/* ============================================
   SPER Chemical Corporation — Landing Page
   Liquid Industrial Design — Full Spectacle
   ============================================ */

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

:root {
    --blue-950: #091e36;
    --blue-900: #0f2b46;
    --blue-800: #1a3a5c;
    --blue-700: #1e4d7b;
    --blue-600: #2563eb;
    --sky-500: #0ea5e9;
    --sky-400: #38bdf8;
    --sky-300: #7dd3fc;
    --sky-100: #e0f2fe;
    --sky-50: #f0f9ff;
    --white: #ffffff;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    --green-500: #22c55e;
    --green-100: #dcfce7;
    --amber-500: #f59e0b;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --shadow-sm: 0 1px 3px rgba(15,43,70,0.06), 0 1px 2px rgba(15,43,70,0.04);
    --shadow-md: 0 4px 16px rgba(15,43,70,0.08);
    --shadow-lg: 0 12px 40px rgba(15,43,70,0.10);
    --shadow-xl: 0 20px 60px rgba(15,43,70,0.14);
    --font-display: 'DM Serif Display', Georgia, serif;
    --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
    font-family: var(--font-body);
    color: var(--gray-800);
    line-height: 1.6;
    background: var(--white);
    overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; transition: var(--transition); }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ===== SECTION COMMON ===== */
.section-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--sky-500);
    margin-bottom: 12px;
}
.section-eyebrow::before {
    content: '';
    width: 24px;
    height: 2px;
    background: var(--sky-500);
}
.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 2.8rem);
    font-weight: 400;
    line-height: 1.2;
    color: var(--blue-900);
    margin-bottom: 16px;
}
.section-subtitle {
    font-size: 1.05rem;
    color: var(--gray-500);
    line-height: 1.7;
    max-width: 600px;
}
.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 64px;
}
.section-header .section-subtitle { margin: 0 auto; }

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 13px 28px;
    border-radius: var(--radius-sm);
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 0.9rem;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}
.btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(120deg, transparent 30%, rgba(255,255,255,0.2) 50%, transparent 70%);
    transform: translateX(-100%);
    transition: transform 0.6s ease;
}
.btn:hover::after { transform: translateX(100%); }

.btn-primary {
    background: linear-gradient(135deg, var(--sky-500), #0284c7);
    color: var(--white);
    box-shadow: 0 4px 20px rgba(14,165,233,0.3);
}
.btn-primary:hover {
    box-shadow: 0 8px 32px rgba(14,165,233,0.45);
    transform: translateY(-2px);
}
.btn-outline {
    background: transparent;
    color: var(--white);
    border: 1.5px solid rgba(255,255,255,0.3);
}
.btn-outline:hover {
    border-color: var(--white);
    background: rgba(255,255,255,0.1);
    transform: translateY(-2px);
}
.btn-outline-dark {
    background: transparent;
    color: var(--blue-800);
    border: 1.5px solid var(--gray-200);
}
.btn-outline-dark:hover {
    border-color: var(--sky-500);
    color: var(--sky-500);
    transform: translateY(-2px);
}
.btn-lg { padding: 16px 36px; font-size: 0.95rem; }
.btn svg {
    width: 16px; height: 16px;
    transition: transform 0.3s ease;
    position: relative; z-index: 2;
}
.btn:hover svg { transform: translateX(3px); }
.btn span { position: relative; z-index: 2; }

/* ===== NAVBAR ===== */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    padding: 20px 0;
    transition: all 0.4s ease;
}
.navbar.scrolled {
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(24px);
    border-bottom: 1px solid rgba(14,165,233,0.08);
    padding: 12px 0;
    box-shadow: 0 4px 30px rgba(15,43,70,0.06);
}
.navbar-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.logo {
    display: flex;
    align-items: center;
    z-index: 1001;
}
.logo-img {
    height: 44px;
    width: auto;
    transition: filter 0.4s ease;
    filter: brightness(0) invert(1);
}
.navbar.scrolled .logo-img {
    filter: none;
}
.logo-img-footer {
    height: 50px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 36px;
}
.nav-links a {
    font-size: 0.88rem;
    font-weight: 500;
    color: rgba(255,255,255,0.75);
    position: relative;
}
.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px; left: 0;
    width: 0; height: 2px;
    background: var(--sky-400);
    transition: width 0.3s ease;
}
.nav-links a:hover { color: var(--white); }
.nav-links a:hover::after { width: 100%; }
.navbar.scrolled .nav-links a { color: var(--gray-500); }
.navbar.scrolled .nav-links a:hover { color: var(--blue-900); }
.navbar.scrolled .nav-links a::after { background: var(--sky-500); }

.nav-cta {
    padding: 10px 22px !important;
    background: var(--sky-500);
    color: var(--white) !important;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.85rem;
}
.nav-cta::after { display: none; }
.nav-cta:hover { background: var(--sky-400); color: var(--white) !important; }

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    z-index: 1001;
}
.mobile-toggle span {
    width: 22px; height: 2px;
    background: var(--white);
    transition: all 0.3s ease;
    border-radius: 2px;
}
.navbar.scrolled .mobile-toggle span { background: var(--blue-900); }

/* ===== HERO ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(165deg, var(--blue-950) 0%, var(--blue-800) 40%, var(--blue-700) 100%);
    overflow: hidden;
    padding: 120px 0 0;
}

/* Animated water caustics overlay */
.hero-caustics {
    position: absolute;
    inset: 0;
    opacity: 0.06;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(14,165,233,0.5) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(56,189,248,0.4) 0%, transparent 40%),
        radial-gradient(ellipse at 60% 80%, rgba(14,165,233,0.3) 0%, transparent 45%);
    animation: causticsDrift 12s ease-in-out infinite alternate;
}
@keyframes causticsDrift {
    0% { transform: scale(1) translate(0, 0); opacity: 0.06; }
    50% { transform: scale(1.05) translate(-10px, 5px); opacity: 0.08; }
    100% { transform: scale(1) translate(10px, -5px); opacity: 0.05; }
}

.hero-grid-pattern {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
    background-size: 64px 64px;
    mask-image: linear-gradient(to bottom, transparent, black 20%, black 60%, transparent);
    -webkit-mask-image: linear-gradient(to bottom, transparent, black 20%, black 60%, transparent);
}

/* Falling water drops */
.hero-drops {
    position: absolute;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
}
.drop {
    position: absolute;
    width: 3px;
    background: linear-gradient(to bottom, transparent, rgba(125,211,252,0.6), transparent);
    border-radius: 50% 50% 50% 50% / 60% 60% 40% 40%;
    animation: dropFall linear infinite;
    opacity: 0;
}
@keyframes dropFall {
    0% { transform: translateY(-20px); opacity: 0; }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% { transform: translateY(100vh); opacity: 0; }
}
.drop:nth-child(1) { left: 8%; height: 30px; animation-duration: 4s; animation-delay: 0s; }
.drop:nth-child(2) { left: 18%; height: 22px; animation-duration: 3.2s; animation-delay: 1.5s; }
.drop:nth-child(3) { left: 32%; height: 35px; animation-duration: 4.5s; animation-delay: 0.8s; }
.drop:nth-child(4) { left: 45%; height: 18px; animation-duration: 3s; animation-delay: 2.2s; }
.drop:nth-child(5) { left: 55%; height: 28px; animation-duration: 3.8s; animation-delay: 0.3s; }
.drop:nth-child(6) { left: 68%; height: 24px; animation-duration: 4.2s; animation-delay: 1.8s; }
.drop:nth-child(7) { left: 78%; height: 32px; animation-duration: 3.5s; animation-delay: 0.6s; }
.drop:nth-child(8) { left: 88%; height: 20px; animation-duration: 4s; animation-delay: 2.5s; }
.drop:nth-child(9) { left: 25%; height: 26px; animation-duration: 3.6s; animation-delay: 3s; }
.drop:nth-child(10) { left: 72%; height: 22px; animation-duration: 4.3s; animation-delay: 1.2s; }
.drop:nth-child(11) { left: 12%; height: 16px; animation-duration: 3.4s; animation-delay: 3.5s; }
.drop:nth-child(12) { left: 92%; height: 28px; animation-duration: 3.7s; animation-delay: 0.9s; }

/* Floating water molecules */
.hero-molecules {
    position: absolute;
    inset: 0;
    pointer-events: none;
}
.molecule {
    position: absolute;
    opacity: 0.08;
    animation: moleculeFloat 20s ease-in-out infinite;
}
.molecule:nth-child(1) { top: 15%; right: 10%; animation-delay: 0s; }
.molecule:nth-child(2) { top: 60%; right: 25%; animation-delay: -7s; animation-duration: 25s; }
.molecule:nth-child(3) { top: 35%; right: 5%; animation-delay: -14s; animation-duration: 22s; }
@keyframes moleculeFloat {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    25% { transform: translate(-15px, 20px) rotate(10deg); }
    50% { transform: translate(10px, -15px) rotate(-5deg); }
    75% { transform: translate(-10px, -10px) rotate(8deg); }
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 720px;
    padding-bottom: 80px;
}

.hero-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    background: rgba(14,165,233,0.12);
    border: 1px solid rgba(14,165,233,0.2);
    border-radius: var(--radius-sm);
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--sky-400);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 28px;
    animation: labelReveal 0.8s var(--ease-out) 0.3s both;
}
.hero-label svg { width: 14px; height: 14px; }

@keyframes labelReveal {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.4rem, 5vw, 3.6rem);
    font-weight: 400;
    line-height: 1.12;
    color: var(--white);
    margin-bottom: 24px;
    animation: titleReveal 1s var(--ease-out) 0.5s both;
}
.hero-title em {
    font-style: normal;
    background: linear-gradient(135deg, var(--sky-300), var(--sky-400));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

@keyframes titleReveal {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

.hero-subtitle {
    font-size: 1.1rem;
    color: rgba(255,255,255,0.6);
    line-height: 1.7;
    margin-bottom: 36px;
    max-width: 560px;
    animation: subtitleReveal 1s var(--ease-out) 0.7s both;
}

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

.hero-cta {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    animation: ctaReveal 1s var(--ease-out) 0.9s both;
}

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

/* Hero illustration */
.hero-visual {
    position: absolute;
    right: 40px;
    bottom: 120px;
    width: 380px;
    height: 380px;
    z-index: 1;
    opacity: 0.25;
    animation: heroVisualFloat 8s ease-in-out infinite;
    border-radius: 50%;
    overflow: hidden;
    border: 2px solid rgba(56,189,248,0.2);
    box-shadow: 0 0 80px rgba(14,165,233,0.15), inset 0 0 40px rgba(0,0,0,0.3);
}
.hero-visual img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
@keyframes heroVisualFloat {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(3deg); }
}

/* Stats */
.hero-stats {
    position: relative;
    z-index: 4;
    margin-top: auto;
    padding-bottom: 40px;
}
.hero-stats-bar {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    border-top: 1px solid rgba(255,255,255,0.08);
    animation: statsReveal 1s var(--ease-out) 1.1s both;
}
@keyframes statsReveal {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.hero-stat {
    padding: 28px 32px;
    border-right: 1px solid rgba(255,255,255,0.08);
    text-align: center;
    transition: background 0.3s ease;
}
.hero-stat:last-child { border-right: none; }
.hero-stat:hover { background: rgba(255,255,255,0.03); }

.hero-stat-value {
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--white);
    margin-bottom: 4px;
}
.hero-stat-label {
    font-size: 0.8rem;
    color: rgba(255,255,255,0.85);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    font-weight: 600;
    margin-top: 4px;
}

/* Wave divider */
.wave-divider {
    position: absolute;
    bottom: -2px; left: 0; right: 0;
    z-index: 3;
    line-height: 0;
}
.wave-divider svg { display: block; width: 100%; height: 80px; }

/* ===== ABOUT ===== */
.about {
    padding: 100px 0;
    background: var(--white);
    position: relative;
}

.about-intro {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: start;
    margin-bottom: 80px;
}
.about-text p {
    color: var(--gray-600);
    font-size: 1.02rem;
    line-height: 1.8;
    margin-bottom: 16px;
}
.about-facility-photo {
    margin-top: 24px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--gray-200);
}
.about-facility-photo img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    transition: transform 0.6s ease;
}
.about-facility-photo:hover img {
    transform: scale(1.04);
}
.nsf-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 22px;
    background: linear-gradient(135deg, var(--green-100), #bbf7d0);
    border: 1px solid rgba(34,197,94,0.2);
    border-radius: var(--radius-md);
    margin-top: 8px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.nsf-badge:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(34,197,94,0.15);
}
.nsf-badge svg { flex-shrink: 0; }
.nsf-logo-img {
    width: 36px;
    height: 36px;
    object-fit: contain;
    flex-shrink: 0;
}
.nsf-badge span { font-size: 0.85rem; font-weight: 600; color: #15803d; }

.capability-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.capability-card {
    padding: 0;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
}
.capability-card-photo {
    height: 160px;
    overflow: hidden;
    position: relative;
}
.capability-card-photo::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 40%, rgba(255,255,255,0.9) 100%);
}
.capability-card-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}
.capability-card:hover .capability-card-photo img {
    transform: scale(1.08);
}
.capability-card .capability-icon,
.capability-card h3,
.capability-card p {
    padding-left: 28px;
    padding-right: 28px;
}
.capability-card .capability-icon {
    margin-top: -28px;
    position: relative;
    z-index: 2;
}
.capability-card h3 { margin-top: 0; }
.capability-card p { padding-bottom: 32px; }
.capability-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--sky-500), var(--sky-300));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}
.capability-card:hover::before { transform: scaleX(1); }
.capability-card:hover {
    border-color: transparent;
    box-shadow: var(--shadow-xl);
    transform: translateY(-6px);
}
.capability-icon {
    width: 56px; height: 56px;
    display: flex; align-items: center; justify-content: center;
    background: linear-gradient(135deg, var(--sky-100), var(--sky-50));
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    color: var(--sky-500);
    transition: all 0.3s ease;
}
.capability-card:hover .capability-icon {
    background: linear-gradient(135deg, var(--sky-500), #0284c7);
    color: var(--white);
    transform: scale(1.05);
}
.capability-card h3 {
    font-family: var(--font-display);
    font-size: 1.2rem;
    color: var(--blue-900);
    margin-bottom: 10px;
}
.capability-card p {
    font-size: 0.9rem;
    color: var(--gray-500);
    line-height: 1.7;
}

/* ===== INDUSTRIES ===== */
.industries {
    padding: 100px 0;
    background: var(--gray-50);
    position: relative;
    overflow: hidden;
}

/* Water ring bg decoration */
.industries-bg-ring {
    position: absolute;
    width: 600px; height: 600px;
    border-radius: 50%;
    border: 1px solid rgba(14,165,233,0.06);
    top: -200px; right: -200px;
    pointer-events: none;
}
.industries-bg-ring::after {
    content: '';
    position: absolute;
    inset: 40px;
    border-radius: 50%;
    border: 1px solid rgba(14,165,233,0.04);
}

.industries-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}
.industry-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all 0.4s var(--ease-out);
}
.industry-card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-8px);
    border-color: transparent;
}
.industry-visual {
    height: 220px;
    display: flex; align-items: center; justify-content: center;
    background: linear-gradient(135deg, var(--blue-900), var(--blue-700));
    position: relative;
    overflow: hidden;
}
.industry-visual::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 30% 70%, rgba(14,165,233,0.2), transparent 60%);
}
.industry-visual svg { position: relative; z-index: 1; }
.industry-visual-photo {
    background: var(--blue-900);
}
.industry-visual-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    position: relative;
    z-index: 0;
    transition: transform 0.6s ease;
    opacity: 0.85;
}
.industry-card:hover .industry-visual-photo img {
    transform: scale(1.06);
    opacity: 1;
}

/* Water shimmer on industry cards */
.industry-visual::after {
    content: '';
    position: absolute;
    top: -50%; left: -50%;
    width: 200%; height: 200%;
    background: linear-gradient(45deg, transparent 40%, rgba(255,255,255,0.05) 50%, transparent 60%);
    animation: waterShimmer 6s ease-in-out infinite;
}
@keyframes waterShimmer {
    0%, 100% { transform: translate(-30%, -30%) rotate(0deg); }
    50% { transform: translate(30%, 30%) rotate(5deg); }
}

.industry-body { padding: 28px; }
.industry-card h3 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    color: var(--blue-900);
    margin-bottom: 12px;
}
.industry-card > .industry-body > p {
    font-size: 0.9rem;
    color: var(--gray-500);
    line-height: 1.7;
    margin-bottom: 16px;
}
.industry-features {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 20px;
}
.industry-features li {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    color: var(--gray-600);
}
.industry-features li svg { flex-shrink: 0; color: var(--sky-500); }

.industry-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--sky-500);
    transition: gap 0.3s ease;
}
.industry-link:hover { gap: 12px; }

/* ===== PRODUCTS ===== */
.products {
    padding: 100px 0;
    background: var(--white);
    position: relative;
    overflow: hidden;
}
.products-bg-molecule {
    position: absolute;
    top: -60px;
    right: -120px;
    width: 450px;
    height: 450px;
    opacity: 0.06;
    pointer-events: none;
    z-index: 0;
}
.products-bg-molecule img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
}
.products .container { position: relative; z-index: 1; }
.product-tabs {
    display: flex;
    justify-content: center;
    gap: 4px;
    margin-bottom: 48px;
    background: var(--gray-100);
    border-radius: var(--radius-sm);
    padding: 4px;
    width: fit-content;
    margin-left: auto;
    margin-right: auto;
}
.product-tab {
    padding: 10px 24px;
    border-radius: var(--radius-sm);
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--gray-500);
    cursor: pointer;
    border: none;
    background: transparent;
    font-family: var(--font-body);
    transition: all 0.3s ease;
}
.product-tab.active {
    background: var(--white);
    color: var(--blue-900);
    box-shadow: var(--shadow-sm);
}
.product-tab:hover:not(.active) { color: var(--blue-800); }

.product-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 48px;
}
.product-card {
    padding: 28px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    transition: all 0.4s ease;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}
.product-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 0% 0%, rgba(14,165,233,0.04), transparent 50%);
    opacity: 0;
    transition: opacity 0.4s ease;
}
.product-card:hover::before { opacity: 1; }
.product-card:hover {
    border-color: rgba(14,165,233,0.2);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}
.product-card-header {
    display: flex;
    align-items: start;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 14px;
    position: relative;
}
.product-badge {
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    flex-shrink: 0;
}
.badge-nsf { background: var(--green-100); color: #15803d; }
.badge-nonpotable { background: #fef3c7; color: #92400e; }

.product-card h3 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    color: var(--blue-900);
    line-height: 1.3;
    position: relative;
}
.product-card p {
    font-size: 0.88rem;
    color: var(--gray-500);
    line-height: 1.6;
    flex: 1;
    position: relative;
}
.product-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--sky-500);
    margin-top: 16px;
    position: relative;
    transition: gap 0.3s ease;
}
.product-link:hover { gap: 12px; }

.products-cta { text-align: center; }

/* ===== WHY SPER ===== */
.why-sper {
    padding: 100px 0;
    background: linear-gradient(165deg, var(--blue-950), var(--blue-800));
    position: relative;
    overflow: hidden;
}

/* Animated bubble particles */
.why-sper-bubbles {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
}
.bubble {
    position: absolute;
    border-radius: 50%;
    border: 1px solid rgba(14,165,233,0.15);
    background: rgba(14,165,233,0.03);
    animation: bubbleRise linear infinite;
}
@keyframes bubbleRise {
    0% { transform: translateY(100%) scale(0.5); opacity: 0; }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% { transform: translateY(-100vh) scale(1); opacity: 0; }
}
.bubble:nth-child(1) { width: 20px; height: 20px; left: 5%; animation-duration: 12s; animation-delay: 0s; }
.bubble:nth-child(2) { width: 14px; height: 14px; left: 15%; animation-duration: 10s; animation-delay: 2s; }
.bubble:nth-child(3) { width: 24px; height: 24px; left: 30%; animation-duration: 14s; animation-delay: 4s; }
.bubble:nth-child(4) { width: 10px; height: 10px; left: 50%; animation-duration: 9s; animation-delay: 1s; }
.bubble:nth-child(5) { width: 18px; height: 18px; left: 65%; animation-duration: 11s; animation-delay: 3s; }
.bubble:nth-child(6) { width: 12px; height: 12px; left: 80%; animation-duration: 13s; animation-delay: 5s; }
.bubble:nth-child(7) { width: 16px; height: 16px; left: 92%; animation-duration: 10s; animation-delay: 2.5s; }
.bubble:nth-child(8) { width: 22px; height: 22px; left: 42%; animation-duration: 15s; animation-delay: 6s; }

.why-sper .section-title { color: var(--white); }
.why-sper .section-eyebrow { color: var(--sky-400); }
.why-sper .section-eyebrow::before { background: var(--sky-400); }
.why-sper .section-subtitle { color: rgba(255,255,255,0.5); }

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 80px;
    position: relative;
    z-index: 2;
}
.feature-item {
    display: flex;
    align-items: start;
    gap: 16px;
    padding: 24px;
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: var(--radius-md);
    transition: all 0.4s ease;
}
.feature-item:hover {
    background: rgba(14,165,233,0.08);
    border-color: rgba(14,165,233,0.2);
    transform: translateY(-3px);
}
.feature-icon {
    width: 44px; height: 44px;
    display: flex; align-items: center; justify-content: center;
    background: rgba(14,165,233,0.12);
    border-radius: var(--radius-sm);
    flex-shrink: 0;
    color: var(--sky-400);
    transition: all 0.3s ease;
}
.feature-item:hover .feature-icon {
    background: var(--sky-500);
    color: var(--white);
}
.feature-item h4 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 4px;
}
.feature-item p {
    font-size: 0.82rem;
    color: rgba(255,255,255,0.4);
    line-height: 1.5;
}

/* Testimonials */
.why-sper-showcase {
    margin: 48px 0;
    position: relative;
    z-index: 2;
}
.showcase-photo {
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: 0 8px 40px rgba(0,0,0,0.3);
    position: relative;
    max-width: 700px;
    margin: 0 auto;
}
.showcase-photo img {
    width: 100%;
    height: auto;
    display: block;
}
.showcase-label {
    position: absolute;
    bottom: 0; left: 0; right: 0;
    display: flex;
    justify-content: space-between;
    padding: 16px 32px;
    background: linear-gradient(180deg, transparent, rgba(0,0,0,0.6));
}
.showcase-label span {
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: rgba(255,255,255,0.9);
}

.testimonials-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    position: relative;
    z-index: 2;
}
.testimonial-card {
    padding: 28px;
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-md);
    transition: all 0.4s ease;
}
.testimonial-card:hover {
    background: rgba(255,255,255,0.07);
    transform: translateY(-4px);
}
.testimonial-stars {
    color: var(--amber-500);
    font-size: 0.85rem;
    letter-spacing: 2px;
    margin-bottom: 14px;
}
.testimonial-text {
    font-size: 0.92rem;
    color: rgba(255,255,255,0.7);
    line-height: 1.7;
    font-style: italic;
    margin-bottom: 18px;
}
.testimonial-author { font-size: 0.82rem; color: rgba(255,255,255,0.4); }
.testimonial-author strong {
    display: block;
    color: rgba(255,255,255,0.7);
    font-style: normal;
    margin-bottom: 2px;
}

/* ===== RESOURCES ===== */
.resources {
    padding: 100px 0;
    background: var(--gray-50);
}
.resources-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}
.resource-card {
    padding: 36px 32px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
}
.resource-card::before {
    content: '';
    position: absolute;
    bottom: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--sky-500), var(--sky-300));
    transform: scaleX(0);
    transition: transform 0.4s ease;
}
.resource-card:hover::before { transform: scaleX(1); }
.resource-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-6px);
    border-color: transparent;
}
.resource-card-photo {
    height: 140px;
    overflow: hidden;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    margin: -36px -32px 20px;
    position: relative;
}
.resource-card-photo::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 30%, rgba(255,255,255,0.95) 100%);
}
.resource-card-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}
.resource-card:hover .resource-card-photo img {
    transform: scale(1.05);
}
.resource-icon {
    width: 60px; height: 60px;
    display: flex; align-items: center; justify-content: center;
    background: linear-gradient(135deg, var(--sky-100), var(--sky-50));
    border-radius: var(--radius-md);
    margin: 0 auto 20px;
    color: var(--sky-500);
    transition: all 0.3s ease;
}
.resource-card:hover .resource-icon {
    background: linear-gradient(135deg, var(--sky-500), #0284c7);
    color: var(--white);
    transform: scale(1.1) rotate(-3deg);
}
.resource-card h3 {
    font-family: var(--font-display);
    font-size: 1.15rem;
    color: var(--blue-900);
    margin-bottom: 10px;
}
.resource-card p {
    font-size: 0.88rem;
    color: var(--gray-500);
    line-height: 1.6;
    margin-bottom: 18px;
}
.resource-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--sky-500);
    transition: gap 0.3s ease;
}
.resource-link:hover { gap: 12px; }

/* ===== CONTACT ===== */
.contact {
    padding: 100px 0;
    background: var(--white);
    position: relative;
}
.contact-grid {
    display: grid;
    grid-template-columns: 1.3fr 0.7fr;
    gap: 48px;
}
.contact-form {
    padding: 40px;
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    position: relative;
    overflow: hidden;
}
.contact-form::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--sky-500), var(--sky-300), var(--sky-500));
    background-size: 200% 100%;
    animation: shimmerBar 3s ease-in-out infinite;
}
@keyframes shimmerBar {
    0% { background-position: 100% 0; }
    100% { background-position: -100% 0; }
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}
.form-group { margin-bottom: 14px; }
.form-group label {
    display: block;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 6px;
}
.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    background: var(--white);
    border: 1.5px solid var(--gray-200);
    border-radius: var(--radius-sm);
    color: var(--gray-800);
    font-family: var(--font-body);
    font-size: 0.9rem;
    transition: all 0.3s ease;
    outline: none;
}
.form-group input::placeholder,
.form-group textarea::placeholder { color: var(--gray-400); }
.form-group select {
    appearance: none;
    cursor: pointer;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--sky-500);
    box-shadow: 0 0 0 4px rgba(14,165,233,0.1);
}
.form-group textarea { resize: vertical; min-height: 100px; }
.form-submit { margin-top: 8px; }
.form-success {
    display: none;
    text-align: center;
    padding: 32px;
    color: #15803d;
    font-weight: 600;
    font-size: 1.05rem;
}
.form-success.show { display: block; }

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 16px;
    padding-top: 12px;
}
.contact-info-card {
    display: flex;
    align-items: start;
    gap: 16px;
    padding: 22px;
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    transition: all 0.3s ease;
}
.contact-info-card:hover {
    border-color: var(--sky-500);
    box-shadow: var(--shadow-md);
    transform: translateX(-4px);
}
.contact-info-icon {
    width: 44px; height: 44px;
    display: flex; align-items: center; justify-content: center;
    background: var(--sky-100);
    border-radius: var(--radius-sm);
    flex-shrink: 0;
    color: var(--sky-500);
}
.contact-info-card h4 { font-size: 0.85rem; font-weight: 600; color: var(--blue-900); margin-bottom: 4px; }
.contact-info-card p { font-size: 0.88rem; color: var(--gray-500); line-height: 1.5; }
.contact-info-card a { color: var(--sky-500); font-weight: 500; }
.contact-info-card a:hover { text-decoration: underline; }

.contact-hours {
    padding: 24px;
    background: linear-gradient(135deg, var(--blue-900), var(--blue-800));
    border-radius: var(--radius-md);
    color: var(--white);
    position: relative;
    overflow: hidden;
}
.contact-hours::before {
    content: '';
    position: absolute;
    top: -50%; right: -30%;
    width: 200px; height: 200px;
    border-radius: 50%;
    background: rgba(14,165,233,0.1);
    pointer-events: none;
}
.contact-hours h4 { font-size: 0.85rem; font-weight: 600; margin-bottom: 8px; }
.contact-hours p { font-size: 0.85rem; color: rgba(255,255,255,0.6); line-height: 1.6; }

/* ===== FOOTER ===== */
.footer {
    padding: 56px 0 28px;
    background: var(--blue-950);
    position: relative;
}
.footer-top {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 64px;
    margin-bottom: 40px;
}
.footer-brand .logo-img-footer {
    height: 50px;
    opacity: 0.9;
}
.footer-tagline {
    color: rgba(255,255,255,0.35);
    font-size: 0.88rem;
    margin-top: 12px;
    line-height: 1.6;
}
.footer-links-group {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}
.footer-links h4 {
    font-size: 0.78rem;
    font-weight: 700;
    color: rgba(255,255,255,0.35);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 14px;
}
.footer-links a {
    display: block;
    color: rgba(255,255,255,0.5);
    font-size: 0.88rem;
    padding: 4px 0;
    transition: all 0.2s ease;
}
.footer-links a:hover { color: var(--sky-400); transform: translateX(4px); }

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 24px;
    border-top: 1px solid rgba(255,255,255,0.06);
}
.footer-bottom p { color: rgba(255,255,255,0.25); font-size: 0.8rem; }
.footer-contact-link { display: flex; gap: 20px; }
.footer-contact-link a { color: rgba(255,255,255,0.35); font-size: 0.82rem; }
.footer-contact-link a:hover { color: var(--sky-400); }

/* ===== SCROLL ANIMATIONS ===== */
[data-animate] {
    opacity: 0;
    transform: translateY(32px);
    transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}
[data-animate="fade-left"] { transform: translateX(-32px); }
[data-animate="fade-right"] { transform: translateX(32px); }
[data-animate="scale"] { transform: scale(0.92); }

[data-animate].visible {
    opacity: 1;
    transform: translateY(0) translateX(0) scale(1);
}

/* ===== DOSAGE CALCULATOR ===== */
.dosage-calc { padding: 100px 0; background: var(--white); }
.calc-tabs {
    display: flex; justify-content: center; gap: 4px;
    background: var(--gray-100); border-radius: var(--radius-md); padding: 4px;
    max-width: 520px; margin: 0 auto 40px;
}
.calc-tab {
    padding: 10px 24px; border-radius: var(--radius-sm); border: none;
    background: transparent; font-family: var(--font-body); font-size: 0.85rem;
    font-weight: 600; color: var(--gray-500); cursor: pointer; transition: var(--transition);
    flex: 1; text-align: center;
}
.calc-tab.active { background: var(--white); color: var(--blue-900); box-shadow: var(--shadow-sm); }
.calc-panel { display: none; }
.calc-panel.active { display: block; }
.calc-card {
    background: var(--gray-50); border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg); padding: 40px;
    position: relative; overflow: hidden;
}
.calc-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
    background: linear-gradient(90deg, var(--sky-500), var(--sky-300));
}
.calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.calc-section-title {
    font-size: 0.85rem; font-weight: 700; text-transform: uppercase;
    letter-spacing: 0.06em; color: var(--sky-500); margin-bottom: 16px;
}
.calc-inputs .form-group { margin-bottom: 16px; }
.calc-inputs .form-group label {
    display: block; font-size: 0.82rem; font-weight: 600;
    color: var(--gray-600); margin-bottom: 6px;
}
.calc-inputs .form-group input,
.calc-inputs .form-group select {
    width: 100%; padding: 10px 14px; border: 1px solid var(--gray-200);
    border-radius: var(--radius-sm); font-family: var(--font-body);
    font-size: 0.9rem; background: var(--white); color: var(--gray-800);
    transition: var(--transition);
}
.calc-inputs .form-group input:focus,
.calc-inputs .form-group select:focus {
    outline: none; border-color: var(--sky-500);
    box-shadow: 0 0 0 4px rgba(14,165,233,0.1);
}
.calc-results {
    display: flex; align-items: center; justify-content: center;
    min-height: 300px;
}
.result-placeholder {
    text-align: center; color: var(--gray-400); padding: 40px;
}
.result-placeholder p { margin-top: 16px; font-size: 0.9rem; line-height: 1.6; }
.lsi-result { text-align: center; width: 100%; }
.lsi-value {
    font-family: var(--font-display); font-size: 4rem; line-height: 1;
    margin-bottom: 8px;
}
.lsi-value.corrosive { color: #e53e3e; }
.lsi-value.balanced { color: var(--green-500); }
.lsi-value.scaling { color: var(--amber-500); }
.lsi-badge {
    display: inline-block; padding: 6px 16px; border-radius: 20px;
    font-size: 0.82rem; font-weight: 700; text-transform: uppercase;
    letter-spacing: 0.04em; margin-bottom: 16px;
}
.lsi-badge.corrosive { background: #fed7d7; color: #c53030; }
.lsi-badge.balanced { background: var(--green-100); color: #276749; }
.lsi-badge.scaling { background: #fefcbf; color: #975a16; }
.lsi-desc { font-size: 0.9rem; color: var(--gray-500); line-height: 1.6; max-width: 300px; margin: 0 auto; }

.dosage-result { width: 100%; }
.dosage-grid {
    display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 16px;
}
.dosage-card {
    background: var(--white); border: 1px solid var(--gray-200);
    border-radius: var(--radius-md); padding: 20px; text-align: center;
}
.dosage-card .dos-label { font-size: 0.75rem; color: var(--gray-400); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 4px; }
.dosage-card .dos-value { font-family: var(--font-display); font-size: 1.8rem; color: var(--blue-900); }
.dosage-card .dos-unit { font-size: 0.8rem; color: var(--gray-500); }
.dosage-note { font-size: 0.8rem; color: var(--gray-400); text-align: center; font-style: italic; }

/* ===== METRIC CONVERTER ===== */
.metric-converter { padding: 100px 0; background: var(--gray-50); }
.converter-tabs {
    display: flex; justify-content: center; gap: 4px;
    background: var(--gray-100); border-radius: var(--radius-md); padding: 4px;
    max-width: 600px; margin: 0 auto 40px;
}
.converter-tab {
    padding: 10px 20px; border-radius: var(--radius-sm); border: none;
    background: transparent; font-family: var(--font-body); font-size: 0.85rem;
    font-weight: 600; color: var(--gray-500); cursor: pointer; transition: var(--transition);
    flex: 1; text-align: center;
}
.converter-tab.active { background: var(--white); color: var(--blue-900); box-shadow: var(--shadow-sm); }
.converter-card {
    background: var(--white); border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg); padding: 48px;
    position: relative; overflow: hidden; max-width: 800px; margin: 0 auto;
}
.converter-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
    background: linear-gradient(90deg, var(--sky-500), var(--sky-300));
}
.converter-panel { display: none; }
.converter-panel.active { display: block; }
.converter-row { display: flex; align-items: flex-end; gap: 20px; justify-content: center; }
.converter-field { flex: 1; max-width: 280px; }
.converter-field label {
    display: block; font-size: 0.82rem; font-weight: 600;
    color: var(--gray-600); margin-bottom: 6px;
}
.converter-field input,
.converter-field select {
    width: 100%; padding: 10px 14px; border: 1px solid var(--gray-200);
    border-radius: var(--radius-sm); font-family: var(--font-body);
    font-size: 0.9rem; background: var(--white); color: var(--gray-800);
    transition: var(--transition); margin-bottom: 8px;
}
.converter-field input:focus,
.converter-field select:focus {
    outline: none; border-color: var(--sky-500);
    box-shadow: 0 0 0 4px rgba(14,165,233,0.1);
}
.conv-output { background: var(--sky-50) !important; font-weight: 600; color: var(--blue-900) !important; }
.converter-swap {
    width: 44px; height: 44px; border-radius: 50%; border: 1px solid var(--gray-200);
    background: var(--sky-50); color: var(--sky-500); font-size: 18px; cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    transition: var(--transition); flex-shrink: 0; margin-bottom: 8px;
}
.converter-swap:hover { background: var(--sky-500); color: var(--white); transform: rotate(180deg); }

/* ===== LITERATURE ===== */
.literature { padding: 100px 0; background: var(--white); }
.literature-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.literature-group-title {
    display: flex; align-items: center; gap: 10px;
    font-family: var(--font-display); font-size: 1.2rem; color: var(--blue-900);
    margin-bottom: 20px; padding-bottom: 12px;
    border-bottom: 2px solid var(--sky-100);
}
.literature-item {
    display: flex; align-items: center; gap: 14px; padding: 16px;
    border: 1px solid var(--gray-200); border-radius: var(--radius-md);
    margin-bottom: 10px; transition: var(--transition); cursor: pointer;
}
.literature-item:hover {
    border-color: var(--sky-400); box-shadow: var(--shadow-md);
    transform: translateX(4px);
}
.lit-icon {
    width: 40px; height: 40px; border-radius: var(--radius-sm);
    display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.lit-icon.blue { background: var(--sky-50); color: var(--sky-500); }
.lit-icon.green { background: var(--green-100); color: var(--green-500); }
.lit-icon.orange { background: #fff7ed; color: #ea580c; }
.lit-icon.red { background: #fef2f2; color: #dc2626; }
.lit-icon.purple { background: #faf5ff; color: #9333ea; }
.lit-icon.pdf { background: #fef2f2; color: #dc2626; }
.lit-info { flex: 1; min-width: 0; }
.lit-info h4 { font-size: 0.9rem; font-weight: 600; color: var(--gray-800); margin-bottom: 2px; }
.lit-info p { font-size: 0.8rem; color: var(--gray-500); line-height: 1.4; }
.lit-meta { font-size: 0.75rem !important; color: var(--gray-400) !important; text-transform: uppercase; letter-spacing: 0.04em; }
.lit-icon.sds { background: #fff7ed; color: #ea580c; }
.lit-product-heading { font-size: 0.85rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; color: var(--sky-500); margin-bottom: 12px; }
.accordion { margin-bottom: 8px; border: 1px solid var(--gray-200); border-radius: var(--radius-md); overflow: hidden; }
.accordion-header {
    display: flex; align-items: center; gap: 10px; padding: 14px 16px;
    font-size: 0.9rem; font-weight: 600; color: var(--blue-900); cursor: pointer;
    background: var(--gray-50); transition: var(--transition); user-select: none;
}
.accordion-header:hover { background: var(--sky-50); }
.accordion-arrow { font-size: 10px; color: var(--gray-400); transition: transform 0.3s ease; display: inline-block; }
.accordion.open .accordion-arrow { transform: rotate(90deg); }
.accordion-count { margin-left: auto; font-size: 0.75rem; font-weight: 500; color: var(--gray-400); }
.accordion-body { max-height: 0; overflow: hidden; transition: max-height 0.35s ease; padding: 0 12px; }
.accordion.open .accordion-body { max-height: 600px; padding: 8px 12px 12px; }
.accordion-body .literature-item { margin-bottom: 6px; padding: 10px 12px; }
.lit-arrow { color: var(--gray-300); flex-shrink: 0; transition: var(--transition); }
.literature-item:hover .lit-arrow { color: var(--sky-500); transform: translateX(4px); }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .calc-grid { grid-template-columns: 1fr; }
    .literature-grid { grid-template-columns: 1fr; }
    .about-intro { grid-template-columns: 1fr; gap: 40px; }
    .industries-grid { grid-template-columns: 1fr; }
    .product-grid { grid-template-columns: repeat(2, 1fr); }
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .testimonials-row { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
    .footer-top { grid-template-columns: 1fr; gap: 40px; }
    .hero-stats-bar { grid-template-columns: repeat(2, 1fr); }
    .hero-stat { border-bottom: 1px solid rgba(255,255,255,0.08); }
    .hero-visual { display: none; }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: fixed;
        top: 0; left: 0; right: 0; bottom: 0;
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 28px;
        z-index: 999;
    }
    .nav-links.open { display: flex; }
    .nav-links a { color: var(--gray-700) !important; font-size: 1.2rem; }
    .nav-links a:hover { color: var(--blue-900) !important; }
    .nav-links a::after { display: none; }
    .mobile-toggle { display: flex; }
    .mobile-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); background: var(--blue-900) !important; }
    .mobile-toggle.active span:nth-child(2) { opacity: 0; }
    .mobile-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); background: var(--blue-900) !important; }

    .hero { padding: 100px 0 0; min-height: auto; }
    .hero-content { padding-bottom: 48px; }
    .capability-cards { grid-template-columns: 1fr; }
    .product-grid { grid-template-columns: 1fr; }
    .features-grid { grid-template-columns: 1fr; }
    .resources-grid { grid-template-columns: 1fr; }
    .calc-tabs, .converter-tabs { max-width: 100%; flex-wrap: wrap; }
    .converter-row { flex-direction: column; align-items: stretch; }
    .converter-field { max-width: 100%; }
    .converter-swap { align-self: center; transform: rotate(90deg); }
    .converter-swap:hover { transform: rotate(270deg); }
    .calc-card, .converter-card { padding: 24px; }
    .dosage-grid { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; }
    .footer-links-group { grid-template-columns: 1fr 1fr; }
    .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
    .drop { display: none; }
    .drop:nth-child(-n+5) { display: block; }
}

@media (max-width: 480px) {
    .container { padding: 0 16px; }
    .hero-stats-bar { grid-template-columns: 1fr 1fr; }
    .footer-links-group { grid-template-columns: 1fr; }
}