/* Сброс стилей и базовые настройки */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --accent-color: #f093fb;
    --success-color: #4ade80;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --background: #f8fafc;
    --surface: #ffffff;
    --border: #e5e7eb;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: var(--surface);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    animation: slideUp 0.6s ease-out;
}

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

/* Заголовок */
header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 40px 30px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="white" opacity="0.1"/><circle cx="75" cy="75" r="1" fill="white" opacity="0.1"/><circle cx="50" cy="10" r="0.5" fill="white" opacity="0.1"/><circle cx="10" cy="60" r="0.5" fill="white" opacity="0.1"/><circle cx="90" cy="40" r="0.5" fill="white" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    pointer-events: none;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    position: relative;
    z-index: 1;
}

header p {
    font-size: 1.1rem;
    opacity: 0.9;
    position: relative;
    z-index: 1;
}

/* Основной контент */
main {
    padding: 40px 30px;
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
}

.form-container {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.form-container:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.input-group,
.result-group {
    margin-bottom: 25px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
}

input[type="text"] {
    width: 100%;
    padding: 15px 18px;
    border: 2px solid var(--border);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
    background: var(--background);
}

input[type="text"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    background: var(--surface);
}

input[type="text"]::placeholder {
    color: var(--text-secondary);
}

input[readonly] {
    background: var(--background);
    cursor: default;
}

/* Кнопка */
.proceed-btn {
    width: 100%;
    padding: 16px 24px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.proceed-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.proceed-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.loading-spinner {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top: 2px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    display: none;
}

.proceed-btn.loading .loading-spinner {
    display: block;
}

.proceed-btn.loading span {
    opacity: 0.7;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Информационная панель */
.info-panel {
    background: linear-gradient(135deg, #f0f9ff, #e0f2fe);
    border: 1px solid #bae6fd;
    border-radius: var(--border-radius);
    padding: 25px;
    margin-top: 10px;
}

.info-panel h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.2rem;
}

.info-panel ol {
    padding-left: 20px;
}

.info-panel li {
    margin-bottom: 8px;
    color: var(--text-secondary);
}

/* Подвал */
footer {
    background: var(--background);
    padding: 20px 30px;
    text-align: center;
    border-top: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Адаптивность */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }
    
    .container {
        margin: 0;
    }
    
    header {
        padding: 30px 20px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    main {
        padding: 30px 20px;
    }
    
    .form-container {
        padding: 20px;
    }
}

@media (min-width: 769px) {
    main {
        grid-template-columns: 2fr 1fr;
        align-items: start;
    }
}

/* Анимации успеха */
.success-animation {
    animation: successPulse 0.6s ease-out;
}

@keyframes successPulse {
    0% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(74, 222, 128, 0.7);
    }
    50% {
        transform: scale(1.02);
        box-shadow: 0 0 0 10px rgba(74, 222, 128, 0);
    }
    100% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(74, 222, 128, 0);
    }
}

/* Темная тема (опционально) */
@media (prefers-color-scheme: dark) {
    :root {
        --text-primary: #f9fafb;
        --text-secondary: #d1d5db;
        --background: #111827;
        --surface: #1f2937;
        --border: #374151;
    }
    
    body {
        background: linear-gradient(135deg, #1f2937 0%, #111827 100%);
    }
}


/* Анимации ошибок */
.error-animation {
    animation: errorPulse 0.6s ease-out;
    border-color: #ef4444 !important;
}

@keyframes errorPulse {
    0% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.7);
    }
    50% {
        transform: scale(1.02);
        box-shadow: 0 0 0 10px rgba(239, 68, 68, 0);
    }
    100% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(239, 68, 68, 0);
    }
}

/* Стили для ошибок */
input.error-animation {
    background: #fef2f2;
    color: #dc2626;
}

/* Улучшенные стили для кнопок примеров */
.example-btn.error-example {
    background: #fee2e2;
    border-color: #fecaca;
    color: #dc2626;
}

.example-btn.error-example:hover {
    background: #dc2626;
    color: white;
}