/* ============================================
   SakuraChem — Catálogo Digital / Brochure
   Sidebar + Scrollable Content
   ============================================ */

:root {
    --blue: #1a4b8c;
    --blue-deep: #0e2d54;
    --blue-light: #2563a8;
    --blue-pale: #e8f0fa;
    --blue-muted: #6b8db5;
    --orange: #d4652a;
    --orange-warm: #e8783e;
    --orange-pale: #fef3ec;
    --white: #ffffff;
    --off-white: #f7f8fa;
    --gray-50: #fafbfc;
    --gray-100: #f0f2f5;
    --gray-200: #e2e6eb;
    --gray-300: #c8ced6;
    --gray-400: #9ba5b1;
    --gray-500: #6b7785;
    --gray-600: #4a5568;
    --gray-700: #2d3748;
    --gray-800: #1a202c;
    --gray-900: #0f1419;

    --font-display: 'Instrument Serif', Georgia, serif;
    --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;

    --sidebar-w: 264px;
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);

    --shadow-sm: 0 1px 3px rgba(15,20,25,.06);
    --shadow-md: 0 4px 16px rgba(15,20,25,.08);
    --shadow-lg: 0 12px 40px rgba(15,20,25,.10);
}

/* --- Reset --- */
*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
    font-family: var(--font-body);
    color: var(--gray-800);
    background: var(--off-white);
    line-height: 1.65;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
em { font-style: italic; font-family: var(--font-display); color: var(--orange); }

/* ========== SIDEBAR ========== */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-w);
    height: 100vh;
    background: var(--white);
    border-right: 1px solid var(--gray-200);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    z-index: 100;
    overflow-y: auto;
    overflow-x: hidden;
}

.sidebar::-webkit-scrollbar { width: 3px; }
.sidebar::-webkit-scrollbar-thumb { background: var(--gray-300); border-radius: 3px; }

.sidebar__top { padding: 28px 20px 20px; }

/* Brand */
.sidebar__brand {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 6px;
}

.sidebar__logo { width: 36px; height: 36px; flex-shrink: 0; }

.sidebar__brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.sidebar__brand-name { font-weight: 700; font-size: 13px; letter-spacing: 1.5px; color: var(--blue); }
.sidebar__brand-sub { font-weight: 400; font-size: 9px; letter-spacing: 2px; color: var(--blue-muted); }

.sidebar__label {
    font-size: 10.5px;
    font-weight: 600;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--gray-400);
    margin: 20px 0 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--gray-100);
}

/* Sidebar Nav */
.sidebar__nav { display: flex; flex-direction: column; gap: 4px; }

.sidebar__link {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12.5px;
    font-weight: 500;
    color: var(--gray-500);
    padding: 6px 10px;
    border-radius: 6px;
    transition: all 0.2s;
    position: relative;
}

.sidebar__link:hover { color: var(--gray-800); background: var(--gray-50); }

.sidebar__link.is-active {
    color: var(--blue);
    background: var(--blue-pale);
    font-weight: 600;
}

.sidebar__link--cover { margin-bottom: 8px; }

/* Sidebar Groups */
.sidebar__group { margin-top: 12px; }

.sidebar__group-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 0 10px;
    margin-bottom: 6px;
}

.sidebar__group-tag {
    font-size: 9px;
    font-weight: 800;
    letter-spacing: 1px;
    padding: 2px 7px;
    border-radius: 3px;
    color: var(--white);
}

.sidebar__group-tag--obm { background: var(--orange); }
.sidebar__group-tag--wbm { background: var(--blue); }

.sidebar__group-title {
    font-size: 11px;
    font-weight: 600;
    color: var(--gray-600);
    letter-spacing: 0.3px;
}

.sidebar__group .sidebar__link {
    padding-left: 20px;
    font-size: 12px;
}

.sidebar__group .sidebar__link::before {
    content: '';
    position: absolute;
    left: 10px;
    top: 50%;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--gray-300);
    transform: translateY(-50%);
    transition: background 0.2s;
}

.sidebar__group .sidebar__link.is-active::before { background: var(--blue); }
.sidebar__group .sidebar__link:hover::before { background: var(--gray-500); }

/* Sidebar Bottom */
.sidebar__bottom {
    padding: 16px 20px;
    border-top: 1px solid var(--gray-100);
}

.sidebar__arko { text-align: center; }
.sidebar__arko-label { display: block; font-size: 9px; color: var(--gray-400); letter-spacing: 0.5px; margin-bottom: 2px; }
.sidebar__arko-name { font-size: 11px; font-weight: 700; color: var(--blue-muted); letter-spacing: 1.5px; }

/* ========== MOBILE HEADER ========== */
.mobile-header {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0;
    height: 56px;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--gray-200);
    z-index: 90;
    padding: 0 16px;
    align-items: center;
    justify-content: space-between;
}

.mobile-header__brand { display: flex; align-items: center; gap: 8px; }
.mobile-header__logo { width: 28px; height: 28px; }
.mobile-header__name { font-size: 12px; font-weight: 700; letter-spacing: 1.5px; color: var(--blue); }

.mobile-header__toggle {
    width: 40px; height: 40px;
    display: flex; align-items: center; justify-content: center;
    background: none; border: 1px solid var(--gray-200);
    border-radius: 8px; cursor: pointer; color: var(--gray-600);
}

.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.3);
    z-index: 99;
}

/* ========== MAIN CONTENT ========== */
.main {
    margin-left: var(--sidebar-w);
    min-height: 100vh;
}

/* --- Shared Section Styles --- */
.section-label {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.section-label__line {
    width: 28px;
    height: 2px;
    background: var(--orange);
    border-radius: 2px;
}

.section-label__text {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--orange);
}

.section-title {
    font-family: var(--font-body);
    font-size: clamp(26px, 3vw, 36px);
    font-weight: 700;
    color: var(--gray-900);
    letter-spacing: -0.3px;
    line-height: 1.2;
    margin-bottom: 12px;
}

.section-title em { font-family: var(--font-display); font-size: 1.06em; }

.section-desc {
    font-size: 15px;
    color: var(--gray-500);
    line-height: 1.75;
    max-width: 600px;
    margin-bottom: 32px;
}

/* ========== COVER ========== */
.cover {
    position: relative;
    padding: 72px 48px 56px;
    background:
        radial-gradient(ellipse at 80% 30%, rgba(26,75,140,0.05) 0%, transparent 60%),
        radial-gradient(ellipse at 20% 80%, rgba(212,101,42,0.03) 0%, transparent 50%),
        var(--white);
    border-bottom: 1px solid var(--gray-200);
    overflow: hidden;
    min-height: 420px;
    display: flex;
    align-items: center;
}

.cover__bg { position: absolute; inset: 0; pointer-events: none; }
.cover__line {
    position: absolute;
    width: 1px;
    height: 100%;
    background: linear-gradient(to bottom, transparent, var(--gray-200) 30%, var(--gray-200) 70%, transparent);
    opacity: 0.4;
}
.cover__line--1 { left: 25%; }
.cover__line--2 { left: 50%; }
.cover__line--3 { left: 75%; }

.cover__content { position: relative; z-index: 2; max-width: 560px; text-align: center; margin: 0 auto; }

/* Hero Brand */
.cover__hero-brand {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 12px;
    justify-content: center;
}

.cover__hero-logo {
    width: 56px;
    height: 56px;
    flex-shrink: 0;
}

.cover__hero-text {
    display: flex;
    flex-direction: column;
    line-height: 1;
}

.cover__hero-name {
    font-family: var(--font-body);
    font-size: clamp(28px, 3.5vw, 38px);
    font-weight: 800;
    letter-spacing: 3px;
    color: var(--blue-deep);
}

.cover__hero-sub {
    font-family: var(--font-body);
    font-size: clamp(11px, 1.4vw, 14px);
    font-weight: 500;
    letter-spacing: 6px;
    color: var(--blue-muted);
    margin-top: 4px;
}

.cover__hero-divider {
    width: 48px;
    height: 3px;
    background: linear-gradient(90deg, var(--orange), var(--orange-warm));
    border-radius: 2px;
    margin: 0 auto 32px;
}

.cover__badge {
    display: inline-block;
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--blue);
    background: var(--blue-pale);
    padding: 5px 14px;
    border-radius: 100px;
    margin-bottom: 20px;
}

.cover__title {
    font-family: var(--font-body);
    font-size: clamp(30px, 4vw, 42px);
    font-weight: 700;
    color: var(--gray-900);
    line-height: 1.2;
    margin-bottom: 14px;
    letter-spacing: -0.4px;
}
.cover__title em { font-family: var(--font-display); font-size: 1.06em; }

.cover__subtitle {
    font-size: 15px;
    color: var(--gray-500);
    line-height: 1.75;
    margin-bottom: 28px;
}

.cover__stats { display: flex; gap: 32px; justify-content: center; }
.cover__stat { display: flex; align-items: baseline; gap: 6px; }
.cover__stat-num {
    font-size: 32px;
    font-weight: 800;
    color: var(--blue);
    line-height: 1;
    font-variant-numeric: tabular-nums;
}
.cover__stat-text { font-size: 13px; color: var(--gray-400); font-weight: 500; }

/* Cover Molecule */
.cover__molecule {
    position: absolute;
    right: 40px;
    top: 50%;
    transform: translateY(-50%);
    width: 300px;
    height: 300px;
    pointer-events: none;
}

.mol__ring {
    position: absolute;
    top: 50%; left: 50%;
    border-radius: 50%;
    border: 1px solid;
    transform: translate(-50%,-50%);
    animation: molSpin 50s linear infinite;
}
.mol__ring--1 { width: 120px; height: 120px; border-color: rgba(26,75,140,0.1); }
.mol__ring--2 { width: 200px; height: 200px; border-color: rgba(26,75,140,0.06); animation-direction: reverse; }
.mol__ring--3 { width: 280px; height: 280px; border-color: rgba(26,75,140,0.03); }

@keyframes molSpin { from { transform: translate(-50%,-50%) rotate(0deg); } to { transform: translate(-50%,-50%) rotate(360deg); } }

.mol__dot {
    position: absolute;
    border-radius: 50%;
    animation: molPulse 3s ease-in-out infinite;
}
.mol__dot--1 { width: 10px; height: 10px; top: 50%; left: calc(50% + 60px); background: var(--orange); }
.mol__dot--2 { width: 8px; height: 8px; top: calc(50% - 50px); left: calc(50% - 40px); background: var(--blue-light); animation-delay: .7s; }
.mol__dot--3 { width: 12px; height: 12px; top: calc(50% + 70px); left: calc(50% + 40px); background: var(--blue); animation-delay: 1.4s; }
.mol__dot--4 { width: 6px; height: 6px; top: calc(50% - 90px); left: calc(50% + 80px); background: var(--orange-warm); animation-delay: 2.1s; }

@keyframes molPulse {
    0%, 100% { opacity: .3; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.5); }
}

/* ========== CLASSIFICATION ========== */
.classification {
    padding: 56px 48px;
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
}

.class-grid {
    display: flex;
    gap: 0;
    align-items: stretch;
}

.class-card {
    flex: 1;
    background: var(--off-white);
    border: 1px solid var(--gray-200);
    border-radius: 12px;
    padding: 28px 24px;
    transition: all 0.3s var(--ease-out);
}
.class-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }

.class-card__header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--gray-200);
}
.class-card__header h3 { font-size: 16px; font-weight: 700; color: var(--gray-800); }

.class-card__tag {
    font-size: 10px;
    font-weight: 800;
    letter-spacing: 1.5px;
    padding: 3px 10px;
    border-radius: 4px;
    color: var(--white);
}
.class-card--obm .class-card__tag { background: var(--orange); }
.class-card--wbm .class-card__tag { background: var(--blue); }

.class-card__list li {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 7px 0;
    font-size: 13.5px;
    color: var(--gray-600);
}

.dot {
    width: 5px;
    height: 5px;
    border-radius: 50%;
    flex-shrink: 0;
}
.dot--orange { background: var(--orange); }
.dot--blue { background: var(--blue); }

.class-card__count {
    margin-top: 14px;
    padding-top: 12px;
    border-top: 1px solid var(--gray-200);
    font-size: 11px;
    font-weight: 600;
    color: var(--gray-400);
    letter-spacing: 0.5px;
}

.class-divider {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 0 24px;
    flex-shrink: 0;
}
.class-divider__line { width: 1px; flex: 1; background: var(--gray-200); }
.class-divider__label {
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--gray-400);
    writing-mode: vertical-rl;
    padding: 12px 0;
}

/* ========== CATALOG ========== */
.catalog {
    padding: 56px 48px;
}

/* Filters */
.catalog__filters {
    display: flex;
    gap: 8px;
    margin-bottom: 32px;
    position: sticky;
    top: 0;
    background: var(--off-white);
    padding: 12px 0;
    z-index: 10;
    border-bottom: 1px solid var(--gray-100);
}

.filter-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-family: var(--font-body);
    font-size: 12.5px;
    font-weight: 600;
    padding: 8px 18px;
    border: 1.5px solid var(--gray-200);
    border-radius: 100px;
    background: var(--white);
    color: var(--gray-500);
    cursor: pointer;
    transition: all 0.25s var(--ease-out);
}
.filter-btn:hover { border-color: var(--blue); color: var(--blue); }

.filter-btn--active {
    background: var(--blue);
    border-color: var(--blue);
    color: var(--white);
}
.filter-btn--active:hover { background: var(--blue-light); border-color: var(--blue-light); color: var(--white); }

.filter-btn__count {
    font-size: 10px;
    font-weight: 700;
    background: rgba(0,0,0,0.08);
    padding: 1px 6px;
    border-radius: 100px;
}
.filter-btn--active .filter-btn__count { background: rgba(255,255,255,0.2); }

/* Product Cards */
.product {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 12px;
    padding: 0;
    margin-bottom: 16px;
    position: relative;
    overflow: hidden;
    transition: all 0.3s var(--ease-out);
    scroll-margin-top: 80px;
    display: flex;
    align-items: stretch;
}

.product:hover {
    border-color: var(--gray-300);
    box-shadow: var(--shadow-md);
}

.product.is-hidden { display: none; }

/* Left accent */
.product::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 3px;
    height: 0;
    border-radius: 0 0 3px 0;
    transition: height 0.4s var(--ease-out);
    z-index: 2;
}
.product:hover::before { height: 100%; }
.product[data-category="obm"]::before { background: var(--orange); }
.product[data-category="wbm"]::before { background: var(--blue); }

.product__body {
    flex: 1;
    padding: 28px 32px;
    min-width: 0;
}

/* ========== PRODUCT VISUALS ========== */
.product__visual {
    width: 180px;
    min-height: 200px;
    flex-shrink: 0;
    position: relative;
    overflow: hidden;
    border-right: 1px solid var(--gray-100);
}

.product__img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.product__visual .pv__layer {
    position: absolute;
    inset: 0;
}

/* --- AMBER EMULSION (AK SUPRA-MUL) --- */
.pv--amber-emulsion {
    background: linear-gradient(160deg, #f5e6d0 0%, #d4943a 40%, #b8722a 70%, #8b5420 100%);
}
.pv--amber-emulsion .pv__layer--1 {
    background: radial-gradient(circle at 30% 70%, rgba(255,220,150,0.5) 0%, transparent 60%);
}
.pv--amber-emulsion .pv__layer--2 {
    background: radial-gradient(circle at 70% 30%, rgba(180,100,30,0.3) 0%, transparent 50%);
}
.pv--amber-emulsion .pv__drop {
    position: absolute;
    border-radius: 50%;
    background: radial-gradient(circle at 35% 35%, rgba(255,235,200,0.7), rgba(212,148,58,0.4));
    animation: floatDrop 4s ease-in-out infinite;
}
.pv--amber-emulsion .pv__drop--1 { width: 24px; height: 24px; top: 25%; left: 20%; animation-delay: 0s; }
.pv--amber-emulsion .pv__drop--2 { width: 16px; height: 16px; top: 55%; left: 60%; animation-delay: 1.2s; }
.pv--amber-emulsion .pv__drop--3 { width: 12px; height: 12px; top: 70%; left: 35%; animation-delay: 2.4s; }

@keyframes floatDrop {
    0%, 100% { transform: translateY(0) scale(1); opacity: 0.6; }
    50% { transform: translateY(-8px) scale(1.1); opacity: 1; }
}

/* --- AMBER BOTTLE (AK SUPRA-CHEM) --- */
.pv--amber-bottle {
    background: linear-gradient(170deg, #e8c99a 0%, #c8873a 35%, #a0662e 65%, #6b4420 100%);
}
.pv--amber-bottle .pv__layer--1 {
    background: radial-gradient(ellipse at 50% 80%, rgba(255,200,120,0.35) 0%, transparent 60%);
}
.pv--amber-bottle .pv__layer--2 {
    background: linear-gradient(to bottom, rgba(255,255,255,0.06) 0%, transparent 40%);
}
.pv--amber-bottle .pv__shimmer {
    position: absolute;
    top: 0; left: -100%;
    width: 60%; height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.12), transparent);
    animation: shimmer 5s ease-in-out infinite;
}
@keyframes shimmer {
    0%, 100% { left: -60%; }
    50% { left: 100%; }
}

/* --- DARK ASPHALTITE (AK TROL, AK SULFONATED) --- */
.pv--dark-ite {
    background: linear-gradient(160deg, #4a4a4a 0%, #2a2a2a 40%, #1a1a1a 70%, #0d0d0d 100%);
}
.pv--dark-ite .pv__layer--1 {
    background: radial-gradient(circle at 40% 60%, rgba(80,80,80,0.4) 0%, transparent 50%);
}
.pv--dark-ite .pv__layer--2 {
    background: radial-gradient(circle at 70% 30%, rgba(100,100,100,0.2) 0%, transparent 40%);
}
.pv--dark-ite .pv__particle {
    position: absolute;
    border-radius: 50%;
    background: rgba(200,200,200,0.15);
    animation: particleDrift 6s ease-in-out infinite;
}
.pv--dark-ite .pv__particle--1 { width: 5px; height: 5px; top: 20%; left: 30%; animation-delay: 0s; }
.pv--dark-ite .pv__particle--2 { width: 3px; height: 3px; top: 40%; left: 60%; animation-delay: 1s; }
.pv--dark-ite .pv__particle--3 { width: 4px; height: 4px; top: 65%; left: 25%; animation-delay: 2s; }
.pv--dark-ite .pv__particle--4 { width: 6px; height: 6px; top: 50%; left: 70%; animation-delay: 3s; }
.pv--dark-ite .pv__particle--5 { width: 3px; height: 3px; top: 80%; left: 50%; animation-delay: 4s; }

@keyframes particleDrift {
    0%, 100% { transform: translate(0, 0); opacity: 0.2; }
    25% { transform: translate(4px, -6px); opacity: 0.6; }
    50% { transform: translate(-3px, -10px); opacity: 0.8; }
    75% { transform: translate(2px, -4px); opacity: 0.4; }
}

/* --- CLAY POWDER (AK GEL 75) --- */
.pv--clay-powder {
    background: linear-gradient(160deg, #e8dcc8 0%, #c4a87a 40%, #a88e5e 70%, #8a7048 100%);
}
.pv--clay-powder .pv__layer--1 {
    background: radial-gradient(circle at 50% 80%, rgba(232,220,200,0.4) 0%, transparent 50%);
}
.pv--clay-powder .pv__layer--2 {
    background:
        radial-gradient(circle at 20% 30%, rgba(180,150,100,0.3) 0%, transparent 30%),
        radial-gradient(circle at 80% 60%, rgba(160,130,80,0.2) 0%, transparent 30%);
}
.pv--clay-powder .pv__grain {
    position: absolute;
    border-radius: 50%;
    background: rgba(210,190,150,0.5);
    animation: grainFloat 5s ease-in-out infinite;
}
.pv--clay-powder .pv__grain--1 { width: 8px; height: 8px; top: 30%; left: 25%; animation-delay: 0s; }
.pv--clay-powder .pv__grain--2 { width: 5px; height: 5px; top: 50%; left: 65%; animation-delay: 1.2s; }
.pv--clay-powder .pv__grain--3 { width: 6px; height: 6px; top: 70%; left: 40%; animation-delay: 2.5s; }
.pv--clay-powder .pv__grain--4 { width: 4px; height: 4px; top: 20%; left: 70%; animation-delay: 3.5s; }

@keyframes grainFloat {
    0%, 100% { transform: translateY(0); opacity: 0.3; }
    50% { transform: translateY(-6px); opacity: 0.8; }
}

/* --- GOLDEN OIL (AK HYDRALUBE) --- */
.pv--golden-oil {
    background: linear-gradient(160deg, #f5e2b8 0%, #e8b84a 35%, #d4952a 60%, #b87a20 100%);
}
.pv--golden-oil .pv__layer--1 {
    background: radial-gradient(circle at 60% 40%, rgba(255,230,170,0.4) 0%, transparent 50%);
}
.pv--golden-oil .pv__layer--2 {
    background: linear-gradient(to bottom, rgba(255,255,255,0.08) 0%, transparent 50%);
}
.pv--golden-oil .pv__wave {
    position: absolute;
    bottom: 0; left: -20%;
    width: 140%; height: 40%;
    background: rgba(255,240,200,0.15);
    border-radius: 50% 50% 0 0;
    animation: oilWave 6s ease-in-out infinite;
}
@keyframes oilWave {
    0%, 100% { transform: translateX(0) scaleY(1); }
    50% { transform: translateX(5%) scaleY(1.15); }
}

/* --- CLEAR LIQUID (AK SHALE-PRO) --- */
.pv--clear-liquid {
    background: linear-gradient(160deg, #e8f2fa 0%, #c0d8ef 40%, #90b8d8 70%, #6a9cc0 100%);
}
.pv--clear-liquid .pv__layer--1 {
    background: radial-gradient(circle at 50% 50%, rgba(255,255,255,0.25) 0%, transparent 50%);
}
.pv--clear-liquid .pv__layer--2 {
    background: linear-gradient(to bottom right, rgba(255,255,255,0.1) 0%, transparent 60%);
}
.pv--clear-liquid .pv__bubble {
    position: absolute;
    border-radius: 50%;
    border: 1px solid rgba(255,255,255,0.35);
    background: radial-gradient(circle at 35% 35%, rgba(255,255,255,0.25), transparent);
    animation: bubbleRise 5s ease-in-out infinite;
}
.pv--clear-liquid .pv__bubble--1 { width: 18px; height: 18px; bottom: 20%; left: 30%; animation-delay: 0s; }
.pv--clear-liquid .pv__bubble--2 { width: 12px; height: 12px; bottom: 35%; left: 60%; animation-delay: 1.5s; }
.pv--clear-liquid .pv__bubble--3 { width: 8px; height: 8px; bottom: 50%; left: 45%; animation-delay: 3s; }

@keyframes bubbleRise {
    0%, 100% { transform: translateY(0) scale(1); opacity: 0.4; }
    50% { transform: translateY(-16px) scale(1.1); opacity: 0.9; }
}

/* --- CLEAR DROPS (AK SHALE-HIB) --- */
.pv--clear-drops {
    background: linear-gradient(170deg, #dce8f0 0%, #a8c4d8 40%, #7da8c4 70%, #5a8aaa 100%);
}
.pv--clear-drops .pv__layer--1 {
    background: radial-gradient(circle at 40% 40%, rgba(255,255,255,0.2) 0%, transparent 40%);
}
.pv--clear-drops .pv__layer--2 {
    background: radial-gradient(circle at 70% 70%, rgba(100,160,200,0.15) 0%, transparent 40%);
}
.pv--clear-drops .pv__drop {
    position: absolute;
    border-radius: 50%;
    background: radial-gradient(circle at 35% 35%, rgba(255,255,255,0.5), rgba(160,200,220,0.2));
    animation: floatDrop 4.5s ease-in-out infinite;
}
.pv--clear-drops .pv__drop--1 { width: 20px; height: 20px; top: 25%; left: 25%; animation-delay: 0s; }
.pv--clear-drops .pv__drop--2 { width: 14px; height: 14px; top: 55%; left: 55%; animation-delay: 1.5s; }
.pv--clear-drops .pv__drop--3 { width: 10px; height: 10px; top: 75%; left: 35%; animation-delay: 3s; }

/* --- MILKY LIQUID (AK HYPER RATE) --- */
.pv--milky-liquid {
    background: linear-gradient(160deg, #f0f4f8 0%, #d8e2ec 35%, #c0d0de 65%, #a0b4c8 100%);
}
.pv--milky-liquid .pv__layer--1 {
    background: radial-gradient(circle at 50% 50%, rgba(255,255,255,0.4) 0%, transparent 50%);
}
.pv--milky-liquid .pv__layer--2 {
    background: radial-gradient(circle at 30% 70%, rgba(220,230,240,0.3) 0%, transparent 40%);
}
.pv--milky-liquid .pv__swirl {
    position: absolute;
    top: 50%; left: 50%;
    width: 80px; height: 80px;
    transform: translate(-50%, -50%);
    border: 2px solid rgba(255,255,255,0.15);
    border-radius: 50%;
    animation: swirlSpin 8s linear infinite;
}
.pv--milky-liquid .pv__swirl::after {
    content: '';
    position: absolute;
    top: -6px; left: 50%;
    width: 8px; height: 8px;
    border-radius: 50%;
    background: rgba(255,255,255,0.4);
    transform: translateX(-50%);
}
@keyframes swirlSpin { from { transform: translate(-50%,-50%) rotate(0deg); } to { transform: translate(-50%,-50%) rotate(360deg); } }

/* --- BLUE FLUID (AK HYPER RATE MAX) --- */
.pv--blue-fluid {
    background: linear-gradient(160deg, #c0d4e8 0%, #5a8ab0 40%, #3a6a90 70%, #2a4a68 100%);
}
.pv--blue-fluid .pv__layer--1 {
    background: radial-gradient(circle at 40% 50%, rgba(120,170,210,0.3) 0%, transparent 50%);
}
.pv--blue-fluid .pv__layer--2 {
    background: linear-gradient(to bottom, rgba(255,255,255,0.06) 0%, transparent 40%);
}
.pv--blue-fluid .pv__wave {
    position: absolute;
    bottom: 0; left: -20%;
    width: 140%; height: 35%;
    background: rgba(100,160,210,0.15);
    border-radius: 50% 50% 0 0;
    animation: oilWave 7s ease-in-out infinite;
}

/* --- BROWN EARTH (AK LIGNITE NA+) --- */
.pv--brown-earth {
    background: linear-gradient(160deg, #a08060 0%, #7a5a3a 40%, #5a3e28 70%, #3a2818 100%);
}
.pv--brown-earth .pv__layer--1 {
    background: radial-gradient(circle at 50% 60%, rgba(140,100,60,0.3) 0%, transparent 50%);
}
.pv--brown-earth .pv__layer--2 {
    background:
        radial-gradient(circle at 30% 40%, rgba(180,140,90,0.2) 0%, transparent 30%),
        radial-gradient(circle at 75% 70%, rgba(120,80,40,0.2) 0%, transparent 30%);
}
.pv--brown-earth .pv__grain {
    position: absolute;
    border-radius: 40%;
    background: rgba(160,120,70,0.4);
    animation: grainFloat 5.5s ease-in-out infinite;
}
.pv--brown-earth .pv__grain--1 { width: 7px; height: 7px; top: 25%; left: 30%; animation-delay: 0s; }
.pv--brown-earth .pv__grain--2 { width: 4px; height: 4px; top: 45%; left: 65%; animation-delay: 1.4s; }
.pv--brown-earth .pv__grain--3 { width: 6px; height: 5px; top: 65%; left: 40%; animation-delay: 2.8s; }
.pv--brown-earth .pv__grain--4 { width: 3px; height: 3px; top: 80%; left: 55%; animation-delay: 4s; }

/* ========== FOOTER STRIP ========== */
.catalog-footer {
    padding: 24px 48px;
    border-top: 1px solid var(--gray-200);
    background: var(--white);
}

.catalog-footer__inner {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 11.5px;
    color: var(--gray-400);
}

.catalog-footer__sep { color: var(--gray-300); }

/* ========== ANIMATIONS ========== */
.reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* ========== RESPONSIVE ========== */
@media (max-width: 900px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.35s var(--ease-out);
        z-index: 200;
        box-shadow: none;
    }
    .sidebar.is-open {
        transform: translateX(0);
        box-shadow: 8px 0 30px rgba(0,0,0,0.12);
    }

    .sidebar-overlay.is-visible {
        display: block;
    }

    .mobile-header { display: flex; }

    .main {
        margin-left: 0;
        padding-top: 56px;
    }

    .cover, .classification, .catalog { padding: 36px 20px; }

    .cover { min-height: auto; }
    .cover__molecule { display: none; }

    .class-grid { flex-direction: column; }
    .class-divider { flex-direction: row; padding: 16px 0; }
    .class-divider__label { writing-mode: horizontal-tb; }

    .catalog__filters {
        top: 56px;
        padding: 10px 0;
    }

    .product { flex-direction: column; }
    .product__visual {
        width: 100%;
        min-height: 120px;
        height: 120px;
        border-right: none;
        border-bottom: 1px solid var(--gray-100);
    }
    .product__body { padding: 20px; }

    .catalog-footer { padding: 20px; }
}

@media (max-width: 480px) {
    .cover__hero-logo { width: 42px; height: 42px; }
    .cover__hero-brand { gap: 12px; }
    .cover__title { font-size: 26px; }
    .cover__stats { gap: 20px; }
    .cover__stat-num { font-size: 26px; }
    .filter-btn { font-size: 11.5px; padding: 6px 14px; }
}