/* ========== GLOBAL VARIABLES & RESET (Shared with navigation) ========== */
:root {
    --bg: #faf8f5;
    --card-bg: #ffffff;
    --text: #2a2826;
    --text-light: #8b8579;
    --border: rgba(200, 190, 175, 0.35);
    --accent: #c9af86;
    --accent-hover: #b8996e;
    --nav-bg: rgba(250, 248, 245, 0.94);
    --shadow: 0 8px 24px rgba(0,0,0,0.03);
    --radius: 22px;
    --transition: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --nav-text: #2a2826;
}

/* Dark mode overrides */
@media (prefers-color-scheme: dark) {
    :root {
        --bg: #1b1916;
        --card-bg: #272420;
        --text: #e6ddcd;
        --text-light: #b7ae9c;
        --border: rgba(140, 128, 108, 0.28);
        --accent: #b9986b;
        --accent-hover: #c8a87a;
        --nav-bg: rgba(27, 25, 22, 0.94);
        --shadow: 0 8px 24px rgba(0,0,0,0.15);
        --nav-text: #ede5d9;
    }
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background: var(--bg);
    font-family: 'Inter', 'Segoe UI', 'Roboto', system-ui, -apple-system, 'Helvetica Neue', 'PingFang SC', sans-serif;
    padding: 0;
    color: var(--text);
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    background-image: radial-gradient(ellipse at 50% 0%, #fdf9f2 0%, #f5f1e9 100%);
    background-attachment: fixed;
}

@media (prefers-color-scheme: dark) {
    body {
        background-image: radial-gradient(ellipse at 50% 0%, #24211c 0%, #181612 100%);
    }
}

/* ========== NAVIGATION ========== */
.site-nav {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--nav-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    padding: 0 1.5rem;
    width: 100%;
    transition: box-shadow 0.3s;
}
.site-nav.scrolled {
    box-shadow: 0 2px 16px rgba(0, 0, 0, 0.08);
}
.nav-inner {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 58px;
    gap: 1rem;
}
.nav-logo {
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: -0.3px;
    color: var(--text);
    text-decoration: none;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 0.45rem;
    transition: opacity 0.2s;
}
.nav-logo:hover { opacity: 0.75; }
.nav-logo .logo-dot {
    display: inline-block;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--accent);
    flex-shrink: 0;
}
.nav-links {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    list-style: none;
    flex-wrap: wrap;
    justify-content: flex-end;
}
.nav-links a {
    text-decoration: none;
    color: var(--nav-text);
    font-weight: 500;
    font-size: 0.88rem;
    padding: 0.45rem 0.75rem;
    border-radius: 8px;
    transition: background 0.2s, color 0.2s;
    white-space: nowrap;
    letter-spacing: 0.1px;
}
.nav-links a:hover,
.nav-links a.active {
    background: rgba(180, 160, 130, 0.12);
    color: var(--accent);
}

/* Dropdown */
.nav-dropdown { position: relative; }
.nav-dropdown-toggle {
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.45rem 0.75rem;
    border-radius: 8px;
    font-weight: 500;
    font-size: 0.88rem;
    transition: background 0.2s, color 0.2s;
    white-space: nowrap;
    letter-spacing: 0.1px;
    user-select: none;
    color: var(--nav-text);
    background: none;
    border: none;
    font-family: inherit;
}
.nav-dropdown-toggle:hover {
    background: rgba(180, 160, 130, 0.12);
    color: var(--accent);
}
.nav-dropdown-toggle .arrow {
    font-size: 0.6rem;
    transition: transform 0.25s;
}
.nav-dropdown.open .nav-dropdown-toggle .arrow { transform: rotate(180deg); }
.nav-dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 6px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
    padding: 0.5rem 0;
    min-width: 220px;
    max-height: 420px;
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity 0.22s, transform 0.22s, visibility 0.22s;
    z-index: 1001;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
}
.nav-dropdown.open .nav-dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.nav-dropdown-menu a {
    display: block;
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
    border-radius: 0;
    white-space: nowrap;
    color: var(--nav-text);
    text-decoration: none;
    transition: background 0.15s;
}
.nav-dropdown-menu a:hover {
    background: rgba(180, 160, 130, 0.1);
    color: var(--accent);
}

/* Hamburger */
.hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.4rem;
    flex-direction: column;
    gap: 5px;
    z-index: 1002;
}
.hamburger span {
    display: block;
    width: 24px;
    height: 2.5px;
    background: var(--nav-text);
    border-radius: 2px;
    transition: all 0.3s;
}
.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* Mobile menu */
.mobile-menu {
    display: none;
    position: fixed;
    top: 58px;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--nav-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    z-index: 999;
    padding: 1rem;
    overflow-y: auto;
    flex-direction: column;
    gap: 0.25rem;
}
.mobile-menu.active { display: flex; }
.mobile-menu a {
    display: block;
    padding: 0.7rem 1rem;
    font-size: 1rem;
    font-weight: 500;
    color: var(--nav-text);
    text-decoration: none;
    border-radius: 10px;
    transition: background 0.2s;
}
.mobile-menu a:hover,
.mobile-menu a.active {
    background: rgba(180, 160, 130, 0.12);
    color: var(--accent);
}
.mobile-menu .mobile-divider { height: 1px; background: var(--border); margin: 0.4rem 0; }
.mobile-menu .mobile-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--text-light);
    padding: 0.5rem 1rem 0.2rem;
}

/* ========== PAGE SPECIFIC STYLES (Vol.2) ========== */
.container {
    max-width: 1480px;
    width: 100%;
    margin: 0 auto;
    padding: 2.2rem 1.8rem;
}

header {
    text-align: center;
    margin-bottom: 2.8rem;
}

.header-badge {
    display: inline-block;
    background: #e8e0d3;
    color: #5c5549;
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    padding: 0.35rem 1.4rem;
    border-radius: 30px;
    margin-bottom: 0.9rem;
}

@media (prefers-color-scheme: dark) {
    .header-badge {
        background: #3d3830;
        color: #cbc0ae;
    }
}

h1 {
    font-size: 2.8rem;
    font-weight: 520;
    letter-spacing: 1.5px;
    color: #3d3830;
    margin-bottom: 0.3rem;
}

.subtitle {
    font-size: 1rem;
    color: var(--text-light);
    font-weight: 360;
    border-bottom: 1.5px solid #e0d8c8;
    display: inline-block;
    padding-bottom: 0.55rem;
    padding-left: 1rem;
    padding-right: 1rem;
    letter-spacing: 0.3px;
}

.palette-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(335px, 1fr));
    gap: 2rem;
    margin-top: 0.5rem;
}

.palette-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow), 0 2px 8px rgba(0, 0, 0, 0.02);
    overflow: hidden;
    transition: transform var(--transition), box-shadow 0.35s ease;
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border);
}

.palette-card:hover {
    transform: translateY(-7px);
    box-shadow: 0 22px 44px rgba(0, 0, 0, 0.07), 0 6px 16px rgba(0, 0, 0, 0.04);
}

.color-strip {
    display: flex;
    width: 100%;
    height: 115px;
    cursor: pointer;
}

.color-swatch {
    flex: 1;
    position: relative;
    transition: filter 0.22s, transform 0.18s;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding-bottom: 7px;
}

.color-swatch:hover {
    filter: brightness(0.9);
    transform: scaleY(1.04);
    z-index: 2;
    box-shadow: 0 6px 14px rgba(0, 0, 0, 0.12);
}

.swatch-hex {
    font-size: 0.68rem;
    font-weight: 520;
    color: rgba(255, 255, 255, 0.92);
    background: rgba(20, 20, 20, 0.38);
    padding: 3px 9px;
    border-radius: 18px;
    letter-spacing: 0.4px;
    backdrop-filter: blur(4px);
    opacity: 0;
    transition: opacity 0.22s;
    pointer-events: none;
    white-space: nowrap;
}

.color-swatch:hover .swatch-hex {
    opacity: 1;
}

.swatch-hex.light-text {
    color: rgba(35, 35, 35, 0.88);
    background: rgba(255, 255, 255, 0.72);
}

.palette-info {
    padding: 1.3rem 1.3rem 1.1rem 1.3rem;
    background: var(--card-bg);
}

.palette-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.8rem;
}

.palette-name {
    font-weight: 630;
    font-size: 1.15rem;
    letter-spacing: 0.25px;
    color: #35312a;
}

.copy-group-btn {
    background: #f4f0e9;
    border: none;
    padding: 0.45rem 1.05rem;
    border-radius: 28px;
    font-size: 0.76rem;
    font-weight: 500;
    color: #534d43;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.35rem;
    transition: all 0.25s;
    border: 0.5px solid #d9d0be;
    letter-spacing: 0.3px;
    background: #faf7f2;
}

.copy-group-btn:hover {
    background: #e7dfd2;
    border-color: #c4b69e;
    color: #2e2920;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
}

.color-names {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem 0.65rem;
    align-items: center;
}

.color-tag {
    font-size: 0.74rem;
    background: #f7f4ee;
    color: #524d44;
    padding: 0.32rem 0.85rem;
    border-radius: 28px;
    font-weight: 440;
    letter-spacing: 0.2px;
    white-space: nowrap;
    border: 0.5px solid #e6dfd0;
    display: inline-flex;
    align-items: center;
    transition: all 0.2s;
    cursor: pointer;
}

.color-tag:hover {
    background: #ebe4d6;
    border-color: #cbbfa9;
    transform: translateY(-1px);
}

.dot {
    display: inline-block;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    margin-right: 7px;
    opacity: 0.88;
    box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.04);
}

.footer-note {
    margin-top: 3.2rem;
    text-align: center;
    color: #a39b8c;
    font-size: 0.88rem;
    font-weight: 350;
    border-top: 1px solid #e2dbce;
    padding-top: 1.8rem;
    width: 100%;
    max-width: 620px;
    letter-spacing: 0.3px;
}

.toast-message {
    position: fixed;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    background: #2d2a25;
    color: #f3efe6;
    padding: 0.7rem 2.1rem;
    border-radius: 50px;
    font-size: 0.88rem;
    font-weight: 460;
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.18);
    z-index: 999;
    opacity: 0;
    transition: opacity 0.28s ease;
    pointer-events: none;
    white-space: nowrap;
    letter-spacing: 0.3px;
}
.toast-message.show { opacity: 1; }

/* Dark mode overrides for page specific elements */
@media (prefers-color-scheme: dark) {
    .palette-name { color: #ede5d9; }
    .color-tag { background: #3a3530; color: #dbd3c5; border-color: #524b40; }
    .color-tag:hover { background: #4a443c; border-color: #7a7060; }
    .copy-group-btn { background: #3b362f; border-color: #5b5346; color: #d9d0c0; }
    .copy-group-btn:hover { background: #50493e; color: #f0e8d8; }
    h1 { color: #e6ddcd; }
    .subtitle { color: #b7ae9c; border-bottom-color: #5e5648; }
    .footer-note { color: #9b9282; border-top-color: #4e4639; }
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .hamburger { display: flex; }
    .container { padding: 1.5rem 1rem; }
    h1 { font-size: 2.2rem; }
    .palette-grid { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1.4rem; }
}
@media (min-width: 769px) {
    .mobile-menu { display: none !important; }
}