/* ===== 设计系统 ===== */
:root {
    --color-ink: #231815;       /* logo 主色 */
    --color-ink-soft: #3d322e;
    --color-text: #2C2A28;
    --color-muted: #8a847e;
    --color-line: rgba(35, 24, 21, 0.08);
    --color-bg: #FAF6EF;        /* 米白底 */
    --color-cream: #FFF4E6;     /* 软奶油 */
    --color-card: #FFFFFF;
    --color-accent: #F26B2C;    /* 暖橘 */
    --color-accent-soft: rgba(242, 107, 44, 0.1);
    --radius: 14px;
    --radius-lg: 22px;
    --shadow-sm: 0 2px 12px rgba(35, 24, 21, 0.04);
    --shadow-md: 0 12px 28px rgba(35, 24, 21, 0.08);
    --shadow-lg: 0 20px 50px rgba(35, 24, 21, 0.12);
    --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: 'Noto Serif SC', 'PingFang SC', 'Helvetica Neue', serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

/* ===== 顶部导航（固定）===== */
.topbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: clamp(22px, 2.8vw, 32px);
    padding: 0 4vw;
    background: rgba(250, 246, 239, 0.88);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--color-line);
}

.logo {
    display: flex;
    align-items: center;
    line-height: 0;
}

.logo img {
    height: clamp(10px, 1.4vw, 16px);
    width: auto;
    transition: opacity 0.2s;
    display: block;
}

.logo:hover img { opacity: 0.7; }

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-link {
    font-size: 0.78rem;
    letter-spacing: 0.1em;
    color: var(--color-ink);
    position: relative;
    padding: 0.25rem 0;
    transition: color 0.2s;
}

.nav-link::after {
    content: '';
    position: absolute;
    left: 0; bottom: -2px;
    width: 100%; height: 1px;
    background: var(--color-accent);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.35s var(--ease);
}

.nav-link:hover { color: var(--color-accent); }
.nav-link:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}

/* ===== Hero 首屏 ===== */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    position: relative;
    padding: 5rem 6vw 14vh;
    background:
        radial-gradient(ellipse at 80% 20%, rgba(242, 107, 44, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 20% 80%, rgba(255, 244, 230, 0.6) 0%, transparent 50%),
        var(--color-bg);
    overflow: hidden;
}

.hero-inner {
    max-width: 900px;
    text-align: center;
    animation: fadeUp 1.2s var(--ease);
}

.hero-logo {
    height: clamp(20px, 3.25vw, 45px);
    width: auto;
    margin: 2rem auto 0;
    animation: heroLogoIn 1.4s var(--ease);
}

@keyframes heroLogoIn {
    from { opacity: 0; transform: translateY(20px) scale(0.95); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
}

.hero-title {
    font-size: clamp(1.85rem, 5.5vw, 4.4rem);
    font-weight: 500;
    color: var(--color-ink);
    letter-spacing: 0.18em;
    line-height: 1.3;
    margin-bottom: 1.8rem;
    white-space: nowrap;
}

.hero-sub {
    font-size: clamp(0.95rem, 1.6vw, 1.15rem);
    color: var(--color-muted);
    letter-spacing: 0.15em;
    margin-bottom: 3rem;
}

.hero-cta {
    display: inline-block;
    padding: 0.9rem 2.2rem;
    background: var(--color-ink);
    color: #fff;
    border-radius: 999px;
    font-size: 0.95rem;
    letter-spacing: 0.15em;
    transition: transform 0.25s var(--ease), background 0.25s, box-shadow 0.3s;
    box-shadow: var(--shadow-sm);
}

.hero-cta:hover {
    background: var(--color-accent);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.hero-scroll {
    position: absolute;
    bottom: 2.5rem;
    left: 50%;
    transform: translateX(-50%);
    width: 1px;
    height: 50px;
    background: var(--color-line);
    overflow: hidden;
}

.hero-scroll span {
    display: block;
    width: 100%;
    height: 20px;
    background: var(--color-ink);
    animation: scrollIndicator 2.2s var(--ease) infinite;
}

@keyframes scrollIndicator {
    0%   { transform: translateY(-100%); }
    100% { transform: translateY(250%); }
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(24px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ===== 通用 Section ===== */
.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 3.5rem;
}

.section-eyebrow {
    font-size: 0.78rem;
    letter-spacing: 0.5em;
    color: var(--color-accent);
    margin-bottom: 0.8rem;
    font-weight: 500;
}

.section-title {
    font-size: clamp(1.8rem, 4vw, 2.6rem);
    font-weight: 500;
    color: var(--color-ink);
    letter-spacing: 0.1em;
    margin-bottom: 1rem;
}

.section-sub {
    color: var(--color-muted);
    font-size: 0.95rem;
    letter-spacing: 0.1em;
}

/* ===== 产品区 ===== */
.products {
    padding: 7rem 4vw;
    background: var(--color-cream);
}

.tabs {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.6rem;
    margin-bottom: 3rem;
}

.tab {
    background: transparent;
    border: 1px solid var(--color-line);
    color: var(--color-ink);
    font-size: 0.92rem;
    padding: 0.7rem 1.5rem;
    letter-spacing: 0.12em;
    border-radius: 999px;
    transition: all 0.25s var(--ease);
}

.tab:hover {
    border-color: var(--color-ink);
    background: rgba(35, 24, 21, 0.04);
}

.tab.active {
    background: var(--color-ink);
    color: #fff;
    border-color: var(--color-ink);
}

.stage {
    max-width: 1200px;
    margin: 0 auto;
    min-height: 360px;
}

.default-hint {
    text-align: center;
    padding: 5rem 1rem;
    color: var(--color-muted);
    font-size: 0.95rem;
    letter-spacing: 0.1em;
    animation: fadeIn 0.5s ease;
}

.gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 1.2rem;
    animation: fadeIn 0.5s ease;
}

.photo-card {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius);
    cursor: zoom-in;
    aspect-ratio: 1 / 1;
    background: var(--color-card);
    box-shadow: var(--shadow-sm);
    transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px;
}

.photo-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.photo-card img {
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    object-fit: contain;
    opacity: 0;
    transition: opacity 0.5s ease, transform 0.6s ease;
}

.photo-card img.loaded { opacity: 1; }
.photo-card:hover img { transform: scale(1.04); }

/* 即将上市 */
.gallery.coming-soon {
    grid-template-columns: 1fr;
    max-width: 580px;
    margin: 0 auto;
}

.coming-soon-card {
    background: var(--color-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-line);
    padding: 5rem 2rem;
    text-align: center;
    box-shadow: var(--shadow-sm);
    animation: fadeIn 0.5s ease;
}

.coming-soon-title {
    font-size: 1.05rem;
    color: var(--color-muted);
    letter-spacing: 0.4em;
    margin-bottom: 1.5rem;
    text-transform: uppercase;
}

.coming-soon-line {
    font-size: clamp(1.6rem, 3vw, 2.2rem);
    color: var(--color-ink);
    letter-spacing: 0.3em;
    font-weight: 500;
    margin-bottom: 1rem;
}

.coming-soon-sub {
    font-size: 0.85rem;
    color: var(--color-accent);
    letter-spacing: 0.35em;
}

/* ===== 关于 / 联系 ===== */
.about, .contact {
    padding: 6rem 4vw;
    text-align: center;
}

.about-inner, .contact-inner {
    max-width: 720px;
    margin: 0 auto;
}

.about-text {
    color: var(--color-text);
    font-size: clamp(1rem, 1.6vw, 1.15rem);
    line-height: 2;
    letter-spacing: 0.05em;
    margin-top: 1rem;
}

.contact { background: var(--color-cream); }
.contact-text {
    color: var(--color-muted);
    margin-bottom: 1rem;
    letter-spacing: 0.15em;
}
.contact-info {
    color: var(--color-ink);
    font-size: 1.05rem;
    letter-spacing: 0.05em;
}

/* ===== 页脚 ===== */
.footer {
    padding: 3rem 4vw 2.5rem;
    background: var(--color-ink);
    color: rgba(255, 255, 255, 0.7);
    text-align: center;
}

.footer-logo {
    height: 22px;
    margin: 0 auto 1rem;
    filter: brightness(0) invert(1);
    opacity: 0.85;
}

.footer-copy {
    font-size: 0.85rem;
    letter-spacing: 0.2em;
}

/* ===== Lightbox ===== */
.lightbox {
    display: none;
    position: fixed;
    z-index: 9999;
    inset: 0;
    background: rgba(15, 10, 8, 0.95);
    align-items: center;
    justify-content: center;
    padding: 3rem;
}

.lightbox.active {
    display: flex;
    animation: fadeIn 0.25s ease;
}

.lightbox-img {
    max-width: 92vw;
    max-height: 88vh;
    object-fit: contain;
    border-radius: 6px;
}

.lightbox-close,
.lightbox-prev,
.lightbox-next {
    position: absolute;
    color: rgba(255, 255, 255, 0.7);
    font-size: 2rem;
    cursor: pointer;
    user-select: none;
    transition: color 0.2s, transform 0.2s;
    z-index: 10000;
    line-height: 1;
}

.lightbox-close:hover,
.lightbox-prev:hover,
.lightbox-next:hover {
    color: #fff;
}

.lightbox-close { top: 1.5rem; right: 2rem; font-size: 2.8rem; }
.lightbox-prev  { left: 2rem;  top: 50%; transform: translateY(-50%); }
.lightbox-next  { right: 2rem; top: 50%; transform: translateY(-50%); }
.lightbox-prev:hover { transform: translateY(-50%) scale(1.15); }
.lightbox-next:hover { transform: translateY(-50%) scale(1.15); }

/* ===== 动画 ===== */
@keyframes fadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .topbar { padding: 0 1.2rem; height: clamp(18px, 4vw, 24px); }
    .nav-links { gap: 0.9rem; }
    .nav-link { font-size: 0.72rem; letter-spacing: 0.05em; }
    .logo img { height: clamp(8px, 2vw, 12px); }

    .hero { padding: 6rem 1.5rem 4rem; min-height: 90vh; }
    .hero-eyebrow { font-size: 0.7rem; letter-spacing: 0.25em; margin-bottom: 1.5rem; }
    .hero-sub { letter-spacing: 0.1em; margin-bottom: 2rem; }

    .products, .about, .contact { padding: 4.5rem 1.2rem; }
    .section-header { margin-bottom: 2.5rem; }

    .tabs { gap: 0.4rem; }
    .tab { font-size: 0.82rem; padding: 0.55rem 0.95rem; letter-spacing: 0.05em; }

    .gallery {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.7rem;
    }

    .lightbox-close { top: 1rem; right: 1rem; font-size: 2.4rem; }
    .lightbox-prev  { left: 0.5rem; font-size: 1.8rem; }
    .lightbox-next  { right: 0.5rem; font-size: 1.8rem; }
}

@media (max-width: 480px) {
    .nav-links { gap: 0.8rem; }
    .nav-link { font-size: 0.78rem; }
    .hero-cta { padding: 0.75rem 1.6rem; font-size: 0.88rem; }
}