/* ========================================
   LUMEN STUDIO — Lighting Designer Portfolio
   Refined editorial aesthetic
   ======================================== */

:root {
    --ink: #0d0d0e;
    --ink-soft: #1a1a1c;
    --paper: #f6f2ec;
    --paper-warm: #ede5d8;
    --cream: #faf7f2;
    --gold: #c8a86b;
    --gold-soft: #d9c39a;
    --line: rgba(13, 13, 14, 0.12);
    --line-light: rgba(255, 255, 255, 0.12);
    --text: #2a2a2c;
    --text-mute: #6e6a64;
    --text-on-dark: #d8d2c6;

    --font-serif: 'Cormorant Garamond', 'Noto Serif SC', serif;
    --font-cn: 'Noto Serif SC', 'Cormorant Garamond', serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'PingFang SC', sans-serif;

    --container: 1240px;
    --ease: cubic-bezier(0.65, 0, 0.35, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font-sans);
    color: var(--text);
    background: var(--cream);
    line-height: 1.7;
    font-weight: 300;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; transition: color .3s var(--ease); }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }

.container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 32px;
}

/* ===== Header / Nav ===== */
.site-header {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    padding: 28px 0;
    transition: all .5s var(--ease);
}
.site-header.scrolled {
    background: rgba(250, 247, 242, 0.92);
    backdrop-filter: blur(20px);
    padding: 16px 0;
    border-bottom: 1px solid var(--line);
}
.site-header.scrolled .brand,
.site-header.scrolled .nav-menu a { color: var(--ink); }

.nav-container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    color: #fff;
    transition: color .4s var(--ease);
}
.brand-mark {
    width: 38px; height: 38px;
    border: 1px solid currentColor;
    display: grid; place-items: center;
    font-family: var(--font-serif);
    font-style: normal;
    font-size: 24px;
    font-weight: 600;
    letter-spacing: 0.02em;
}
.brand-name {
    font-family: var(--font-sans);
    font-size: 15px;
    letter-spacing: 0.28em;
    font-weight: 500;
}
.brand-sub {
    display: block;
    font-family: var(--font-sans);
    font-size: 15px;
    letter-spacing: 0.28em;
    font-weight: 500;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 44px;
}
.nav-menu a {
    color: #fff;
    font-size: 13px;
    letter-spacing: 0.12em;
    position: relative;
    padding: 6px 0;
}
.nav-menu a:not(.nav-cta):hover { color: var(--gold-soft); }
.nav-menu a:not(.nav-cta)::after {
    content: '';
    position: absolute;
    left: 0; bottom: 0;
    width: 0; height: 1px;
    background: currentColor;
    transition: width .35s var(--ease);
}
.nav-menu a:not(.nav-cta):hover::after { width: 100%; }

.nav-cta {
    padding: 10px 22px !important;
    border: 1px solid currentColor;
    border-radius: 999px;
    transition: all .35s var(--ease) !important;
}
.nav-cta:hover {
    background: var(--gold);
    border-color: var(--gold);
    color: #fff !important;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
}
.nav-toggle span {
    width: 24px; height: 1.5px;
    background: #fff;
    transition: all .3s var(--ease);
}
.site-header.scrolled .nav-toggle span { background: var(--ink); }

/* ===== Hero ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    color: #fff;
}
.hero-bg {
    position: absolute; inset: 0;
    background: radial-gradient(ellipse at 70% 30%, #2a241a 0%, #100c08 50%, #050403 100%);
    z-index: 1;
}
.hero-bg::before {
    content: '';
    position: absolute;
    top: -10%; right: -10%;
    width: 70%; height: 80%;
    background: radial-gradient(circle, rgba(200, 168, 107, 0.35) 0%, transparent 60%);
    filter: blur(40px);
    animation: lightPulse 8s ease-in-out infinite;
}
.hero-bg::after {
    content: '';
    position: absolute;
    bottom: -10%; left: -5%;
    width: 50%; height: 60%;
    background: radial-gradient(circle, rgba(217, 195, 154, 0.18) 0%, transparent 70%);
    filter: blur(50px);
    animation: lightPulse 10s ease-in-out infinite reverse;
}
@keyframes lightPulse {
    0%, 100% { opacity: 0.7; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.08); }
}
.hero-overlay {
    position: absolute; inset: 0;
    background:
        linear-gradient(180deg, rgba(0,0,0,0.3) 0%, transparent 30%, transparent 70%, rgba(0,0,0,0.5) 100%),
        url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='100' height='100'%3E%3Cfilter id='n'%3E%3CfeTurbulence baseFrequency='0.9'/%3E%3C/filter%3E%3Crect width='100' height='100' filter='url(%23n)' opacity='0.05'/%3E%3C/svg%3E");
    z-index: 2;
}

.hero-content {
    position: relative;
    z-index: 3;
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 32px;
    width: 100%;
}

.hero-eyebrow {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 11px;
    letter-spacing: 0.35em;
    color: var(--gold-soft);
    margin-bottom: 36px;
    text-transform: uppercase;
}
.hero-eyebrow .line {
    width: 60px; height: 1px;
    background: var(--gold);
}

.hero-title {
    font-family: var(--font-cn);
    font-size: clamp(48px, 7vw, 96px);
    line-height: 1.1;
    font-weight: 300;
    letter-spacing: 0.02em;
    margin-bottom: 32px;
}
.hero-title em {
    font-family: var(--font-serif);
    font-style: italic;
    font-weight: 400;
    color: var(--gold-soft);
}

.hero-subtitle {
    font-size: 16px;
    line-height: 1.9;
    color: var(--text-on-dark);
    max-width: 580px;
    margin-bottom: 48px;
    font-weight: 300;
}

.hero-actions {
    display: flex;
    gap: 20px;
    margin-bottom: 80px;
    flex-wrap: wrap;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 14px;
    padding: 18px 36px;
    background: var(--gold);
    color: #fff;
    font-size: 13px;
    letter-spacing: 0.2em;
    border-radius: 999px;
    transition: all .4s var(--ease);
    border: 1px solid var(--gold);
}
.btn-primary:hover {
    background: transparent;
    color: var(--gold-soft);
    transform: translateY(-2px);
}
.btn-primary i { transition: transform .4s var(--ease); }
.btn-primary:hover i { transform: translateX(4px); }

.btn-ghost {
    display: inline-flex;
    align-items: center;
    padding: 18px 36px;
    border: 1px solid rgba(255,255,255,0.3);
    color: #fff;
    font-size: 13px;
    letter-spacing: 0.2em;
    border-radius: 999px;
    transition: all .4s var(--ease);
}
.btn-ghost:hover {
    border-color: var(--gold-soft);
    color: var(--gold-soft);
}

.hero-meta {
    display: flex;
    align-items: center;
    gap: 40px;
    padding-top: 32px;
    border-top: 1px solid rgba(255,255,255,0.1);
    max-width: 600px;
}
.hero-meta > div:not(.divider) {
    display: flex;
    flex-direction: column;
    gap: 4px;
}
.hero-meta .num {
    font-family: var(--font-serif);
    font-size: 32px;
    color: var(--gold-soft);
    font-weight: 400;
}
.hero-meta .lbl {
    font-size: 11px;
    letter-spacing: 0.2em;
    color: var(--text-on-dark);
    text-transform: uppercase;
}
.hero-meta .divider {
    width: 1px; height: 40px;
    background: rgba(255,255,255,0.15);
}

.scroll-hint {
    position: absolute;
    bottom: 32px; left: 50%;
    transform: translateX(-50%);
    z-index: 3;
    color: rgba(255,255,255,0.5);
}
.scroll-hint span {
    display: block;
    width: 1px; height: 56px;
    background: linear-gradient(to bottom, transparent, currentColor);
    animation: scrollLine 2s ease-in-out infinite;
}
@keyframes scrollLine {
    0%, 100% { opacity: 0.4; transform: scaleY(0.6); transform-origin: top; }
    50% { opacity: 1; transform: scaleY(1); }
}

/* ===== Section common ===== */
section { padding: 140px 0; position: relative; }

.section-eyebrow {
    font-size: 11px;
    letter-spacing: 0.35em;
    color: var(--gold);
    text-transform: uppercase;
    margin-bottom: 28px;
    font-weight: 500;
}
.section-eyebrow.light { color: var(--gold-soft); }

.section-title {
    font-family: var(--font-cn);
    font-size: clamp(36px, 4.5vw, 60px);
    font-weight: 300;
    line-height: 1.2;
    color: var(--ink);
    margin-bottom: 40px;
    letter-spacing: 0.01em;
}
.section-title em {
    font-family: var(--font-serif);
    font-style: italic;
    color: var(--gold);
    font-weight: 400;
}
.section-title.center { text-align: center; margin-bottom: 24px; }
.section-title.light { color: var(--cream); }
.section-title.light em { color: var(--gold-soft); }

.section-lead {
    text-align: center;
    color: var(--text-on-dark);
    font-size: 15px;
    max-width: 600px;
    margin: 0 auto 80px;
    line-height: 1.9;
}

/* ===== About ===== */
.about { background: var(--cream); }
.about-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 100px;
    align-items: center;
    margin-top: 60px;
}
.about-text .section-title {
    font-size: clamp(36px, 4.5vw, 54px);
    max-width: 540px;
}
.about-text p {
    font-size: 16px;
    line-height: 2;
    color: var(--text);
    margin-bottom: 24px;
    max-width: 540px;
}
.signature {
    margin-top: 48px;
    padding-top: 28px;
    border-top: 1px solid var(--line);
    display: flex;
    flex-direction: column;
    gap: 4px;
}
.sig-name {
    font-family: var(--font-serif);
    font-size: 22px;
    color: var(--ink);
    font-style: italic;
}
.sig-role {
    font-size: 12px;
    letter-spacing: 0.2em;
    color: var(--text-mute);
    text-transform: uppercase;
}

.about-image {
    position: relative;
}
.img-placeholder {
    aspect-ratio: 4 / 5;
    background: linear-gradient(160deg, #2a241a 0%, #100c08 100%);
    border-radius: 4px;
    overflow: hidden;
    position: relative;
}
.img-portrait::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 30% 20%, rgba(217,195,154,0.35) 0%, transparent 50%),
        radial-gradient(ellipse at 70% 80%, rgba(200,168,107,0.15) 0%, transparent 60%);
}
.light-beam {
    position: absolute;
    top: -10%; left: 40%;
    width: 1px; height: 60%;
    background: linear-gradient(to bottom, rgba(217,195,154,0.8), transparent);
    transform: rotate(15deg);
    transform-origin: top;
    box-shadow: 0 0 30px rgba(217,195,154,0.5);
}
.img-caption {
    margin-top: 16px;
    font-size: 11px;
    letter-spacing: 0.3em;
    color: var(--text-mute);
    text-transform: uppercase;
    text-align: right;
}

/* ===== Services ===== */
.services { background: var(--paper); }
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 80px;
}
.service-card {
    background: var(--cream);
    padding: 56px 40px;
    border-radius: 4px;
    border: 1px solid var(--line);
    position: relative;
    transition: all .5s var(--ease);
}
.service-card:hover {
    transform: translateY(-6px);
    border-color: var(--gold);
    box-shadow: 0 30px 60px -20px rgba(13,13,14,0.15);
}
.service-card.featured {
    background: var(--ink);
    color: var(--cream);
    border-color: var(--ink);
}
.service-card.featured h3,
.service-card.featured .service-num { color: var(--cream); }
.service-card.featured .service-desc { color: var(--text-on-dark); }
.service-card.featured .service-points li { color: var(--text-on-dark); }
.service-card.featured .service-icon { color: var(--gold-soft); }

.service-num {
    font-family: var(--font-serif);
    font-style: italic;
    font-size: 14px;
    color: var(--gold);
    letter-spacing: 0.1em;
    margin-bottom: 32px;
}
.service-icon {
    font-size: 36px;
    color: var(--gold);
    margin-bottom: 28px;
}
.service-card h3 {
    font-family: var(--font-cn);
    font-size: 24px;
    font-weight: 400;
    color: var(--ink);
    margin-bottom: 20px;
    letter-spacing: 0.02em;
}
.service-desc {
    font-size: 14px;
    line-height: 1.9;
    color: var(--text-mute);
    margin-bottom: 32px;
}
.service-points {
    list-style: none;
    padding-top: 24px;
    border-top: 1px solid var(--line);
}
.service-card.featured .service-points { border-top-color: rgba(255,255,255,0.1); }
.service-points li {
    font-size: 13px;
    padding: 8px 0;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text);
}
.service-points i {
    color: var(--gold);
    font-size: 10px;
}

.featured-tag {
    position: absolute;
    top: 24px; right: 24px;
    font-size: 10px;
    letter-spacing: 0.2em;
    color: var(--gold-soft);
    padding: 4px 12px;
    border: 1px solid var(--gold-soft);
    border-radius: 999px;
    text-transform: uppercase;
}

/* ===== Process ===== */
.process {
    background: var(--ink);
    color: var(--cream);
}
.process-timeline {
    max-width: 880px;
    margin: 0 auto;
    position: relative;
}
.process-step {
    display: grid;
    grid-template-columns: 80px 1fr;
    gap: 40px;
    position: relative;
    padding-bottom: 60px;
}
.step-dot {
    width: 56px; height: 56px;
    border-radius: 50%;
    background: var(--ink-soft);
    border: 1px solid var(--gold);
    display: grid; place-items: center;
    font-family: var(--font-serif);
    font-style: italic;
    color: var(--gold-soft);
    font-size: 16px;
    position: relative;
    z-index: 2;
    transition: all .4s var(--ease);
}
.process-step:hover .step-dot {
    background: var(--gold);
    color: var(--ink);
}
.step-line {
    position: absolute;
    left: 28px; top: 56px;
    bottom: 0;
    width: 1px;
    background: linear-gradient(to bottom, var(--gold), rgba(200,168,107,0.1));
}
.step-line.last { display: none; }
.step-content {
    padding-top: 8px;
}
.step-content h3 {
    font-family: var(--font-cn);
    font-size: 24px;
    font-weight: 400;
    color: var(--text-on-dark);
    margin-bottom: 8px;
}
.step-content h3 .step-label {
    color: var(--gold-soft);
}
.step-time {
    font-size: 11px;
    letter-spacing: 0.25em;
    color: var(--gold-soft);
    text-transform: uppercase;
    margin-bottom: 16px;
}
.step-content > p {
    font-size: 15px;
    line-height: 1.9;
    color: var(--text-on-dark);
    margin-bottom: 16px;
    max-width: 560px;
}
.step-deliv {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 8px 20px;
}
.step-deliv li {
    font-size: 12px;
    color: var(--text-on-dark);
    letter-spacing: 0.05em;
}

/* ===== Projects ===== */
.projects { background: var(--cream); }

/* 4×4 整洁网格 */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-top: 80px;
}

/* 卡片容器 — 固定比例 + 溢出隐藏 */
.project-card {
    position: relative;
    aspect-ratio: 1 / 1;
    overflow: hidden;
    border-radius: 4px;
    cursor: pointer;
    background: var(--ink);
    transition: transform 0.6s var(--ease), box-shadow 0.6s var(--ease);
    will-change: transform;
}
.project-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 24px 48px -16px rgba(13, 13, 14, 0.25);
}

/* 图片区 — 填满卡片 */
.project-card .project-img {
    position: absolute;
    inset: 0;
    overflow: hidden;
    background-size: cover;
    background-position: center;
}
.project-card .project-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.8s var(--ease);
}
.project-card:hover .project-img img {
    transform: scale(1.08);
}

/* 16 个渐变背景（使用 background-image 避免覆盖 background-size） */
.project-card .project-img.bg-1  { background-image: linear-gradient(135deg, #2a1f16, #4a3422); }
.project-card .project-img.bg-2  { background-image: linear-gradient(135deg, #1a1410, #3d2c1e); }
.project-card .project-img.bg-3  { background-image: linear-gradient(135deg, #0f0c0a, #2a241a); }
.project-card .project-img.bg-4  { background-image: linear-gradient(135deg, #1e1a16, #4a3a28); }
.project-card .project-img.bg-5  { background-image: linear-gradient(135deg, #0d0d0e, #2a2a2c); }
.project-card .project-img.bg-6  { background-image: linear-gradient(135deg, #1c1410, #3a281a); }
.project-card .project-img.bg-7  { background-image: linear-gradient(135deg, #1a1816, #3a342a); }
.project-card .project-img.bg-8  { background-image: linear-gradient(135deg, #161210, #2e241c); }
.project-card .project-img.bg-9  { background-image: linear-gradient(135deg, #0d0d0e, #1e1e22); }
.project-card .project-img.bg-10 { background-image: linear-gradient(135deg, #1e1814, #423222); }
.project-card .project-img.bg-11 { background-image: linear-gradient(135deg, #14100e, #2a1e16); }
.project-card .project-img.bg-12 { background-image: linear-gradient(135deg, #0f0f10, #222226); }
.project-card .project-img.bg-13 { background-image: linear-gradient(135deg, #161a18, #2a3430); }
.project-card .project-img.bg-14 { background-image: linear-gradient(135deg, #1c1612, #3a2c20); }
.project-card .project-img.bg-15 { background-image: linear-gradient(135deg, #12100e, #282220); }
.project-card .project-img.bg-16 { background-image: linear-gradient(135deg, #181412, #32261c); }

/* 遮罩 — 默认为底部微渐变，hover 时变为半透明深色 */
.project-card .project-img::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.5) 0%, transparent 40%);
    opacity: 0.6;
    transition: opacity 0.6s var(--ease);
    pointer-events: none;
    z-index: 1;
}
.project-card:hover .project-img::after {
    opacity: 0.85;
    background: rgba(0, 0, 0, 0.55);
}

/* Hover 文字 — 默认隐藏，hover 时居中显示 */
.project-card .project-hover {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 2;
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
    pointer-events: none;
    padding: 24px;
    text-align: center;
}
.project-card:hover .project-hover {
    opacity: 1;
    transform: translateY(0);
}

.project-card .project-hover-title {
    font-family: var(--font-cn);
    font-size: clamp(16px, 1.5vw, 22px);
    font-weight: 400;
    color: #fff;
    letter-spacing: 0.08em;
    margin-bottom: 8px;
    text-shadow: 0 2px 8px rgba(0,0,0,0.3);
}

.project-card .project-hover-type {
    font-size: 11px;
    letter-spacing: 0.25em;
    color: var(--gold-soft);
    text-transform: uppercase;
}

/* ===== Project Detail View ===== */
.project-detail {
    display: none;
    background: var(--cream);
    padding: 100px 0 80px;
    min-height: 100vh;
    animation: detailFadeIn 0.4s var(--ease);
}
@keyframes detailFadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
}

.project-detail .detail-title {
    font-family: var(--font-cn);
    font-size: clamp(28px, 3vw, 42px);
    font-weight: 300;
    color: var(--ink);
    line-height: 1.2;
    margin-bottom: 24px;
}

.project-detail .detail-desc {
    font-size: 15px;
    line-height: 2;
    color: var(--text-mute);
    max-width: 680px;
    margin-bottom: 48px;
}

/* 画廊 2×2 网格 */
.project-detail .detail-gallery {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin-bottom: 48px;
}

.project-detail .gallery-item {
    aspect-ratio: 4 / 3;
    border-radius: 4px;
    overflow: hidden;
    cursor: pointer;
    position: relative;
    transition: opacity 0.3s var(--ease);
    background-size: cover;
    background-position: center;
    background-color: var(--ink);
}
.project-detail .gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.4s var(--ease);
}
.project-detail .gallery-item:hover img {
    transform: scale(1.04);
}
.project-detail .gallery-item::after {
    content: '\f00e';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%) scale(0.7);
    color: #fff;
    font-size: 20px;
    opacity: 0;
    transition: opacity 0.3s var(--ease), transform 0.3s var(--ease);
    pointer-events: none;
    z-index: 2;
}
.project-detail .gallery-item:hover::after {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
}

/* 返回按钮 */
.project-detail .detail-back {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 13px;
    letter-spacing: 0.12em;
    color: var(--text-mute);
    cursor: pointer;
    padding: 12px 24px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: transparent;
    transition: all 0.3s var(--ease);
    font-family: var(--font-sans);
}
.project-detail .detail-back:hover {
    color: var(--gold);
    border-color: var(--gold);
}
.project-detail .detail-back i {
    font-size: 13px;
    transition: transform 0.3s var(--ease);
}
.project-detail .detail-back:hover i {
    transform: translateX(-4px);
}

/* ===== Lightbox ===== */
.lightbox {
    display: none;
    position: fixed;
    z-index: 9999;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.92);
    justify-content: center;
    align-items: center;
    cursor: pointer;
}
.lightbox.active {
    display: flex;
    animation: lightboxIn 0.3s var(--ease);
}
@keyframes lightboxIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}
.lightbox .lightbox-content {
    max-width: 90vw;
    max-height: 90vh;
    object-fit: contain;
    border-radius: 4px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}
.lightbox .lightbox-close {
    position: absolute;
    top: 24px;
    right: 32px;
    color: rgba(255,255,255,0.7);
    font-size: 40px;
    cursor: pointer;
    z-index: 2;
    line-height: 1;
    transition: color 0.3s var(--ease);
    font-family: var(--font-serif);
}
.lightbox .lightbox-close:hover {
    color: #fff;
}

/* 灯箱左右箭头 */
.lightbox .lightbox-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 2;
    background: rgba(255,255,255,0.08);
    border: none;
    color: rgba(255,255,255,0.7);
    width: 52px;
    height: 52px;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    backdrop-filter: blur(4px);
}
.lightbox .lightbox-arrow:hover {
    background: rgba(255,255,255,0.2);
    color: #fff;
}
.lightbox .lightbox-prev  { left: 24px; }
.lightbox .lightbox-next  { right: 24px; }

/* 响应式：小屏缩小箭头 */
@media (max-width: 720px) {
    .lightbox .lightbox-arrow {
        width: 40px;
        height: 40px;
        font-size: 16px;
    }
    .lightbox .lightbox-prev  { left: 12px; }
    .lightbox .lightbox-next  { right: 12px; }
}

/* ===== Detail Mode: hide all homepage content ===== */
body.detail-mode section:not(#projectDetail),
body.detail-mode .site-header,
body.detail-mode .site-footer,
body.detail-mode .floating-cta {
    display: none;
}
body.detail-mode .project-detail {
    display: block !important;
}

/* 画廊响应式 */
@media (max-width: 720px) {
    .project-detail .detail-gallery {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    .project-detail .detail-back {
        width: 100%;
        justify-content: center;
    }
}
/* ===== Testimonials ===== */
.testimonials {
    background: var(--ink);
    color: var(--cream);
}
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    margin-top: 80px;
}
.testimonial-card {
    background: var(--ink-soft);
    border: 1px solid rgba(255,255,255,0.06);
    padding: 48px 44px;
    border-radius: 4px;
    position: relative;
    transition: all .5s var(--ease);
}
.testimonial-card:hover {
    border-color: rgba(200,168,107,0.4);
    transform: translateY(-4px);
}
.quote-mark {
    font-family: var(--font-serif);
    font-size: 80px;
    color: var(--gold);
    line-height: 0.5;
    position: absolute;
    top: 40px; left: 36px;
    opacity: 0.4;
}
.quote-text {
    font-family: var(--font-cn);
    font-size: 17px;
    line-height: 2;
    color: var(--cream);
    margin: 32px 0 36px;
    padding-top: 28px;
    font-weight: 300;
}
.quote-author {
    display: flex;
    align-items: center;
    gap: 16px;
    padding-top: 24px;
    border-top: 1px solid rgba(255,255,255,0.08);
}
.avatar {
    width: 44px; height: 44px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--gold), var(--gold-soft));
    display: grid; place-items: center;
    font-family: var(--font-serif);
    font-style: italic;
    color: var(--ink);
    font-size: 18px;
}
.author-name {
    display: block;
    font-size: 14px;
    color: var(--cream);
    font-weight: 500;
    letter-spacing: 0.05em;
}
.author-role {
    display: block;
    font-size: 11px;
    letter-spacing: 0.2em;
    color: var(--gold-soft);
    text-transform: uppercase;
    margin-top: 4px;
}

/* ===== Contact ===== */
.contact { background: var(--paper); }
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 100px;
    align-items: start;
}
.contact-lead {
    font-size: 15px;
    line-height: 1.9;
    color: var(--text-mute);
    margin-bottom: 48px;
    max-width: 420px;
}
.contact-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 28px;
}
.contact-list li {
    display: flex;
    align-items: flex-start;
    gap: 20px;
}
.contact-list i {
    width: 36px; height: 36px;
    display: grid; place-items: center;
    background: var(--cream);
    color: var(--gold);
    border-radius: 50%;
    font-size: 14px;
    flex-shrink: 0;
}
.ci-label {
    display: block;
    font-size: 10px;
    letter-spacing: 0.3em;
    color: var(--text-mute);
    text-transform: uppercase;
    margin-bottom: 4px;
}
.ci-value {
    display: block;
    font-size: 15px;
    color: var(--ink);
}

.contact-form {
    background: var(--cream);
    padding: 56px 48px;
    border-radius: 4px;
    border: 1px solid var(--line);
}
.contact-form h3 {
    font-family: var(--font-cn);
    font-size: 26px;
    font-weight: 400;
    color: var(--ink);
    margin-bottom: 36px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--line);
}
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}
.form-group { margin-bottom: 24px; }
.form-group label {
    display: block;
    font-size: 11px;
    letter-spacing: 0.2em;
    color: var(--text-mute);
    text-transform: uppercase;
    margin-bottom: 10px;
}
.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 14px 0;
    background: transparent;
    border: none;
    border-bottom: 1px solid var(--line);
    font-family: var(--font-sans);
    font-size: 15px;
    color: var(--ink);
    transition: border-color .3s var(--ease);
}
.form-group textarea {
    resize: vertical;
    padding: 14px 16px;
    border: 1px solid var(--line);
    border-radius: 4px;
    margin-top: 4px;
    font-family: var(--font-sans);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--gold);
}
.form-group input::placeholder,
.form-group textarea::placeholder { color: #b8b3a8; font-weight: 300; }
.form-group select { appearance: none; cursor: pointer; }

.form-submit {
    margin-top: 16px;
    width: 100%;
    justify-content: center;
}
.form-note {
    font-size: 12px;
    color: var(--text-mute);
    text-align: center;
    margin-top: 20px;
    letter-spacing: 0.05em;
}
.form-success {
    display: none;
    margin-top: 24px;
    padding: 20px;
    background: rgba(200, 168, 107, 0.1);
    border: 1px solid var(--gold-soft);
    border-radius: 4px;
    text-align: center;
    color: var(--ink);
}
.form-success i { color: var(--gold); font-size: 24px; margin-bottom: 8px; display: block; }
.form-success.show { display: block; animation: fadeIn .5s var(--ease); }
.form-success.error {
    background: rgba(200, 80, 80, 0.08);
    border-color: rgba(200, 80, 80, 0.3);
}
.form-success.error i { color: #c05050; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ===== Footer ===== */
.site-footer {
    background: var(--ink);
    color: var(--text-on-dark);
    padding: 80px 0 32px;
}
.footer-top {
    display: grid;
    grid-template-columns: 1.2fr 2fr;
    gap: 80px;
    padding-bottom: 48px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-brand .brand { color: var(--cream); margin-bottom: 24px; }
.footer-brand p {
    font-size: 13px;
    line-height: 1.9;
    color: var(--text-mute);
}
.footer-cols {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}
.footer-cols h5 {
    font-size: 11px;
    letter-spacing: 0.3em;
    color: var(--gold-soft);
    text-transform: uppercase;
    margin-bottom: 20px;
    font-weight: 500;
}
.footer-cols a {
    display: block;
    font-size: 13px;
    color: var(--text-on-dark);
    padding: 6px 0;
}
.footer-cols a:hover { color: var(--gold-soft); }
.footer-bottom {
    margin-top: 32px;
    display: flex;
    justify-content: space-between;
    font-size: 11px;
    letter-spacing: 0.2em;
    color: var(--text-mute);
    text-transform: uppercase;
}

/* ===== Floating CTA ===== */
.floating-cta {
    position: fixed;
    bottom: 32px; right: 32px;
    z-index: 90;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 24px;
    background: var(--ink);
    color: var(--cream);
    border-radius: 999px;
    font-size: 13px;
    letter-spacing: 0.15em;
    box-shadow: 0 16px 40px -10px rgba(0,0,0,0.3);
    opacity: 0;
    transform: translateY(20px);
    transition: all .5s var(--ease);
    pointer-events: none;
}
.floating-cta.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}
.floating-cta:hover {
    background: var(--gold);
    transform: translateY(-4px);
}
.floating-cta i { color: var(--gold-soft); }
.floating-cta:hover i { color: #fff; }

/* ===== Reveal animation ===== */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 1s var(--ease), transform 1s var(--ease);
}
.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    section { padding: 100px 0; }
    .about-grid, .contact-grid { grid-template-columns: 1fr; gap: 60px; }
    .services-grid { grid-template-columns: 1fr; }
    .projects-grid { grid-template-columns: repeat(2, 1fr); }
    .project-card.large { grid-column: span 2; }
    .testimonials-grid { grid-template-columns: 1fr; }
    .footer-top { grid-template-columns: 1fr; gap: 40px; }
}

@media (max-width: 720px) {
    .container, .nav-container, .hero-content { padding: 0 22px; }
    section { padding: 80px 0; }
    .nav-menu {
        position: fixed;
        top: 0; right: -100%;
        width: 80%; height: 100vh;
        background: var(--ink);
        flex-direction: column;
        justify-content: center;
        padding: 40px;
        gap: 28px;
        transition: right .5s var(--ease);
    }
    .nav-menu.open { right: 0; }
    .nav-menu a { color: var(--cream); font-size: 16px; }
    .site-header.scrolled .nav-menu a { color: var(--cream); }
    .nav-toggle { display: flex; }

    .hero-title { font-size: 44px; }
    .hero-meta { flex-wrap: wrap; gap: 20px; }
    .hero-meta .divider { display: none; }

    .projects-grid { grid-template-columns: 1fr; }
    .project-card { aspect-ratio: 1 / 1; }

    .process-step { grid-template-columns: 56px 1fr; gap: 24px; }
    .step-dot { width: 40px; height: 40px; font-size: 13px; }
    .step-line { left: 20px; top: 40px; }

    .form-row { grid-template-columns: 1fr; gap: 0; }
    .contact-form { padding: 40px 28px; }

    .footer-cols { grid-template-columns: repeat(2, 1fr); }
    .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }

    .floating-cta { bottom: 20px; right: 20px; padding: 12px 20px; font-size: 12px; }
}