@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

/* ==========================================
   1. VARIABLES & SYSTEM RESET
   ========================================== */
:root {
    --bg-main: #060913;
    --bg-card: rgba(18, 26, 43, 0.75);
    --bg-glass: rgba(255, 255, 255, 0.03);
    --bg-input: rgba(0, 0, 0, 0.4);
    
    --border-glow: rgba(0, 242, 254, 0.25);
    --border-muted: rgba(255, 255, 255, 0.08);
    
    --color-primary: #00f2fe;
    --color-accent: #4facfe;
    --color-gold: #ffb703;
    --color-success: #10b981;
    --color-danger: #ef4444;
    
    --color-text: #f8fafc;
    --color-text-dim: #94a3b8;
    
    --radius-lg: 20px;
    --radius-md: 12px;
    --radius-sm: 8px;
    
    --transition-fast: 0.2s ease;
    --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Plus Jakarta Sans', sans-serif;
    -webkit-tap-highlight-color: transparent;
}

body {
    background-color: var(--bg-main);
    color: var(--color-text);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    position: relative;
}

/* Background Ambient Glow Effects */
body::before {
    content: '';
    position: fixed;
    top: -100px;
    left: -100px;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0, 242, 254, 0.08) 0%, rgba(0, 0, 0, 0) 70%);
    z-index: -1;
    pointer-events: none;
}

body::after {
    content: '';
    position: fixed;
    bottom: -100px;
    right: -100px;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(255, 183, 3, 0.05) 0%, rgba(0, 0, 0, 0) 70%);
    z-index: -1;
    pointer-events: none;
}

/* ==========================================
   2. NAVBAR & HEADER
   ========================================== */
.navbar {
    background: rgba(6, 9, 19, 0.85);
    border-bottom: 1px solid var(--border-muted);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 14px 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand-logo {
    font-size: 22px;
    font-weight: 800;
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: 10px;
    letter-spacing: -0.5px;
}

.brand-logo b {
    color: var(--color-primary);
}

.logo-icon {
    font-size: 26px;
    color: var(--color-primary);
    filter: drop-shadow(0 0 8px rgba(0, 242, 254, 0.5));
}

.user-info-bar {
    display: flex;
    align-items: center;
    gap: 15px;
}

.balance-badge {
    background: rgba(255, 183, 3, 0.1);
    border: 1px solid rgba(255, 183, 3, 0.3);
    color: var(--color-gold);
    padding: 8px 16px;
    border-radius: 30px;
    font-weight: 700;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 0 15px rgba(255, 183, 3, 0.1);
}

.user-avatar {
    font-weight: 600;
    font-size: 14px;
    color: var(--color-text);
    background: var(--bg-glass);
    border: 1px solid var(--border-muted);
    padding: 8px 14px;
    border-radius: 30px;
}

.btn-logout-icon {
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: var(--color-danger);
    width: 38px;
    height: 38px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-fast);
}

.btn-logout-icon:hover {
    background: var(--color-danger);
    color: #fff;
    transform: scale(1.05);
}

/* ==========================================
   3. NAVIGATION TABS
   ========================================== */
.main-wrapper {
    max-width: 1200px;
    margin: 30px auto;
    padding: 0 20px;
    flex: 1;
    width: 100%;
}

.tab-navigation {
    display: flex;
    gap: 12px;
    margin-bottom: 30px;
    overflow-x: auto;
    padding-bottom: 8px;
    scrollbar-width: none; /* Firefox */
}

.tab-navigation::-webkit-scrollbar {
    display: none; /* Chrome/Safari */
}

.tab-btn {
    background: var(--bg-card);
    border: 1px solid var(--border-muted);
    color: var(--color-text-dim);
    padding: 14px 22px;
    border-radius: var(--radius-md);
    font-weight: 700;
    font-size: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    white-space: nowrap;
    transition: var(--transition-smooth);
    backdrop-filter: blur(10px);
}

.tab-btn i {
    font-size: 16px;
}

.tab-btn:hover {
    color: var(--color-text);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.tab-btn.active {
    background: linear-gradient(135deg, rgba(0, 242, 254, 0.15), rgba(79, 172, 254, 0.15));
    border-color: var(--color-primary);
    color: var(--color-primary);
    box-shadow: 0 0 20px rgba(0, 242, 254, 0.15);
}

/* Tab Content Visibility Switch */
.tab-content {
    display: none;
    animation: fadeIn 0.35s ease-in-out;
}

.tab-content.active {
    display: block;
}

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

/* ==========================================
   4. CARDS & CONTAINERS
   ========================================== */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-muted);
    border-radius: var(--radius-lg);
    padding: 28px;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    transition: var(--transition-smooth);
}

.card:hover {
    border-color: rgba(255, 255, 255, 0.15);
}

.card-glow {
    border-color: var(--border-glow);
    box-shadow: 0 0 30px rgba(0, 242, 254, 0.08);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 16px;
    border-bottom: 1px solid var(--border-muted);
    padding-bottom: 18px;
    margin-bottom: 22px;
}

.card-header h2 {
    font-size: 20px;
    font-weight: 800;
    color: var(--color-text);
}

.card-header .subtitle {
    font-size: 13px;
    color: var(--color-text-dim);
    margin-top: 2px;
}

.card-header i {
    font-size: 24px;
}

/* Accent Icons */
.icon-blue { color: var(--color-primary); }
.icon-gold { color: var(--color-gold); }

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 25px;
}

.margin-bottom-lg {
    margin-bottom: 30px;
}

/* ==========================================
   5. TASK SECTION (VƯỢT LINK)
   ========================================== */
.task-banner {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
    background: var(--bg-glass);
    border: 1px solid var(--border-muted);
    border-radius: var(--radius-md);
    padding: 18px;
    margin-bottom: 25px;
}

.task-info-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.task-info-item .label {
    font-size: 12px;
    color: var(--color-text-dim);
    text-transform: uppercase;
    font-weight: 600;
}

.task-info-item .value {
    font-size: 15px;
    font-weight: 700;
}

.action-center {
    display: flex;
    justify-content: center;
    margin: 10px 0;
}

.task-box-hidden {
    display: none;
    animation: fadeIn 0.3s ease;
}

.link-target-box {
    background: rgba(0, 0, 0, 0.3);
    border: 1px dashed var(--border-glow);
    padding: 18px;
    border-radius: var(--radius-md);
    margin: 20px 0;
}

.link-label {
    font-size: 13px;
    color: var(--color-text-dim);
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
}

.link-input-group {
    display: flex;
    gap: 10px;
}

/* ==========================================
   6. FORMS & BUTTONS
   ========================================== */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 700;
    color: var(--color-text-dim);
    margin-bottom: 8px;
}

.form-control {
    width: 100%;
    padding: 14px 18px;
    background: var(--bg-input);
    border: 1px solid var(--border-muted);
    border-radius: var(--radius-md);
    color: #fff;
    font-size: 14px;
    outline: none;
    transition: var(--transition-fast);
}

.form-control:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 15px rgba(0, 242, 254, 0.2);
    background: rgba(0, 0, 0, 0.6);
}

.btn {
    padding: 14px 24px;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 800;
    font-size: 14px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: var(--transition-smooth);
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: #060913;
    box-shadow: 0 6px 20px rgba(0, 242, 254, 0.25);
}

.btn-gold {
    background: linear-gradient(135deg, var(--color-gold), #f39c12);
    color: #060913;
    box-shadow: 0 6px 20px rgba(255, 183, 3, 0.25);
}

.btn-success {
    background: linear-gradient(135deg, var(--color-success), #059669);
    color: #fff;
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.25);
}

.btn-large {
    width: 100%;
    padding: 16px;
    font-size: 16px;
}

.btn-sm {
    padding: 10px 18px;
    font-size: 13px;
    border-radius: var(--radius-sm);
}

.btn:hover {
    transform: translateY(-2px);
    filter: brightness(1.1);
}

.btn:active {
    transform: translateY(0);
}

/* Rules list */
.rule-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.rule-list li {
    font-size: 14px;
    line-height: 1.6;
    color: var(--color-text-dim);
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.rule-list li b {
    color: var(--color-text);
}

.rule-list li i {
    margin-top: 4px;
    font-size: 16px;
}

/* ==========================================
   7. PROFILE GRID & STATS
   ========================================== */
.profile-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
    margin-bottom: 25px;
}

.profile-info-card {
    background: var(--bg-glass);
    border: 1px solid var(--border-muted);
    padding: 18px;
    border-radius: var(--radius-md);
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.profile-info-card .p-label {
    font-size: 12px;
    color: var(--color-text-dim);
    font-weight: 600;
}

.profile-info-card .p-value {
    font-size: 16px;
    font-weight: 800;
}

/* ==========================================
   8. DATA TABLES (HISTORY & LEADERBOARD)
   ========================================== */
.table-responsive {
    width: 100%;
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
    text-align: left;
}

.data-table th {
    background: rgba(255, 255, 255, 0.02);
    color: var(--color-text-dim);
    padding: 16px;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid var(--border-muted);
}

.data-table td {
    padding: 16px;
    font-size: 14px;
    border-bottom: 1px solid var(--border-muted);
    color: var(--color-text);
}

.data-table tbody tr {
    transition: var(--transition-fast);
}

.data-table tbody tr:hover {
    background: rgba(255, 255, 255, 0.02);
}

/* Status Badges */
.badge-status {
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 800;
    display: inline-block;
    text-transform: uppercase;
}

.status-PENDING {
    background: rgba(255, 183, 3, 0.15);
    color: var(--color-gold);
    border: 1px solid rgba(255, 183, 3, 0.3);
}

.status-SUCCESS {
    background: rgba(16, 185, 129, 0.15);
    color: var(--color-success);
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.status-REJECTED {
    background: rgba(239, 68, 68, 0.15);
    color: var(--color-danger);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

/* ==========================================
   9. UTILITIES & ALERTS
   ========================================== */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-gold { color: var(--color-gold) !important; }
.text-blue { color: var(--color-primary) !important; }
.text-green { color: var(--color-success) !important; }
.text-danger { color: var(--color-danger) !important; }
.text-dim { color: var(--color-text-dim) !important; }

.divider {
    height: 1px;
    background: var(--border-muted);
    margin: 25px 0;
}

.alert {
    padding: 14px 18px;
    border-radius: var(--radius-md);
    font-size: 13px;
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    line-height: 1.5;
}

.alert-info {
    background: rgba(0, 242, 254, 0.1);
    border: 1px solid rgba(0, 242, 254, 0.3);
    color: var(--color-primary);
}

.cost-calculator-box {
    background: rgba(255, 183, 3, 0.05);
    border: 1px solid rgba(255, 183, 3, 0.2);
    padding: 14px 18px;
    border-radius: var(--radius-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    font-size: 14px;
}

.footer {
    text-align: center;
    padding: 25px;
    color: var(--color-text-dim);
    font-size: 13px;
    border-top: 1px solid var(--border-muted);
    margin-top: auto;
}

/* ==========================================
   10. RESPONSIVE BREAKPOINTS (MOBILE FIRST)
   ========================================== */
@media (max-width: 992px) {
    .grid-2 {
        grid-template-columns: 1fr;
    }
    
    .profile-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .navbar {
        padding: 10px 0;
    }
    
    .brand-logo span {
        font-size: 18px;
    }
    
    .user-avatar {
        display: none; /* Ẩn bớt tên trên mobile hẹp */
    }
    
    .card {
        padding: 20px;
        border-radius: 16px;
    }
    
    .task-banner {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .profile-grid {
        grid-template-columns: 1fr;
    }
    
    .link-input-group {
        flex-direction: column;
    }
    
    .tab-btn {
        padding: 12px 16px;
        font-size: 13px;
    }
}