/* ===== CSS ЗМІННІ ДЛЯ ТЕМ ===== */
:root {
    /* ===== ФОНИ ===== */
    --bg-primary: #0a0f1f;
    --bg-secondary: #0f172a;
    --bg-tertiary: #162033;
    
    /* ===== ТЕКСТ ===== */
    --text-primary: #e6edf3;
    --text-secondary: #9aa4b2;
    --text-muted: #6b7280;
    
    /* ===== АКЦЕНТИ (СИНЬО-ЦИАНОВІ) ===== */
    --accent-primary: #06b6d4;
    --accent-secondary: #0891b2;
    --accent-success: #10b981;
    --accent-warning: #f59e0b;
    --accent-danger: #ef4444;
    
    /* ===== ІНТЕРФЕЙС ===== */
    --border-color: rgba(255, 255, 255, 0.08);
    --shadow-color: rgba(0, 0, 0, 0.3);
    --card-bg: rgba(255, 255, 255, 0.035);
    
    /* ===== ШАПКА ===== */
    --header-bg: rgba(10, 15, 31, 0.75);
    --header-text: #e6edf3;
    
    /* ===== ФУТЕР ===== */
    --footer-bg: #0a0f1f;
    --footer-text: #9aa4b2;
    
    /* ===== ЕФЕКТИ ===== */
    --glow: 0 0 30px rgba(6, 182, 212, 0.45);
    --radius: 12px;
    --transition: 0.25s ease;
    
    /* ===== ФОН СТОРІНКИ ===== */
    --page-bg-image: url('/assets/img/background/background-black-tems.svg');
}

/* ===== СВІТЛА ТЕМА ===== */
[data-theme="light"] {
    /* ===== ФОНИ ===== */
    --bg-primary: #f4f7fb;
    --bg-secondary: #ffffff;
    --bg-tertiary: #eef2f7;
    
    /* ===== ТЕКСТ ===== */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    
    /* ===== АКЦЕНТИ ===== */
    --accent-primary: #0891b2;
    --accent-secondary: #0e7490;
    --accent-success: #059669;
    --accent-warning: #d97706;
    --accent-danger: #dc2626;
    
    /* ===== ІНТЕРФЕЙС ===== */
    --border-color: rgba(0, 0, 0, 0.08);
    --shadow-color: rgba(0, 0, 0, 0.1);
    --card-bg: rgba(0, 0, 0, 0.035);
    
    /* ===== ШАПКА ===== */
    --header-bg: rgba(255, 255, 255, 0.8);
    --header-text: #0f172a;
    
    /* ===== ФУТЕР ===== */
    --footer-bg: #f4f7fb;
    --footer-text: #475569;
    
    /* ===== ЕФЕКТИ ===== */
    --glow: 0 0 20px rgba(8, 145, 178, 0.35);
    
    /* ===== ФОН СТОРІНКИ ===== */
    --page-bg-image: url('/assets/img/background/background-white-tems.svg');
}

/* ===== АВТОМАТИЧНА ТЕМА ===== */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --bg-primary: #0a0f1f;
        --bg-secondary: #0f172a;
        --bg-tertiary: #162033;
        --text-primary: #e6edf3;
        --text-secondary: #9aa4b2;
        --page-bg-image: url('/assets/img/background/background-black-tems.svg');
    }
}

/* ===== БАЗОВІ СТИЛІ ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-primary);
    background-image: var(--page-bg-image);
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    transition: background-color var(--transition);
}

/* ===== ШАПКА ===== */
.site-header {
    background: var(--header-bg);
    color: var(--header-text);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    color: var(--header-text);
    text-decoration: none;
    font-size: 1.5rem;
    font-weight: 700;
    transition: color var(--transition);
}

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

.nav-list {
    display: flex;
    list-style: none;
    gap: 2rem;
    margin: 0;
    padding: 0;
}

.nav-list a {
    color: var(--header-text);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    transition: all var(--transition);
    font-weight: 500;
}

.nav-list a:hover {
    color: var(--accent-primary);
    background: rgba(6, 182, 212, 0.1);
}

.theme-toggle {
    background: rgba(6, 182, 212, 0.1);
    border: 2px solid var(--accent-primary);
    color: var(--accent-primary);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transition: all var(--transition);
    margin-left: 1rem;
}

.theme-toggle:hover {
    background: rgba(6, 182, 212, 0.2);
    transform: rotate(15deg);
    box-shadow: var(--glow);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--header-text);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
}

/* ===== ОСНОВНИЙ КОНТЕНТ ===== */
.main-content {
    flex: 1;
    padding: 3rem 1.5rem;
    max-width: 1200px;
    margin: 2rem auto;
    width: 100%;
    background: var(--card-bg);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
}

.main-content h1 {
    color: var(--accent-primary);
    margin-bottom: 1.5rem;
    font-size: 2.5rem;
    font-weight: 700;
}

.main-content p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.7;
}

.main-content a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color var(--transition);
}

.main-content a:hover {
    color: var(--accent-secondary);
    text-decoration: underline;
}

/* ===== КНОПКИ ===== */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background: var(--accent-primary);
    color: white;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    font-weight: 600;
    transition: all var(--transition);
    text-decoration: none;
}

.btn:hover {
    background: var(--accent-secondary);
    transform: translateY(-2px);
    box-shadow: var(--glow);
}

/* ===== АДАПТИВНІСТЬ ===== */
@media (max-width: 768px) {
    .mobile-menu-btn {
        display: block;
    }
    
    .nav-list {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--header-bg);
        flex-direction: column;
        padding: 1rem;
        backdrop-filter: blur(20px);
    }
    
    .nav-list.show {
        display: flex;
    }
    
    .nav-list a {
        padding: 1rem;
        text-align: center;
        border-bottom: 1px solid var(--border-color);
    }
    
    .main-content {
        padding: 2rem 1rem;
        margin: 1rem;
    }
    
    .main-content h1 {
        font-size: 2rem;
    }
}