/* ==========================================
   CSS VARIABLES & DESIGN TOKENS
   ========================================== */
:root {
    /* Colors - Beach Sunset Theme */
    --color-primary: #FF6B35;
    /* Coral */
    --color-primary-dark: #E85A2A;
    --color-primary-light: #FF8C61;

    --color-secondary: #00D4FF;
    /* Turquoise */
    --color-secondary-dark: #00B8E0;
    --color-secondary-light: #33DDFF;

    --color-accent: #FFD23F;
    /* Golden Sand */
    --color-accent-dark: #E6BD35;

    --color-bg-primary: #0A0E27;
    /* Deep Navy */
    --color-bg-secondary: #151B3D;
    --color-bg-card: rgba(255, 255, 255, 0.05);

    --color-text-primary: #FFFFFF;
    --color-text-secondary: #B8C5D6;
    --color-text-muted: #7A8BA3;

    --color-success: #00E676;
    --color-error: #FF5252;
    --color-warning: #FFD740;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #FF6B35 0%, #F7931E 100%);
    --gradient-secondary: linear-gradient(135deg, #00D4FF 0%, #0099CC 100%);
    --gradient-sunset: linear-gradient(180deg, #0A0E27 0%, #1A1F4D 50%, #2D1B4E 100%);
    --gradient-hero: linear-gradient(135deg, rgba(255, 107, 53, 0.1) 0%, rgba(0, 212, 255, 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: 'Poppins', sans-serif;
    --font-secondary: 'Inter', sans-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: 3rem;
    --font-size-6xl: 4rem;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 32px rgba(255, 107, 53, 0.3);
    --shadow-glow-secondary: 0 0 32px rgba(0, 212, 255, 0.3);

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

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

    /* Glass Effect */
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-blur: blur(20px);
}

/* ==========================================
   RESET & BASE STYLES
   ========================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-secondary);
    background: var(--gradient-sunset);
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

/* ==========================================
   TYPOGRAPHY
   ========================================== */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-primary);
    font-weight: 700;
    line-height: 1.2;
}

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

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ==========================================
   HERO SECTION
   ========================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    background: var(--gradient-hero);
    padding: var(--spacing-2xl) var(--spacing-lg);
}

.hero-content {
    text-align: center;
    z-index: 2;
    max-width: 900px;
    animation: fadeInUp 1s ease;
}

.hero-badge {
    display: inline-block;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    animation: pulse 2s infinite;
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.title-line {
    display: block;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* Floating Decorations */
.hero-decoration {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 1;
}

.floating-ball {
    position: absolute;
    font-size: 3rem;
    animation: float 6s ease-in-out infinite;
    opacity: 0.3;
}

.ball-1 {
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.ball-2 {
    top: 60%;
    right: 15%;
    animation-delay: 2s;
}

.ball-3 {
    bottom: 20%;
    left: 20%;
    animation-delay: 4s;
}

/* ==========================================
   BUTTONS
   ========================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-full);
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    font-weight: 600;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transform: translateX(-100%);
    transition: transform var(--transition-slow);
}

.btn:hover::before {
    transform: translateX(100%);
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 48px rgba(255, 107, 53, 0.5);
}

.btn-secondary {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border: 2px solid var(--glass-border);
    color: white;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.btn-submit {
    width: 100%;
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-glow);
    font-size: var(--font-size-lg);
    padding: var(--spacing-lg) var(--spacing-xl);
}

.btn-submit:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 0 48px rgba(255, 107, 53, 0.5);
}

.btn-submit:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-submit.loading .btn-text {
    opacity: 0;
}

.btn-submit.loading .btn-loader {
    display: block;
}

.btn-loader {
    display: none;
    position: absolute;
    width: 24px;
    height: 24px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

/* ==========================================
   SECTIONS
   ========================================== */
.about,
.registration {
    padding: var(--spacing-3xl) 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    margin-bottom: var(--spacing-md);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ==========================================
   INFO GRID
   ========================================== */
.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.info-card {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    transition: all var(--transition-base);
    animation: fadeInUp 0.6s ease backwards;
}

.info-card:nth-child(1) {
    animation-delay: 0.1s;
}

.info-card:nth-child(2) {
    animation-delay: 0.2s;
}

.info-card:nth-child(3) {
    animation-delay: 0.3s;
}

.info-card:nth-child(4) {
    animation-delay: 0.4s;
}

.info-card:hover {
    transform: translateY(-8px);
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow-lg);
}

.info-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.info-card h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary-light);
}

.info-card p {
    color: var(--color-text-secondary);
    line-height: 1.8;
}

/* ==========================================
   FEATURES
   ========================================== */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.feature-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--glass-bg);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.feature-item:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateX(8px);
}

.feature-check {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: var(--gradient-primary);
    border-radius: 50%;
    font-weight: bold;
    flex-shrink: 0;
}

/* ==========================================
   FORM STYLES
   ========================================== */
.form-container {
    max-width: 800px;
    margin: 0 auto;
}

.registration-form {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-xl);
}

.form-section {
    margin-bottom: var(--spacing-2xl);
}

.form-section:last-of-type {
    margin-bottom: var(--spacing-xl);
}

.form-section-title {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--glass-border);
    color: var(--color-primary-light);
}

.form-row {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.form-group {
    flex: 1;
    min-width: 200px;
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-secondary);
}

.form-input,
.form-select {
    width: 100%;
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.05);
    border: 2px solid var(--glass-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-family: var(--font-secondary);
    font-size: var(--font-size-base);
    transition: all var(--transition-base);
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--color-primary);
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 0 0 4px rgba(255, 107, 53, 0.1);
}

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

.form-select {
    cursor: pointer;
}

.form-select option {
    background: var(--color-bg-secondary);
    color: var(--color-text-primary);
}

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

.form-checkbox {
    width: 24px;
    height: 24px;
    min-width: 24px;
    min-height: 24px;
    cursor: pointer;
    accent-color: var(--color-primary);
    margin-top: 2px;
}

.checkbox-text {
    flex: 1;
    color: var(--color-text-secondary);
    line-height: 1.6;
    font-size: var(--font-size-sm);
}

.form-error {
    display: block;
    color: var(--color-error);
    font-size: var(--font-size-xs);
    margin-top: var(--spacing-xs);
    min-height: 1rem;
}

.form-input.error,
.form-select.error {
    border-color: var(--color-error);
}

.form-actions {
    margin-top: var(--spacing-xl);
}

.form-message {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    text-align: center;
    font-weight: 600;
    display: none;
}

.form-message.success {
    display: block;
    background: rgba(0, 230, 118, 0.1);
    border: 2px solid var(--color-success);
    color: var(--color-success);
}

.form-message.error {
    display: block;
    background: rgba(255, 82, 82, 0.1);
    border: 2px solid var(--color-error);
    color: var(--color-error);
}

/* ==========================================
   FOOTER
   ========================================== */
.footer {
    background: var(--color-bg-primary);
    border-top: 1px solid var(--glass-border);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    margin-top: var(--spacing-3xl);
}

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

.footer-section h3,
.footer-section h4 {
    margin-bottom: var(--spacing-md);
    color: var(--color-primary-light);
}

.footer-section p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.social-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color var(--transition-base);
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--glass-border);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

/* ==========================================
   ANIMATIONS
   ========================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

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

@keyframes float {

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

    50% {
        transform: translateY(-20px) rotate(5deg);
    }
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.7;
    }
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* ==========================================
   RESPONSIVE DESIGN
   ========================================== */
@media (max-width: 768px) {
    :root {
        --spacing-xl: 2rem;
        --spacing-2xl: 3rem;
        --spacing-3xl: 4rem;
    }

    .hero {
        min-height: 80vh;
        padding: var(--spacing-xl) var(--spacing-md);
    }

    .hero-cta {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .registration-form {
        padding: var(--spacing-lg);
    }

    .form-row {
        flex-direction: column;
    }

    .form-group {
        min-width: 100%;
    }

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

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

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .social-links {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .floating-ball {
        font-size: 2rem;
    }
}