/* ==========================================
   Program Pro Učitele - Landing Page Styles
   Inspired by Reflect.app
   ========================================== */

:root {
    /* Colors */
    --bg-dark: #0a0a0f;
    --bg-card: rgba(255, 255, 255, 0.03);
    --bg-card-hover: rgba(255, 255, 255, 0.05);
    --border-subtle: rgba(255, 255, 255, 0.08);
    --border-focus: rgba(139, 92, 246, 0.5);
    
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.6);
    --text-muted: rgba(255, 255, 255, 0.4);
    
    --accent-purple: #8B5CF6;
    --accent-cyan: #06B6D4;
    --accent-green: #10B981;
    
    --gradient-primary: linear-gradient(135deg, #8B5CF6 0%, #06B6D4 100%);
    --gradient-glow: radial-gradient(circle at center, rgba(139, 92, 246, 0.15) 0%, transparent 70%);
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --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;
    
    /* Effects */
    --blur-sm: 8px;
    --blur-md: 16px;
    --blur-lg: 32px;
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font-family);
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ==========================================
   Intro Animation
   ========================================== */
.intro-overlay {
    position: fixed;
    inset: 0;
    z-index: 1000;
    background: var(--bg-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.6s ease, visibility 0.6s ease;
}

.intro-overlay.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.intro-content {
    text-align: center;
    animation: introFadeIn 0.8s ease forwards;
}

@keyframes introFadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.intro-logo {
    margin-bottom: var(--space-xl);
}

.intro-icon {
    width: 100px;
    height: 100px;
    animation: logoFloat 3s ease-in-out infinite;
}

@keyframes logoFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.circle-bg {
    stroke-dasharray: 283;
    stroke-dashoffset: 283;
    animation: circleDraw 1.5s ease forwards 0.3s;
}

@keyframes circleDraw {
    to { stroke-dashoffset: 0; }
}

.brain-path {
    stroke-dasharray: 200;
    stroke-dashoffset: 200;
    animation: brainDraw 1.5s ease forwards 0.6s;
}

@keyframes brainDraw {
    to { stroke-dashoffset: 0; }
}

.dot {
    opacity: 0;
    animation: dotAppear 0.4s ease forwards;
}

.dot-1 { animation-delay: 1.2s; }
.dot-2 { animation-delay: 1.4s; }
.dot-3 { animation-delay: 1.6s; }

@keyframes dotAppear {
    from {
        opacity: 0;
        transform: scale(0);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.connection {
    stroke-dasharray: 50;
    stroke-dashoffset: 50;
    animation: connectionDraw 0.5s ease forwards;
}

.conn-1 { animation-delay: 1.8s; }
.conn-2 { animation-delay: 2s; }
.conn-3 { animation-delay: 2.2s; }

@keyframes connectionDraw {
    to { stroke-dashoffset: 0; }
}

.intro-title {
    font-size: var(--font-size-3xl);
    font-weight: 600;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--space-sm);
    opacity: 0;
    animation: textFadeIn 0.6s ease forwards 0.8s;
}

.intro-subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    opacity: 0;
    animation: textFadeIn 0.6s ease forwards 1s;
}

@keyframes textFadeIn {
    to { opacity: 1; }
}

.intro-loader {
    width: 200px;
    height: 3px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    margin: var(--space-2xl) auto 0;
    overflow: hidden;
    opacity: 0;
    animation: textFadeIn 0.6s ease forwards 1.2s;
}

.loader-bar {
    height: 100%;
    width: 0%;
    background: var(--gradient-primary);
    border-radius: 3px;
    animation: loadProgress 2s ease forwards 1.4s;
}

@keyframes loadProgress {
    to { width: 100%; }
}

/* ==========================================
   Main Content
   ========================================== */
.main-content {
    opacity: 0;
    transition: opacity 0.6s ease;
    position: relative;
    min-height: 100vh;
}

.main-content.visible {
    opacity: 1;
}

/* Background Orbs */
.bg-orbs {
    position: fixed;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
    z-index: 0;
}

.orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    animation: orbFloat 20s ease-in-out infinite;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: var(--accent-purple);
    top: -200px;
    right: -200px;
    animation-delay: 0s;
}

.orb-2 {
    width: 500px;
    height: 500px;
    background: var(--accent-cyan);
    bottom: -150px;
    left: -150px;
    animation-delay: -7s;
}

.orb-3 {
    width: 400px;
    height: 400px;
    background: var(--accent-green);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -14s;
    opacity: 0.2;
}

@keyframes orbFloat {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(30px, -30px) scale(1.05); }
    50% { transform: translate(-20px, 20px) scale(0.95); }
    75% { transform: translate(-30px, -20px) scale(1.02); }
}

/* Container */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: var(--space-lg);
    position: relative;
    z-index: 1;
}

/* Header */
.header {
    padding: var(--space-lg) 0;
    margin-bottom: var(--space-2xl);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    font-weight: 600;
    font-size: var(--font-size-lg);
}

.logo-icon {
    width: 40px;
    height: 40px;
}

/* Hero */
.hero {
    text-align: center;
    padding: var(--space-3xl) 0;
    animation: heroFadeIn 0.8s ease forwards;
}

@keyframes heroFadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-title {
    font-size: clamp(var(--font-size-3xl), 5vw, var(--font-size-5xl));
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--space-lg);
    letter-spacing: -0.02em;
}

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

.hero-description {
    font-size: var(--font-size-xl);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.7;
}

/* Registration Section */
.registration-section {
    animation: sectionFadeIn 0.8s ease forwards 0.2s;
    opacity: 0;
}

@keyframes sectionFadeIn {
    to { opacity: 1; }
}

/* Card */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    backdrop-filter: blur(var(--blur-md));
    -webkit-backdrop-filter: blur(var(--blur-md));
    margin-bottom: var(--space-2xl);
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
    border-color: rgba(139, 92, 246, 0.2);
    box-shadow: 0 0 60px rgba(139, 92, 246, 0.1);
}

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

.card-header h2 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

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

/* Form */
.form {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
}

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

.form-group {
    position: relative;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

.form-group label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
}

.form-group.required label::after {
    content: ' *';
    color: var(--accent-purple);
}

.form-group input {
    width: 100%;
    padding: var(--space-md) var(--space-lg);
    padding-left: 48px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: var(--font-size-base);
    font-family: inherit;
    transition: all var(--transition-base);
}

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

.form-group input:hover {
    border-color: rgba(255, 255, 255, 0.15);
    background: rgba(255, 255, 255, 0.05);
}

.form-group input:focus {
    outline: none;
    border-color: var(--border-focus);
    background: rgba(139, 92, 246, 0.05);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}

.input-icon {
    position: absolute;
    left: var(--space-md);
    top: 50%;
    transform: translateY(25%);
    color: var(--text-muted);
    pointer-events: none;
    transition: color var(--transition-base);
}

.form-group input:focus + .input-icon,
.form-group input:not(:placeholder-shown) + .input-icon {
    color: var(--accent-purple);
}

.hint {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    margin-top: var(--space-xs);
}

/* Submit Button */
.submit-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    width: 100%;
    padding: var(--space-lg) var(--space-xl);
    background: var(--gradient-primary);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-size: var(--font-size-base);
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition-base);
    margin-top: var(--space-md);
    position: relative;
    overflow: hidden;
}

.submit-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.2) 0%, transparent 50%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 40px rgba(139, 92, 246, 0.4);
}

.submit-btn:hover::before {
    opacity: 1;
}

.submit-btn:active {
    transform: translateY(0);
}

.submit-btn svg {
    transition: transform var(--transition-base);
}

.submit-btn:hover svg {
    transform: translateX(4px);
}

/* Features */
.features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

@media (max-width: 768px) {
    .features {
        grid-template-columns: 1fr;
    }
}

.feature {
    text-align: center;
    padding: var(--space-xl);
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.feature:hover {
    background: var(--bg-card-hover);
    border-color: rgba(139, 92, 246, 0.2);
    transform: translateY(-4px);
}

.feature-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto var(--space-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    color: white;
}

.feature h3 {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

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

/* Footer */
.footer {
    text-align: center;
    padding: var(--space-3xl) 0 var(--space-xl);
    color: var(--text-muted);
    font-size: var(--font-size-sm);
}

/* ==========================================
   Success Modal
   ========================================== */
.modal {
    position: fixed;
    inset: 0;
    z-index: 1001;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(var(--blur-md));
    -webkit-backdrop-filter: blur(var(--blur-md));
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.modal.visible {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    padding: var(--space-3xl);
    text-align: center;
    max-width: 400px;
    transform: scale(0.9) translateY(20px);
    transition: transform var(--transition-slow);
}

.modal.visible .modal-content {
    transform: scale(1) translateY(0);
}

.modal-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--space-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.modal-icon.success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--accent-green);
    animation: iconPop 0.5s ease forwards;
}

@keyframes iconPop {
    0% { transform: scale(0); }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

.modal-content h2 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--space-md);
}

.modal-content p {
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
}

.modal-loader {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    color: var(--text-muted);
    font-size: var(--font-size-sm);
    margin-top: var(--space-lg);
}

.loader-spinner {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-subtle);
    border-top-color: var(--accent-purple);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Discord Info in Modal */
.discord-info {
    background: rgba(88, 101, 242, 0.1);
    border: 1px solid rgba(88, 101, 242, 0.3);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    margin: var(--space-lg) 0;
    text-align: left;
}

.discord-info h3 {
    color: #5865F2;
    font-size: var(--font-size-lg);
    margin-bottom: var(--space-xs);
}

.discord-desc {
    color: var(--text-muted);
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-md) !important;
}

.discord-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.discord-feature {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.discord-feature .feature-icon {
    font-size: 1rem;
}

.discord-steps {
    background: rgba(0, 0, 0, 0.2);
    border-radius: var(--radius-sm);
    padding: var(--space-md);
}

.discord-steps p {
    margin-bottom: var(--space-sm) !important;
    color: var(--text-primary);
    font-size: var(--font-size-sm);
}

.discord-steps ol {
    margin: 0;
    padding-left: var(--space-lg);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.discord-steps li {
    margin-bottom: var(--space-xs);
}

.discord-steps code {
    background: rgba(88, 101, 242, 0.3);
    padding: 0.125rem 0.375rem;
    border-radius: 4px;
    font-family: 'Fira Code', monospace;
    font-size: 0.8em;
    color: #5865F2;
}

/* ==========================================
   Utilities
   ========================================== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}