/* AI Platform - Основные стили */

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

:root {
    /* Светлая цветовая палитра (улучшенная) */
    --primary: #4A90E2;
    --primary-hover: #357ABD;
    --primary-light: #E3F2FD;
    --primary-dark: #2874C8;
    
    --secondary: #50C878;
    --secondary-hover: #45B369;
    --secondary-light: #E8F5E9;
    --secondary-dark: #3DA662;
    
    --accent: #9C27B0;
    --danger: #E74C3C;
    --warning: #F39C12;
    --success: #27AE60;
    --info: #3498DB;
    
    /* Фоны - улучшенная контрастность */
    --bg-primary: #FFFFFF;
    --bg-secondary: #F8F9FA;
    --bg-tertiary: #E9ECEF;
    --bg-card: #FFFFFF;
    --bg-hover: #F1F3F5;
    
    /* Текст - улучшенная читаемость */
    --text-primary: #212529;
    --text-secondary: #6C757D;
    --text-light: #ADB5BD;
    --text-white: #FFFFFF;
    --text-dark: #000000;
    
    /* Границы */
    --border-color: #DEE2E6;
    --border-light: #E9ECEF;
    --border-dark: #CED4DA;
    
    /* Тени - более выразительные */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 12px 24px rgba(0, 0, 0, 0.18);
    --shadow-2xl: 0 20px 40px rgba(0, 0, 0, 0.22);
    
    /* Градиенты */
    --gradient-primary: linear-gradient(135deg, var(--primary), var(--primary-dark));
    --gradient-secondary: linear-gradient(135deg, var(--secondary), var(--secondary-dark));
    --gradient-hero: linear-gradient(135deg, var(--primary-light), var(--secondary-light));
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background: var(--bg-primary);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: transform 0.3s;
}

.logo:hover {
    transform: scale(1.05);
}

.logo span {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
    align-items: center;
}

.nav-links a {
    color: var(--text-primary);
    text-decoration: none;
    transition: color 0.3s;
    font-weight: 500;
    position: relative;
}

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

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 0;
    background: var(--primary);
    transition: width 0.3s;
}

.nav-links a:hover::after {
    width: 100%;
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn-secondary:hover {
    background: var(--primary);
    color: var(--text-white) !important;
}

/* Стили для кнопки регистрации в header */
header .nav-links .btn-primary {
    background: var(--primary);
    color: var(--text-white) !important;
}

header .nav-links .btn-primary:hover {
    background: var(--primary-hover);
    color: var(--text-white) !important;
}

/* Социальные кнопки */
.social-links {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--bg-secondary);
    color: var(--primary);
    transition: all 0.3s;
    text-decoration: none !important;
}

.social-link:hover {
    background: var(--primary);
    color: var(--text-white) !important;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.social-link::after {
    display: none !important;
}

.btn-success {
    background: var(--secondary);
    color: var(--text-white);
}

.btn-success:hover {
    background: var(--secondary-hover);
}

.btn-danger {
    background: var(--danger);
    color: var(--text-white);
}

.btn-danger:hover {
    background: #C0392B;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

/* Cards */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    transition: all 0.3s;
    box-shadow: var(--shadow-sm);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-weight: 600;
}

.form-control {
    width: 100%;
    padding: 0.75rem;
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.form-control::placeholder {
    color: var(--text-light);
}

/* Footer */
footer {
    background: var(--bg-primary);
    padding: 2rem 0;
    margin-top: 4rem;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s;
}

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

/* Alerts */
.alert {
    padding: 1rem 1.5rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    border-left: 4px solid;
    animation: slideIn 0.3s ease-out;
}

.alert-success {
    background: var(--secondary-light);
    border-color: var(--success);
    color: #1E7E34;
}

.alert-danger {
    background: #FADBD8;
    border-color: var(--danger);
    color: #943126;
}

.alert-info {
    background: var(--primary-light);
    border-color: var(--primary);
    color: #1565C0;
}

.alert-warning {
    background: #FFF3CD;
    border-color: var(--warning);
    color: #856404;
}

/* User Info */
.user-info {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.5rem 1rem;
    background: var(--bg-secondary);
    border-radius: 8px;
}

.user-balance {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    color: var(--secondary);
}

/* Loading */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--border-light);
    border-radius: 50%;
    border-top-color: var(--primary);
    animation: spin 0.8s linear infinite;
}

/* Animations */
@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.animate-slide-in {
    animation: slideIn 0.5s ease-out;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        gap: 1rem;
    }

    .container {
        padding: 0 15px;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .btn {
        width: 100%;
    }
}