/* ========================================
   Сочи Гид — CSS Styles
   Modern, Sea-themed Design
   ======================================== */

/* CSS Variables */
:root {
    /* Colors - Sea Theme */
    --primary: #0891b2;
    --primary-dark: #0e7490;
    --primary-light: #22d3ee;
    --secondary: #f97316;
    --accent: #fbbf24;
    
    /* Gradients */
    --gradient-sea: linear-gradient(135deg, #0891b2 0%, #0e7490 50%, #164e63 100%);
    --gradient-sunset: linear-gradient(135deg, #f97316 0%, #ea580c 50%, #c2410c 100%);
    --gradient-sky: linear-gradient(180deg, #0ea5e9 0%, #38bdf8 50%, #7dd3fc 100%);
    --gradient-hero: linear-gradient(135deg, #0c4a6e 0%, #0e7490 40%, #0891b2 100%);
    
    /* Neutrals */
    --white: #ffffff;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    
    /* Typography */
    --font-display: 'Playfair Display', Georgia, serif;
    --font-body: 'Montserrat', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* Spacing */
    --container-max: 1200px;
    --section-padding: 80px;
    
    /* Effects */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    --radius-sm: 6px;
    --radius: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    color: var(--gray-800);
    background: var(--gray-50);
    min-height: 100vh;
    overflow-x: hidden;
}

/* Container */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

/* Background Animation */
.bg-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
    background: var(--gradient-hero);
}

.wave {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 200%;
    height: 200px;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 320'%3E%3Cpath fill='%23ffffff' fill-opacity='0.1' d='M0,192L48,197.3C96,203,192,213,288,229.3C384,245,480,267,576,250.7C672,235,768,181,864,181.3C960,181,1056,235,1152,234.7C1248,235,1344,181,1392,154.7L1440,128L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z'%3E%3C/path%3E%3C/svg%3E") repeat-x;
    background-size: 50% 100%;
    animation: wave 25s linear infinite;
}

.wave1 { opacity: 0.3; animation-duration: 25s; bottom: 0; }
.wave2 { opacity: 0.2; animation-duration: 20s; bottom: 20px; }
.wave3 { opacity: 0.1; animation-duration: 15s; bottom: 40px; }

@keyframes wave {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 16px 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: var(--gray-900);
}

.logo-icon {
    font-size: 28px;
}

.logo-text {
    font-family: var(--font-display);
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-dark);
}

.nav {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav a {
    text-decoration: none;
    color: var(--gray-600);
    font-weight: 500;
    font-size: 15px;
    transition: var(--transition);
}

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

.nav-chat {
    background: var(--gradient-sea);
    color: var(--white) !important;
    padding: 8px 16px;
    border-radius: var(--radius-full);
}

.nav-chat:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Auth Navigation */
.auth-nav {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-left: 16px;
    padding-left: 16px;
    border-left: 1px solid var(--gray-200);
}

.auth-nav .nav-link,
.auth-nav .nav-login,
.auth-nav .nav-account {
    color: var(--gray-600);
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
    transition: var(--transition);
}

.auth-nav .nav-link:hover,
.auth-nav .nav-login:hover,
.auth-nav .nav-account:hover {
    color: var(--primary);
}

.auth-nav .nav-account {
    background: var(--gray-100);
    padding: 6px 12px;
    border-radius: var(--radius-full);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 0 80px;
    position: relative;
}

.hero-content {
    max-width: 700px;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(40px, 6vw, 64px);
    font-weight: 700;
    line-height: 1.1;
    color: var(--white);
    margin-bottom: 24px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--accent) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 20px;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 40px;
    line-height: 1.7;
}

.hero-stats {
    display: flex;
    gap: 48px;
    margin-top: 60px;
}

.stat {
    text-align: center;
}

.stat-value {
    display: block;
    font-size: 32px;
    font-weight: 700;
    color: var(--white);
}

.stat-label {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    font-family: var(--font-body);
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary {
    background: var(--gradient-sunset);
    color: var(--white);
    box-shadow: 0 4px 14px rgba(249, 115, 22, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(249, 115, 22, 0.5);
}

.btn-lg {
    padding: 18px 36px;
    font-size: 18px;
}

.btn-block {
    width: 100%;
}

.btn-icon {
    transition: transform 0.3s ease;
}

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

.btn-loader {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.btn-loader.hidden {
    display: none;
}

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

/* Planner Section */
.planner-section {
    background: var(--white);
    padding: var(--section-padding) 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-header h2 {
    font-family: var(--font-display);
    font-size: 36px;
    color: var(--gray-900);
    margin-bottom: 12px;
}

.section-header p {
    color: var(--gray-500);
    font-size: 18px;
}

/* Quick Input Card */
.quick-input-card {
    background: linear-gradient(135deg, #ecfeff 0%, #f0fdfa 100%);
    border: 2px solid var(--primary-light);
    border-radius: var(--radius-xl);
    padding: 32px;
    margin-bottom: 40px;
}

.quick-input-header {
    margin-bottom: 20px;
}

.quick-badge {
    display: inline-block;
    background: var(--primary);
    color: var(--white);
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 8px;
}

.quick-input-header h3 {
    font-size: 20px;
    color: var(--gray-800);
}

.quick-textarea {
    width: 100%;
    padding: 16px;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius);
    font-family: var(--font-body);
    font-size: 16px;
    resize: none;
    margin-bottom: 16px;
    transition: var(--transition);
}

.quick-textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(8, 145, 178, 0.1);
}

/* Divider */
.divider {
    display: flex;
    align-items: center;
    gap: 16px;
    margin: 40px 0;
    color: var(--gray-400);
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--gray-200);
}

/* Form */
.planner-form {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: 40px;
    box-shadow: var(--shadow-lg);
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    margin-bottom: 32px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

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

.form-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 12px;
}

.label-icon {
    font-size: 18px;
}

.form-input {
    padding: 14px 16px;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius);
    font-family: var(--font-body);
    font-size: 16px;
    transition: var(--transition);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(8, 145, 178, 0.1);
}

/* Date inputs */
.date-inputs {
    display: flex;
    align-items: center;
    gap: 12px;
}

.date-inputs .form-input {
    flex: 1;
}

.date-separator {
    color: var(--gray-400);
    font-size: 20px;
}

/* Budget input */
.budget-input {
    position: relative;
}

.budget-input .form-input {
    width: 100%;
    padding-right: 40px;
}

.input-suffix {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray-400);
    font-weight: 600;
}

.budget-presets {
    display: flex;
    gap: 8px;
    margin-top: 12px;
}

.preset-btn {
    padding: 8px 16px;
    background: var(--gray-100);
    border: none;
    border-radius: var(--radius-full);
    font-size: 14px;
    font-weight: 500;
    color: var(--gray-600);
    cursor: pointer;
    transition: var(--transition);
}

.preset-btn:hover {
    background: var(--primary);
    color: var(--white);
}

/* Travelers */
.travelers-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.traveler-input label {
    display: block;
    font-size: 14px;
    color: var(--gray-500);
    margin-bottom: 8px;
}

.counter {
    display: flex;
    align-items: center;
    gap: 12px;
}

.counter-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gray-100);
    border: none;
    border-radius: var(--radius);
    font-size: 20px;
    color: var(--gray-600);
    cursor: pointer;
    transition: var(--transition);
}

.counter-btn:hover {
    background: var(--primary);
    color: var(--white);
}

.counter input {
    width: 50px;
    text-align: center;
    font-size: 18px;
    font-weight: 600;
    border: none;
    background: transparent;
}

/* Child ages */
.child-ages {
    margin-top: 16px;
}

.child-ages label {
    display: block;
    font-size: 14px;
    color: var(--gray-500);
    margin-bottom: 8px;
}

.child-ages-inputs {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.child-ages-inputs input {
    width: 60px;
    padding: 8px;
    text-align: center;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius);
}

/* District cards */
.district-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.district-card {
    cursor: pointer;
}

.district-card input {
    display: none;
}

.district-content {
    padding: 16px;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius);
    transition: var(--transition);
}

.district-card input:checked + .district-content {
    border-color: var(--primary);
    background: rgba(8, 145, 178, 0.05);
}

.district-card-all .district-content {
    background: linear-gradient(135deg, #ecfeff 0%, #f0fdfa 100%);
}

.district-card-all input:checked + .district-content {
    background: linear-gradient(135deg, #cffafe 0%, #ccfbf1 100%);
    border-color: var(--primary);
}

.district-name {
    display: block;
    font-weight: 600;
    color: var(--gray-800);
}

.district-desc {
    font-size: 13px;
    color: var(--gray-500);
}

/* Preferences */
.preferences-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.pref-chip {
    cursor: pointer;
}

.pref-chip input {
    display: none;
}

.pref-chip span {
    display: inline-block;
    padding: 10px 18px;
    background: var(--gray-100);
    border: 2px solid transparent;
    border-radius: var(--radius-full);
    font-size: 15px;
    transition: var(--transition);
}

.pref-chip:hover span {
    background: var(--gray-200);
}

.pref-chip input:checked + span {
    background: rgba(8, 145, 178, 0.1);
    border-color: var(--primary);
    color: var(--primary-dark);
}

/* How it Works Section */
.how-section {
    padding: var(--section-padding) 0;
    background: var(--gray-50);
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.step-card {
    background: var(--white);
    padding: 40px 32px;
    border-radius: var(--radius-xl);
    text-align: center;
    position: relative;
    box-shadow: var(--shadow);
}

.step-number {
    position: absolute;
    top: -16px;
    left: 50%;
    transform: translateX(-50%);
    width: 32px;
    height: 32px;
    background: var(--gradient-sea);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 14px;
}

.step-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.step-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
    color: var(--gray-800);
}

.step-card p {
    color: var(--gray-500);
}

/* Features Section */
.features-section {
    padding: var(--section-padding) 0;
    background: var(--white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.feature-card {
    padding: 32px 24px;
    background: var(--gray-50);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.feature-icon {
    font-size: 40px;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 18px;
    margin-bottom: 8px;
    color: var(--gray-800);
}

.feature-card p {
    font-size: 14px;
    color: var(--gray-500);
}

/* Footer */
.footer {
    background: var(--gray-900);
    padding: 40px 0;
}

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

.footer-brand {
    display: flex;
    align-items: center;
    gap: 8px;
}

.footer-brand .logo-text {
    color: var(--white);
}

.footer-copy {
    color: var(--gray-400);
    font-size: 14px;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.loading-overlay.hidden {
    display: none;
}

.loading-content {
    text-align: center;
    color: var(--white);
}

.loading-spinner {
    width: 60px;
    height: 60px;
    border: 4px solid rgba(255, 255, 255, 0.2);
    border-top-color: var(--primary-light);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 24px;
}

.loading-content h3 {
    font-size: 24px;
    margin-bottom: 8px;
}

.loading-status {
    color: var(--gray-400);
}

/* Utilities */
.hidden {
    display: none !important;
}

/* Responsive */
@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav {
        display: none;
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 24px;
        align-items: flex-start;
    }
    
    .form-grid {
        grid-template-columns: 1fr;
    }
    
    .steps-grid {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
    
    .district-cards {
        grid-template-columns: 1fr;
    }
}