/* ===== CSS Variables ===== */
:root {
    /* Professional law-themed color palette */
    --color-primary: #1a4b84;
    --color-primary-dark: #0d2d54;
    --color-primary-light: #2d6ab8;

    --color-dark: #1a1a1a;
    --color-dark-light: #2d2d2d;
    --color-gray: #666666;
    --color-gray-light: #e5e5e5;
    --color-light: #f5f5f5;
    --color-white: #ffffff;

    /* Typography */
    --font-primary: "Inter", sans-serif;
    --font-display: "Playfair Display", serif;

    /* Spacing */
    --section-padding: 80px 0;

    /* Shadows - more subtle */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.12);

    /* Transitions */
    --transition: all 0.3s ease;
}

/* ===== Global Styles ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-primary);
    color: var(--color-dark);
    line-height: 1.6;
    overflow-x: hidden;
    background-color: var(--color-light);
    background-image: linear-gradient(to right, rgba(245, 245, 245, 0.8) 0%, rgba(245, 245, 245, 0.9) 100%);
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 700;
    line-height: 1.3;
}

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

img {
    max-width: 100%;
    height: auto;
}

.section-padding {
    padding: var(--section-padding);
}

/* Removed text-gradient - using solid colors instead */
.text-gradient {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===== Section Badge ===== */
.section-badge {
    display: inline-flex;
    align-items: center;
    padding: 6px 16px;
    background: var(--color-light);
    color: var(--color-primary);
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border: 1px solid var(--color-gray-light);
}

/* ===== Section Title ===== */
.section-title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--color-dark);
}

/* ===== Quiz page: unified styling ===== */
/* Keep styles scoped and minimal to match site theme */
.exam-header { border-radius: 8px; background: #ffffff; border: 1px solid rgba(15,23,42,0.04); box-shadow: var(--shadow-sm); }
.exam-header .fw-semibold { font-family: var(--font-display); font-weight:700; color:var(--color-dark); }

.question-card { border-radius: 8px; border: 1px solid rgba(15,23,42,0.06); background: #fff; box-shadow: var(--shadow-md); }
.question-card .card-body { padding: 22px; }
.question-card h5 { font-family: var(--font-display); font-size: 1.125rem; margin-bottom: 0.5rem; color:var(--color-dark); }
.question-index { font-weight:700; color:var(--color-primary-dark); }

/* Option items - consistent with other site cards */
.option-item { display:flex; align-items:center; gap:12px; padding:14px 16px; background:#fff; border:1px solid rgba(15,23,42,0.06); border-radius:6px; cursor:pointer; transition: box-shadow .12s ease, transform .08s ease; }
.option-item:hover { box-shadow: var(--shadow-sm); transform: translateY(-2px); }
.option-item.active { border-color: var(--color-primary-dark); background: linear-gradient(90deg, rgba(11,59,92,0.03), #fff); }
.option-key-pill { min-width:36px; height:36px; border-radius:6px; display:flex; align-items:center; justify-content:center; font-weight:700; color:var(--color-primary-dark); background:#f1f5f9; }
.option-item.active .option-key-pill { background: var(--color-primary-dark); color:#fff; }
.check-icon { margin-left:auto; color:var(--color-primary-dark); display:none; }
.option-item.active .check-icon { display:inline-block; }

/* Progress bar and stats */
.progress { height:10px; border-radius:6px; background:#eef3f7; overflow:hidden; }
.progress-bar { background: linear-gradient(90deg,var(--color-primary-dark),var(--color-primary)); }

/* Sidebar: timer and question grid */
#timerRow .bg-light { background: #fbfcfd; border:1px solid rgba(15,23,42,0.03); }
#questionGrid { display:flex; flex-wrap:wrap; gap:10px; }
#questionGrid .q-grid-item { width:44px; height:44px; display:inline-flex; align-items:center; justify-content:center; border-radius:8px; border:1px solid rgba(15,23,42,0.06); background:#f7fafc; font-weight:700; }
#questionGrid .q-grid-item.active { background:var(--color-primary-dark); color:#fff; border-color:var(--color-primary-dark); box-shadow:0 8px 18px rgba(11,59,92,0.06); }
#questionGrid .q-grid-item.answered { background:#e8f6ec; color:#0f5132 }
#questionGrid .q-grid-item.flagged { background:#fff7ed; color:#92400e }

.btn-submit-large { background: linear-gradient(90deg,var(--color-primary-dark),var(--color-primary)); color:#fff; border:none; border-radius:8px; padding:12px 20px; font-weight:700 }

/* Submitted state */
.exam-submitted .option-item { pointer-events:none; opacity:0.85 }
/* ===== Auth (Login/Register) ===== */
/* Auth styles are now defined inline in each auth page for better control */
/* Keeping minimal shared styles only */

.auth-layout {
    max-width: 1120px;
}

/* ===== Chat styles ===== */
.chat-page { padding-top: 80px; }
.chat-sidebar { min-height: calc(100vh - 80px); }
.chat-column { min-height: calc(100vh - 80px); display:flex; flex-direction:column; }
.chat-header { background: linear-gradient(90deg, rgba(26,75,132,0.03), rgba(26,75,132,0.01)); }
.chat-body { background: linear-gradient(180deg, #ffffff, #f8f9fb); }
.chat-composer { background: #fff; }

.message-row { display:flex; }
.message-row.user { justify-content:flex-end; }
.message-row.ai { justify-content:flex-start; }
.message { max-width: 72%; }
.user-message { background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light)); color: #fff; border-radius: 18px 18px 6px 18px; }
.ai-message { background: #f1f5f9; color: var(--color-dark); border-radius: 18px 18px 18px 6px; }

@media (max-width: 991px) {
    .chat-sidebar { display: none; }
    .chat-column { flex: 1 1 auto; }
    .chat-body { padding: 1rem; }
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--color-gray);
    max-width: 600px;
    margin: 0 auto;
}

/* ===== Navbar ===== */
.navbar {
    padding: 0.75rem 0;
    background: var(--color-white);
    transition: var(--transition);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.navbar .container {
    max-width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
    padding-left: 2rem;
    padding-right: 2rem;
}

.navbar.scrolled {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.navbar-brand {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--color-dark) !important;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-shrink: 0;
}

.navbar-brand:hover {
    color: var(--color-primary) !important;
}

.navbar-brand img {
    height: 44px;
    width: 44px;
    object-fit: contain;
    border-radius: 50%;
    flex-shrink: 0;
    display: block;
}

.navbar-brand span {
    font-weight: 700;
    line-height: 1.2;
    white-space: nowrap;
}

.navbar-brand i {
    color: var(--color-primary);
}

/* Menu chính ở giữa */
.navbar-nav.mx-auto {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    flex-wrap: nowrap;
    margin: 0 auto !important;
    flex: 0 1 auto;
    justify-content: center;
}

/* Menu auth ở bên phải */
.navbar-nav.ms-auto {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: nowrap;
    margin: 0 !important;
    margin-left: auto !important;
    flex: 0 0 auto;
    justify-content: flex-end;
}

.navbar-nav .nav-item {
    margin: 0;
    padding: 0;
    display: flex;
    align-items: center;
}

.navbar-nav .nav-link {
    color: var(--color-dark) !important;
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.5rem 0.75rem !important;
    white-space: nowrap;
    transition: var(--transition);
    position: relative;
    line-height: 1.3;
    display: flex;
    align-items: center;
}

.navbar-nav .nav-link:hover {
    color: var(--color-primary) !important;
}

.navbar-nav .nav-link.active {
    color: var(--color-primary) !important;
    font-weight: 600;
}

.navbar-nav .nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60%;
    height: 2px;
    background: var(--color-primary);
    border-radius: 2px;
}

.navbar-nav .btn {
    font-size: 0.9rem;
    padding: 0.5rem 1rem !important;
    margin: 0;
    white-space: nowrap;
    line-height: 1.3;
    display: inline-flex;
    align-items: center;
    border-radius: 8px;
    font-weight: 600;
}

.navbar-nav .btn i {
    font-size: 0.9rem;
    margin: 0;
}

.navbar-nav .btn-sm {
    font-size: 0.85rem;
    padding: 0.5rem 1rem !important;
}

/* Avatar dropdown */
.navbar-nav .dropdown-toggle {
    padding: 0 !important;
}

.navbar-nav .dropdown-toggle img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid #1a4b84;
}

@media (max-width: 1400px) {
    .navbar .container {
        gap: 1.5rem;
        padding-left: 1.5rem;
        padding-right: 1.5rem;
    }

    .navbar-nav.mx-auto {
        gap: 0.15rem;
    }

    .navbar-nav .nav-link {
        font-size: 0.9rem;
        padding: 0.5rem 0.6rem !important;
    }

    .navbar-nav .btn {
        font-size: 0.85rem;
        padding: 0.45rem 0.9rem !important;
    }
}

@media (max-width: 1200px) {
    .navbar .container {
        gap: 1rem;
        padding-left: 1rem;
        padding-right: 1rem;
    }

    .navbar-nav.mx-auto {
        gap: 0.1rem;
    }

    .navbar-nav .nav-link {
        font-size: 0.85rem;
        padding: 0.5rem 0.5rem !important;
    }

    .navbar-brand {
        font-size: 1.25rem;
    }

    .navbar-brand img {
        height: 40px;
        width: 40px;
    }

    .navbar-nav .btn {
        font-size: 0.8rem;
        padding: 0.45rem 0.85rem !important;
    }
}

/* ===== Enhanced Mobile Navbar ===== */
@media (max-width: 991px) {
    .navbar {
        padding: 0.5rem 0;
    }
    
    .navbar .container {
        flex-wrap: wrap;
        justify-content: space-between;
        padding: 0 1rem;
        flex-direction: row;
        align-items: center;
    }
    
    .navbar-brand {
        order: 1;
        flex: 0 0 auto;
    }
    
    .navbar-toggler {
        order: 2;
        display: flex !important;
        align-items: center;
        justify-content: center;
        width: 44px;
        height: 44px;
        padding: 0;
        border: none;
        background: transparent;
        color: var(--color-dark);
        border-radius: 8px;
        transition: var(--transition);
    }
    
    .navbar-toggler:hover {
        background: var(--color-light);
    }
    
    .navbar-toggler:focus {
        box-shadow: none;
        outline: none;
    }
    
    .navbar-collapse {
        order: 3;
        width: 100%;
        background: var(--color-white);
        border-radius: 12px;
        margin-top: 0.75rem;
        box-shadow: 0 4px 20px rgba(0,0,0,0.1);
        overflow: hidden;
        max-height: calc(100vh - 70px);
        overflow-y: auto;
    }
    
    .navbar-nav {
        padding: 0.5rem;
        flex-direction: column;
        width: 100%;
    }
    
    .navbar-nav.mx-auto,
    .navbar-nav.ms-auto {
        background: transparent;
        padding: 0.5rem;
        border-radius: 0;
        box-shadow: none;
        margin: 0 !important;
        flex-direction: column;
        align-items: stretch;
        width: 100%;
    }

    .navbar-nav .nav-item {
        width: 100%;
    }

    .navbar-nav .nav-link {
        font-size: 0.95rem;
        padding: 0.875rem 1rem !important;
        width: 100%;
        display: block;
        border-radius: 8px;
        min-height: 44px;
    }
    
    .navbar-nav .nav-link:hover {
        background: var(--color-light);
    }

    .navbar-nav .nav-link.active::after {
        display: none;
    }
    
    .navbar-nav .nav-link.active {
        background: rgba(26, 75, 132, 0.08);
    }

    .navbar-nav .btn {
        width: 100%;
        margin: 0.5rem 0 0 0 !important;
        justify-content: center;
        min-height: 44px;
    }
    
    /* Auth buttons container */
    .navbar-nav .guest-only,
    .navbar-nav .auth-only {
        margin-top: 0.5rem;
    }

    .navbar-nav .dropdown-toggle {
        display: flex;
        align-items: center;
        gap: 0.75rem;
        padding: 0.75rem 1rem !important;
    }
    
    .navbar-nav .dropdown-toggle img {
        margin: 0;
    }
    
    .navbar-nav .dropdown-menu {
        position: static !important;
        transform: none !important;
        box-shadow: none;
        border: 1px solid var(--color-gray-light);
        margin-top: 0.5rem;
        border-radius: 8px;
    }
    
    .navbar-nav .dropdown-item {
        padding: 0.75rem 1rem;
        min-height: 44px;
        display: flex;
        align-items: center;
    }
}

@media (max-width: 575px) {
    .navbar-brand span {
        font-size: 1.1rem;
    }

    .navbar-brand img {
        height: 36px;
        width: 36px;
    }
    
    .navbar .container {
        padding: 0 0.75rem;
    }
    
    .navbar-collapse {
        margin-top: 0.5rem;
        border-radius: 10px;
    }
    
    .navbar-nav .nav-link {
        font-size: 0.9rem;
        padding: 0.75rem 0.875rem !important;
    }
}

/* ===== Hero Section ===== */
.hero-section {
    position: relative;
    min-height: 100vh;
    padding-top: 100px;
    background-attachment: fixed;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    background-image: linear-gradient(rgba(26, 75, 132, 0.9), rgba(13, 45, 84, 0.95)), url('/img/law-background.jpg');
    overflow: hidden;
}

.hero-background {
    display: none;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    padding: 8px 20px;
    background: var(--color-light);
    border: 1px solid var(--color-gray-light);
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    color: var(--color-dark);
}

.hero-title {
    font-family: var(--font-display);
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    color: var(--color-dark);
}

.hero-subtitle {
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.6;
    font-weight: 400;
    max-width: 540px;
    margin-bottom: 2rem;
}

.hero-stats {
    display: flex;
    gap: 3rem;
    margin-top: 2rem;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-gray);
    margin-top: 0.5rem;
}

.hero-image-container {
    position: relative;
}

/* Removed animated orb */
.ai-orb {
    display: none;
}

.hero-image {
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
}

/* ===== Buttons ===== */
/* Simplified buttons - removed shine effects */
.btn {
    padding: 12px 28px;
    font-weight: 600;
    border-radius: 8px;
    transition: var(--transition);
    border: none;
}

.btn-sm {
    padding: 8px 20px;
    font-size: 0.875rem;
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-white);
}

.btn-primary:hover {
    background: var(--color-primary-dark);
    color: var(--color-white);
}

.btn-outline-primary {
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
    background: transparent;
}

.btn-outline-primary:hover {
    background: var(--color-primary);
    color: var(--color-white);
}

.btn-outline-light {
    border: 2px solid var(--color-white);
    color: var(--color-white);
    background: transparent;
}

.btn-outline-light:hover {
    background: var(--color-white);
    color: var(--color-dark);
}

/* ===== Feature Cards ===== */
/* Cleaner feature cards without gradient overlays */
.feature-card {
    padding: 2rem;
    background: var(--color-white);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    height: 100%;
    border: 1px solid var(--color-gray-light);
}

.feature-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary);
}

.feature-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    font-size: 1.75rem;
    color: var(--color-white);
    margin-bottom: 1.5rem;
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--color-dark);
}

.feature-description {
    color: var(--color-gray);
    line-height: 1.6;
    font-size: 0.9375rem;
}

/* ===== Why Choose Section ===== */
.why-choose-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.why-item {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.why-icon {
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-light);
    border-radius: 8px;
    color: var(--color-primary);
    font-size: 1.25rem;
}

.why-title {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--color-dark);
}

.why-description {
    color: var(--color-gray);
    margin: 0;
    font-size: 0.9375rem;
}

/* ===== Knowledge Cards ===== */
.knowledge-card {
    padding: 2rem;
    background: var(--color-white);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    height: 100%;
    text-align: center;
    border: 1px solid var(--color-gray-light);
}

.knowledge-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary);
}

.knowledge-icon {
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary);
    border-radius: 12px;
    font-size: 2rem;
    color: var(--color-white);
    margin: 0 auto 1.5rem;
}

.knowledge-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--color-dark);
}

.knowledge-description {
    color: var(--color-gray);
    line-height: 1.6;
    margin-bottom: 1.5rem;
    font-size: 0.9375rem;
}

.knowledge-stats .badge {
    padding: 6px 14px;
    font-size: 0.8125rem;
    font-weight: 600;
}

/* ===== Time Saving Section ===== */
/* Simplified gradient background */
.bg-gradient-primary {
    background: var(--color-primary);
}

.time-stat {
    text-align: center;
}

.time-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-white);
    line-height: 1;
}

.time-label {
    font-size: 0.9375rem;
    color: rgba(255, 255, 255, 0.9);
    margin-top: 0.5rem;
}

.comparison-card {
    background: var(--color-white);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow-lg);
}

.comparison-item {
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 1rem;
}

.comparison-item.traditional {
    background: #fef2f2;
    border: 1px solid #fecaca;
}

.comparison-item.modern {
    background: #f0fdf4;
    border: 1px solid #bbf7d0;
}

.comparison-item h4 {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-dark);
}

.comparison-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.comparison-list li {
    padding: 0.5rem 0;
    color: var(--color-dark);
    font-weight: 500;
    font-size: 0.9375rem;
}

.comparison-divider {
    text-align: center;
    padding: 0.5rem 0;
    font-size: 1.5rem;
    color: var(--color-primary);
}

/* ===== Video Section ===== */
.video-container {
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

/* ===== Quiz Section ===== */
.quiz-features {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.quiz-feature-item {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
    padding: 1.25rem;
    background: var(--color-white);
    border-radius: 8px;
    transition: var(--transition);
    border: 1px solid var(--color-gray-light);
}

.quiz-feature-item:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.quiz-feature-icon {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-light);
    border-radius: 8px;
    color: var(--color-primary);
    font-size: 1.25rem;
}

.quiz-feature-title {
    font-size: 1.0625rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
    color: var(--color-dark);
}

.quiz-feature-description {
    color: var(--color-gray);
    margin: 0;
    font-size: 0.9375rem;
}

.quiz-demo-card {
    background: var(--color-white);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    border: 1px solid var(--color-gray-light);
}

.quiz-demo-header {
    padding: 1.25rem;
    background: var(--color-light);
    border-bottom: 1px solid var(--color-gray-light);
    font-weight: 700;
    color: var(--color-dark);
}

.quiz-demo-body {
    padding: 1.5rem;
}

.quiz-question {
    margin-bottom: 1.5rem;
}

.quiz-number {
    display: inline-block;
    padding: 4px 10px;
    background: var(--color-primary);
    color: var(--color-white);
    border-radius: 4px;
    font-weight: 700;
    font-size: 0.8125rem;
    margin-bottom: 0.5rem;
}

.quiz-text {
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--color-dark);
    margin: 0.5rem 0 0 0;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.quiz-option {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.875rem;
    background: var(--color-light);
    border: 1px solid var(--color-gray-light);
    border-radius: 8px;
    transition: var(--transition);
    cursor: pointer;
}

.quiz-option:hover {
    border-color: var(--color-primary);
}

.quiz-option-correct {
    background: #f0fdf4;
    border-color: #22c55e;
}

.quiz-option label {
    flex: 1;
    cursor: pointer;
    margin: 0;
    font-weight: 500;
    font-size: 0.9375rem;
}

.quiz-explanation {
    padding: 1rem;
    background: #eff6ff;
    border-left: 3px solid #3b82f6;
    border-radius: 6px;
    color: var(--color-dark);
    font-size: 0.9375rem;
}

/* ===== Pricing Cards ===== */
.pricing-card {
    padding: 2rem;
    background: var(--color-white);
    border: 2px solid var(--color-gray-light);
    border-radius: 12px;
    transition: var(--transition);
    height: 100%;
    position: relative;
}

.pricing-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.pricing-card-popular {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    padding: 4px 16px;
    background: var(--color-primary);
    color: var(--color-white);
    border-radius: 20px;
    font-size: 0.8125rem;
    font-weight: 700;
    white-space: nowrap;
}

.pricing-header {
    text-align: center;
    margin-bottom: 2rem;
}

.pricing-name {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--color-dark);
}

.pricing-price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 0.25rem;
}

.price-currency {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-gray);
}

.price-amount {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-dark);
}

.price-period {
    font-size: 0.9375rem;
    color: var(--color-gray);
}

.pricing-features {
    list-style: none;
    padding: 0;
    margin: 0 0 2rem 0;
}

.pricing-features li {
    padding: 0.625rem 0;
    font-size: 0.9375rem;
}

/* ===== FAQ Section ===== */
.accordion-item {
    border: 1px solid var(--color-gray-light);
    margin-bottom: 0.75rem;
    border-radius: 8px;
    overflow: hidden;
}

.accordion-button {
    font-size: 1.0625rem;
    font-weight: 600;
    padding: 1rem 1.25rem;
    background: var(--color-white);
    color: var(--color-dark);
}

.accordion-button:not(.collapsed) {
    background: var(--color-light);
    color: var(--color-dark);
}

.accordion-button:focus {
    box-shadow: none;
}

.accordion-body {
    padding: 1.25rem;
    color: var(--color-gray);
    line-height: 1.6;
    font-size: 0.9375rem;
}

/* ===== Footer ===== */
.footer {
    background: var(--color-dark);
    color: rgba(255, 255, 255, 0.8);
    padding: 3rem 0 1.5rem;
}

.footer-brand {
    display: flex;
    align-items: center;
    color: var(--color-white);
    margin-bottom: 1rem;
}

.footer-description {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.6;
    margin-bottom: 1.5rem;
    font-size: 0.9375rem;
}

.social-links {
    display: flex;
    gap: 0.75rem;
}

.social-link {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 6px;
    color: var(--color-white);
    font-size: 1.125rem;
    transition: var(--transition);
}

.social-link:hover {
    background: var(--color-primary);
}

.footer-title {
    font-size: 1.0625rem;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 1rem;
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition);
    font-size: 0.9375rem;
}

.footer-links a:hover {
    color: var(--color-primary);
}

.footer-divider {
    border-color: rgba(255, 255, 255, 0.1);
    margin: 2rem 0 1.5rem;
}

.footer-bottom {
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.875rem;
}

/* ===== Animations ===== */
/* Simplified animations - less dramatic */
.fade-in,
.fade-in-delay,
.fade-in-delay-1,
.fade-in-delay-2,
.fade-in-delay-3 {
    opacity: 0;
    animation: fadeIn 0.6s ease forwards;
}

.fade-in-delay {
    animation-delay: 0.1s;
}
.fade-in-delay-1 {
    animation-delay: 0.1s;
}
.fade-in-delay-2 {
    animation-delay: 0.2s;
}
.fade-in-delay-3 {
    animation-delay: 0.3s;
}

@keyframes fadeIn {
    to {
        opacity: 1;
    }
}

/* ===== Responsive Design ===== */
@media (max-width: 991px) {
    .hero-title {
        font-size: 2.75rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .hero-stats {
        gap: 2rem;
    }
}

@media (max-width: 767px) {
    .hero-title {
        font-size: 2.25rem;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .hero-stats {
        flex-direction: column;
        gap: 1.5rem;
    }

    .stat-item {
        text-align: left;
    }

    .section-padding {
        padding: 60px 0;
    }
}

/* Removed custom scrollbar styling */

/* ===== Selection Styling ===== */
::selection {
    background: var(--color-primary);
    color: var(--color-white);
}
#home {
    background: url('/img/backgroundai.png') no-repeat right center/cover;
    position: relative;
    min-height: 100vh;
}
.hero-content-left {
    position: relative;
    z-index: 2; /* đảm bảo chữ nổi trên ảnh */
    max-width: 600px;
    padding-left: 40px; /* căn lề đẹp hơn */
    color: white; /* nếu ảnh tối thì giữ, nếu ảnh sáng thì bỏ */
}
.hero-title {
    color: #ffffff !important; /* Toàn bộ chữ trắng */
}
#mainNav {
    height: 60px; /* Hoặc 64px theo ý bạn */
    padding-top: 0 !important;
    padding-bottom: 0 !important;
}

#mainNav .navbar-brand img {
    height: 42px; /* Logo to nhưng vẫn nằm gọn trong navbar */
    width: auto;
    object-fit: contain;
}

/* Cải thiện giao diện tin nhắn */
.message {
    position: relative;
    max-width: 70%;
    padding: 10px 15px;
    border-radius: 15px;
    animation: fadeIn 0.3s ease-in-out;
}

.user-message {
    background-color: #007bff;
    color: white;
    margin-left: auto;
}

.ai-message {
    background-color: #f1f1f1;
    color: #333;
}

/* Hiển thị thời gian trong tin nhắn */
.message .small {
    display: block;
    text-align: right;
    font-size: 0.8rem;
    color: #888;
    margin-top: 5px;
}

/* Hiệu ứng động khi tin nhắn xuất hiện */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Cải thiện thanh nhập liệu */
#chat-input {
    border: 2px solid #ddd;
    border-radius: 25px;
    padding: 10px 15px;
    transition: border-color 0.3s;
}

#chat-input:focus {
    border-color: #007bff;
    outline: none;
}

/* Nút gửi tin nhắn */
button[type="submit"] {
    background-color: #007bff;
    border: none;
    color: white;
    transition: background-color 0.3s;
}

button[type="submit"]:hover {
    background-color: #0056b3;
}