/* ============================
   CSS Variables & Base Styles
   ============================ */
:root {
    --color-bg-primary: #0f172a;
    --color-bg-secondary: #1e293b;
    --color-bg-tertiary: #334155;
    --color-border: rgba(71, 85, 105, 0.5);
    --color-text-primary: #ffffff;
    --color-text-secondary: #94a3b8;
    --color-text-muted: #64748b;
    --color-accent-start: #34d399;
    --color-accent-end: #22d3ee;
    --color-accent: #10b981;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --shadow-glow: 0 0 40px rgba(16, 185, 129, 0.15);
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background: linear-gradient(to bottom, var(--color-bg-primary), var(--color-bg-secondary), var(--color-bg-primary));
    color: var(--color-text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* ============================
   Container
   ============================ */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1rem;
}

.container-sm {
    max-width: 768px;
}

.container-md {
    max-width: 896px;
}

@media (min-width: 640px) {
    .container {
        padding: 0 1.5rem;
    }
}

@media (min-width: 1024px) {
    .container {
        padding: 0 2rem;
    }
}

/* ============================
   Navigation
   ============================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 50;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--color-accent-start), var(--color-accent-end));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-bg-primary);
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    background: linear-gradient(90deg, var(--color-accent-start), var(--color-accent-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: none;
    align-items: center;
    gap: 2rem;
}

@media (min-width: 768px) {
    .nav-menu {
        display: flex;
    }
}

.nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-text-primary);
}

.mobile-menu-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

@media (min-width: 768px) {
    .mobile-menu-btn {
        display: none;
    }
}

.menu-icon {
    position: relative;
    width: 24px;
    height: 2px;
    background: var(--color-text-primary);
    transition: var(--transition-fast);
}

.menu-icon::before,
.menu-icon::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background: var(--color-text-primary);
    transition: var(--transition-fast);
}

.menu-icon::before {
    top: -8px;
}

.menu-icon::after {
    top: 8px;
}

.mobile-menu-btn.active .menu-icon {
    background: transparent;
}

.mobile-menu-btn.active .menu-icon::before {
    top: 0;
    transform: rotate(45deg);
}

.mobile-menu-btn.active .menu-icon::after {
    top: 0;
    transform: rotate(-45deg);
}

.nav-menu.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-bg-secondary);
    padding: 1rem;
    border-bottom: 1px solid var(--color-border);
    gap: 1rem;
}

/* ============================
   Buttons
   ============================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
    font-family: var(--font-family);
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-accent-start), var(--color-accent-end));
    color: var(--color-bg-primary);
}

.btn-primary:hover {
    box-shadow: var(--shadow-glow);
    transform: translateY(-1px);
}

.btn-ghost {
    background: transparent;
    color: var(--color-text-secondary);
}

.btn-ghost:hover {
    color: var(--color-text-primary);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--color-border);
    color: var(--color-text-primary);
}

.btn-outline:hover {
    border-color: var(--color-text-muted);
    background: rgba(255, 255, 255, 0.05);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-lg);
}

.btn-block {
    width: 100%;
}

.btn-icon {
    width: 1.25rem;
    height: 1.25rem;
}

/* ============================
   Hero Section
   ============================ */
.hero {
    position: relative;
    padding: 8rem 0 5rem;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
}

.hero-glow {
    position: absolute;
    width: 384px;
    height: 384px;
    border-radius: 50%;
    filter: blur(80px);
    animation: pulse 4s ease-in-out infinite;
}

.hero-glow-1 {
    top: 25%;
    left: 25%;
    background: rgba(52, 211, 153, 0.2);
}

.hero-glow-2 {
    bottom: 25%;
    right: 25%;
    background: rgba(34, 211, 238, 0.2);
    animation-delay: 1s;
}

@keyframes pulse {
    0%, 100% {
        opacity: 0.5;
        transform: scale(1);
    }
    50% {
        opacity: 0.8;
        transform: scale(1.05);
    }
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(30, 41, 59, 0.5);
    border: 1px solid var(--color-border);
    border-radius: 9999px;
    padding: 0.5rem 1rem;
    margin-bottom: 2rem;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--color-accent-start);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1.5rem;
}

@media (min-width: 640px) {
    .hero-title {
        font-size: 3rem;
    }
}

@media (min-width: 1024px) {
    .hero-title {
        font-size: 3.75rem;
    }
}

.gradient-text {
    background: linear-gradient(90deg, var(--color-accent-start), var(--color-accent-end), var(--color-accent-start));
    background-size: 200% auto;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradient 3s linear infinite;
}

@keyframes gradient {
    0% {
        background-position: 0% center;
    }
    100% {
        background-position: 200% center;
    }
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    max-width: 640px;
    margin: 0 auto 2.5rem;
}

@media (min-width: 640px) {
    .hero-subtitle {
        font-size: 1.25rem;
    }
}

.hero-buttons {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    margin-bottom: 4rem;
}

@media (min-width: 640px) {
    .hero-buttons {
        flex-direction: row;
        justify-content: center;
    }
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    max-width: 896px;
    margin: 0 auto;
}

@media (min-width: 768px) {
    .stats-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.stat-card {
    background: rgba(30, 41, 59, 0.3);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: 1.5rem;
    text-align: center;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(90deg, var(--color-accent-start), var(--color-accent-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.25rem;
}

@media (min-width: 640px) {
    .stat-value {
        font-size: 1.875rem;
    }
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

/* ============================
   Section Styles
   ============================ */
.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: 1.875rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

@media (min-width: 640px) {
    .section-title {
        font-size: 2.25rem;
    }
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    max-width: 640px;
    margin: 0 auto;
}

/* ============================
   Features Section
   ============================ */
.features {
    padding: 5rem 0;
    background: rgba(30, 41, 59, 0.3);
}

.features-grid {
    display: grid;
    gap: 1.5rem;
}

@media (min-width: 768px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.feature-card {
    background: rgba(30, 41, 59, 0.5);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: 1.5rem;
    transition: all var(--transition-normal);
}

.feature-card:hover {
    border-color: rgba(52, 211, 153, 0.5);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg), 0 0 40px rgba(16, 185, 129, 0.05);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.feature-text {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
}

/* ============================
   How It Works Section
   ============================ */
.how-it-works {
    padding: 5rem 0;
}

.steps-grid {
    display: grid;
    gap: 1.5rem;
}

@media (min-width: 768px) {
    .steps-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .steps-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.step-card {
    background: rgba(30, 41, 59, 0.5);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: 1.5rem;
    height: 100%;
}

.step-number {
    font-size: 3rem;
    font-weight: 700;
    background: linear-gradient(90deg, rgba(52, 211, 153, 0.3), rgba(34, 211, 238, 0.3));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
}

.step-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.step-text {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
}

/* ============================
   Pricing Section
   ============================ */
.pricing {
    padding: 5rem 0;
    background: rgba(30, 41, 59, 0.3);
}

.pricing-grid {
    display: grid;
    gap: 1.5rem;
    max-width: 1024px;
    margin: 0 auto;
}

@media (min-width: 768px) {
    .pricing-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.pricing-card {
    position: relative;
    background: rgba(30, 41, 59, 0.5);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: 1.5rem;
}

.pricing-card-popular {
    background: linear-gradient(to bottom, rgba(52, 211, 153, 0.1), rgba(34, 211, 238, 0.1));
    border: 2px solid rgba(52, 211, 153, 0.5);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(90deg, var(--color-accent-start), var(--color-accent-end));
    color: var(--color-bg-primary);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.25rem 1rem;
    border-radius: 9999px;
}

.pricing-header {
    text-align: center;
    margin-bottom: 1.5rem;
}

.pricing-name {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.pricing-price {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.price-currency {
    font-size: 1rem;
    color: var(--color-text-secondary);
}

.price-value-sm {
    font-size: 1.5rem;
}

.pricing-info {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.pricing-features {
    list-style: none;
    margin-bottom: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.pricing-feature {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

.check-icon {
    width: 1.25rem;
    height: 1.25rem;
    color: var(--color-accent-start);
    flex-shrink: 0;
}

/* ============================
   FAQ Section
   ============================ */
.faq {
    padding: 5rem 0;
}

.faq-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.faq-item {
    background: rgba(30, 41, 59, 0.5);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem 1.5rem;
    background: none;
    border: none;
    color: var(--color-text-primary);
    font-size: 1rem;
    font-weight: 500;
    text-align: left;
    cursor: pointer;
    transition: background var(--transition-fast);
    font-family: var(--font-family);
}

.faq-question:hover {
    background: rgba(255, 255, 255, 0.03);
}

.faq-icon {
    width: 1.25rem;
    height: 1.25rem;
    color: var(--color-text-secondary);
    flex-shrink: 0;
    transition: transform var(--transition-fast);
}

.faq-item.active .faq-icon {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal);
}

.faq-item.active .faq-answer {
    max-height: 200px;
}

.faq-answer p {
    padding: 0 1.5rem 1rem;
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
}

/* ============================
   Registration Section
   ============================ */
.registration {
    padding: 5rem 0;
    background: rgba(30, 41, 59, 0.3);
}

.registration-wrapper {
    display: grid;
    gap: 3rem;
    align-items: center;
}

@media (min-width: 1024px) {
    .registration-wrapper {
        grid-template-columns: 1fr 1fr;
        gap: 4rem;
    }
}

.registration-badge {
    display: inline-block;
    background: linear-gradient(90deg, rgba(52, 211, 153, 0.2), rgba(34, 211, 238, 0.2));
    border: 1px solid rgba(52, 211, 153, 0.3);
    color: var(--color-accent-start);
    font-size: 0.875rem;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 9999px;
    margin-bottom: 1.5rem;
}

.registration-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.3;
}

@media (min-width: 640px) {
    .registration-title {
        font-size: 2.5rem;
    }
}

.registration-text {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    margin-bottom: 2rem;
}

.registration-benefits {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.benefit-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--color-text-secondary);
}

.benefit-icon {
    width: 1.5rem;
    height: 1.5rem;
    color: var(--color-accent-start);
    flex-shrink: 0;
}

/* Form Styles */
.registration-form-wrapper {
    background: rgba(30, 41, 59, 0.5);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: 2rem;
}

@media (min-width: 640px) {
    .registration-form-wrapper {
        padding: 2.5rem;
    }
}

.form-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    text-align: center;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-row {
    display: grid;
    gap: 1rem;
}

@media (min-width: 640px) {
    .form-row {
        grid-template-columns: 1fr 1fr;
    }
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--color-text-primary);
}

.required {
    color: #ef4444;
}

.form-input {
    width: 100%;
    padding: 0.875rem 1rem;
    font-size: 1rem;
    font-family: var(--font-family);
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    transition: all var(--transition-fast);
}

.form-input::placeholder {
    color: var(--color-text-muted);
}

.form-input:focus {
    outline: none;
    border-color: var(--color-accent-start);
    box-shadow: 0 0 0 3px rgba(52, 211, 153, 0.1);
}

.form-textarea {
    resize: vertical;
    min-height: 100px;
}

.form-notice {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-align: center;
    margin-top: 1rem;
}

/* ============================
   Footer
   ============================ */
.footer {
    padding: 3rem 0;
    background: rgba(15, 23, 42, 0.5);
    border-top: 1px solid var(--color-border);
}

.footer-grid {
    display: grid;
    gap: 2rem;
    margin-bottom: 2rem;
}

@media (min-width: 768px) {
    .footer-grid {
        grid-template-columns: 2fr 1fr 1fr 1fr;
    }
}

.footer-brand .logo {
    margin-bottom: 1rem;
}

.footer-tagline {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: 1rem;
}

.footer-legal {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    line-height: 1.7;
}

.footer-legal p {
    margin-bottom: 0.25rem;
}

.footer-legal strong {
    color: var(--color-text-secondary);
}

.footer-title {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.footer-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.footer-list a {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
}

@media (min-width: 768px) {
    .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
    }
}

.footer-copyright {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.footer-social {
    display: flex;
    gap: 1rem;
}

.social-link {
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

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

.social-link svg {
    width: 1.25rem;
    height: 1.25rem;
}

/* ============================
   Modal
   ============================ */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    padding: 1rem;
}

.modal {
    position: relative;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: 2.5rem;
    max-width: 400px;
    width: 100%;
    text-align: center;
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.05);
    border: none;
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-text-primary);
}

.modal-close svg {
    width: 1.25rem;
    height: 1.25rem;
}

.modal-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--color-accent-start), var(--color-accent-end));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--color-bg-primary);
    margin: 0 auto 1.5rem;
}

.modal-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.modal-text {
    font-size: 1rem;
    color: var(--color-text-secondary);
    margin-bottom: 1.5rem;
}

.form-notice-link {
    color: var(--color-accent-start);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.form-notice-link:hover {
    color: var(--color-accent-end);
}