/* ==========================================
   MicroChess — Base Styles
   Variables, Reset, Typography, Layout
   ========================================== */

@import url('https://fonts.googleapis.com/css2?family=Vazirmatn:wght@300;400;500;600;700&display=swap');

/* ---------- CSS Variables ---------- */
:root {
    --color-primary: #4a90d9;
    --color-primary-dark: #357abd;
    --color-success: #27ae60;
    --color-success-dark: #1e8449;
    --color-danger: #e74c3c;
    --color-danger-dark: #c0392b;
    --color-warning: #f39c12;
    --color-warning-dark: #d68910;
    --color-orange: #e67e22;

    --color-bg: #1a1a2e;
    --color-bg-elevated: #16213e;
    --color-bg-input: #10192f;
    --color-bg-card: #1c2541;
    --color-text: #e0e0e0;
    --color-text-secondary: #b0b8c8;
    --color-text-muted: #8892a0;
    --color-border: #2a3a5c;
    --color-border-light: #344566;

    --board-light: #f0d9b5;
    --board-dark: #b58863;

    --hl-selected: rgba(52, 152, 219, 0.6);
    --hl-correct: rgba(46, 204, 113, 0.6);
    --hl-wrong: rgba(231, 76, 60, 0.6);
    --hl-missed: rgba(241, 196, 15, 0.6);

    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;

    --font-base: 'Vazirmatn', Tahoma, Arial, sans-serif;

    --board-size: 400px;

    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
}

/* ---------- Reset ---------- */
*, *::before, *::after {
    box-sizing: border-box;
}

body, h1, h2, h3, h4, p, ul, ol, figure {
    margin: 0;
}

body {
    font-family: var(--font-base);
    background: var(--color-bg);
    color: var(--color-text);
    font-size: 0.95rem;
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

img {
    max-width: 100%;
    display: block;
}

button {
    font-family: inherit;
    cursor: pointer;
}

/* ---------- Site Header ---------- */
.site-header {
    background: var(--color-bg-elevated);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-md) var(--space-lg);
    position: sticky;
    top: 0;
    z-index: 100;
}

.site-header__inner {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-header__logo {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-text) !important;
    letter-spacing: -0.3px;
}

.site-header__nav {
    display: flex;
    gap: var(--space-md);
}

.site-header__nav a {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    transition: color var(--transition-fast);
}

.site-header__nav a:hover {
    color: var(--color-text);
}

/* ---------- Site Main ---------- */
.site-main {
    flex: 1;
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: var(--space-xl) var(--space-md);
}

/* ---------- Site Footer ---------- */
.site-footer {
    background: var(--color-bg-elevated);
    border-top: 1px solid var(--color-border);
    padding: var(--space-lg) var(--space-md);
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.8rem;
}

/* ---------- Responsive ---------- */
@media (max-width: 480px) {
    :root {
        --board-size: 92vw;
    }

    .site-header {
        padding: var(--space-sm) var(--space-md);
    }

    .site-header__logo {
        font-size: 1.1rem;
    }

    .site-main {
        padding: var(--space-lg) var(--space-sm);
    }
}