/* ============================================
   base.css — CSS Variables, Reset, Typography
   ============================================ */

/* ── CSS Variables ── */
:root {
    --bg-body: #0F1923;
    --bg-card: #162029;
    --bg-card-hover: #1B2838;
    --bg-header: rgba(15, 25, 35, 0.92);
    --bg-input: #0D1520;
    --bg-footer: #0A1018;

    --color-primary: #00BCD4;
    --color-primary-hover: #00ACC1;
    --color-primary-dark: #00838F;
    --color-accent: #26C6DA;
    --color-danger: #FF5252;
    --color-success: #4CAF50;

    --text-primary: #E0E6ED;
    --text-secondary: #8899AA;
    --text-heading: #FFFFFF;
    --text-muted: #5A6A7A;

    --border-color: #1E3040;
    --border-light: #2A3A4A;

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;    --transition: 0.25s ease;
    --max-width: 1400px;
}

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

html {
    scroll-behavior: smooth;
}

/* ── Body ── */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-body);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    padding-top: 84px; /* fixed header height offset */
}

/* ── Links ── */
a {
    text-decoration: none;
    color: var(--color-primary);
    transition: color var(--transition);
}

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

/* ── Images ── */
img {
    max-width: 100%;
    height: auto;
}

/* ── Main ── */
main {
    flex: 1;
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 30px 20px;
}

/* ── Selection ── */
::selection {
    background: var(--color-primary);
    color: var(--bg-body);
}

/* ── Scrollbar ── */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-body);
}

::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}