:root {
    --primary-color: #ffc107;
    --dark-bg: #1a1a1a;
    --light-bg: #f8f9fa;
}

body {
    font-family: 'Arial', sans-serif;
    padding-top: 65px;
}

p {
    font-size: 1.2rem;
}

/* Navigation */
.navbar {
    background-color: var(--dark-bg) !important;
}

.navbar-brand {
    font-size: 1.5rem;
    color: var(--primary-color) !important;
}

/* Hero Section */
.hero-section {
    background-image: url('background.jpg');
    background-size: cover;
    background-repeat: none;
    color: white;
    padding: 80px 0;
}

.overlay {
    background: rgba(38, 38, 38, 0.2);
    border-radius: 12px; 
}

.countdown-container {
    margin: 40px 0;
}

.countdown-box {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 30px;
    margin: 0 10px;
    min-width: 100px;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.countdown-number {
    font-size: 3rem;
    font-weight: bold;
    color: var(--primary-color);
}

.countdown-label {
    font-size: 1rem;
    color: white;
    margin-top: 10px;
}

/* Video Placeholder */
.video-placeholder {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 15px;
    overflow: hidden;
    margin-bottom: 20px;
}

.video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.video-overlay:hover {
    background: rgba(0, 0, 0, 0.5);
}

.video-overlay i {
    color: white;
    opacity: 0.9;
    transition: all 0.3s ease;
}

.video-overlay:hover i {
    transform: scale(1.1);
    opacity: 1;
}

/* Feature List */
.feature-list {
    list-style: none;
    padding: 0;
    font-size: 1.25rem;
}

.feature-list li {
    padding: 10px 0;
    font-size: 1.4rem;
    color: #333;
}

/* Theme Section */
.theme-section {
    background-color: var(--light-bg);
}

/* Features Section */
.features-section {
    background: white;
}

.feature-card {
    background: white;
    border: 2px solid #e0e0e0;
    border-radius: 15px;
    padding: 40px 20px;
    transition: all 0.3s ease;
    height: 100%;
}

.feature-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.feature-card i {
    color: var(--primary-color);
}

/* Pricing Section */
.pricing-section {
    background: var(--light-bg);
}

.pricing-card {
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

.pricing-option {
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 15px;
    transition: all 0.3s ease;
    cursor: pointer;
    display: block;
}

.pricing-option:hover {
    border-color: var(--primary-color);
    background-color: #fffbf0;
}

.pricing-option input:checked + label {
    color: var(--primary-color);
    font-weight: bold;
}

.pricing-option input:checked ~ .pricing-option {
    border-color: var(--primary-color);
    background-color: #fffbf0;
}

.discount-banner {
    background: linear-gradient(135deg, #ff6b6b 0%, #ee5a52 100%);
    color: white;
    border-radius: 15px;
    padding: 30px;
    text-align: center;
}

.discount-amount {
    font-size: 3rem;
    font-weight: bold;
}

.discount-badge {
    font-size: 1.2rem;
    background: rgba(255, 255, 255, 0.3);
    padding: 5px 15px;
    border-radius: 20px;
    display: inline-block;
    margin: 10px 0;
}

.original-price {
    font-size: 1.1rem;
    opacity: 0.9;
}

.order-summary {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 10px;
}

/* Stats Section */
.stats-section {
    margin-top: 40px;
}

.stat-item {
    padding: 30px;
    background: white;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.stat-item:hover {
    transform: translateY(-5px);
}

.stat-number {
    font-size: 3rem;
    font-weight: bold;
    color: var(--primary-color);
}

/* Buttons */
.btn-warning {
    background-color: var(--primary-color);
    border: none;
    font-weight: bold;
    padding: 15px 40px;
    transition: all 0.3s ease;
}

.btn-warning:hover {
    background-color: #ffb300;
    transform: scale(1.05);
}

/* Highlight Box */
.highlight-box {
    background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%);
    border-radius: 10px;
    padding: 20px;
    border-left: 4px solid var(--primary-color);
}

/* Goal Cards */
.goal-card {
    background: white;
    border: 2px solid #e0e0e0;
    border-radius: 15px;
    padding: 40px 20px;
    transition: all 0.3s ease;
    height: 100%;
}

.goal-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.goal-card i {
    color: var(--primary-color);
}

/* Important Section */
.important-section {
    background-color: var(--light-bg);
}

.important-card {
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

/* How It Works Section */
.how-it-works {
    background: white;
}

.how-card {
    background: white;
    border: 2px solid #e0e0e0;
    border-radius: 15px;
    padding: 40px 20px;
    transition: all 0.3s ease;
    height: 100%;
}

.how-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

/* Warning Section */
.warning-section {
    background-color: #fff3cd;
}

.warning-card {
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    border: 2px solid #ffc107;
}

/* Footer */
footer {
    background-color: var(--dark-bg) !important;
}

footer i {
    color: var(--primary-color);
    margin-right: 10px;
}

/* Responsive */
@media (max-width: 768px) {
    .hero-section {
        padding: 40px 0;
    }

    .countdown-box {
        margin: 5px;
        padding: 20px;
        min-width: 80px;
    }

    .countdown-number {
        font-size: 2rem;
    }

    .pricing-card {
        padding: 20px;
    }

    .display-3 {
        font-size: 2.2rem;
    }

    .display-4 {
        font-size: 2rem;
    }
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* Section Spacing */
section {
    padding: 80px 0;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: #ffb300;
}

.process-step { background: white; border-radius: 12px; box-shadow: 0 4px 12px rgba(0,0,0,0.05); padding: 1.5rem; margin-bottom: 1rem; }
.step-number {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(90deg, #4f46e5, #06b6d4);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  flex-shrink: 0; /* ngăn co lại */
  line-height: 1; /* đảm bảo không bị kéo dài */
  font-size: 16px; /* tùy chỉnh theo ý muốn */
}