal-16 { left: 55%;  animation-duration: 9s;  animation-delay: 4.7s; transform: rotate(340deg); }
.petal-17 { left: 68%;  animation-duration: 12s; animation-delay: 10.5s; transform: rotate(70deg); }
.petal-18 { left: 82%;  animation-duration: 8s;  animation-delay: 6.0s; transform: rotate(190deg); }

/* Reduce petals on mobile */
@media (max-width: 768px) {
    .petal-9, .petal-10, .petal-11, .petal-12,
    .petal-13, .petal-14, .petal-15, .petal-16,
    .petal-17, .petal-18 {
        display: none;
    }
}

/* --- Navigation --- */
#main-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 56px;
    background: rgba(250, 245, 246, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 100;
    transform: translateY(-100%);
    transition: transform 500ms var(--ease-enter);
    border-bottom: 1px solid transparent;
}

#main-nav.visible {
    transform: translateY(0);
    border-bottom-color: var(--brushed-titanium);
}

.nav-inner {
    max-width: 1400px;
    margin: 0 auto;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 clamp(20px, 4vw, 60px);
}

.nav-logo {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: 1.1rem;
    color: var(--forge-graphite);
    text-decoration: none;
    letter-spacing: -0.01em;
}

.nav-links {
    display: flex;
    gap: clamp(16px, 3vw, 40px);
}

.nav-link {
    font-family: var(--font-body);
    font-weight: 500;
    font-size: 0.8rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--liquid-mercury);
    text-decoration: none;
    line-height: 1.4;
    position: relative;
    background-image: linear-gradient(var(--sakura-blush), var(--sakura-blush));
    background-size: 0% 1px;
    background-position: left bottom;
    background-repeat: no-repeat;
    transition: color 300ms var(--ease-hover), background-size 300ms var(--ease-hover);
}

.nav-link:hover {
    color: var(--forge-graphite);
    background-size: 100% 1px;
}

.nav-link.active {
    color: var(--forge-graphite);
    background-size: 100% 1px;
}

@media (max-width: 768px) {
    .nav-links {
        gap: 12px;
    }
    .nav-link {
        font-size: 0.7rem;
        letter-spacing: 0.08em;
    }
}

/* --- The Atrium (Hero Zone) --- */
.atrium {
    height: 100vh;
    display: grid;
    place-items: center;
    background: var(--forge-graphite);
    position: relative;
    perspective: 1200px;
    scroll-snap-align: start;
    z-index: 2;
    transition: background 1200ms var(--ease-enter);
}

.atrium.revealed {
    background: var(--chrome-gradient);
}

.atrium-content {
    text-align: center;
    transform: rotateX(1.5deg);
    position: relative;
    z-index: 3;
}

.atrium-title {
    font-family: var(--font-display);
    font-weight: 300;
    font-size: clamp(3rem, 8vw, 7rem);
    color: var(--forge-graphite);
    letter-spacing: -0.02em;
    line-height: 1.1;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 900ms var(--ease-enter), transform 900ms var(--ease-enter);
}

.atrium-title.visible {
    opacity: 1;
    transform: translateY(0);
}

.atrium-tagline {
    font-family: var(--font-body);
    font-weight: 300;
    font-size: clamp(0.85rem, 1.5vw, 1.1rem);
    color: var(--liquid-mercury);
    margin-top: 16px;
    opacity: 0;
    transform: translateY(15px);
    transition: opacity 900ms var(--ease-enter), transform 900ms var(--ease-enter);
}

.atrium-tagline.visible {
    opacity: 1;
    transform: translateY(0);
}

.atrium-line {
    width: 120px;
    height: 1px;
    background: var(--chrome-gradient);
    margin: 24px auto 0;
    transform: scaleX(0);
    transform-origin: center;
    transition: transform 600ms var(--ease-enter);
}

.atrium-line.visible {
    transform: scaleX(1);
}

/* --- Section Headers --- */
.section-header {
    text-align: center;
    margin-bottom: clamp(40px, 6vw, 80px);
    padding-top: clamp(60px, 8vw, 120px);
}

.section-title {
    font-family: var(--font-display);
    font-weight: 500;
    font-size: clamp(1.6rem, 3.5vw, 2.8rem);
    color: var(--forge-graphite);
    letter-spacing: 0.01em;
    line-height: 1.25;
}

.section-subtitle {
    font-family: var(--font-body);
    font-weight: 300;
    font-size: clamp(0.85rem, 1.2vw, 1rem);
    color: var(--liquid-mercury);
    margin-top: 12px;
    letter-spacing: 0.08em;
}

/* --- Gallery Wing (Card Grid) --- */
.gallery-wing {
    position: relative;
    z-index: 2;
    padding: 0 clamp(20px, 4vw, 60px);
    padding-bottom: clamp(60px, 8vw, 120px);
    max-width: 1400px;
    margin: 0 auto;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 380px), 1fr));
    gap: clamp(16px, 2.5vw, 40px);
}

/* --- Cards --- */
.card {
    background-color: var(--polished-chrome);
    background-image: repeating-linear-gradient(
        90deg,
        transparent,
        transparent 2px,
        rgba(0,0,0,0.01) 2px,
        rgba(0,0,0,0.01) 3px
    );
    border-radius: 4px;
    overflow: hidden;
    box-shadow:
        0 1px 3px rgba(0,0,0,0.08),
        0 12px 40px rgba(0,0,0,0.04);
    opacity: 0;
    transform: translateY(24px);
    transition:
        opacity 500ms var(--ease-enter),
        transform 500ms var(--ease-enter),
        box-shadow 400ms var(--ease-hover);
    transition-delay: calc(var(--stagger, 0) * 80ms);
    position: relative;
}

.card::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent 20%, var(--sakura-blush) 50%, transparent 80%);
    opacity: 0;
    transition: opacity 400ms var(--ease-hover);
}

.card.in-view {
    opacity: 1;
    transform: translateY(0);
}

.card:hover {
    box-shadow:
        0 4px 12px rgba(0,0,0,0.1),
        0 20px 60px rgba(0,0,0,0.08);
}

.card:hover::after {
    opacity: 1;
}

.card:hover .card-title {
    color: var(--steel-shadow);
}

.card:hover .card-illustration {
    filter: grayscale(0%) contrast(1.08) brightness(1.0);
}

/* Wide card spans 2 columns on large screens */
@media (min-width: 1024px) {
    .card-wide {
        grid-column: span 2;
    }
}

.card-image {
    width: 100%;
    overflow: hidden;
}

.card-illustration {
    width: 100%;
    height: auto;
    display: block;
    filter: grayscale(30%) contrast(1.05) brightness(1.02);
    transition: filter 600ms var(--ease-hover);
}

.card-body {
    padding: clamp(16px, 2vw, 28px);
}

.card-meta {
    display: block;
    font-family: var(--font-body);
    font-weight: 300;
    font-size: 0.75rem;
    letter-spacing: 0.08em;
    color: var(--liquid-mercury);
    line-height: 1.5;
    margin-bottom: 8px;
}

.mono {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.06em;
}

.card-title {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(1.1rem, 2vw, 1.5rem);
    color: var(--forge-graphite);
    line-height: 1.35;
    letter-spacing: 0;
    margin-bottom: 8px;
    transition: color 400ms var(--ease-hover);
}

.card-desc {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(0.85rem, 1vw, 0.95rem);
    color: var(--steel-shadow);
    line-height: 1.7;
}

/* --- Chrome Reflection Line --- */
.chrome-line {
    width: 60%;
    max-width: 600px;
    height: 1px;
    background: var(--chrome-gradient);
    margin: 0 auto;
}

.chrome-line-animated {
    padding: 80px 0;
    background: transparent;
    position: relative;
    z-index: 2;
}

.chrome-line-animated::after {
    content: '';
    display: block;
    width: 60%;
    max-width: 600px;
    height: 1px;
    background: var(--chrome-gradient);
    margin: 0 auto;
    transform: scaleX(0);
    transform-origin: center;
    transition: transform 800ms var(--ease-enter);
}

.chrome-line-animated.in-view::after {
    transform: scaleX(1);
}

/* --- Courtyard (Interstitial) --- */
.courtyard {
    position: relative;
    min-height: 40vh;
    display: grid;
    place-items: center;
    overflow: hidden;
    scroll-snap-align: start;
    z-index: 2;
}

.courtyard-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.courtyard-illustration {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.courtyard-overlay {
    position: absolute;
    inset: 0;
    background: rgba(232, 236, 241, 0.7);
    z-index: 1;
}

.courtyard-content {
    position: relative;
    z-index: 2;
    max-width: 700px;
    padding: clamp(40px, 6vw, 80px) clamp(20px, 4vw, 60px);
    text-align: center;
}

.courtyard-quote {
    font-family: var(--font-display);
    font-weight: 400;
    font-style: italic;
    font-size: clamp(1.4rem, 3vw, 2.4rem);
    color: var(--forge-graphite);
    line-height: 1.35;
    letter-spacing: 0.01em;
}

.courtyard-attribution {
    margin-top: 20px;
    font-size: 0.72rem;
    color: var(--liquid-mercury);
    letter-spacing: 0.06em;
}

.courtyard-alt .courtyard-overlay {
    background: rgba(232, 236, 241, 0.75);
}

/* --- The Plinth (Footer) --- */
.plinth {
    background: var(--forge-graphite);
    color: var(--polished-chrome);
    position: relative;
    z-index: 2;
    padding: clamp(60px, 8vw, 120px) clamp(20px, 4vw, 60px);
}

.plinth-inner {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
}

.plinth-brand {
    text-align: center;
}

.plinth-title {
    font-family: var(--font-display);
    font-weight: 300;
    font-size: clamp(2rem, 4vw, 3.5rem);
    color: var(--petal-white);
    letter-spacing: -0.02em;
    line-height: 1.1;
}

.plinth-tagline {
    font-family: var(--font-body);
    font-weight: 300;
    font-size: clamp(0.85rem, 1.2vw, 1rem);
    color: var(--liquid-mercury);
    margin-top: 12px;
    letter-spacing: 0.08em;
}

.plinth-details {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.plinth-text {
    font-family: var(--font-body);
    font-weight: 300;
    font-size: clamp(0.85rem, 1vw, 0.95rem);
    color: var(--liquid-mercury);
    line-height: 1.7;
}

.plinth-footer-line {
    padding: 20px 0;
}

.plinth-footer-line .chrome-line {
    opacity: 0.3;
}

.plinth-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.plinth-copy {
    font-size: 0.72rem;
    color: var(--liquid-mercury);
    letter-spacing: 0.06em;
}

.plinth-link {
    font-family: var(--font-body);
    font-weight: 300;
    font-size: 0.85rem;
}

.enter-link {
    color: var(--liquid-mercury);
    text-decoration: none;
    position: relative;
    background-image: linear-gradient(var(--sakura-blush), var(--sakura-blush));
    background-size: 0% 1px;
    background-position: left bottom;
    background-repeat: no-repeat;
    transition: color 300ms var(--ease-hover), background-size 400ms var(--ease-hover);
}

.enter-link:hover {
    color: var(--petal-white);
    background-size: 100% 1px;
}

/* --- Scroll progress indicator (optional) --- */

/* --- Responsive --- */
@media (max-width: 768px) {
    .card-wide {
        grid-column: span 1;
    }

    .plinth-bottom {
        justify-content: center;
        text-align: center;
    }

    .courtyard-quote {
        font-size: clamp(1.1rem, 5vw, 1.6rem);
    }

    .atrium-content {
        transform: none;
    }
}

@media (max-width: 480px) {
    .nav-links {
        display: none;
    }
}