/* ===========================
   CSS Variables & Design System
   =========================== */
:root {
    /* Colors */
    --color-primary: hsl(220, 90%, 56%);
    --color-primary-dark: hsl(220, 90%, 46%);
    --color-primary-light: hsl(220, 90%, 66%);
    --color-secondary: hsl(45, 100%, 51%);
    --color-accent: hsl(280, 70%, 60%);

    --color-bg-primary: hsl(220, 25%, 10%);
    --color-bg-secondary: hsl(220, 20%, 14%);
    --color-bg-tertiary: hsl(220, 18%, 18%);

    --color-text-primary: hsl(0, 0%, 98%);
    --color-text-secondary: hsl(220, 10%, 70%);
    --color-text-muted: hsl(220, 10%, 50%);

    --color-success: hsl(142, 76%, 56%);
    --color-error: hsl(0, 84%, 60%);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    --gradient-secondary: linear-gradient(135deg, var(--color-secondary) 0%, hsl(35, 100%, 51%) 100%);
    --gradient-overlay: linear-gradient(135deg, rgba(37, 99, 235, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

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

    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3.5rem;

    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    --radius-xl: 2rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 16px 64px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 40px rgba(59, 130, 246, 0.5);

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;

    /* Z-index */
    --z-navbar: 1000;
    --z-modal: 2000;
}

/* ===========================
   Reset & Base Styles
   =========================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    overflow-x: hidden;
}

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

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

ul {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    outline: none;
}

input,
select,
textarea {
    font-family: inherit;
    outline: none;
}

/* ===========================
   Container & Layout
   =========================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ===========================
   Navigation
   =========================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: var(--spacing-md) 0;
    background: transparent;
    transition: var(--transition-base);
    z-index: var(--z-navbar);
}

.navbar.scrolled {
    background: rgba(17, 24, 39, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: var(--shadow-md);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo img {
    width: 50px;
    height: 50px;
    object-fit: contain;
}

.logo-text {
    font-size: var(--font-size-lg);
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-cta {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-sm);
}

/* ===========================
   Buttons
   =========================== */
.cta-button {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-base);
    font-weight: 600;
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

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

.cta-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-accent) 100%);
    opacity: 0;
    transition: var(--transition-base);
}

.cta-primary:hover::before {
    opacity: 1;
}

.cta-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.cta-button span,
.cta-button svg {
    position: relative;
    z-index: 1;
}

.cta-icon {
    transition: var(--transition-base);
}

.cta-button:hover .cta-icon {
    transform: translateX(4px);
}

/* ===========================
   Hero Section
   =========================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding-top: 80px;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('hero.png') center/cover no-repeat;
    z-index: -2;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg,
            rgba(17, 24, 39, 0.95) 0%,
            rgba(30, 41, 59, 0.9) 50%,
            rgba(17, 24, 39, 0.95) 100%);
    z-index: -1;
}

.hero-overlay::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-overlay);
    animation: gradient-shift 15s ease infinite;
}

@keyframes gradient-shift {

    0%,
    100% {
        opacity: 0.3;
    }

    50% {
        opacity: 0.6;
    }
}

.hero-content {
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
    animation: fade-in-up 1s ease;
}

@keyframes fade-in-up {
    from {
        opacity: 0;
        transform: translateY(40px);
    }

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

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.3);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-primary-light);
    margin-bottom: var(--spacing-lg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

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

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
        transform: scale(1);
    }

    50% {
        opacity: 0.5;
        transform: scale(1.2);
    }
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(var(--font-size-3xl), 6vw, var(--font-size-5xl));
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.02em;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
    animation: gradient-flow 3s ease infinite;
    background-size: 200% 200%;
}

@keyframes gradient-flow {

    0%,
    100% {
        background-position: 0% 50%;
    }

    50% {
        background-position: 100% 50%;
    }
}

.hero-description {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 700px;
    margin: 0 auto var(--spacing-xl);
    line-height: 1.8;
}

.hero-cta {
    margin-bottom: var(--spacing-3xl);
}

.hero-stats {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
}

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

.stat-number {
    font-size: var(--font-size-3xl);
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-divider {
    width: 1px;
    height: 50px;
    background: linear-gradient(to bottom, transparent, var(--color-primary), transparent);
}

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {

    0%,
    100% {
        transform: translateX(-50%) translateY(0);
    }

    50% {
        transform: translateX(-50%) translateY(10px);
    }
}

.mouse {
    width: 30px;
    height: 50px;
    border: 2px solid var(--color-primary);
    border-radius: 20px;
    position: relative;
}

.mouse::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--color-primary);
    border-radius: 2px;
    animation: mouse-scroll 1.5s ease-in-out infinite;
}

@keyframes mouse-scroll {
    0% {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }

    100% {
        opacity: 0;
        transform: translateX(-50%) translateY(15px);
    }
}

/* ===========================
   Section Styles
   =========================== */
.section-label {
    display: inline-block;
    font-size: var(--font-size-sm);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(var(--font-size-2xl), 4vw, var(--font-size-4xl));
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--spacing-3xl);
}

/* ===========================
   Features Section
   =========================== */
.features {
    padding: var(--spacing-3xl) 0;
    background: var(--color-bg-primary);
    position: relative;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.feature-card {
    padding: var(--spacing-xl);
    background: var(--color-bg-secondary);
    border: 1px solid rgba(59, 130, 246, 0.1);
    border-radius: var(--radius-lg);
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-overlay);
    opacity: 0;
    transition: var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-8px);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-xl);
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-card>* {
    position: relative;
    z-index: 1;
}

.feature-icon {
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    color: white;
}

.feature-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.feature-description {
    color: var(--color-text-secondary);
    line-height: 1.8;
}

.feature-card[data-aos="fade-up"] {
    animation: fade-in-up 0.8s ease forwards;
    opacity: 0;
}

.feature-card[data-delay="0"] {
    animation-delay: 0s;
}

.feature-card[data-delay="100"] {
    animation-delay: 0.1s;
}

.feature-card[data-delay="200"] {
    animation-delay: 0.2s;
}

/* ===========================
   Benefits Section
   =========================== */
.benefits {
    padding: var(--spacing-3xl) 0;
    background: var(--color-bg-secondary);
}

.benefits-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-3xl);
    align-items: center;
}

.benefits-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.benefit-item {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.benefit-check {
    width: 40px;
    height: 40px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: 50%;
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: white;
}

.benefit-text h4 {
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.benefit-text p {
    color: var(--color-text-secondary);
}

.benefits-visual {
    position: relative;
    height: 500px;
    display: none;
}

@media (min-width: 768px) {
    .benefits-visual {
        display: block;
    }
}

.visual-card {
    position: absolute;
    width: 280px;
    height: 180px;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, var(--color-bg-tertiary), var(--color-bg-primary));
    border: 1px solid rgba(59, 130, 246, 0.2);
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.card-1 {
    top: 0;
    left: 0;
    animation: float 6s ease-in-out infinite;
    background: var(--gradient-primary);
    opacity: 0.9;
}

.card-2 {
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation: float 6s ease-in-out infinite 2s;
    background: var(--gradient-secondary);
    opacity: 0.8;
}

.card-3 {
    bottom: 0;
    right: 0;
    animation: float 6s ease-in-out infinite 4s;
    background: linear-gradient(135deg, var(--color-accent), var(--color-primary));
    opacity: 0.7;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0) rotate(0deg);
    }

    25% {
        transform: translateY(-20px) rotate(2deg);
    }

    50% {
        transform: translateY(-10px) rotate(-2deg);
    }

    75% {
        transform: translateY(-20px) rotate(1deg);
    }
}

/* ===========================
   Pre-Register Section
   =========================== */
.pre-register {
    padding: var(--spacing-3xl) 0;
    background: var(--color-bg-primary);
}

.form-wrapper {
    max-width: 600px;
    margin: 0 auto;
    padding: var(--spacing-2xl);
    background: var(--color-bg-secondary);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
}

.form-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.form-subtitle {
    color: var(--color-text-secondary);
    margin-top: var(--spacing-sm);
}

.register-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-group label {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
}

.form-group input,
.form-group select {
    padding: var(--spacing-md);
    background: var(--color-bg-tertiary);
    border: 2px solid transparent;
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
    font-size: var(--font-size-base);
    transition: var(--transition-base);
}

.form-group input:focus,
.form-group select:focus {
    border-color: var(--color-primary);
    background: var(--color-bg-primary);
}

.checkbox-group {
    flex-direction: row;
    align-items: center;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    user-select: none;
}

.checkbox-label input[type="checkbox"] {
    display: none;
}

.checkbox-custom {
    width: 24px;
    height: 24px;
    border: 2px solid var(--color-primary);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-base);
    flex-shrink: 0;
}

.checkbox-label input[type="checkbox"]:checked+.checkbox-custom {
    background: var(--gradient-primary);
}

.checkbox-label input[type="checkbox"]:checked+.checkbox-custom::after {
    content: '✓';
    color: white;
    font-weight: 700;
}

.checkbox-text {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.form-submit {
    width: 100%;
    margin-top: var(--spacing-md);
    justify-content: center;
}

.success-message {
    display: none;
    text-align: center;
    padding: var(--spacing-xl);
    animation: fade-in-up 0.5s ease;
}

.success-message.active {
    display: block;
}

.success-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-lg);
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: white;
    animation: scale-in 0.5s ease;
}

@keyframes scale-in {
    from {
        transform: scale(0);
    }

    to {
        transform: scale(1);
    }
}

.success-message h3 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-sm);
}

.success-message p {
    color: var(--color-text-secondary);
}

/* ===========================
   Footer
   =========================== */
.footer {
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    background: var(--color-bg-secondary);
    border-top: 1px solid rgba(59, 130, 246, 0.1);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-xl);
}

.footer-logo {
    width: 50px;
    height: 50px;
    margin-bottom: var(--spacing-sm);
}

.footer-description {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

.footer-links {
    display: flex;
    gap: var(--spacing-2xl);
    justify-content: flex-end;
}

.footer-column h4 {
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.footer-column ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-column a {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-bottom p {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

/* ===========================
   Responsive Design
   =========================== */
@media (max-width: 768px) {
    .hero-stats {
        gap: var(--spacing-md);
    }

    .stat-divider {
        display: none;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .benefits-content {
        grid-template-columns: 1fr;
    }

    .footer-links {
        justify-content: flex-start;
        flex-direction: column;
        gap: var(--spacing-lg);
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .container {
        padding: 0 var(--spacing-md);
    }
}