/* ==========================================================================
   Tes Avriobridge - Modern Student Portal & Global Styling
   ========================================================================== */

:root {
    --primary: #0D9488;
    --primary-dark: #0F766E;
    --primary-light: #2DD4BF;
    --primary-soft: rgba(13, 148, 136, 0.1);
    --primary-grad: linear-gradient(135deg, #0284C7 0%, #0D9488 50%, #059669 100%);
    --primary-grad-hover: linear-gradient(135deg, #0369A1 0%, #0F766E 50%, #047857 100%);
    --dark-grad: linear-gradient(145deg, #0B1329 0%, #0F172A 40%, #134E4A 100%);
    --teal: #0D9488;
    --cyan: #0284C7;
    --emerald: #059669;
    --dark: #0F172A;
    --dark-surface: #1E293B;
    --gray-50: #F8FAFC;
    --gray-100: #F1F5F9;
    --gray-200: #E2E8F0;
    --gray-300: #CBD5E1;
    --gray-400: #94A3B8;
    --gray-500: #64748B;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1E293B;
    --gray-900: #0F172A;
    --success: #10B981;
    --warning: #F59E0B;
    --danger: #EF4444;
    --card-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05), 0 2px 6px -1px rgba(15, 23, 42, 0.03);
    --card-shadow-hover: 0 20px 30px -8px rgba(13, 148, 136, 0.12), 0 8px 12px -3px rgba(15, 23, 42, 0.05);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-2xl: 24px;
}

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

body {
    font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--gray-50);
    color: var(--gray-700);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Typography & Utilities */
.fw-extrabold { font-weight: 800; }
.text-teal { color: var(--teal) !important; }
.text-cyan { color: var(--cyan) !important; }
.text-emerald { color: var(--emerald) !important; }
.bg-teal-soft { background-color: rgba(13, 148, 136, 0.1) !important; color: var(--teal) !important; }
.bg-cyan-soft { background-color: rgba(2, 132, 199, 0.1) !important; color: var(--cyan) !important; }
.bg-emerald-soft { background-color: rgba(16, 185, 129, 0.1) !important; color: var(--emerald) !important; }
.bg-amber-soft { background-color: rgba(245, 158, 11, 0.1) !important; color: #D97706 !important; }

.shadow-xs { box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04); }
.shadow-card { box-shadow: var(--card-shadow); }

/* Buttons */
.btn-gradient {
    background: var(--primary-grad) !important;
    color: #FFFFFF !important;
    border: none !important;
    font-weight: 700;
    box-shadow: 0 4px 14px rgba(13, 148, 136, 0.3);
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.btn-gradient:hover {
    background: var(--primary-grad-hover) !important;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(13, 148, 136, 0.4);
    color: #FFFFFF !important;
}

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

.btn-teal {
    background-color: var(--teal);
    color: #fff;
    border: none;
    font-weight: 600;
    transition: all 0.2s;
}

.btn-teal:hover {
    background-color: var(--primary-dark);
    color: #fff;
    transform: translateY(-1px);
}

.btn-outline-teal {
    border: 1.5px solid var(--teal);
    color: var(--teal);
    font-weight: 600;
    background: transparent;
    transition: all 0.2s;
}

.btn-outline-teal:hover {
    background-color: var(--teal);
    color: #fff;
    border-color: var(--teal);
}

/* Card Enhancements */
.card-modern {
    background: #FFFFFF;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-xl);
    box-shadow: var(--card-shadow);
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.card-modern:hover {
    border-color: rgba(13, 148, 136, 0.3);
    box-shadow: var(--card-shadow-hover);
}

.hover-lift {
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.hover-lift:hover {
    transform: translateY(-4px);
    box-shadow: var(--card-shadow-hover);
}

/* Modern Navbar */
.student-navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--gray-200);
    position: sticky;
    top: 0;
    z-index: 1020;
    transition: all 0.2s ease;
}

.student-navbar .nav-link {
    font-weight: 600;
    font-size: 14px;
    color: var(--gray-600);
    padding: 8px 16px !important;
    border-radius: 10px;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 7px;
}

.student-navbar .nav-link:hover {
    color: var(--teal);
    background-color: rgba(13, 148, 136, 0.08);
}

.student-navbar .nav-link.active {
    color: var(--teal);
    background-color: rgba(13, 148, 136, 0.12);
    font-weight: 700;
}

.user-nav-badge {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--primary-grad);
    color: #FFFFFF;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 14px;
    box-shadow: 0 2px 8px rgba(13, 148, 136, 0.3);
}

/* Hero Banners */
.hero-gradient-dark {
    background: var(--dark-grad);
    color: #FFFFFF;
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-2xl);
}

.hero-gradient-teal {
    background: var(--primary-grad);
    color: #FFFFFF;
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-2xl);
}

/* Progress Bars */
.progress-modern {
    height: 10px;
    background-color: #E2E8F0;
    border-radius: 999px;
    overflow: hidden;
}

.progress-modern .progress-bar {
    background: var(--primary-grad);
    border-radius: 999px;
    transition: width 0.6s ease;
}

/* Learning Stepper / Timeline */
.step-card {
    background: #FFFFFF;
    border: 1.5px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 18px;
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    text-decoration: none !important;
    display: block;
    height: 100%;
}

.step-card.active {
    border-color: var(--teal);
    background: linear-gradient(180deg, #FFFFFF 0%, #F0FDFA 100%);
    box-shadow: 0 8px 24px -4px rgba(13, 148, 136, 0.18);
    transform: translateY(-2px);
}

.step-card.completed {
    border-color: rgba(16, 185, 129, 0.4);
    background: linear-gradient(180deg, #FFFFFF 0%, #F0FDF4 100%);
}

.step-card.locked {
    background: var(--gray-100);
    opacity: 0.75;
    cursor: not-allowed;
}

.step-icon-badge {
    width: 32px;
    height: 32px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 700;
    flex-shrink: 0;
}

.step-icon-badge.active {
    background: var(--primary-grad);
    color: #FFFFFF;
    box-shadow: 0 4px 10px rgba(13, 148, 136, 0.35);
}

.step-icon-badge.completed {
    background: #10B981;
    color: #FFFFFF;
}

.step-icon-badge.locked {
    background: #CBD5E1;
    color: #64748B;
}

/* Stat Widget Cards */
.stat-widget {
    background: #FFFFFF;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-xl);
    padding: 20px;
    box-shadow: var(--card-shadow);
    display: flex;
    align-items: center;
    gap: 16px;
    transition: all 0.25s ease;
}

.stat-widget:hover {
    transform: translateY(-3px);
    box-shadow: var(--card-shadow-hover);
    border-color: rgba(13, 148, 136, 0.3);
}

.stat-widget-icon {
    width: 48px;
    height: 48px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    flex-shrink: 0;
}

/* CBT Exam Interfaces */
.exam-navbar {
    background: var(--dark);
    color: #FFFFFF;
    padding: 14px 24px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.timer-badge-live {
    background: rgba(239, 68, 68, 0.15);
    color: #EF4444;
    border: 1px solid rgba(239, 68, 68, 0.35);
    font-size: 15px;
    font-weight: 800;
    padding: 6px 16px;
    border-radius: 999px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    letter-spacing: 0.05em;
}

.cbt-option-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 20px;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    cursor: pointer;
    background: #FFFFFF;
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    margin-bottom: 12px;
    user-select: none;
}

.cbt-option-item:hover {
    border-color: var(--teal);
    background-color: rgba(13, 148, 136, 0.04);
}

.form-check-input:checked + .cbt-option-item {
    border-color: var(--teal);
    background-color: rgba(13, 148, 136, 0.08);
    color: var(--primary-dark);
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(13, 148, 136, 0.15);
}

.q-nav-pill {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    font-weight: 700;
    font-size: 13px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1.5px solid var(--gray-300);
    background: #FFFFFF;
    color: var(--gray-700);
    text-decoration: none;
    transition: all 0.2s ease;
}

.q-nav-pill:hover {
    border-color: var(--teal);
    color: var(--teal);
}

.q-nav-pill.answered {
    background: var(--primary-grad);
    color: #FFFFFF;
    border-color: transparent;
    box-shadow: 0 3px 8px rgba(13, 148, 136, 0.3);
}

.q-nav-pill.current {
    box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.3);
    border-color: var(--teal);
}

/* Mobile Adjustments */
@media (max-width: 768px) {
    .student-navbar .navbar-collapse {
        background: #FFFFFF;
        padding: 16px;
        border-radius: var(--radius-lg);
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
        margin-top: 10px;
    }
}