/* ================================================================
   HK-Sound  —  Sonance-inspired Minimal Architecture (Scheme A)
   Colors:  #111 (black announce/footer) | #fff (body/nav) | #1D7DD1 (accent blue)
   ================================================================ */

/* ---------- Reset & Core ---------- */
:root {
    --accent: #1D7DD1;       /* Sonance 同款亮天蓝点缀（标语/链接/按钮） */
    --accent-dark: #155FA0;
    --black: #111111;
    --white: #FFFFFF;
    --text: #000000;
    --text-sub: #666666;
    --border: #ECECEC;
    --shadow-soft: 0 1px 0 rgba(0, 0, 0, 0.04);
    --radius: 4px;
    --tr: 260ms ease;
    /* product & category backward compat for product.html rendering */
    --primary: #4B8821;
    --primary-dark: #3D6E1C;
    --light-gray: #FAFAFA;
    --dark: #111;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue",
                 Helvetica, Arial, sans-serif, "PingFang SC", "Microsoft YaHei";
    color: var(--text);
    background: var(--white);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { cursor: pointer; background: none; border: none; font-family: inherit; }
.container {
    max-width: 1360px;
    margin: 0 auto;
    padding: 0 48px;
}

/* ---------- Top Announcement Bar (Sonance: 40px 全黑條) ---------- */
.announce-bar {
    background: var(--black);
    color: #fff;
    font-size: 13px;
    letter-spacing: 0.4px;
    text-align: center;
    padding: 12px 56px;
    position: relative;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.announce-bar a {
    color: #fff;
    font-weight: 500;
    margin-left: 10px;
    padding-bottom: 1px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.55);
    transition: border-color var(--tr);
}
.announce-bar a:hover { border-color: var(--accent); }

/* ---------- Minimal Navigation ---------- */
.site-nav {
    position: sticky;
    top: 0;
    z-index: 900;
    background: var(--white);
    border-bottom: 1px solid var(--border);
}
.site-nav-inner {
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 48px;
    height: 100px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.site-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-weight: 500;
    font-size: 34px;
    letter-spacing: 1px;
    color: #111;
}
/* Small triangle accent mimicking Sonance logo (center second letter) */
.site-logo .tri {
    display: inline-block;
    width: 0; height: 0;
    border-left: 11px solid transparent;
    border-right: 11px solid transparent;
    border-bottom: 17px solid var(--accent);
    transform: translateY(-2px);
    margin: 0 2px;
}
.site-logo img {
    height: 80px;
    width: auto;
    object-fit: contain;
}
.burger-btn {
    width: 44px;
    height: 44px;
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    border-radius: 6px;
    transition: background var(--tr);
}
.burger-btn:hover { background: #F3F3F3; }
.burger-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: #111;
    border-radius: 2px;
    transition: transform var(--tr), opacity var(--tr);
}

/* ---------- Fullscreen Hamburger Overlay ---------- */
.menu-overlay {
    position: fixed;
    inset: 0;
    z-index: 2000;
    background: rgba(17, 17, 17, 0.985);
    opacity: 0;
    visibility: hidden;
    transition: opacity 320ms ease, visibility 320ms ease;
    overflow-y: auto;
    padding: 96px 48px 80px;
    color: #fff;
}
.menu-overlay.open { opacity: 1; visibility: visible; }
.menu-close {
    position: absolute;
    top: 26px; right: 48px;
    width: 44px; height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    color: #fff;
    font-size: 34px;
    line-height: 1;
    font-weight: 200;
    transition: background var(--tr);
}
.menu-close:hover { background: rgba(255, 255, 255, 0.12); }
.menu-grid {
    max-width: 1360px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 64px 48px;
}
.menu-col h4 {
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}
.menu-col li { margin-bottom: 10px; }
.menu-col a {
    color: #fff;
    font-size: 16px;
    font-weight: 400;
    line-height: 1.5;
    padding: 2px 0;
    display: inline-block;
    transition: color var(--tr), transform var(--tr);
}
.menu-col a:hover { color: var(--accent); transform: translateX(3px); }

/* ---------- Sonance Hero: 單屏全寬大圖（無輪播） ---------- */
.hero-screen {
    width: 100%;
    height: calc(100vh - 124px);   /* 40 黑條 + 84 導航 = 124 */
    min-height: 520px;
    background: #111 center center / cover no-repeat;
    position: relative;
    overflow: hidden;
}
.hero-screen::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(0,0,0,0) 55%, rgba(0,0,0,0.35) 100%);
}

/* ---------- Manifesto Section (Sonance: 宣言 + 大字標語) ---------- */
.manifesto {
    padding: 110px 48px;
    text-align: center;
    background: var(--white);
}
.manifesto p {
    max-width: 1080px;
    margin: 0 auto 28px;
    font-size: 21px;
    line-height: 1.7;
    color: #2a2a2a;
    letter-spacing: 0.1px;
    font-weight: 300;
}
.manifesto-slogan {
    font-size: 34px;
    font-weight: 500;
    letter-spacing: 0.6px;
    color: var(--accent);
    font-style: italic;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--accent);
    display: inline-block;
    line-height: 1.25;
}

/* ---------- Category Tiles (Sonance: 全寬大圖分類入口) ---------- */
.cat-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    width: 100%;
    background: var(--black);
    gap: 1px;
    border-top: 1px solid #000;
    border-bottom: 1px solid #000;
}
.cat-row.cat-4 { grid-template-columns: repeat(4, 1fr); }
.cat-tile {
    position: relative;
    aspect-ratio: 4 / 5;
    overflow: hidden;
    background: #111 center center / cover no-repeat;
    background-size: cover;
    background-position: center;
    cursor: pointer;
    display: block;
    transition: filter 480ms cubic-bezier(.25,.8,.3,1), background-size 600ms cubic-bezier(.25,.8,.3,1);
    will-change: filter;
}
/* Image zoom / brighten illusion via background-size expansion on hover */
.cat-tile { background-size: 100% auto; }
.cat-tile::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(17,17,17,0.10) 0%, rgba(17,17,17,0.18) 45%, rgba(17,17,17,0.86) 100%);
    z-index: 1;
    transition: background 420ms ease, backdrop-filter 420ms ease, -webkit-backdrop-filter 420ms ease;
}
.cat-tile::after {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 50% 30%, rgba(255,255,255,0.00) 0%, rgba(255,255,255,0.00) 40%);
    z-index: 1;
    opacity: 0;
    transition: opacity 480ms ease;
    pointer-events: none;
}
.cat-tile .cat-title {
    position: absolute;
    left: 40px; right: 40px; bottom: 40px;
    z-index: 2;
    color: #F5F5F5;
    transition: transform 420ms cubic-bezier(.25,.8,.3,1), color 380ms ease, text-shadow 380ms ease, filter 380ms ease;
    will-change: transform;
}
.cat-tile .cat-title h3 {
    margin: 0 0 14px;
    font-size: 30px;
    font-weight: 500;
    letter-spacing: 0.6px;
    line-height: 1.15;
    color: #F3F3F3;
    transition: color 380ms ease, text-shadow 380ms ease, transform 420ms ease, letter-spacing 420ms ease;
}
.cat-tile .cat-title span {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 1.6px;
    padding: 10px 0;
    border-top: 1px solid rgba(255,255,255,0.38);
    color: #F0F0F0;
    transition: color 380ms ease, padding 420ms cubic-bezier(.25,.8,.3,1), letter-spacing 420ms ease, border-color 380ms ease, text-shadow 380ms ease;
}
/* ---------- Hover: 图片明显变亮 + 文字纯白发光 ---------- */
.cat-tile:hover {
    /* 显著提亮 + 略微饱和，保持真实色彩但鲜活 */
    filter: brightness(1.24) saturate(1.18) contrast(1.04);
    background-size: 106% auto;
}
.cat-tile:hover::before {
    /* 淡化深色渐变遮罩 → 让整张图更通透亮 */
    background: linear-gradient(180deg, rgba(17,17,17,0.00) 0%, rgba(17,17,17,0.03) 45%, rgba(17,17,17,0.55) 100%);
}
.cat-tile:hover::after {
    /* 顶部柔光叠加，模拟灯光被点亮的电影感 */
    opacity: 1;
    background: radial-gradient(circle at 50% 22%, rgba(255,255,255,0.22) 0%, rgba(255,255,255,0.06) 40%, rgba(255,255,255,0.00) 68%);
}
.cat-tile:hover .cat-title {
    transform: translateY(-4px);
}
.cat-tile:hover .cat-title h3 {
    /* 文字 100% 纯白 + 柔和白晕发光（不刺眼的发光白） */
    color: #FFFFFF;
    letter-spacing: 0.9px;
    text-shadow: 0 1px 2px rgba(0,0,0,0.22), 0 0 22px rgba(255,255,255,0.30), 0 0 8px rgba(255,255,255,0.18);
}
.cat-tile:hover .cat-title span {
    /* 链接文案：更亮纯白 + 更清晰 100% 白 border-top + 蓝色下划线右移 */
    color: #FFFFFF;
    border-color: rgba(255,255,255,0.92);
    padding-left: 16px;
    letter-spacing: 2.2px;
    text-shadow: 0 0 14px rgba(255,255,255,0.28);
}

/* Backgrounds for the 4 homepage category tiles (new generated Sonance-style imagery) */
.cat-bg-1 { background-image: url('../images/cat_inwall_inceiling.jpg?v=a'); }
.cat-bg-2 { background-image: url('../images/cat_architectural.jpg?v=a'); }
.cat-bg-3 { background-image: url('../images/cat_sub_amp.jpg?v=a'); }
.cat-bg-4 { background-image: url('../images/cat_outdoor_marine.jpg?v=a'); }

/* ---------- Deep Black Footer (Sonance 架構) ---------- */
.site-footer {
    background: #0E0E0E;
    color: #CFCFCF;
    padding: 88px 48px 0;
    border-top: 1px solid #1D7DD122;
}
.footer-outer { max-width: 1480px; margin: 0 auto; }
.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 20px;
    max-width: 360px;
}
.footer-brand-logo {
    color: #fff;
    font-size: 30px;
    letter-spacing: 1.2px;
    font-weight: 500;
}
.footer-brand-logo .tri {
    display: inline-block;
    width: 0; height: 0;
    border-left: 10px solid transparent;
    border-right: 10px solid transparent;
    border-bottom: 15px solid var(--accent);
    transform: translateY(-2px);
    margin: 0 1px;
}
.footer-brand p {
    font-size: 14px;
    line-height: 1.8;
    color: #999;
}
.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1.4fr 1fr;
    gap: 48px;
    padding-bottom: 56px;
    border-bottom: 1px solid #262626;
}
.footer-col h5 {
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: #fff;
    margin-bottom: 22px;
}
.footer-col li { margin-bottom: 10px; }
.footer-col a {
    color: #A9A9A9;
    font-size: 14px;
    transition: color var(--tr), padding-left var(--tr);
    display: inline-block;
}
.footer-col a:hover {
    color: var(--accent);
    padding-left: 4px;
}

/* ---------- Subscribe + Social ---------- */
.footer-cta {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 32px;
    padding: 48px 0;
    border-bottom: 1px solid #262626;
}
.subscribe {
    display: flex;
    gap: 0;
    flex: 1;
    min-width: 320px;
    max-width: 540px;
}
.subscribe input {
    flex: 1;
    padding: 14px 16px;
    font-size: 14px;
    background: #1A1A1A;
    color: #fff;
    border: 1px solid #2E2E2E;
    border-right: none;
    border-radius: 3px 0 0 3px;
    outline: none;
    transition: border-color var(--tr);
}
.subscribe input:focus { border-color: var(--accent); }
.subscribe button {
    padding: 0 22px;
    background: var(--accent);
    color: #fff;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 1.5px;
    border-radius: 0 3px 3px 0;
    transition: background var(--tr);
}
.subscribe button:hover { background: var(--accent-dark); }
.footer-signup-head {
    color: #fff;
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 6px;
    letter-spacing: 1px;
}
.footer-signup-sub { color: #999; font-size: 13px; }
.socials {
    display: flex;
    gap: 10px;
}
.socials a {
    width: 42px;
    height: 42px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: #1A1A1A;
    color: #E6E6E6;
    border-radius: 50%;
    font-size: 15px;
    transition: all var(--tr);
}
.socials a:hover {
    background: var(--accent);
    color: #fff;
    transform: translateY(-2px);
}

.footer-bottom {
    padding: 24px 0 32px;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 14px;
    color: #7A7A7A;
    font-size: 12.5px;
}
.footer-bottom ul { display: flex; gap: 22px; flex-wrap: wrap; }
.footer-bottom a { color: #7A7A7A; transition: color var(--tr); }
.footer-bottom a:hover { color: var(--accent); }

/* ---------- Back to Top ---------- */
.to-top {
    position: fixed;
    right: 28px;
    bottom: 28px;
    width: 44px; height: 44px;
    border-radius: 50%;
    background: #000000cc;
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--tr);
    z-index: 800;
    backdrop-filter: blur(6px);
}
.to-top:hover { background: var(--accent); }
.to-top.show { opacity: 1; visibility: visible; transform: translateY(0); }

/* ================================================================
   Product Category Grid / Cards (product.html 的产品列表依赖)
   Minimalist Sonance 风格：无圆角木纹装饰，纯白卡片细边
   ================================================================ */
.cat-page-hero {
    background: #F6F6F6;
    padding: 50px 48px 40px;
    border-bottom: 1px solid var(--border);
}
.cat-page-hero h1 {
    font-size: 40px;
    letter-spacing: 1.5px;
    font-weight: 500;
    margin-bottom: 8px;
}
.cat-page-hero p { color: #777; max-width: 880px; font-size: 15px; }
.cat-filters {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: center;
    padding: 40px 48px 10px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 40px;
    background: var(--white);
}
.cat-filter-btn {
    padding: 10px 22px;
    font-size: 13px;
    letter-spacing: 1px;
    text-transform: uppercase;
    background: transparent;
    border: 1px solid #DCDCDC;
    border-radius: 3px;
    color: #333;
    transition: all var(--tr);
}
.cat-filter-btn:hover { border-color: #999; color: #111; }
.cat-filter-btn.active {
    background: var(--black);
    color: #fff;
    border-color: var(--black);
}
.product-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px 24px;
    padding: 0 48px 80px;
    max-width: 1600px;
    margin: 0 auto;
}
.product-card {
    border: 1px solid var(--border);
    background: var(--white);
    transition: transform var(--tr), box-shadow var(--tr), border-color var(--tr);
    display: flex;
    flex-direction: column;
}
.product-card:hover {
    transform: translateY(-3px);
    border-color: var(--accent);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.07);
}
.product-img {
    aspect-ratio: 4 / 3;
    background: #FBFBFB;
    padding: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-bottom: 1px solid var(--border);
}
.product-img img {
    width: 100%; height: 100%;
    object-fit: contain;
    transition: transform 450ms ease;
}
.product-card:hover .product-img img { transform: scale(1.04); }
.product-info { padding: 18px 18px 20px; flex: 1; display: flex; flex-direction: column; }
.product-info h3 { font-size: 16px; font-weight: 600; color: #111; margin-bottom: 6px; }
.product-info p { font-size: 13px; color: #888; line-height: 1.6; margin-bottom: 14px; flex: 1; }
.product-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 12px;
    border-top: 1px dashed var(--border);
}
.product-meta .p-model { font-size: 12px; letter-spacing: 1px; color: #555; font-weight: 600; }
.product-meta .p-more  { font-size: 12px; color: var(--accent); font-weight: 600; letter-spacing: 0.5px; }
.product-meta .p-more:hover { border-bottom: 1px solid var(--accent); }

/* ---------- About (Product.html 內頁需要) ---------- */
.about-wrap {
    padding: 80px 48px;
    max-width: 1200px;
    margin: 0 auto;
}
.about-wrap h2 {
    font-size: 34px;
    letter-spacing: 2px;
    margin-bottom: 24px;
    text-align: center;
    font-weight: 500;
}
.about-wrap p {
    font-size: 16px;
    color: #444;
    line-height: 1.85;
    margin-bottom: 16px;
}

/* ---------- Contact Form ---------- */
.contact-wrap {
    padding: 80px 48px;
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1.3fr;
    gap: 56px;
}
.contact-info-item {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
    align-items: flex-start;
}
.contact-info-item svg, .contact-info-item .c-ic {
    width: 42px;
    height: 42px;
    min-width: 42px;
    border-radius: 50%;
    background: #F3F7FB;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--accent);
    font-size: 16px;
}
.contact-info-item h4 { font-size: 14px; letter-spacing: 1px; font-weight: 600; color: #222; margin-bottom: 4px; }
.contact-info-item p { font-size: 14px; color: #555; }

.contact-form-wrap {
    background: #FAFAFA;
    border: 1px solid var(--border);
    padding: 40px;
    border-radius: 2px;
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; color: #333; letter-spacing: 0.5px; }
.form-group input, .form-group select, .form-group textarea {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid #DDD;
    background: #fff;
    border-radius: 3px;
    font-size: 14px;
    outline: none;
    transition: border-color var(--tr), box-shadow var(--tr);
    font-family: inherit;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(29,125,209,0.12);
}
.form-group textarea { min-height: 120px; resize: vertical; }
.btn-submit {
    display: inline-block;
    padding: 14px 36px;
    background: var(--black);
    color: #fff;
    letter-spacing: 2px;
    font-weight: 600;
    font-size: 13px;
    border-radius: 3px;
    transition: background var(--tr);
}
.btn-submit:hover { background: var(--accent); }

/* ---------- Empty state & result meta ---------- */
.result-bar {
    max-width: 1600px;
    margin: -10px auto 16px;
    padding: 0 48px;
    font-size: 13px;
    color: #888;
    letter-spacing: 0.5px;
}
.result-bar strong { color: var(--black); font-weight: 600; }
.empty-state {
    max-width: 1600px;
    margin: 0 auto 100px;
    padding: 80px 48px;
    text-align: center;
    border: 1px dashed #DDD;
}
.empty-state h3 {
    font-size: 22px;
    letter-spacing: 1px;
    color: #222;
    margin-bottom: 10px;
    font-weight: 500;
}
.empty-state p { color: #888; margin-bottom: 26px; font-size: 14px; }
.empty-state .es-btn {
    display: inline-block;
    padding: 12px 28px;
    background: var(--black);
    color: #fff;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 1.5px;
    border-radius: 3px;
}
.empty-state .es-btn:hover { background: var(--accent); }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
    .container { padding: 0 24px; }
    .site-nav-inner { padding: 0 24px; height: 84px; }
    .site-logo { font-size: 26px; }
    .site-logo img { height: 60px; }
    .announce-bar { padding: 10px 44px 10px 20px; font-size: 12px; }
    .hero-screen { height: calc(100vh - 108px); min-height: 420px; }
    .manifesto { padding: 80px 24px; }
    .manifesto p { font-size: 17px; }
    .manifesto-slogan { font-size: 24px; }
    .cat-row, .cat-row.cat-4 { grid-template-columns: 1fr; }
    .cat-tile { aspect-ratio: 16 / 10; }
    .cat-title h3 { font-size: 24px; }
    .menu-overlay { padding: 80px 24px 60px; }
    .menu-close { right: 24px; top: 20px; }
    .menu-grid { grid-template-columns: repeat(2, 1fr); gap: 40px 24px; }
    .footer-grid { grid-template-columns: repeat(2, 1fr); gap: 40px 24px; }
    .site-footer { padding: 64px 24px 0; }
    .footer-cta { flex-direction: column; align-items: flex-start; }
    .subscribe { max-width: none; }
    .footer-bottom { flex-direction: column; }
    .product-grid { grid-template-columns: repeat(2, 1fr); padding: 0 24px 60px; gap: 24px 16px; }
    .cat-filters { padding: 30px 24px 0; }
    .cat-page-hero { padding: 36px 24px 28px; }
    .cat-page-hero h1 { font-size: 30px; }
    .result-bar { padding: 0 24px; }
    .empty-state { margin: 0 24px 80px; padding: 60px 24px; }
    .contact-wrap { grid-template-columns: 1fr; padding: 60px 24px; }
    .about-wrap { padding: 60px 24px; }
    .about-wrap h2 { font-size: 26px; }
    .form-row { grid-template-columns: 1fr; }
    .contact-form-wrap { padding: 28px 22px; }
}
@media (max-width: 520px) {
    .menu-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .product-grid { grid-template-columns: 1fr; }
    .manifesto p { font-size: 15px; }
    .manifesto-slogan { font-size: 20px; }
    .cat-title { left: 24px; bottom: 28px; right: 24px; }
    .cat-title h3 { font-size: 20px; }
}