@import url('https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:wght@400;500;700&display=swap');

:root {
    --primary-color: #007bff;
    --primary-hover: #0056b3;
    --gradient-start: #4f46e5;
    --gradient-end: #8b5cf6;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-dark: #0f172a;
    --text-light: #64748b;
    --border-color: #e2e8f0;
    --success-color: #10b981;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --border-radius: 12px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Be Vietnam Pro', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-dark);
    line-height: 1.6;
}

.container {
    background-color: var(--card-bg);
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    max-width: 900px;
    width: 100%;
    margin: 40px auto;
}

.step {
    display: none;
}
.step.active {
    display: block;
    animation: fadeIn 0.5s ease-in-out;
}

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

.page-header {
    text-align: center;
    margin-bottom: 3rem;
}
.page-header h1, .page-header h2 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
    font-weight: 700;
}
.page-header p {
    font-size: 1.1rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
}

/* Pricing Grid */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}
.pricing-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 2rem;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
}
.pricing-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}
.pricing-card.popular {
    border-color: var(--gradient-start);
    position: relative;
    border-width: 2px;
}
.popular-badge {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
    color: white;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 700;
}
.pricing-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}
.price {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-dark);
}
.currency {
    font-size: 1rem;
    font-weight: 400;
    color: var(--text-light);
}
.pricing-card ul {
    list-style: none;
    margin-bottom: 2rem;
    text-align: left;
    color: var(--text-light);
    flex-grow: 1;
}
.pricing-card ul li {
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.pricing-card ul li .fa-check-circle {
    color: var(--success-color);
}

/* Buttons */
.btn-select-plan, .btn-submit, .btn-cta {
    width: 100%;
    padding: 1rem;
    background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}
.btn-select-plan:hover, .btn-submit:hover, .btn-cta:hover {
    box-shadow: 0 4px 15px rgba(139, 92, 246, 0.4);
    transform: translateY(-2px);
}
.btn-submit:disabled {
    background: #ccc;
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}
.btn-back {
    padding: 1rem;
    background: transparent;
    color: var(--text-light);
    border: none;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: color 0.2s;
}
.btn-back:hover {
    color: var(--text-dark);
}

/* Form Container */
.form-container, .payment-container, .progress-container, .complete-container {
    max-width: 600px;
    margin: 0 auto;
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: var(--border-radius);
}
.form-container h2, .payment-container h2, .progress-container h2, .complete-container h2 {
    text-align: center;
    margin-bottom: 0.5rem;
}
.form-container p, .payment-container p, .complete-container p {
    text-align: center;
    color: var(--text-light);
    margin-bottom: 2rem;
}
.form-group {
    margin-bottom: 1.5rem;
}
.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}
.input-group {
    position: relative;
}
.input-group .fas {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-light);
}
.form-group input[type="text"], 
.form-group input[type="email"],
.form-group textarea {
    width: 100%;
    padding: 0.85rem 1rem 0.85rem 2.5rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: 'Be Vietnam Pro', sans-serif;
    transition: border-color 0.2s, box-shadow 0.2s;
}
.form-group textarea {
    resize: vertical;
    min-height: 100px;
}
.form-group input[type="text"]:focus, 
.form-group input[type="email"]:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--gradient-start);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
}

.form-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 2rem;
}

/* Payment Step */
.payment-details {
    display: flex;
    gap: 2rem;
    align-items: center;
    margin-bottom: 2rem;
    background-color: var(--bg-color);
    padding: 1.5rem;
    border-radius: var(--border-radius);
}
.qr-code img {
    max-width: 180px;
    border-radius: 8px;
}
.bank-info p {
    margin-bottom: 0.5rem;
    text-align: left;
}
#payment-amount {
    font-weight: 700;
    color: var(--gradient-start);
}
.checkbox-group {
    display: flex;
    align-items: center;
    justify-content: center;
}
.checkbox-group input {
    margin-right: 0.5rem;
}

/* Progress Step */
#progress-log {
    background-color: #0f172a;
    color: #e2e8f0;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    height: 250px;
    overflow-y: auto;
    margin-bottom: 1.5rem;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9rem;
}
#progress-log p {
    margin: 0;
    padding: 0;
    line-height: 1.5;
}
.spinner {
    border: 4px solid rgba(255, 255, 255, 0.1);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border-left-color: var(--gradient-start);
    animation: spin 1s ease infinite;
    margin: 0 auto;
}
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Complete Step */
.service-info {
    background: var(--bg-color);
    padding: 1.5rem;
    border-radius: 8px;
    margin: 2rem 0;
    text-align: left;
    border: 1px solid var(--border-color);
}
.service-info p {
    text-align: left;
    margin-bottom: 0.75rem;
}
#final-url {
    color: var(--gradient-start);
    font-weight: 700;
}

.security-note {
    background-color: #fffbe6;
    border: 1px solid #fde047;
    color: #a16207;
    padding: 1rem;
    border-radius: 8px;
    margin-top: -1rem;
    margin-bottom: 2rem;
    text-align: left;
    font-size: 0.9rem;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
}
.security-note .fas {
    font-size: 1.1rem;
    margin-top: 0.2rem;
}
.security-note p {
    margin: 0;
    text-align: left;
    color: #a16207;
}

/* Header */
.main-header {
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 15px 0;
}
.header-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}
.logo {
    font-size: 1.5em;
    font-weight: bold;
    color: var(--text-dark);
    text-decoration: none;
}
.main-nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: 25px;
}
.main-nav a {
    text-decoration: none;
    color: var(--text-light);
    font-weight: 500;
    transition: color 0.3s ease;
}
.main-nav a:hover {
    color: var(--gradient-start);
}

/* Hero Section */
.hero-section {
    background-image: url('https://khocangthongminh.com/wp-content/uploads/2022/08/Cong-nghe-AI.png');
    background-size: cover;
    background-position: center;
    color: white;
    padding: 100px 20px;
    text-align: center;
    position: relative;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero-content h1 {
    font-size: 3.5em;
    margin-bottom: 20px;
    line-height: 1.2;
    color: white;
}
.hero-content p {
    font-size: 1.2em;
    max-width: 700px;
    margin: 0 auto 30px;
    color: #e2e8f0;
}

/* Feature Section */
.features-section {
    background-color: var(--card-bg);
    padding: 60px 20px;
    text-align: center;
}
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 40px;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}
.feature-card {
    background: var(--bg-color);
    padding: 30px;
    border-radius: var(--border-radius);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-md);
}
.feature-card .fas {
    font-size: 2.5em;
    color: var(--gradient-start);
    margin-bottom: 20px;
    background: -webkit-linear-gradient(45deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.feature-card h3 {
    font-size: 1.5em;
    margin-bottom: 15px;
}

/* Contact Form Section */
.contact-form-section {
    padding: 60px 20px;
}

.contact-layout {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 3rem;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

.contact-layout .form-container {
    margin: 0;
    width: 100%;
    max-width: none;
    box-shadow: var(--shadow-lg);
}

.map-container {
    border-radius: var(--border-radius);
    overflow: hidden;
    height: 580px;
    box-shadow: var(--shadow-lg);
}

/* Footer */
.main-footer {
    background-color: #1e293b;
    color: #cbd5e1;
    padding: 50px 20px 20px;
    text-align: center;
}
.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
    gap: 30px;
    padding-bottom: 30px;
    border-bottom: 1px solid #334155;
}
.footer-col {
    flex-basis: 250px;
    text-align: left;
}
.footer-col h4 {
    font-size: 1.2em;
    margin-bottom: 20px;
    color: #ffffff;
}
.footer-col p, .footer-col a, .footer-col ul {
    color: #94a3b8;
    font-size: 0.9em;
    margin: 0 0 10px;
    text-decoration: none;
}
.footer-col a:hover {
    color: #ffffff;
}
.footer-col ul {
    list-style: none;
    padding: 0;
}
.social-icons a {
    color: #94a3b8;
    font-size: 1.5em;
    margin-right: 15px;
    transition: color 0.3s ease;
}
.social-icons a:hover {
    color: #ffffff;
}
.footer-bottom {
    margin-top: 20px;
    font-size: 0.8em;
    color: #64748b;
}

/* Focused Registration View */
body.registration-active {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 2rem;
}
body.registration-active .main-header,
body.registration-active .hero-section,
body.registration-active .features-section,
body.registration-active .main-footer,
body.registration-active .contact-form-section {
    display: none;
}
body.registration-active .container {
    margin: 0;
    width: 100%;
    max-width: 900px;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
    }
    .main-nav ul {
        margin-top: 15px;
    }
    .hero-content h1 {
        font-size: 2.5em;
    }
    .features-grid {
        grid-template-columns: 1fr;
    }
    .footer-container {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    .footer-col {
        text-align: center;
    }
    .payment-details {
        flex-direction: column;
    }
    body.registration-active .container {
        padding: 20px;
    }
    .contact-layout {
        grid-template-columns: 1fr;
    }
}