/* ========================================================
   AOA ĐIỆN LẠNH & BÁO CÁO THỰC TẬP 8 TUẦN (AOA TECHNOLOGY)
   Vanilla CSS Design System with Dark Mode, MVC Diagrams & Print Support
   ======================================================== */

:root {
    --primary: #0284c7;
    --primary-hover: #0369a1;
    --primary-light: #e0f2fe;
    --primary-glow: rgba(2, 132, 199, 0.25);
    --secondary: #06b6d4;
    --secondary-hover: #0891b2;
    --accent: #f97316;
    --accent-glow: rgba(249, 115, 22, 0.25);
    --danger: #ef4444;
    --success: #10b981;
    --success-light: #d1fae5;
    
    --bg-main: #f8fafc;
    --bg-card: #ffffff;
    --bg-surface: #f1f5f9;
    --bg-hero: linear-gradient(135deg, #e0f2fe 0%, #f0fdf4 50%, #eff6ff 100%);
    
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --text-inverse: #ffffff;
    
    --border-color: #e2e8f0;
    --border-hover: #bae6fd;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 20px 25px -5px rgba(2, 132, 199, 0.12), 0 8px 10px -6px rgba(2, 132, 199, 0.08);
    
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-full: 9999px;
    
    --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'Space Grotesk', monospace;
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --bg-main: #0b1329;
    --bg-card: #131f37;
    --bg-surface: #1e293b;
    --bg-hero: linear-gradient(135deg, #0b1329 0%, #162444 50%, #0d1b33 100%);
    
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;
    
    --border-color: #273752;
    --border-hover: #0284c7;
    
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: 1240px;
    margin: 0 auto;
    padding: 0 20px;
}

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition);
}

button {
    cursor: pointer;
    font-family: inherit;
    border: none;
    outline: none;
    background: none;
    transition: var(--transition);
}

/* BUTTON SYSTEM */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.btn-sm {
    padding: 8px 16px;
    font-size: 0.85rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: #ffffff;
    box-shadow: 0 4px 12px var(--primary-glow);
}

.btn-primary:hover {
    box-shadow: 0 6px 18px var(--primary-glow);
    transform: translateY(-2px);
    filter: brightness(1.08);
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--primary-light);
    border-color: var(--primary);
    transform: translateY(-2px);
}

.btn-block {
    width: 100%;
}

/* TOPBAR */
.topbar {
    background-color: #0b1528;
    color: #cbd5e1;
    font-size: 0.82rem;
    padding: 8px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.topbar-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.topbar-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.aoa-badge {
    background: rgba(14, 165, 233, 0.2);
    color: #38bdf8;
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    font-weight: 700;
}

.divider {
    color: #475569;
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.role-selector-box {
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(255, 255, 255, 0.1);
    padding: 3px 8px;
    border-radius: var(--radius-sm);
}

.role-label {
    font-size: 0.75rem;
    color: #93c5fd;
}

.role-dropdown {
    background: #0284c7;
    color: #ffffff;
    border: none;
    border-radius: var(--radius-sm);
    padding: 3px 6px;
    font-size: 0.78rem;
    font-weight: 700;
    cursor: pointer;
    outline: none;
}

.topbar-auth-btn {
    color: #f8fafc;
    font-size: 0.82rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(255, 255, 255, 0.08);
    padding: 4px 10px;
    border-radius: var(--radius-sm);
}

.topbar-auth-btn:hover {
    background: var(--primary);
}

.theme-toggle {
    color: #94a3b8;
    font-size: 1rem;
    padding: 4px;
    border-radius: var(--radius-sm);
}

.theme-toggle:hover {
    color: #f8fafc;
}

/* NAVBAR */
.navbar {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 99;
    box-shadow: var(--shadow-sm);
    transition: background-color 0.3s;
}

.navbar-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    padding: 12px 20px;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    box-shadow: 0 4px 10px var(--primary-glow);
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-title {
    font-size: 1.25rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo-subtitle {
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 1.5px;
    color: var(--text-muted);
}

/* MAIN NAVIGATION TABS */
.main-tabs {
    display: flex;
    align-items: center;
    gap: 6px;
    background: var(--bg-surface);
    padding: 4px;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-color);
}

.main-tab-btn {
    padding: 8px 16px;
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 6px;
    transition: var(--transition);
    white-space: nowrap;
}

.main-tab-btn:hover {
    color: var(--primary);
}

.main-tab-btn.active {
    background: var(--primary);
    color: #ffffff;
    box-shadow: 0 2px 8px var(--primary-glow);
}

.main-tab-btn.highlight-tab:not(.active) {
    color: #0284c7;
    background: rgba(2, 132, 199, 0.08);
}

/* NAV ACTIONS */
.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-action-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    position: relative;
    font-weight: 600;
    font-size: 0.88rem;
}

.nav-action-btn:hover {
    color: var(--primary);
    background: var(--primary-light);
}

.nav-action-btn .badge {
    position: absolute;
    top: 2px;
    left: 20px;
    background: var(--accent);
    color: #ffffff;
    font-size: 0.7rem;
    font-weight: 700;
    padding: 2px 6px;
    border-radius: var(--radius-full);
}

.cart-btn {
    background: linear-gradient(135deg, rgba(2, 132, 199, 0.08) 0%, rgba(6, 182, 212, 0.08) 100%);
    border: 1px solid var(--border-hover);
    padding: 6px 14px;
}

.cart-icon-wrapper {
    position: relative;
    font-size: 1.2rem;
    color: var(--primary);
}

.cart-icon-wrapper .badge {
    top: -8px;
    right: -10px;
    left: auto;
}

.cart-text {
    display: flex;
    flex-direction: column;
    text-align: left;
}

.cart-title {
    font-size: 0.72rem;
    color: var(--text-muted);
}

.cart-total {
    font-size: 0.88rem;
    font-weight: 800;
    color: var(--primary);
}

/* SECTION CARDS & COMMON HEADERS */
.section-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow-sm);
    margin-bottom: 30px;
}

/* ========================================================
   VIEW 1: STORE FRONT & CATALOG
   ======================================================== */
.category-nav {
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    padding: 8px 0;
}

.cat-container {
    display: flex;
    align-items: center;
    gap: 10px;
    overflow-x: auto;
    white-space: nowrap;
    scrollbar-width: none;
}

.cat-container::-webkit-scrollbar { display: none; }

.cat-pill {
    padding: 8px 18px;
    border-radius: var(--radius-full);
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 8px;
}

.cat-pill:hover {
    color: var(--primary);
    border-color: var(--primary);
}

.cat-pill.active {
    background: var(--primary);
    color: #ffffff;
    border-color: var(--primary);
    box-shadow: 0 2px 8px var(--primary-glow);
}

/* HERO SECTION */
.hero-section {
    background: var(--bg-hero);
    padding: 48px 0 64px 0;
    position: relative;
    border-bottom: 1px solid var(--border-color);
}

.hero-container {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 40px;
    align-items: center;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(2, 132, 199, 0.12);
    border: 1px solid rgba(2, 132, 199, 0.25);
    padding: 6px 14px;
    border-radius: var(--radius-full);
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 18px;
}

.pulse-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--primary);
    animation: pulse 1.8s infinite;
}

@keyframes pulse {
    0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(2, 132, 199, 0.7); }
    70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(2, 132, 199, 0); }
    100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(2, 132, 199, 0); }
}

.hero-title {
    font-size: 2.8rem;
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -1px;
    margin-bottom: 18px;
    color: var(--text-primary);
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-desc {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
    max-width: 580px;
}

.hero-perks {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 30px;
}

.perk-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.92rem;
    font-weight: 600;
}

.perk-item i { color: var(--primary); font-size: 1.1rem; }

.hero-cta-group {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

/* HERO DEMO CARD */
.hero-demo-card { position: relative; }
.demo-glow {
    position: absolute;
    inset: -10px;
    background: radial-gradient(circle, rgba(6, 182, 212, 0.3) 0%, rgba(2, 132, 199, 0) 70%);
    filter: blur(20px);
}

.demo-card-inner {
    position: relative;
    z-index: 1;
    background: var(--bg-card);
    border: 1px solid var(--border-hover);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-xl);
}

.demo-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.demo-badge {
    background: #fef3c7;
    color: #b45309;
    font-size: 0.78rem;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: var(--radius-full);
}

.demo-power-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
}

.status-on { font-size: 0.8rem; font-weight: 600; color: var(--success); }
.status-off { font-size: 0.8rem; font-weight: 600; color: var(--danger); }

.power-btn {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--primary-light);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.power-btn:hover { background: var(--primary); color: #ffffff; }
.power-btn.off { background: #fee2e2; color: var(--danger); }

.demo-image-box {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: 18px;
}

.ac-img {
    width: 100%;
    height: 280px;
    object-fit: cover;
    display: block;
    transition: transform 0.5s ease;
}

.cool-breeze-stream {
    position: absolute;
    bottom: 25px;
    left: 20%;
    right: 20%;
    height: 40px;
    pointer-events: none;
    display: flex;
    flex-direction: column;
    gap: 6px;
    opacity: 0.85;
    transition: opacity 0.3s;
}

.cool-breeze-stream.off { opacity: 0; }

.wave {
    height: 4px;
    border-radius: 4px;
    background: linear-gradient(90deg, transparent, rgba(6, 182, 212, 0.8), transparent);
    animation: flowBreeze 2s infinite linear;
}

.wave-2 { animation-delay: 0.4s; }
.wave-3 { animation-delay: 0.8s; }

@keyframes flowBreeze {
    0% { transform: translateY(0) scaleX(0.7); opacity: 0; }
    50% { opacity: 1; }
    100% { transform: translateY(18px) scaleX(1.1); opacity: 0; }
}

.temp-floating-display {
    position: absolute;
    top: 16px;
    right: 16px;
    background: rgba(11, 21, 40, 0.85);
    backdrop-filter: blur(8px);
    color: #ffffff;
    padding: 8px 14px;
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.15);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.temp-num { font-size: 1.8rem; font-weight: 800; line-height: 1; color: #38bdf8; }
.temp-unit { font-size: 1rem; font-weight: 600; color: #94a3b8; }
.temp-sub { font-size: 0.65rem; font-weight: 600; color: #cbd5e1; }

.demo-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
}

.temp-adjust {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-surface);
    padding: 4px 10px;
    border-radius: var(--radius-full);
}

.temp-btn {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    font-size: 0.8rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.temp-btn:hover { background: var(--primary); color: #ffffff; }
.temp-label { font-size: 0.8rem; font-weight: 600; color: var(--text-secondary); }

/* PRODUCT CATALOG SECTION */
.products-section { padding: 50px 0; }
.section-header { display: flex; justify-content: space-between; align-items: flex-end; margin-bottom: 30px; flex-wrap: wrap; gap: 20px; }
.section-title { font-size: 1.85rem; font-weight: 800; color: var(--text-primary); }
.section-subtitle { font-size: 0.95rem; color: var(--text-muted); }
.catalog-toolbar { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }

.search-box-inline {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 6px 14px;
    border-radius: var(--radius-full);
}

.search-box-inline input {
    border: none;
    outline: none;
    background: none;
    font-size: 0.88rem;
    color: var(--text-primary);
    width: 180px;
}

.brand-filter-group { display: flex; gap: 8px; }
.brand-chip {
    padding: 6px 14px;
    border-radius: var(--radius-full);
    font-size: 0.82rem;
    font-weight: 600;
    background: var(--bg-surface);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.brand-chip.active { background: var(--primary); color: #ffffff; border-color: var(--primary); }
.sort-wrapper { display: flex; align-items: center; gap: 8px; font-size: 0.88rem; color: var(--text-secondary); }
.sort-select { padding: 8px 14px; border-radius: var(--radius-md); border: 1px solid var(--border-color); background: var(--bg-card); color: var(--text-primary); font-size: 0.88rem; font-weight: 600; }

/* PRODUCT GRID */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.product-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
}

.product-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
    border-color: var(--border-hover);
}

.product-thumb-box {
    position: relative;
    height: 220px;
    background: #f8fafc;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

[data-theme="dark"] .product-thumb-box { background: #1e293b; }
.product-thumb { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.product-card:hover .product-thumb { transform: scale(1.05); }

.product-badges {
    position: absolute;
    top: 12px;
    left: 12px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    z-index: 2;
}

.badge-discount { background: var(--danger); color: #ffffff; font-size: 0.75rem; font-weight: 800; padding: 3px 8px; border-radius: var(--radius-sm); }
.badge-tag { background: var(--primary); color: #ffffff; font-size: 0.7rem; font-weight: 700; padding: 3px 8px; border-radius: var(--radius-sm); }

.wishlist-toggle-btn {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.9);
    color: #94a3b8;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    z-index: 2;
}

[data-theme="dark"] .wishlist-toggle-btn { background: rgba(19, 31, 55, 0.9); }
.wishlist-toggle-btn.active { color: var(--danger); }

.product-body { padding: 18px; display: flex; flex-direction: column; flex: 1; }
.product-category-brand { display: flex; justify-content: space-between; font-size: 0.78rem; font-weight: 700; color: var(--primary); margin-bottom: 6px; }
.product-title { font-size: 1rem; font-weight: 700; line-height: 1.4; margin-bottom: 8px; height: 2.8em; overflow: hidden; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }

.product-specs-list { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px; }
.spec-chip { background: var(--bg-surface); color: var(--text-secondary); font-size: 0.72rem; font-weight: 600; padding: 3px 8px; border-radius: var(--radius-sm); }

.product-rating { display: flex; align-items: center; gap: 6px; font-size: 0.8rem; color: #eab308; margin-bottom: 12px; }
.review-count { color: var(--text-muted); font-size: 0.75rem; }

.product-price-box { margin-top: auto; margin-bottom: 14px; }
.current-price { font-size: 1.25rem; font-weight: 800; color: var(--danger); }
.original-price { font-size: 0.85rem; color: var(--text-muted); text-decoration: line-through; margin-left: 8px; }

.gift-box {
    background: #f0fdf4;
    border: 1px dashed #86efac;
    color: #15803d;
    font-size: 0.75rem;
    padding: 6px 10px;
    border-radius: var(--radius-sm);
    margin-bottom: 14px;
    display: flex;
    align-items: center;
    gap: 6px;
}

[data-theme="dark"] .gift-box { background: rgba(22, 101, 52, 0.2); border-color: rgba(74, 222, 128, 0.4); color: #4ade80; }

.product-actions { display: grid; grid-template-columns: 1fr auto; gap: 8px; }
.btn-add-cart {
    background: var(--primary);
    color: #ffffff;
    padding: 10px;
    border-radius: var(--radius-md);
    font-size: 0.88rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.btn-add-cart:hover { background: var(--primary-hover); }

.btn-quick-view {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-quick-view:hover { background: var(--primary-light); color: var(--primary); border-color: var(--primary); }

/* ========================================================
   VIEW 2: TRA CỨU ĐƠN HÀNG (TUẦN 6)
   ======================================================== */
.orders-lookup-section { padding: 40px 0 60px 0; }
.lookup-search-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--bg-surface);
    border: 1.5px solid var(--border-color);
    padding: 8px 16px;
    border-radius: var(--radius-full);
    margin: 24px 0 32px 0;
}

.lookup-search-bar input {
    flex: 1;
    border: none;
    outline: none;
    background: none;
    font-size: 0.95rem;
    color: var(--text-primary);
}

.order-card-detail {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 24px;
    margin-bottom: 20px;
}

.order-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
    flex-wrap: wrap;
    gap: 10px;
}

.order-progress-steps {
    display: flex;
    justify-content: space-between;
    position: relative;
    margin: 28px 0;
}

.order-progress-steps::before {
    content: '';
    position: absolute;
    top: 14px;
    left: 20px;
    right: 20px;
    height: 3px;
    background: var(--border-color);
    z-index: 0;
}

.progress-step {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--text-muted);
}

.step-icon {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
}

.progress-step.done { color: var(--success); }
.progress-step.done .step-icon { background: var(--success); color: #ffffff; border-color: var(--success); }
.progress-step.active { color: var(--primary); }
.progress-step.active .step-icon { background: var(--primary); color: #ffffff; border-color: var(--primary); }

/* ========================================================
   VIEW 3: BÁO CÁO 8 TUẦN THỰC TẬP (AOA)
   ======================================================== */
.report-header-section { padding: 40px 0 60px 0; }
.report-header-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 36px;
    margin-bottom: 30px;
    box-shadow: var(--shadow-lg);
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 30px;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.report-header-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #0284c7, #06b6d4, #10b981);
}

.report-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(2, 132, 199, 0.1);
    color: var(--primary);
    padding: 6px 14px;
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 800;
    letter-spacing: 0.5px;
    margin-bottom: 12px;
}

.report-main-title {
    font-size: 2.2rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.report-company-info { font-size: 0.95rem; color: var(--text-secondary); line-height: 1.7; }
.report-summary-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }

.stat-box {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    padding: 20px 12px;
    border-radius: var(--radius-md);
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.stat-number { font-size: 1.8rem; font-weight: 800; color: var(--primary); font-family: var(--font-mono); }
.stat-label { font-size: 0.78rem; font-weight: 600; color: var(--text-muted); }

.week-filter-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 16px;
    margin-bottom: 24px;
    scrollbar-width: none;
}

.week-filter-chip {
    padding: 6px 14px;
    border-radius: var(--radius-full);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--text-secondary);
    white-space: nowrap;
}

.week-filter-chip.active { background: var(--primary); color: #ffffff; border-color: var(--primary); }

.weeks-timeline { display: flex; flex-direction: column; gap: 24px; }
.week-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 28px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.week-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 20px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--border-color);
}

.week-badge-group { display: flex; align-items: center; gap: 12px; }
.week-num-badge {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: #ffffff;
    padding: 6px 16px;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 800;
    font-family: var(--font-mono);
}

.week-time-text { font-size: 0.95rem; font-weight: 700; color: var(--text-secondary); }
.week-status-badge {
    background: var(--success-light);
    color: #065f46;
    font-size: 0.82rem;
    font-weight: 800;
    padding: 6px 14px;
    border-radius: var(--radius-full);
}

[data-theme="dark"] .week-status-badge { background: rgba(16, 185, 129, 0.2); color: #6ee7b7; }

.week-content-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-bottom: 20px; }
.week-column { background: var(--bg-surface); padding: 18px 20px; border-radius: var(--radius-md); border: 1px solid var(--border-color); }
.column-title { font-size: 0.95rem; font-weight: 800; margin-bottom: 14px; }
.column-title.task-title { color: var(--primary); }
.column-title.result-title { color: var(--success); }

.week-item-list { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.week-item-list li { font-size: 0.9rem; color: var(--text-secondary); display: flex; align-items: flex-start; gap: 10px; line-height: 1.5; }
.task-list i { color: var(--primary); }
.result-list i { color: var(--success); }

.week-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    padding-top: 14px;
    border-top: 1px dashed var(--border-color);
}

.confirm-text { color: var(--success); font-weight: 700; }
.demo-feature-btn {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--primary);
    background: var(--primary-light);
    padding: 6px 14px;
    border-radius: var(--radius-md);
}

.report-cta-box {
    margin-top: 36px;
    background: linear-gradient(135deg, #0284c7 0%, #0f172a 100%);
    border-radius: var(--radius-lg);
    padding: 28px 32px;
    color: #ffffff;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

/* ========================================================
   VIEW 4: THIẾT KẾ HỆ THỐNG & DIAGRAMS (TUẦN 2 & 3)
   ======================================================== */
.docs-section { padding: 40px 0 60px 0; }
.docs-grid { display: flex; flex-direction: column; gap: 28px; }
.doc-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
}

.doc-card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    color: var(--primary);
}

.doc-card-header h3 { font-size: 1.25rem; font-weight: 800; color: var(--text-primary); }

.mvc-diagram-box {
    display: flex;
    align-items: center;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: 16px;
    background: var(--bg-card);
    padding: 30px;
    border-radius: var(--radius-md);
    border: 1.5px dashed var(--border-color);
}

.mvc-node {
    background: var(--bg-surface);
    border: 2px solid var(--border-color);
    padding: 20px 24px;
    border-radius: var(--radius-md);
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 6px;
    min-width: 200px;
}

.mvc-node strong { font-size: 1rem; color: var(--primary); }
.mvc-node span { font-size: 0.8rem; color: var(--text-muted); }
.mvc-arrow { font-size: 0.85rem; font-weight: 700; color: var(--text-muted); text-align: center; }

.erd-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
}

.erd-table {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.erd-table-name {
    background: var(--primary-light);
    color: var(--primary);
    padding: 10px 14px;
    font-weight: 800;
    font-size: 0.9rem;
    border-bottom: 1px solid var(--border-color);
}

.erd-table ul { list-style: none; padding: 12px 14px; display: flex; flex-direction: column; gap: 6px; font-size: 0.82rem; }
.pk { color: #b45309; background: #fef3c7; padding: 1px 4px; border-radius: 3px; font-size: 0.7rem; margin-right: 4px; }
.fk { color: #0284c7; background: #e0f2fe; padding: 1px 4px; border-radius: 3px; font-size: 0.7rem; margin-right: 4px; }

/* ========================================================
   VIEW 5: QUẢN TRỊ ADMIN (CRUD TUẦN 4, 5, 6)
   ======================================================== */
.admin-section { padding: 40px 0 60px 0; }
.admin-header-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 28px 32px;
    margin-bottom: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
    box-shadow: var(--shadow-md);
}

.admin-sub-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    overflow-x: auto;
    padding-bottom: 6px;
}

.sub-tab-btn {
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--text-secondary);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
}

.sub-tab-btn.active {
    background: var(--primary);
    color: #ffffff;
    border-color: var(--primary);
    box-shadow: 0 2px 8px var(--primary-glow);
}

.admin-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
}

.admin-card-header {
    margin-bottom: 18px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 14px;
}

.admin-search-input {
    padding: 8px 14px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    font-size: 0.88rem;
    background: var(--bg-surface);
    color: var(--text-primary);
    width: 220px;
}

.admin-table-responsive { overflow-x: auto; }
.admin-table { width: 100%; border-collapse: collapse; font-size: 0.88rem; text-align: left; }
.admin-table th { background: var(--bg-surface); padding: 12px 14px; font-weight: 700; color: var(--text-secondary); border-bottom: 1.5px solid var(--border-color); }
.admin-table td { padding: 12px 14px; border-bottom: 1px solid var(--border-color); vertical-align: middle; }
.admin-table tr:hover { background: var(--bg-surface); }
.admin-table-img { width: 44px; height: 44px; border-radius: var(--radius-sm); object-fit: cover; }
.admin-action-btn { padding: 6px 12px; border-radius: var(--radius-sm); font-size: 0.8rem; font-weight: 700; margin-right: 4px; }
.btn-edit { background: var(--primary-light); color: var(--primary); }
.btn-del { color: var(--danger); background: #fee2e2; }
.btn-lock { color: #b45309; background: #fef3c7; }
.btn-unlock { color: var(--success); background: #d1fae5; }

/* AUTH TABS & MODAL */
.auth-tabs { display: flex; border-bottom: 1.5px solid var(--border-color); margin-bottom: 24px; }
.auth-tab-btn { flex: 1; padding: 12px; font-weight: 700; font-size: 0.95rem; text-align: center; color: var(--text-muted); border-bottom: 2px solid transparent; }
.auth-tab-btn.active { color: var(--primary); border-bottom-color: var(--primary); }
.auth-form .form-group { margin-bottom: 16px; }

/* MODALS & CARTS (PRESERVED) */
.modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.65);
    backdrop-filter: blur(4px);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.modal-backdrop.open { opacity: 1; pointer-events: auto; }
.modal-dialog {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 840px;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    padding: 32px;
    box-shadow: var(--shadow-xl);
}

.modal-close { position: absolute; top: 16px; right: 20px; font-size: 2rem; line-height: 1; color: var(--text-muted); }
.modal-close:hover { color: var(--danger); }

.quick-view-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: 30px; }
.quick-view-img { width: 100%; border-radius: var(--radius-md); object-fit: cover; max-height: 380px; }
.qv-title { font-size: 1.35rem; font-weight: 800; margin-bottom: 8px; }
.qv-price-box { display: flex; align-items: baseline; gap: 12px; margin-bottom: 16px; }
.qv-specs-table { width: 100%; border-collapse: collapse; margin-bottom: 20px; font-size: 0.85rem; }
.qv-specs-table td { padding: 8px 10px; border-bottom: 1px solid var(--border-color); }
.qv-qty-controls { display: flex; align-items: center; gap: 12px; margin-bottom: 20px; }
.qty-btn { width: 34px; height: 34px; border-radius: var(--radius-md); border: 1px solid var(--border-color); background: var(--bg-surface); display: flex; align-items: center; justify-content: center; font-size: 0.9rem; font-weight: 700; }
.qty-val { font-weight: 800; font-size: 1.1rem; min-width: 24px; text-align: center; }

/* CART SLIDE-OVER DRAWER */
.cart-drawer-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.55);
    backdrop-filter: blur(3px);
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.cart-drawer-backdrop.open { opacity: 1; pointer-events: auto; }
.cart-drawer {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    max-width: 440px;
    background: var(--bg-card);
    z-index: 1001;
    box-shadow: -10px 0 25px rgba(0, 0, 0, 0.15);
    display: flex;
    flex-direction: column;
    transform: translateX(100%);
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.cart-drawer-backdrop.open .cart-drawer { transform: translateX(0); }
.drawer-header { padding: 20px 24px; border-bottom: 1px solid var(--border-color); display: flex; justify-content: space-between; align-items: center; }
.drawer-title { font-size: 1.15rem; font-weight: 800; display: flex; align-items: center; gap: 10px; }
.drawer-close { font-size: 1.8rem; color: var(--text-muted); }
.drawer-body { flex: 1; overflow-y: auto; padding: 20px; display: flex; flex-direction: column; gap: 16px; }

.cart-item { display: grid; grid-template-columns: 70px 1fr auto; gap: 14px; align-items: center; padding-bottom: 16px; border-bottom: 1px solid var(--border-color); }
.cart-item-img { width: 70px; height: 70px; border-radius: var(--radius-md); object-fit: cover; }
.cart-item-title { font-size: 0.88rem; font-weight: 700; margin-bottom: 4px; line-height: 1.3; }
.cart-item-price { font-size: 0.95rem; font-weight: 800; color: var(--danger); }
.cart-item-controls { display: flex; align-items: center; gap: 8px; margin-top: 6px; }
.cart-remove-btn { color: var(--text-muted); font-size: 0.9rem; padding: 4px; }
.cart-remove-btn:hover { color: var(--danger); }

.drawer-footer { padding: 20px 24px; border-top: 1px solid var(--border-color); background: var(--bg-surface); }
.coupon-box { display: flex; gap: 8px; margin-bottom: 14px; }
.coupon-box input { flex: 1; padding: 8px 12px; border-radius: var(--radius-md); border: 1px solid var(--border-color); background: var(--bg-card); color: var(--text-primary); font-size: 0.85rem; }
.coupon-box button { background: var(--primary); color: #ffffff; padding: 8px 14px; border-radius: var(--radius-md); font-size: 0.85rem; font-weight: 600; }
.discount-message { font-size: 0.8rem; margin-bottom: 10px; min-height: 18px; }
.summary-line { display: flex; justify-content: space-between; font-size: 0.88rem; margin-bottom: 8px; color: var(--text-secondary); }
.summary-line.total-line { font-size: 1.1rem; font-weight: 800; color: var(--text-primary); margin: 12px 0 16px 0; padding-top: 10px; border-top: 1px dashed var(--border-color); }
.total-price { color: var(--danger); font-size: 1.35rem; }
.text-green { color: var(--success); }

/* CHECKOUT MODAL */
.checkout-dialog { max-width: 680px; }
.checkout-heading { font-size: 1.4rem; font-weight: 800; margin-bottom: 20px; display: flex; align-items: center; gap: 10px; color: var(--primary); }
.form-row { display: flex; gap: 16px; }
.col-6 { flex: 1; }
.payment-methods { display: flex; flex-direction: column; gap: 10px; margin-top: 8px; }
.pay-method { display: flex; align-items: center; gap: 14px; padding: 12px 16px; border: 1.5px solid var(--border-color); border-radius: var(--radius-md); cursor: pointer; background: var(--bg-surface); }
.pay-method.active { border-color: var(--primary); background: var(--primary-light); }
[data-theme="dark"] .pay-method.active { background: rgba(2, 132, 199, 0.15); }
.pay-method i { font-size: 1.3rem; color: var(--primary); }
.pay-method div { display: flex; flex-direction: column; font-size: 0.85rem; }
.order-summary-box { background: var(--bg-surface); border-radius: var(--radius-md); padding: 16px; margin: 20px 0; }
.summary-row { display: flex; justify-content: space-between; margin-bottom: 6px; font-size: 0.9rem; }

/* SUCCESS MODAL */
.success-dialog { max-width: 480px; text-align: center; padding: 40px 30px; }
.success-icon { font-size: 4rem; color: var(--success); margin-bottom: 16px; }
.order-code-text { font-size: 1.1rem; margin: 12px 0; }
.order-code-text strong { color: var(--primary); }
.success-desc { font-size: 0.9rem; color: var(--text-secondary); margin-bottom: 24px; line-height: 1.5; }

/* TOAST NOTIFICATION */
.toast-container { position: fixed; bottom: 24px; right: 24px; z-index: 9999; display: flex; flex-direction: column; gap: 10px; pointer-events: none; }
.toast {
    background: #0f172a;
    color: #ffffff;
    padding: 12px 20px;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: var(--shadow-lg);
    pointer-events: auto;
    animation: slideInToast 0.3s ease, fadeOutToast 0.3s ease 2.7s forwards;
    border-left: 4px solid var(--secondary);
}

@keyframes slideInToast { from { transform: translateX(100%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }
@keyframes fadeOutToast { from { opacity: 1; } to { opacity: 0; transform: translateY(10px); } }

/* FOOTER */
.footer { background: #0b1528; color: #94a3b8; padding: 60px 0 20px 0; border-top: 1px solid rgba(255, 255, 255, 0.08); }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 40px; margin-bottom: 40px; }
.footer-logo { display: flex; align-items: center; gap: 10px; color: #ffffff; font-size: 1.25rem; font-weight: 800; margin-bottom: 14px; }
.footer-logo i { color: var(--secondary); }
.brand-col p { font-size: 0.88rem; line-height: 1.6; margin-bottom: 16px; }
.footer-contact p { display: flex; align-items: center; gap: 8px; font-size: 0.85rem; margin-bottom: 8px; }
.footer-col h4 { color: #ffffff; font-size: 1rem; font-weight: 700; margin-bottom: 18px; }
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.footer-col ul a { font-size: 0.88rem; }
.footer-col ul a:hover { color: #38bdf8; padding-left: 4px; }
.newsletter-form { display: flex; margin: 14px 0 20px 0; }
.newsletter-form input { flex: 1; padding: 10px 14px; border-radius: var(--radius-md) 0 0 var(--radius-md); border: 1px solid #334155; background: #1e293b; color: #ffffff; outline: none; font-size: 0.85rem; }
.newsletter-form button { background: var(--primary); color: #ffffff; padding: 0 16px; border-radius: 0 var(--radius-md) var(--radius-md) 0; }
.social-links { display: flex; gap: 12px; }
.social-links a { width: 36px; height: 36px; border-radius: 50%; background: #1e293b; color: #cbd5e1; display: flex; align-items: center; justify-content: center; }
.social-links a:hover { background: var(--primary); color: #ffffff; }
.footer-bottom { border-top: 1px solid #1e293b; padding-top: 20px; }
.footer-bottom-content { display: flex; justify-content: space-between; align-items: center; font-size: 0.82rem; }
.payment-badges { display: flex; gap: 14px; font-size: 1.4rem; color: #64748b; }

/* PRINT STYLES */
@media print {
    .topbar, .navbar, .footer, .toast-container, .modal-backdrop, .cart-drawer-backdrop { display: none !important; }
    #internshipReportView { display: block !important; }
    #storeView, #adminView, #ordersLookupView, #systemDocsView { display: none !important; }
    body { background: #ffffff !important; color: #000000 !important; }
    .report-header-card, .week-card { border: 1px solid #ccc !important; box-shadow: none !important; break-inside: avoid; }
}

/* RESPONSIVE */
@media (max-width: 1024px) {
    .hero-container { grid-template-columns: 1fr; }
    .report-header-card { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    .topbar-left { display: none; }
    .navbar-container { flex-direction: column; align-items: stretch; gap: 12px; }
    .main-tabs { justify-content: center; overflow-x: auto; }
    .main-tab-btn { font-size: 0.78rem; padding: 6px 10px; }
    .week-content-grid { grid-template-columns: 1fr; }
    .report-summary-stats { grid-template-columns: 1fr; }
    .hero-title { font-size: 1.8rem; }
    .quick-view-grid { grid-template-columns: 1fr; }
    .form-row { flex-direction: column; }
    .footer-grid { grid-template-columns: 1fr; }
}