:root {
            --primary-blue: #1677FF;
            --gradient-blue: linear-gradient(135deg, #0052D4 0%, #4364F7 50%, #6FB1FC 100%);
            --dark-navy: #051A39;
            --text-main: #1E293B;
            --text-muted: #64748B;
            --bg-secondary: #F8FAFC;
            --bg-tertiary: #E2E8F0;
            --card-bg: #FFFFFF;
            --border: #E2E8F0;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Be Vietnam Pro', sans-serif;
        }

        body {
            background-color: #FFFFFF;
            color: var(--text-main);
            min-height: 100vh;
            overflow-x: hidden;
        }

        .container {
            max-width: 1340px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* --- HEADER NAVBAR --- */
        .header {
            background-color: var(--dark-navy);
            color: white;
            padding: 20px 0;
        }

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

        .logo-container {
            display: flex;
            align-items: center;
            gap: 12px;
            text-decoration: none;
            color: white;
        }

        .logo-title {
            font-size: 26px;
            font-weight: 800;
            letter-spacing: 0.5px;
            line-height: 1.1;
        }

        .logo-subtitle {
            font-size: 11px;
            color: #94A3B8;
            font-weight: 500;
        }

        .nav-list {
            display: flex;
            align-items: center;
            gap: 36px;
            list-style: none;
        }

        .nav-list li a {
            font-weight: 600;
            font-size: 16px;
            color: #CBD5E1;
            text-decoration: none;
            transition: color 0.2s;
        }

        .nav-list li a:hover {
            color: #38BDF8;
        }

        .btn-signup {
            background-color: var(--primary-blue);
            color: white !important;
            padding: 12px 26px;
            border-radius: 8px;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-weight: 700 !important;
        }

        /* --- HERO SECTION --- */
        .hero {
            background-image:url('../images/hero-bg.jpg'); 
            background-size: cover;
            background-position: right center; 
            background-repeat: no-repeat;
            padding: 120px 0; 
            min-height: 660px;
            display: flex;
            align-items: center;
            width: 100%;
        }

        .hero-fluid-container {
            width: 100%;
            padding-left: 60px; 
            padding-right: 60px;
        }

        .hero-text {
            max-width: 560px; 
            display: flex;
            flex-direction: column;
            align-items: flex-start; 
            text-align: left;
        }

        .badge {
            display: inline-block;
            background-color: #E6F4FF;
            color: var(--primary-blue);
            padding: 6px 18px;
            border-radius: 20px;
            font-size: 14px;
            font-weight: 700;
            margin-bottom: 24px;
        }

        .hero-title {
            font-size: 42px; 
            font-weight: 800;
            color: var(--dark-navy);
            line-height: 1.25;
            margin-bottom: 24px;
            letter-spacing: -0.5px;
        }

        .hero-title span {
            color: var(--primary-blue);
        }

        .hero-desc {
            font-size: 16px;
            color: #475569;
            margin-bottom: 40px;
            line-height: 1.6;
        }

        .hero-buttons {
            display: flex;
            justify-content: flex-start;
            gap: 16px;
            margin-bottom: 48px;
            width: 100%;
        }

        .btn-main {
            background: var(--gradient-blue);
            color: white;
            padding: 16px 36px;
            border-radius: 8px;
            font-weight: 700;
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            box-shadow: 0 4px 14px rgba(67, 100, 247, 0.3);
        }

        .btn-sub {
            background-color: white;
            color: var(--primary-blue);
            padding: 16px 36px;
            border-radius: 8px;
            font-weight: 700;
            text-decoration: none;
            border: 1px solid #CBD5E1;
        }

        .hero-stats {
            display: flex;
            justify-content: flex-start;
            gap: 32px;
            width: 100%;
        }

        .stat-item {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .stat-item iconify-icon {
            font-size: 22px;
            color: var(--primary-blue);
            background: white;
            padding: 10px;
            border-radius: 50%;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
        }

        .stat-text h4 {
            font-size: 18px;
            font-weight: 700;
            color: var(--dark-navy);
        }

        .stat-text p {
            font-size: 12px;
            color: var(--text-muted);
            white-space: nowrap;
        }

        /* --- FEATURES SECTION --- */
        .features {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            margin: 60px 0;
        }

        .feature-card {
            background-color: white;
            padding: 26px;
            border-radius: 14px;
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.02);
            display: flex;
            align-items: flex-start;
            gap: 16px;
            border: 1px solid #F1F5F9;
        }

        .feature-icon-wrapper {
            background-color: #F0F7FF;
            padding: 12px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }

        .feature-card iconify-icon {
            font-size: 26px;
        }

        .feature-info h3 {
            font-size: 16px;
            font-weight: 700;
            color: var(--dark-navy);
            margin-bottom: 6px;
        }

        .feature-info p {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.5;
        }

        /* --- COUNTDOWN SECTION --- */
        .countdown {
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: #EBF4FF;
            padding: 32px 48px;
            border-radius: 16px;
            margin-bottom: 60px;
            border: 1px solid #D6E8FC;
        }

        .countdown-info {
            display: flex;
            align-items: center;
            gap: 24px;
        }

        .calendar-icon-box {
            background: white;
            padding: 18px;
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 6px 16px rgba(22, 119, 255, 0.05);
            color: var(--primary-blue);
        }

        .countdown-text h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--dark-navy);
            line-height: 1.3;
            margin-bottom: 0;
        }

        .countdown-text h4 {
            font-size: 18px;
            font-weight: 700;
            color: var(--primary-blue);
            line-height: 1.3;
            margin-bottom: 8px;
            margin-top: 4px;
        }

        .countdown-text p {
            font-size: 14px;
            color: #475569;
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .countdown-timer {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .timer-unit {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 8px;
        }

        .timer-box {
            background-color: white;
            color: var(--primary-blue);
            font-size: 38px;
            font-weight: 700;
            width: 95px;
            height: 80px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 12px;
            box-shadow: 0 4px 12px rgba(22, 119, 255, 0.04);
        }

        .timer-label {
            font-size: 12px;
            font-weight: 700;
            color: var(--text-muted);
        }

        .timer-colon {
            font-size: 32px;
            color: var(--primary-blue);
            font-weight: 700;
            margin-bottom: 26px;
        }

        /* --- RESPONSIVE --- */
        @media (max-width: 992px) {
    .hero { 
        background-image: linear-gradient(
            to bottom,
            #EDF5FF 0%,
            #EDF5FF 55%,
            rgba(237, 245, 255, 0.6) 75%,
            transparent 100%
        ),
        url('../images/hero-bg.jpg');
                background-position: center bottom; 
                background-size: cover;
                padding: 50px 0; 
            }
            .hero-fluid-container { padding-left: 24px; padding-right: 24px; }
            .hero-text { max-width: 100%; text-align: center; align-items: center; }
            .hero-text .hero-desc { color: #0F172A !important; font-weight: 600 !important; text-shadow: 0 1px 2px rgba(255, 255, 255, 0.8); }
            .hero-buttons { justify-content: center; }
            .hero-stats { justify-content: center; flex-wrap: wrap; }
            .features { grid-template-columns: repeat(2, 1fr); }
            .countdown { flex-direction: column; gap: 30px; text-align: center; }
            .countdown-info { flex-direction: column; }
            .courses-grid { grid-template-columns: repeat(2, 1fr); }
            .cta-section { flex-direction: column; text-align: center; }
            .cta-image { margin-top: 40px; }
            .footer-content { grid-template-columns: 1fr; gap: 40px; }
        }

        @media (max-width: 576px) {
            .features { grid-template-columns: 1fr; }
            .header-content { flex-direction: column; gap: 16px; }
            .nav-list { flex-wrap: wrap; justify-content: center; gap: 16px; }
            .hero-title { font-size: 32px; }
            .hero-buttons { flex-direction: column; gap: 12px; width: 100%; }
            .btn-main, .btn-sub { width: 100%; justify-content: center; }
            .courses-grid { grid-template-columns: 1fr; }
            .countdown-timer { flex-wrap: wrap; }
            .timer-box { width: 70px; height: 60px; font-size: 28px; }
        }

/* =========================
   COURSES SECTION
========================= */

.courses-section {
    margin: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 50px;
}

.section-badge {
    display: inline-block;
    background: linear-gradient(135deg, #E6F4FF 0%, #FFF7ED 100%);
    color: var(--primary-blue);
    padding: 8px 20px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 700;
    margin-bottom: 16px;
    letter-spacing: 0.5px;
}

.section-title {
    font-size: 36px;
    font-weight: 800;
    color: var(--dark-navy);
    margin-bottom: 12px;
    line-height: 1.2;
}

.section-desc {
    font-size: 16px;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto;
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.course-card {
    background: white;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
    transition: transform 0.3s, box-shadow 0.3s;
    border: 1px solid #F1F5F9;
}

.course-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 16px 40px rgba(22, 119, 255, 0.15);
}

.course-image {
    position: relative;
    height: 220px;
    overflow: hidden;
}

.course-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s;
}

.course-card:hover .course-image img {
    transform: scale(1.1);
}

.course-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    background: var(--primary-blue);
    color: white;
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 700;
}

.course-badge-green {
    background: #10B981;
}

.course-badge-orange {
    background: #F59E0B;
}

.course-content {
    padding: 24px;
}

.course-title {
    font-size: 19px;
    font-weight: 700;
    color: var(--dark-navy);
    margin-bottom: 12px;
    line-height: 1.4;
}

.course-description {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 20px;
}

.course-meta {
    display: flex;
    gap: 16px;
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 1px solid #F1F5F9;
}

.course-meta span {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 600;
}

.course-meta iconify-icon {
    font-size: 16px;
    color: var(--primary-blue);
}

.course-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--gradient-blue);
    color: white;
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 700;
    text-decoration: none;
    font-size: 14px;
    transition: transform 0.2s;
}

.course-btn:hover {
    transform: translateX(4px);
}

/* =========================
   CTA SECTION
========================= */

.cta-section {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 60px;
    background: linear-gradient(135deg, #EBF4FF 0%, #FFF7ED 100%);
    padding: 60px;
    border-radius: 24px;
    margin: 80px 0;
    border: 1px solid #D6E8FC;
}

.cta-content {
    flex: 1;
}

.cta-title {
    font-size: 36px;
    font-weight: 800;
    color: var(--dark-navy);
    margin-bottom: 16px;
    line-height: 1.3;
}

.cta-desc {
    font-size: 16px;
    color: #475569;
    line-height: 1.7;
    margin-bottom: 32px;
}

.cta-buttons {
    display: flex;
    gap: 16px;
}

.cta-btn-primary {
    background: var(--gradient-blue);
    color: white;
    padding: 16px 36px;
    border-radius: 8px;
    font-weight: 700;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 8px 20px rgba(67, 100, 247, 0.3);
    transition: transform 0.2s;
}

.cta-btn-primary:hover {
    transform: translateY(-2px);
}

.cta-btn-secondary {
    background: white;
    color: var(--primary-blue);
    padding: 16px 36px;
    border-radius: 8px;
    font-weight: 700;
    text-decoration: none;
    border: 2px solid var(--primary-blue);
    transition: all 0.2s;
}

.cta-btn-secondary:hover {
    background: var(--primary-blue);
    color: white;
}

.cta-image {
    flex-shrink: 0;
}

.cta-image img {
    width: 400px;
    height: 400px;
    object-fit: cover;
    border-radius: 20px;
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.1);
}

/* =========================
   FOOTER
========================= */

.footer {
    background: var(--dark-navy);
    color: white;
    padding: 60px 0 30px;
    margin-top: 80px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-brand {
    max-width: 350px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.footer-logo-title {
    font-size: 24px;
    font-weight: 800;
    letter-spacing: 0.5px;
}

.footer-logo-subtitle {
    font-size: 11px;
    color: #94A3B8;
    font-weight: 500;
}

.footer-desc {
    font-size: 14px;
    color: #94A3B8;
    line-height: 1.7;
}

.footer-links {
    display: contents;
}

.footer-column h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 20px;
    color: white;
}

.footer-column a {
    display: block;
    font-size: 14px;
    color: #94A3B8;
    text-decoration: none;
    margin-bottom: 12px;
    transition: color 0.2s;
}

.footer-column a:hover {
    color: #38BDF8;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 30px;
    border-top: 1px solid #1E3A5F;
    font-size: 14px;
    color: #94A3B8;
}

.footer-bottom-links {
    display: flex;
    gap: 24px;
}

.footer-bottom-links a {
    color: #94A3B8;
    text-decoration: none;
    transition: color 0.2s;
}

.footer-bottom-links a:hover {
    color: #38BDF8;
}
/* =========================
   USER MENU SKY EDU PRO
========================= */

.account-btn{
    background:#1677FF;
    color:#fff !important;
    padding:12px 22px;
    border-radius:10px;
    font-weight:700;
}

.user-btn{
    display:flex;
    align-items:center;
    gap:12px;
    text-decoration:none;
    color:white;
}

.nav-avatar{
    width:42px;
    height:42px;

    border-radius:50%;

    background:linear-gradient(
        135deg,
        #2563EB,
        #38BDF8
    );

    display:flex;
    align-items:center;
    justify-content:center;

    font-size:18px;
    font-weight:800;
    color:white;

    box-shadow:
    0 8px 18px rgba(37,99,235,.35);
}

.user-info{
    display:flex;
    flex-direction:column;
    line-height:1.2;
}

.user-label{
    font-size:11px;
    color:#94A3B8;
}

.user-name{
    font-size:15px;
    font-weight:700;
    color:white;
}

.user-arrow{
    font-size:12px;
    color:#CBD5E1;
}

/* DROPDOWN */

.dropdown-menu{

    position:absolute;
    top:65px;
    right:0;

    width:340px;

    background:#fff;

    border-radius:20px;

    overflow:hidden;

    border:1px solid #E2E8F0;

    box-shadow:
    0 12px 40px rgba(5,26,57,.15);

    display:none;

    z-index:9999;
    animation: dropdownSlide 0.25s ease;
}

@keyframes dropdownSlide {
    from {
        opacity: 0;
        transform: translateY(-12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.show{
    display:block;
}

/* HEADER */

.dropdown-header{
    padding:26px 22px;
    display:flex;
    align-items:center;
    gap:16px;

    background:linear-gradient(
        135deg,
        #1e3a8a 0%,
        #1e40af 100%
    );

    border-bottom:none;
}
.dropdown-avatar{

    width:60px;
    height:60px;

    border-radius:50%;

    background:rgba(255,255,255,.2);
    backdrop-filter:blur(10px);

    color:white;

    font-size:26px;
    font-weight:800;

    display:flex;
    align-items:center;
    justify-content:center;

    border:3px solid rgba(255,255,255,.3);
    
    flex-shrink:0;
    overflow:hidden;
}

.dropdown-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.dropdown-header strong{

    display:block;

    font-size:19px;

    color:#FFFFFF;

    font-weight:800;

    margin-bottom:4px;
}

.dropdown-header p{

    color:rgba(255,255,255,.8);

    font-size:13px;

    margin:0;
}

/* MENU ITEMS */

.dropdown-menu a{

    display:flex;
    align-items:center;
    gap:14px;

    padding:15px 22px;

    color:#1E293B !important;

    font-weight:700;
    font-size:15px;

    text-decoration:none;

    transition:all .2s ease;
}
.dropdown-menu a:hover{

    background:#F1F5F9;

    padding-left:26px;
}

.dropdown-menu a:last-child{

    color:#DC2626 !important;
    border-top:1px solid #F1F5F9;
}

.dropdown-menu a:last-child:hover{

    background:#FEE2E2;
}

/* =========================
   NEW FEATURES - SKY EDU 2.0
========================= */

/* Toast Notifications */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 99999;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.notification-toast {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 24px;
    background: white;
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.15);
    animation: slideInRight 0.3s ease;
    font-weight: 600;
    min-width: 300px;
}

.notification-toast.exit {
    animation: fadeOut 0.3s ease forwards;
}

.notification-toast.success { border-left: 4px solid #10B981; }
.notification-toast.error { border-left: 4px solid #EF4444; }
.notification-toast.warning { border-left: 4px solid #F59E0B; }
.notification-toast.info { border-left: 4px solid #1677FF; }

.toast-icon { font-size: 20px; }
.toast-message { flex: 1; }

/* XP & Streak Bar */
.xp-streak-bar {
    display: flex;
    justify-content: center;
    gap: 40px;
    padding: 12px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
}

.xp-streak-bar > div {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--card-bg);
    border-radius: 20px;
    font-weight: 700;
}

.xp-icon, .streak-icon { font-size: 20px; }

/* Gamification Section */
.gamification-preview {
    padding: 40px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 30px;
}

.section-header h2 {
    font-size: 32px;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.section-header p {
    color: var(--text-muted);
    font-size: 16px;
}

.gamification-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.gamify-card {
    background: var(--card-bg);
    border-radius: 16px;
    border: 1px solid var(--border);
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.gamify-icon {
    font-size: 48px;
}

.gamify-content {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.gamify-value {
    font-size: 36px;
    font-weight: 800;
    color: var(--text-primary);
}

.gamify-label {
    font-size: 14px;
    color: var(--text-muted);
    font-weight: 600;
}

.gamify-progress {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.progress-bar-bg {
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), #38BDF8);
    border-radius: 4px;
    transition: width 0.5s ease;
}

.progress-text {
    font-size: 12px;
    color: var(--text-muted);
}

.streak-flames {
    display: flex;
    gap: 4px;
}

.streak-flames .flame {
    font-size: 24px;
    transition: all 0.3s ease;
}

.badges-preview {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.badge-slot {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.badge-slot.earned {
    background: linear-gradient(135deg, rgba(255, 215, 0, 0.2), rgba(255, 215, 0, 0.1));
    border: 2px solid rgba(255, 215, 0, 0.3);
}

.badge-slot.locked {
    background: var(--bg-secondary);
    opacity: 0.6;
}

/* Page Header */
.page-header {
    text-align: center;
    margin-bottom: 40px;
}

.page-header h1 {
    font-size: 40px;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.page-header p {
    font-size: 18px;
    color: var(--text-muted);
}

/* Loading Skeleton */
.loading-skeleton {
    padding: 20px;
}

.skeleton {
    background: linear-gradient(90deg, var(--bg-secondary) 25%, var(--bg-tertiary) 50%, var(--bg-secondary) 75%);
    background-size: 200% 100%;
    animation: skeleton 1.5s infinite;
    border-radius: 12px;
}

@keyframes skeleton {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* Dashboard Stats */
.dashboard-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}
.stat-card-animated {
    background: white;
    border-radius: 16px;
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 16px;
    box-shadow: 0 4px 12px rgba(5, 26, 57, 0.06);
    border: 1px solid #E2E8F0;
    transition: transform 0.2s, box-shadow 0.2s;
}
.stat-card-animated:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(22, 119, 255, 0.12);
}
.stat-icon {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    color: white;
    flex-shrink: 0;
}
.stat-content {
    flex: 1;
    min-width: 0;
}
.stat-value {
    font-size: 28px;
    font-weight: 800;
    color: #0F172A;
    line-height: 1.1;
}
.stat-label {
    font-size: 13px;
    color: #64748B;
    margin-top: 4px;
    font-weight: 500;
}
.stat-trend {
    font-size: 12px;
    color: #10B981;
    font-weight: 600;
    margin-top: 4px;
}

/* Dashboard Chart & Sections */
.dashboard-charts {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 24px;
    margin-bottom: 30px;
}
.chart-card {
    background: white;
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 4px 12px rgba(5, 26, 57, 0.06);
    border: 1px solid #E2E8F0;
}
.chart-card h3 {
    font-size: 16px;
    font-weight: 700;
    color: #0F172A;
    margin-bottom: 16px;
}
.chart-container {
    position: relative;
    height: 280px;
}

.history-section, .achievements-section {
    background: white;
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 4px 12px rgba(5, 26, 57, 0.06);
    border: 1px solid #E2E8F0;
    margin-bottom: 24px;
}
.history-section h3, .achievements-section h3 {
    font-size: 16px;
    font-weight: 700;
    color: #0F172A;
    margin-bottom: 16px;
}
.history-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.history-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px 16px;
    background: #F8FAFC;
    border-radius: 10px;
    border: 1px solid #E2E8F0;
}
.history-item-info {
    flex: 1;
}
.history-item-name {
    font-weight: 700;
    color: #0F172A;
    font-size: 14px;
}
.history-item-date {
    font-size: 12px;
    color: #64748B;
    margin-top: 2px;
}
.history-item-score {
    font-size: 18px;
    font-weight: 800;
    color: #1677FF;
}
.empty-state {
    text-align: center;
    color: #64748B;
    padding: 30px 10px;
    font-size: 14px;
}

.badges-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 14px;
}
.badge-card {
    background: #F8FAFC;
    border-radius: 12px;
    padding: 16px 8px;
    text-align: center;
    border: 1px solid #E2E8F0;
    transition: transform 0.2s;
}
.badge-card.unlocked {
    background: linear-gradient(135deg, #FEF3C7 0%, #FED7AA 100%);
    border-color: #F59E0B;
}
.badge-card:hover {
    transform: translateY(-3px);
}
.badge-card-icon {
    font-size: 32px;
    margin-bottom: 6px;
}
.badge-card-name {
    font-size: 12px;
    font-weight: 700;
    color: #0F172A;
}

@media (max-width: 768px) {
    .dashboard-charts {
        grid-template-columns: 1fr;
    }
}

/* Leaderboard */
.leaderboard-container {
    background: white;
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 4px 12px rgba(5, 26, 57, 0.06);
    border: 1px solid #E2E8F0;
}
.leaderboard-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.leaderboard-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 14px 16px;
    background: #F8FAFC;
    border-radius: 12px;
    border: 1px solid #E2E8F0;
}
.leaderboard-item.rank-1 { background: linear-gradient(135deg, #FEF3C7 0%, #FCD34D 100%); border-color: #F59E0B; }
.leaderboard-item.rank-2 { background: linear-gradient(135deg, #F1F5F9 0%, #E2E8F0 100%); border-color: #94A3B8; }
.leaderboard-item.rank-3 { background: linear-gradient(135deg, #FED7AA 0%, #FB923C 100%); border-color: #C2410C; }
.leaderboard-item.current-user {
    border: 2px solid #1677FF;
    background: #EFF6FF;
}
.leaderboard-rank {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 16px;
    background: white;
    color: #0F172A;
    flex-shrink: 0;
}
.leaderboard-info {
    flex: 1;
    min-width: 0;
}
.leaderboard-name {
    font-weight: 700;
    color: #0F172A;
    font-size: 15px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.leaderboard-meta {
    font-size: 12px;
    color: #64748B;
    margin-top: 2px;
}
.leaderboard-xp {
    font-size: 18px;
    font-weight: 800;
    color: #1677FF;
}

/* Responsive */
@media (max-width: 768px) {
    .gamification-cards {
        grid-template-columns: 1fr;
    }
    
    .xp-streak-bar {
        flex-wrap: wrap;
        gap: 10px;
    }
    
    .page-header h1 {
        font-size: 28px;
    }
}

/* =========================
   SKY EDU 2.0 - UTILITY CLASSES
========================= */

/* Sky Card - dùng chung cho mọi trang */
.sky-card {
    background: var(--card-bg, #FFFFFF);
    border: 1px solid var(--border, #E2E8F0);
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 4px 12px rgba(5, 26, 57, 0.04);
    transition: all .3s;
}
.sky-card:hover { box-shadow: 0 8px 24px rgba(5, 26, 57, 0.08); }
.sky-card-elevated { box-shadow: 0 12px 32px rgba(5, 26, 57, 0.08); }

/* Sky Grid layouts */
.sky-grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.sky-grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.sky-grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.sky-grid-6 { display: grid; grid-template-columns: repeat(6, 1fr); gap: 16px; }
.sky-grid-auto { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 20px; }

@media (max-width: 1024px) {
    .sky-grid-3, .sky-grid-4, .sky-grid-6 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
    .sky-grid-2, .sky-grid-3, .sky-grid-4, .sky-grid-6 { grid-template-columns: 1fr; }
}

/* Sky Stat card */
.sky-stat-card {
    display: flex; align-items: center; gap: 14px;
    padding: 20px; border-radius: 16px;
    background: var(--card-bg, #FFFFFF);
    border: 1px solid var(--border, #E2E8F0);
    box-shadow: 0 4px 12px rgba(5,26,57,0.04);
    transition: all .3s;
    position: relative; overflow: hidden;
}
.sky-stat-card:hover { transform: translateY(-4px); box-shadow: 0 12px 24px rgba(5,26,57,0.1); }
.sky-stat-icon {
    width: 52px; height: 52px; border-radius: 14px;
    display: flex; align-items: center; justify-content: center;
    font-size: 24px; color: white; flex-shrink: 0;
    box-shadow: 0 6px 16px rgba(0,0,0,0.12);
}
.sky-stat-value { font-size: 22px; font-weight: 800; color: var(--text-primary, #0F172A); line-height: 1.1; }
.sky-stat-label { font-size: 12px; color: var(--text-muted, #94A3B8); font-weight: 600; margin-top: 2px; }

/* Sky Empty state */
.sky-empty {
    text-align: center; padding: 40px 20px;
    color: var(--text-muted, #94A3B8); font-size: 14px;
}
.sky-empty-icon { font-size: 48px; margin-bottom: 12px; }

/* Sky Podium - layout 3 bậc thang */
.sky-podium {
    display: grid;
    grid-template-columns: 1fr 1.1fr 1fr;
    gap: 16px; align-items: end;
    max-width: 800px; margin: 0 auto;
    padding: 24px 0;
}
.sky-podium-slot {
    background: var(--card-bg, #FFFFFF);
    border-radius: 16px;
    padding: 20px 14px;
    text-align: center;
    box-shadow: 0 8px 24px rgba(0,0,0,0.06);
    transition: transform .3s;
}
.sky-podium-slot:hover { transform: translateY(-6px); }
.sky-podium-slot.first { padding: 28px 18px; background: linear-gradient(180deg, rgba(255,215,0,0.12), var(--card-bg, #FFFFFF)); border: 2px solid #FFD700; }
.sky-podium-slot.second { background: linear-gradient(180deg, rgba(192,192,192,0.12), var(--card-bg, #FFFFFF)); border: 2px solid #C0C0C0; }
.sky-podium-slot.third { background: linear-gradient(180deg, rgba(205,127,50,0.12), var(--card-bg, #FFFFFF)); border: 2px solid #CD7F32; }

/* Sky Section title */
.sky-section-title {
    font-size: 18px; font-weight: 800;
    color: var(--text-primary, #0F172A);
    margin: 0 0 16px; display: flex; align-items: center; gap: 8px;
}

/* Sky Button extensions */
.sky-btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 10px 18px; border-radius: 8px;
    font-weight: 700; font-size: 13px;
    border: none; cursor: pointer;
    transition: all .2s; text-decoration: none;
}
.sky-btn-primary { background: linear-gradient(135deg, #1677FF, #4364F7); color: white; }
.sky-btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(22,119,255,0.3); }
.sky-btn-secondary { background: var(--bg-secondary, #F8FAFC); color: var(--text-primary, #0F172A); }
.sky-btn-secondary:hover { background: var(--bg-tertiary, #E2E8F0); }
.sky-btn-danger { background: #FEE2E2; color: #DC2626; }
.sky-btn-danger:hover { background: #FECACA; }

/* Sky Tag */
.sky-tag {
    display: inline-flex; align-items: center; gap: 4px;
    padding: 3px 10px; border-radius: 999px;
    font-size: 11px; font-weight: 700;
    background: var(--bg-secondary, #F8FAFC);
    color: var(--text-secondary, #475569);
}

/* Sky Progress bar */
.sky-progress {
    width: 100%; height: 8px;
    background: var(--bg-tertiary, #E2E8F0);
    border-radius: 999px; overflow: hidden;
}
.sky-progress-fill {
    height: 100%; border-radius: 999px;
    background: linear-gradient(90deg, #1677FF, #4364F7);
    transition: width .8s ease;
}

/* Sky Avatar */
.sky-avatar {
    width: 48px; height: 48px; border-radius: 50%;
    background: linear-gradient(135deg, #1677FF, #38BDF8);
    color: white; font-weight: 800; font-size: 18px;
    display: flex; align-items: center; justify-content: center;
    overflow: hidden; flex-shrink: 0;
}
.sky-avatar img { width: 100%; height: 100%; object-fit: cover; }
.sky-avatar-sm { width: 36px; height: 36px; font-size: 14px; }
.sky-avatar-lg { width: 72px; height: 72px; font-size: 28px; }
.sky-avatar-xl { width: 96px; height: 96px; font-size: 36px; border: 4px solid rgba(255,255,255,0.4); }

/* Animations - dùng chung */
.sky-fade-in { animation: skyFadeIn .5s ease forwards; }
.sky-slide-up { animation: skySlideUp .5s ease forwards; opacity: 0; }

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

/* Hover lift effect */
.sky-hover-lift { transition: all .25s; }
.sky-hover-lift:hover { transform: translateY(-4px); box-shadow: 0 12px 24px rgba(0,0,0,0.08); }

/* Glow */
.sky-glow { box-shadow: 0 0 0 4px rgba(22, 119, 255, 0.1); }