/* ========================================
   COMPONENTS
   ======================================== */

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}

.btn--primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-glow);
}

.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 40px rgba(79, 70, 229, 0.5);
}

.btn--accent {
    background: var(--gradient-accent);
    color: white;
    box-shadow: var(--shadow-glow-accent);
}

.btn--accent:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 40px rgba(245, 158, 11, 0.5);
}

.btn--outline {
    background: transparent;
    color: var(--color-text);
    border: 1px solid var(--color-border);
    backdrop-filter: var(--glass-blur);
}

.btn--outline:hover {
    border-color: var(--color-primary-light);
    background: rgba(79, 70, 229, 0.1);
}

.btn--lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--font-size-lg);
    border-radius: var(--radius-lg);
}

.btn--sm {
    padding: var(--space-2) var(--space-4);
    font-size: var(--font-size-sm);
}

.btn--full {
    width: 100%;
}

/* Pulse Animation for CTA */
.btn--pulse {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(79, 70, 229, 0.4);
    }

    70% {
        box-shadow: 0 0 0 15px rgba(79, 70, 229, 0);
    }

    100% {
        box-shadow: 0 0 0 0 rgba(79, 70, 229, 0);
    }
}

/* Pulse Animation for Accent CTA */
@keyframes pulseAccent {
    0% {
        box-shadow: 0 0 0 0 rgba(245, 158, 11, 0.4);
    }

    70% {
        box-shadow: 0 0 0 15px rgba(245, 158, 11, 0);
    }

    100% {
        box-shadow: 0 0 0 0 rgba(245, 158, 11, 0);
    }
}

.btn--accent.btn--pulse {
    animation: pulseAccent 2s infinite;
}

/* --- Glass Card --- */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    transition: all var(--transition-base);
}

.glass-card:hover {
    border-color: rgba(79, 70, 229, 0.3);
    box-shadow: var(--shadow-lg);
}

.glass-card--sm {
    padding: var(--space-6);
}

.glass-card--highlight {
    border-color: var(--color-primary);
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.15), rgba(124, 58, 237, 0.08));
}

/* --- Badge --- */
.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-1) var(--space-3);
    background: rgba(79, 70, 229, 0.15);
    color: var(--color-primary-light);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.badge--accent {
    background: rgba(245, 158, 11, 0.15);
    color: var(--color-accent);
}

.badge--success {
    background: rgba(16, 185, 129, 0.15);
    color: var(--color-success);
}

/* --- Stat Card --- */
.stat {
    text-align: center;
    padding: var(--space-6);
}

.stat__number {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-extrabold);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: var(--space-2);
}

.stat__label {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

/* --- Accordion --- */
.accordion {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.accordion__item {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: border-color var(--transition-base);
}

.accordion__item[open] {
    border-color: rgba(79, 70, 229, 0.3);
}

.accordion__trigger {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: var(--space-5) var(--space-6);
    background: none;
    border: none;
    color: var(--color-text);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    text-align: left;
    list-style: none;
}

.accordion__trigger::-webkit-details-marker {
    display: none;
}

.accordion__trigger::after {
    content: '';
    width: 24px;
    height: 24px;
    flex-shrink: 0;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%2394A3B8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-size: contain;
    transition: transform var(--transition-base);
}

.accordion__item[open] .accordion__trigger::after {
    transform: rotate(180deg);
}

.accordion__content {
    padding: 0 var(--space-6) var(--space-6);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
}

.accordion__content ul {
    padding-left: var(--space-5);
    list-style: none;
}

.accordion__content li {
    padding: var(--space-2) 0;
    position: relative;
    padding-left: var(--space-6);
}

.accordion__content li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-success);
    font-weight: bold;
}

/* --- Tabs --- */
.tabs {
    width: 100%;
}

.tabs__list {
    display: flex;
    gap: var(--space-2);
    margin-bottom: var(--space-8);
    overflow-x: auto;
    scrollbar-width: none;
    padding-bottom: var(--space-2);
    border-bottom: 1px solid var(--color-border);
}

.tabs__list::-webkit-scrollbar {
    display: none;
}

.tabs__btn {
    padding: var(--space-3) var(--space-5);
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
}

.tabs__btn:hover {
    color: var(--color-text);
}

.tabs__btn--active {
    color: var(--color-primary-light);
    border-bottom-color: var(--color-primary);
}

.tabs__panel {
    display: none;
}

.tabs__panel--active {
    display: block;
    animation: fadeIn 0.3s ease;
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --- Pricing Card --- */
.pricing-card {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-2xl);
    padding: var(--space-8);
    display: flex;
    flex-direction: column;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

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

.pricing-card--featured {
    border-color: var(--color-primary);
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.12), rgba(124, 58, 237, 0.06));
}

.pricing-card--featured::before {
    content: '🔥 Phổ biến nhất';
    position: absolute;
    top: 0;
    right: 0;
    padding: var(--space-2) var(--space-5);
    background: var(--gradient-primary);
    color: white;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    border-radius: 0 var(--radius-2xl) 0 var(--radius-lg);
}

.pricing-card__name {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-2);
}

.pricing-card__desc {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-6);
}

.pricing-card__price {
    margin-bottom: var(--space-6);
}

.pricing-card__amount {
    font-size: var(--font-size-5xl);
    font-weight: var(--font-weight-extrabold);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.pricing-card__original {
    font-size: var(--font-size-lg);
    color: var(--color-text-dim);
    text-decoration: line-through;
    margin-top: var(--space-1);
}

.pricing-card__period {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.pricing-card__features {
    flex: 1;
    margin-bottom: var(--space-6);
}

.pricing-card__feature {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    padding: var(--space-3) 0;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.pricing-card__feature::before {
    content: '✓';
    color: var(--color-success);
    font-weight: bold;
    flex-shrink: 0;
}

.pricing-card__feature--disabled {
    color: var(--color-text-dim);
}

.pricing-card__feature--disabled::before {
    content: '✕';
    color: var(--color-text-dim);
}

/* --- Testimonial Card --- */
.testimonial-card {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
}

.testimonial-card__quote {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--space-6);
    font-style: italic;
    position: relative;
    padding-left: var(--space-6);
}

.testimonial-card__quote::before {
    content: '"';
    position: absolute;
    left: 0;
    top: -8px;
    font-size: 3rem;
    color: var(--color-primary);
    font-style: normal;
    line-height: 1;
}

.testimonial-card__author {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.testimonial-card__avatar {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-lg);
    color: white;
    flex-shrink: 0;
}

.testimonial-card__name {
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-sm);
}

.testimonial-card__role {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

/* --- Instructor Card --- */
.instructor-card {
    text-align: center;
    padding: var(--space-8);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
}

.instructor-card:hover {
    border-color: rgba(79, 70, 229, 0.3);
    transform: translateY(-4px);
}

.instructor-card__photo {
    width: 140px;
    height: 140px;
    border-radius: var(--radius-full);
    margin: 0 auto var(--space-6);
    overflow: hidden;
    border: 3px solid rgba(79, 70, 229, 0.4);
    box-shadow: 0 0 30px rgba(79, 70, 229, 0.2);
}

.instructor-card__photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.instructor-card__name {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-2);
}

.instructor-card__title {
    font-size: var(--font-size-sm);
    color: var(--color-primary-light);
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--space-4);
}

.instructor-card__bio {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    line-height: var(--line-height-relaxed);
    text-align: left;
}

.instructor-card__bio li {
    padding: var(--space-1) 0;
    padding-left: var(--space-5);
    position: relative;
}

.instructor-card__bio li::before {
    content: '•';
    position: absolute;
    left: var(--space-2);
    color: var(--color-primary-light);
}

/* --- Countdown Timer --- */
.countdown {
    display: flex;
    gap: var(--space-4);
    justify-content: center;
}

.countdown__item {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 70px;
}

.countdown__number {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-extrabold);
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.countdown__label {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-top: var(--space-1);
}

/* --- Floating CTA --- */
.floating-cta {
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    z-index: var(--z-floating);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    align-items: flex-end;
}

.floating-cta__btn {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-base);
    border: none;
    cursor: pointer;
}

.floating-cta__btn--zalo {
    background: #0068FF;
    color: white;
}

.floating-cta__btn--zalo:hover {
    transform: scale(1.1);
    box-shadow: 0 0 30px rgba(0, 104, 255, 0.5);
}

.floating-cta__btn--top {
    background: var(--color-surface);
    color: var(--color-text-muted);
    border: 1px solid var(--color-border);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition-base);
}

.floating-cta__btn--top.is-visible {
    opacity: 1;
    pointer-events: auto;
}

.floating-cta__btn--top:hover {
    background: var(--color-surface-light);
    color: var(--color-text);
}

/* --- Feature List --- */
.feature-list {
    display: grid;
    gap: var(--space-6);
}

.feature-item {
    display: flex;
    gap: var(--space-4);
    align-items: flex-start;
}

.feature-item__icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-lg);
    background: var(--gradient-card);
    border: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.feature-item__content h4 {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-1);
}

.feature-item__content p {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    line-height: var(--line-height-relaxed);
}

/* --- Comparison Table --- */
.compare-table {
    width: 100%;
    border-radius: var(--radius-xl);
    overflow: hidden;
    border: 1px solid var(--glass-border);
}

.compare-table th,
.compare-table td {
    padding: var(--space-4) var(--space-5);
    text-align: left;
    border-bottom: 1px solid var(--color-border-light);
}

.compare-table thead th {
    background: var(--color-surface);
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.compare-table tbody td {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    background: var(--glass-bg);
}

.compare-table tbody tr:last-child td {
    border-bottom: none;
}

.compare-table .highlight-col {
    background: rgba(79, 70, 229, 0.08) !important;
}