/* main.css — Preventom public site styles */

/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --primary:       #1e3a5f;
    --primary-light: #2563eb;
    --primary-dark:  #152b47;
    --accent:        #e8b84b;
    --accent-dark:   #c99a2e;
    --success:       #16a34a;
    --danger:        #dc2626;
    --warning:       #d97706;
    --gray-50:       #f9fafb;
    --gray-100:      #f3f4f6;
    --gray-200:      #e5e7eb;
    --gray-400:      #9ca3af;
    --gray-600:      #4b5563;
    --gray-700:      #374151;
    --gray-900:      #111827;
    --white:         #ffffff;
    --radius:        8px;
    --radius-lg:     12px;
    --shadow:        0 1px 3px rgba(0,0,0,.1), 0 1px 2px rgba(0,0,0,.06);
    --shadow-md:     0 4px 6px rgba(0,0,0,.07), 0 2px 4px rgba(0,0,0,.06);
    --shadow-lg:     0 10px 15px rgba(0,0,0,.1), 0 4px 6px rgba(0,0,0,.05);
    --font:          'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --header-h:      72px;
    --transition:    0.2s ease;
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
    font-family: var(--font);
    color: var(--gray-900);
    background: var(--white);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--primary-light); text-decoration: none; }
a:hover { text-decoration: underline; }
ul, ol { list-style: none; }

/* ===== LAYOUT ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.container-wide { max-width: 1400px; margin: 0 auto; padding: 0 24px; }
.section { padding: 80px 0; }
.section-sm { padding: 48px 0; }
.section-title { font-size: clamp(1.75rem, 3vw, 2.5rem); font-weight: 800; color: var(--primary); margin-bottom: 16px; line-height: 1.2; }
.section-subtitle { font-size: 1.125rem; color: var(--gray-600); margin-bottom: 48px; max-width: 600px; }
.text-center { text-align: center; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

/* ===== HEADER ===== */
.site-header {
    position: sticky; top: 0; z-index: 1000;
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    box-shadow: var(--shadow);
    height: var(--header-h);
}
.header-inner {
    display: flex; align-items: center; justify-content: space-between;
    height: var(--header-h);
}
.header-logo img { height: 48px; width: auto; }
.header-nav { display: flex; align-items: center; gap: 8px; }
.nav-link {
    padding: 8px 14px; border-radius: var(--radius);
    font-weight: 500; color: var(--gray-700);
    transition: background var(--transition), color var(--transition);
}
.nav-link:hover, .nav-link.nav-active { background: var(--gray-100); color: var(--primary); text-decoration: none; }
.header-actions { display: flex; align-items: center; gap: 12px; }
.header-cart { position: relative; color: var(--gray-700); padding: 8px; border-radius: var(--radius); transition: background var(--transition); }
.header-cart:hover { background: var(--gray-100); text-decoration: none; }
.cart-count {
    position: absolute; top: 2px; right: 2px;
    background: var(--danger); color: white;
    font-size: 11px; font-weight: 700;
    min-width: 18px; height: 18px;
    border-radius: 99px; display: flex; align-items: center; justify-content: center;
    padding: 0 4px; line-height: 1;
}
.header-btn { padding: 9px 18px; border-radius: var(--radius); font-weight: 600; font-size: 0.875rem; transition: all var(--transition); cursor: pointer; border: none; }
.btn-outline { background: transparent; border: 1.5px solid var(--primary); color: var(--primary); }
.btn-outline:hover { background: var(--primary); color: white; text-decoration: none; }
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-dark); text-decoration: none; }

/* Mobile menu */
.mobile-menu-btn { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 8px; }
.mobile-menu-btn span { display: block; width: 22px; height: 2px; background: var(--gray-700); border-radius: 2px; transition: all var(--transition); }
.mobile-nav { display: none; flex-direction: column; background: white; border-top: 1px solid var(--gray-200); }
.mobile-nav:not([hidden]) { display: flex; }
.mobile-nav-link { padding: 14px 20px; font-weight: 500; color: var(--gray-700); border-bottom: 1px solid var(--gray-100); }
.mobile-nav-link:hover { background: var(--gray-50); text-decoration: none; }
.mobile-nav-auth { display: flex; gap: 12px; padding: 16px 20px; }
.btn-link { background: none; border: none; cursor: pointer; font-size: inherit; }

/* ===== BUTTONS ===== */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 11px 24px; border-radius: var(--radius); font-weight: 600; font-size: 0.9375rem; cursor: pointer; border: none; transition: all var(--transition); text-decoration: none; white-space: nowrap; }
.btn-primary  { background: var(--primary); color: white; }
.btn-primary:hover  { background: var(--primary-dark); color: white; text-decoration: none; }
.btn-accent   { background: var(--accent); color: var(--primary-dark); }
.btn-accent:hover   { background: var(--accent-dark); text-decoration: none; }
.btn-outline  { background: transparent; border: 2px solid var(--primary); color: var(--primary); }
.btn-outline:hover  { background: var(--primary); color: white; text-decoration: none; }
.btn-ghost    { background: transparent; color: var(--primary-light); }
.btn-ghost:hover    { background: var(--gray-100); text-decoration: none; }
.btn-danger   { background: var(--danger); color: white; }
.btn-danger:hover   { opacity: .9; text-decoration: none; }
.btn-success  { background: var(--success); color: white; }
.btn-sm  { padding: 7px 14px; font-size: 0.8125rem; }
.btn-lg  { padding: 14px 32px; font-size: 1.0625rem; }
.btn-full { width: 100%; justify-content: center; }
.btn[disabled] { opacity: 0.5; cursor: not-allowed; }

/* ===== HERO (legacy — overridden by premium.css .premium-hero) ===== */
.hero {
    position: relative; overflow: hidden;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 60%, #0a1a2e 100%);
    color: white; padding: 100px 0 80px;
}
.hero-inner { position: relative; display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.hero-label { display: inline-flex; align-items: center; gap: 8px; background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.2); color: rgba(255,255,255,.9); padding: 6px 14px; border-radius: 99px; font-size: 0.8125rem; font-weight: 500; margin-bottom: 20px; }
.hero-image { border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-lg); }
.hero-image img { width: 100%; height: 420px; object-fit: cover; }

/* ===== FLASH MESSAGES ===== */
.flash {
    display: flex; align-items: flex-start; gap: 12px;
    padding: 14px 20px; margin: 16px 20px; border-radius: var(--radius);
    font-size: 0.9375rem; border-left: 4px solid;
    animation: slideDown .25s ease;
}
.flash-success { background: #f0fdf4; border-color: var(--success); color: #15803d; }
.flash-error   { background: #fef2f2; border-color: var(--danger); color: #b91c1c; }
.flash-close   { margin-left: auto; background: none; border: none; font-size: 1.25rem; cursor: pointer; opacity: .5; line-height: 1; padding: 0 4px; }
.flash-close:hover { opacity: 1; }
@keyframes slideDown { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: translateY(0); } }

/* ===== CARDS ===== */
.card { background: white; border-radius: var(--radius-lg); box-shadow: var(--shadow); overflow: hidden; transition: box-shadow var(--transition), transform var(--transition); }
.card:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.card-img { aspect-ratio: 16/9; overflow: hidden; }
.card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s ease; }
.card:hover .card-img img { transform: scale(1.04); }
.card-body { padding: 20px; }
.card-title { font-size: 1.0625rem; font-weight: 700; color: var(--gray-900); margin-bottom: 8px; line-height: 1.3; }
.card-meta  { font-size: 0.8125rem; color: var(--gray-400); display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 10px; }
.card-excerpt { font-size: 0.9rem; color: var(--gray-600); line-height: 1.6; margin-bottom: 16px; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.card-price { font-size: 1.25rem; font-weight: 800; color: var(--primary); }
.card-compare-price { text-decoration: line-through; color: var(--gray-400); font-size: 0.9rem; margin-left: 6px; }
.card-footer { padding: 0 20px 20px; display: flex; justify-content: space-between; align-items: center; }

/* ===== BADGES ===== */
.badge { display: inline-flex; align-items: center; padding: 3px 10px; border-radius: 99px; font-size: 0.75rem; font-weight: 600; }
.badge-primary  { background: #dbeafe; color: #1d4ed8; }
.badge-success  { background: #dcfce7; color: #15803d; }
.badge-warning  { background: #fef3c7; color: #92400e; }
.badge-danger   { background: #fee2e2; color: #b91c1c; }
.badge-gray     { background: var(--gray-100); color: var(--gray-600); }
.badge-accent   { background: #fef3c7; color: #78350f; }

/* ===== STARS ===== */
.stars { color: #fbbf24; letter-spacing: 1px; }
.star-empty { color: var(--gray-200); }

/* ===== FORMS ===== */
.form-group { margin-bottom: 20px; }
.form-label { display: block; font-weight: 500; color: var(--gray-700); margin-bottom: 6px; font-size: 0.9375rem; }
.form-label .required { color: var(--danger); }
.form-control {
    width: 100%; padding: 10px 14px;
    border: 1.5px solid var(--gray-200); border-radius: var(--radius);
    font-size: 0.9375rem; font-family: var(--font);
    transition: border-color var(--transition), box-shadow var(--transition);
    background: white; color: var(--gray-900);
}
.form-control:focus { outline: none; border-color: var(--primary-light); box-shadow: 0 0 0 3px rgba(37,99,235,.15); }
.form-control.is-invalid { border-color: var(--danger); }
.form-error { color: var(--danger); font-size: 0.8125rem; margin-top: 4px; }
.form-hint  { color: var(--gray-400); font-size: 0.8125rem; margin-top: 4px; }
.form-row   { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
textarea.form-control { resize: vertical; min-height: 120px; }
select.form-control { cursor: pointer; }
.form-check { display: flex; align-items: center; gap: 8px; cursor: pointer; }
.form-check input[type="checkbox"] { width: 16px; height: 16px; cursor: pointer; accent-color: var(--primary); }

/* ===== TABLES ===== */
.table-wrap { overflow-x: auto; border-radius: var(--radius-lg); border: 1px solid var(--gray-200); }
table { width: 100%; border-collapse: collapse; font-size: 0.9375rem; }
th { background: var(--gray-50); padding: 12px 16px; text-align: left; font-weight: 600; color: var(--gray-700); font-size: 0.8125rem; text-transform: uppercase; letter-spacing: .5px; border-bottom: 1px solid var(--gray-200); white-space: nowrap; }
td { padding: 14px 16px; border-bottom: 1px solid var(--gray-100); vertical-align: middle; }
tr:last-child td { border-bottom: none; }
tr:hover td { background: var(--gray-50); }

/* ===== PAGINATION ===== */
.pagination { display: flex; justify-content: center; gap: 6px; margin-top: 40px; flex-wrap: wrap; }
.page-link { padding: 8px 14px; border-radius: var(--radius); border: 1.5px solid var(--gray-200); color: var(--gray-700); font-weight: 500; transition: all var(--transition); }
.page-link:hover, .page-link.active { background: var(--primary); border-color: var(--primary); color: white; text-decoration: none; }
.page-link[disabled], .page-link.disabled { opacity: .4; pointer-events: none; }

/* ===== SECTION BACKGROUNDS ===== */
.bg-primary { background: var(--primary); color: white; }
.bg-gray    { background: var(--gray-50); }
.bg-dark    { background: var(--primary-dark); color: white; }
.bg-accent  { background: var(--accent); }

/* ===== TESTIMONIALS ===== */
.testimonials-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.testimonial-card { background: white; border-radius: var(--radius-lg); padding: 28px; box-shadow: var(--shadow-md); border-top: 3px solid var(--primary-light); }
.testimonial-text { font-style: italic; color: var(--gray-700); margin-bottom: 20px; line-height: 1.7; font-size: 0.9375rem; }
.testimonial-author { display: flex; align-items: center; gap: 12px; }
.testimonial-avatar { width: 48px; height: 48px; border-radius: 50%; object-fit: cover; border: 2px solid var(--gray-200); }
.testimonial-name { font-weight: 700; color: var(--gray-900); font-size: 0.9375rem; }
.testimonial-role { font-size: 0.8125rem; color: var(--gray-400); }

/* ===== FEATURE GRID ===== */
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px; }
.feature-item { text-align: center; padding: 32px 20px; }
.feature-icon { width: 64px; height: 64px; border-radius: 50%; background: rgba(37,99,235,.1); display: flex; align-items: center; justify-content: center; margin: 0 auto 16px; }
.feature-title { font-size: 1.125rem; font-weight: 700; color: var(--primary); margin-bottom: 8px; }
.feature-text  { font-size: 0.9rem; color: var(--gray-600); line-height: 1.6; }

/* ===== PULLQUOTE ===== */
.pullquote { background: var(--primary); color: white; padding: 64px 0; text-align: center; }
.pullquote blockquote { font-size: clamp(1.25rem, 2.5vw, 1.875rem); font-weight: 700; line-height: 1.5; max-width: 820px; margin: 0 auto; }
.pullquote cite { display: block; margin-top: 20px; font-size: 0.9375rem; opacity: .75; font-style: normal; }

/* ===== CTA SECTION ===== */
.cta-section { background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%); color: white; padding: 80px 0; text-align: center; }
.cta-title { font-size: clamp(1.75rem, 3vw, 2.5rem); font-weight: 800; margin-bottom: 16px; }
.cta-text  { font-size: 1.0625rem; opacity: .85; margin-bottom: 32px; max-width: 540px; margin-left: auto; margin-right: auto; }

/* ===== FAQ ACCORDION ===== */
.faq-item { border-bottom: 1px solid var(--gray-200); }
.faq-question {
    width: 100%; text-align: left; background: none; border: none; cursor: pointer;
    padding: 20px 0; display: flex; justify-content: space-between; align-items: center;
    font-size: 1.0625rem; font-weight: 600; color: var(--gray-900);
}
.faq-question:hover { color: var(--primary); }
.faq-icon { flex-shrink: 0; transition: transform var(--transition); }
.faq-item.open .faq-icon { transform: rotate(45deg); }
.faq-answer { overflow: hidden; max-height: 0; transition: max-height .35s ease, padding .35s ease; }
.faq-item.open .faq-answer { max-height: 500px; }
.faq-answer-inner { padding-bottom: 20px; color: var(--gray-600); line-height: 1.7; }

/* ===== AUTH PAGES ===== */
.auth-page { min-height: calc(100vh - var(--header-h)); display: flex; align-items: center; background: var(--gray-50); padding: 40px 20px; }
.auth-card { background: white; border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); padding: 48px; max-width: 460px; width: 100%; margin: 0 auto; }
.auth-logo { text-align: center; margin-bottom: 32px; }
.auth-logo img { height: 48px; margin: 0 auto; }
.auth-title { font-size: 1.75rem; font-weight: 800; color: var(--primary); text-align: center; margin-bottom: 8px; }
.auth-subtitle { text-align: center; color: var(--gray-400); margin-bottom: 32px; font-size: 0.9375rem; }
.auth-footer { text-align: center; margin-top: 24px; color: var(--gray-600); font-size: 0.9375rem; }

/* ===== BREADCRUMB ===== */
.breadcrumb { display: flex; align-items: center; gap: 8px; font-size: 0.875rem; color: var(--gray-400); padding: 16px 0; }
.breadcrumb a { color: var(--gray-400); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb-sep { opacity: .5; }

/* ===== PRODUCT GRID ===== */
.product-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 24px; }
.product-card { background: white; border-radius: var(--radius-lg); box-shadow: var(--shadow); overflow: hidden; transition: box-shadow var(--transition), transform var(--transition); display: flex; flex-direction: column; }
.product-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.product-img { aspect-ratio: 1; overflow: hidden; }
.product-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s ease; }
.product-card:hover .product-img img { transform: scale(1.05); }
.product-body { padding: 16px; flex: 1; display: flex; flex-direction: column; }
.product-name { font-weight: 700; color: var(--gray-900); margin-bottom: 8px; font-size: 0.9375rem; line-height: 1.4; }
.product-price { font-size: 1.125rem; font-weight: 800; color: var(--primary); }
.product-rating { display: flex; align-items: center; gap: 6px; margin-bottom: 10px; }
.product-rating .stars { font-size: 0.875rem; }
.product-rating span { font-size: 0.8125rem; color: var(--gray-400); }
.product-actions { margin-top: auto; padding-top: 12px; }

/* ===== SIDEBAR LAYOUT ===== */
.sidebar-layout { display: grid; grid-template-columns: 280px 1fr; gap: 40px; align-items: start; }
.sidebar-card { background: white; border-radius: var(--radius-lg); border: 1px solid var(--gray-200); padding: 24px; margin-bottom: 24px; }
.sidebar-card h3 { font-size: 1rem; font-weight: 700; color: var(--gray-900); margin-bottom: 16px; padding-bottom: 12px; border-bottom: 1px solid var(--gray-100); }

/* Filter sidebar */
.filter-label { font-size: 0.8125rem; font-weight: 600; text-transform: uppercase; letter-spacing: .5px; color: var(--gray-400); margin-bottom: 10px; }
.filter-option { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; cursor: pointer; color: var(--gray-700); font-size: 0.9375rem; }
.filter-option input { accent-color: var(--primary); }
.filter-option:hover { color: var(--primary); }

/* ===== CART ===== */
.cart-table td:last-child { text-align: right; }
.cart-qty-input { width: 60px; text-align: center; padding: 6px; border: 1.5px solid var(--gray-200); border-radius: var(--radius); font-family: var(--font); }
.cart-remove { background: none; border: none; color: var(--gray-400); cursor: pointer; transition: color var(--transition); }
.cart-remove:hover { color: var(--danger); }
.order-summary { background: var(--gray-50); border-radius: var(--radius-lg); padding: 28px; }
.summary-row { display: flex; justify-content: space-between; align-items: center; padding: 8px 0; font-size: 0.9375rem; }
.summary-row.total { font-size: 1.125rem; font-weight: 800; padding-top: 16px; border-top: 2px solid var(--gray-200); margin-top: 8px; }
.coupon-form { display: flex; gap: 8px; margin-top: 16px; }
.coupon-form input { flex: 1; }

/* ===== COURSE LESSON ===== */
.lesson-layout { display: grid; grid-template-columns: 1fr 340px; gap: 32px; align-items: start; }
.lesson-video { background: #000; border-radius: var(--radius-lg); overflow: hidden; aspect-ratio: 16/9; margin-bottom: 24px; }
.lesson-video iframe { width: 100%; height: 100%; border: none; }
.lesson-content { line-height: 1.8; color: var(--gray-700); }
.lesson-content h2,h3 { color: var(--primary); margin: 24px 0 12px; }
.progress-bar { background: var(--gray-200); border-radius: 99px; height: 6px; margin-top: 8px; }
.progress-fill { background: var(--success); height: 100%; border-radius: 99px; transition: width .5s ease; }
.curriculum-section { margin-bottom: 16px; }
.curriculum-section-title { font-weight: 700; color: var(--gray-900); padding: 10px 0; font-size: 0.9375rem; }
.curriculum-lesson { display: flex; align-items: center; gap: 10px; padding: 10px 12px; border-radius: var(--radius); color: var(--gray-600); font-size: 0.875rem; transition: background var(--transition); }
.curriculum-lesson:hover { background: var(--gray-100); text-decoration: none; }
.curriculum-lesson.active { background: #dbeafe; color: var(--primary); font-weight: 600; }
.curriculum-lesson.completed { color: var(--success); }
.lesson-check { width: 18px; height: 18px; border-radius: 50%; border: 2px solid var(--gray-300); flex-shrink: 0; display: flex; align-items: center; justify-content: center; }
.lesson-check.done { background: var(--success); border-color: var(--success); color: white; }

/* ===== ACCOUNT TABS ===== */
.account-tabs { display: flex; gap: 4px; border-bottom: 2px solid var(--gray-200); margin-bottom: 32px; overflow-x: auto; }
.account-tab { padding: 12px 20px; font-weight: 600; color: var(--gray-400); border-bottom: 2px solid transparent; margin-bottom: -2px; white-space: nowrap; transition: all var(--transition); cursor: pointer; background: none; border: none; font-size: 0.9375rem; font-family: var(--font); }
.account-tab:hover { color: var(--primary); }
.account-tab.active { color: var(--primary); border-bottom-color: var(--primary); }

/* ===== BLOG ===== */
.blog-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.post-card { background: white; border-radius: var(--radius-lg); box-shadow: var(--shadow); overflow: hidden; display: flex; flex-direction: column; transition: box-shadow var(--transition), transform var(--transition); }
.post-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.post-thumb { aspect-ratio: 16/9; overflow: hidden; }
.post-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s ease; }
.post-card:hover .post-thumb img { transform: scale(1.04); }
.post-body { padding: 20px; flex: 1; display: flex; flex-direction: column; }
.post-category { font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: .5px; color: var(--primary-light); margin-bottom: 8px; }
.post-title { font-size: 1.0625rem; font-weight: 700; color: var(--gray-900); margin-bottom: 10px; line-height: 1.4; }
.post-excerpt { font-size: 0.9rem; color: var(--gray-600); line-height: 1.6; margin-bottom: 16px; flex: 1; }
.post-meta { display: flex; align-items: center; gap: 12px; font-size: 0.8125rem; color: var(--gray-400); }
.members-badge { background: var(--accent); color: var(--primary-dark); padding: 2px 8px; border-radius: 99px; font-size: 0.7rem; font-weight: 700; text-transform: uppercase; }

/* Paywall overlay */
.paywall { position: relative; overflow: hidden; border-radius: var(--radius-lg); }
.paywall-content { filter: blur(4px); pointer-events: none; user-select: none; max-height: 400px; overflow: hidden; }
.paywall-cta { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; background: linear-gradient(to bottom, rgba(255,255,255,0) 0%, rgba(255,255,255,.97) 40%); }
.paywall-box { background: white; border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); padding: 36px; text-align: center; max-width: 380px; }

/* ===== FOOTER ===== */
.site-footer { background: var(--primary-dark); color: rgba(255,255,255,.8); padding: 64px 0 32px; margin-top: 80px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 2fr; gap: 48px; margin-bottom: 48px; }
.footer-brand img { margin-bottom: 16px; filter: brightness(0) invert(1); }
.footer-tagline { font-size: 0.9rem; line-height: 1.7; opacity: .75; margin-bottom: 20px; }
.footer-social { display: flex; gap: 12px; }
.footer-social a { color: rgba(255,255,255,.6); transition: color var(--transition); }
.footer-social a:hover { color: var(--accent); }
.footer-col h4 { color: white; font-weight: 700; margin-bottom: 16px; font-size: 0.9375rem; }
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul a { color: rgba(255,255,255,.65); font-size: 0.9rem; transition: color var(--transition); }
.footer-col ul a:hover { color: var(--accent); text-decoration: none; }
.footer-newsletter p { font-size: 0.9rem; opacity: .75; margin-bottom: 16px; }
.footer-newsletter-form input { width: 100%; padding: 10px 14px; border-radius: var(--radius); border: 1px solid rgba(255,255,255,.2); background: rgba(255,255,255,.08); color: white; font-family: var(--font); margin-bottom: 10px; }
.footer-newsletter-form input::placeholder { color: rgba(255,255,255,.4); }
.newsletter-row { display: grid; grid-template-columns: 1fr 1.5fr; gap: 8px; margin-bottom: 10px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); padding-top: 24px; text-align: center; font-size: 0.875rem; opacity: .5; }

/* ===== UTILITY ===== */
.hidden { display: none; }
.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mt-6 { margin-top: 48px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }
.gap-1 { gap: 8px; }
.d-flex { display: flex; }
.align-center { align-items: center; }
.justify-between { justify-content: space-between; }
.flex-wrap { flex-wrap: wrap; }
.text-muted { color: var(--gray-400); }
.text-danger { color: var(--danger); }
.text-success { color: var(--success); }
.fw-bold { font-weight: 700; }
.page-header { background: var(--gray-50); padding: 40px 0; border-bottom: 1px solid var(--gray-200); margin-bottom: 48px; }
.page-header h1 { font-size: clamp(1.5rem, 3vw, 2.25rem); font-weight: 800; color: var(--primary); }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .feature-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
    .sidebar-layout { grid-template-columns: 240px 1fr; }
}
@media (max-width: 768px) {
    .header-nav { display: none; }
    .mobile-menu-btn { display: flex; }
    .hero-inner { grid-template-columns: 1fr; }
    .hero-image { display: none; }
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    .testimonials-grid { grid-template-columns: 1fr; }
    .blog-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .sidebar-layout { grid-template-columns: 1fr; }
    .lesson-layout { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; }
    .feature-grid { grid-template-columns: 1fr 1fr; }
    .section { padding: 56px 0; }
    .newsletter-row { grid-template-columns: 1fr; }
    .auth-card { padding: 32px 24px; }
    .product-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
    .product-grid { grid-template-columns: 1fr; }
    .feature-grid { grid-template-columns: 1fr; }
    .hero-actions { flex-direction: column; }
    .btn-lg { width: 100%; justify-content: center; }
}