/* === BASE (UNIFIED) === */

:root {
    /* Color System */
    --color-primary: #12137F;
    --color-primary-dark: #090a57;
    --color-accent: hsl(30, 100%, 55%);
    --color-success: hsl(145, 63%, 42%);
    --color-danger: hsl(0, 79%, 63%);
    --color-warning: hsl(45, 100%, 51%);

    --color-text-primary: hsl(215, 28%, 17%);
    --color-text-secondary: hsl(215, 16%, 47%);
    --color-text-on-dark: hsl(210, 17%, 98%);

    --color-surface: hsl(0, 0%, 100%);
    --color-surface-soft: hsl(220, 33%, 97%);
    --color-border: hsl(220, 25%, 92%);

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;

    /* Sizing & Spacing */
    --space-unit: 1rem;
    --border-radius-soft: 12px;
    --border-radius-hard: 6px;

    /* Effects */
    --shadow-subtle: 0 2px 8px hsla(215, 28%, 17%, 0.06);
    --shadow-medium: 0 4px 16px hsla(215, 28%, 17%, 0.08);
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --bg: #fff;
    --text: #222;
    --card-bg: #f8f9fa;
    --primary: #12137F;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    margin: 0;
    line-height: 1.65;
    color: var(--color-text-primary);
    background-color: var(--color-surface);
    background: var(--bg);
    color: var(--text);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
}

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

img,
video {
    max-width: 100%;
    height: auto;
    display: block;
}

.main-content-wrapper {
    margin-top: 68px;
    /* Space for fixed header */
    padding: 2rem 0;
    /* Add some default padding */
}

.container {
    width: 100%;
    max-width: 1600px;
    /* Tăng chiều rộng tối đa để layout rộng hơn */
    margin-left: auto;
    margin-right: auto;
    padding: 0 1.5rem;
}

@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }
}

/* Thêm vào trong thẻ body của file base.css */
body {
    font-family: var(--font-primary);
    margin: 0;
    line-height: 1.65;
    color: var(--color-text-primary);
    background-color: var(--color-surface-soft);
    /* Màu nền xám rất nhạt, sạch sẽ */
}

@keyframes background-pan {
    0% {
        background-position: 0% 50%;
    }

    50% {
        background-position: 100% 50%;
    }

    100% {
        background-position: 0% 50%;
    }
}

body.dark-mode {
    --bg: #181a1b;
    --text: #e0e0e0;
    --card-bg: #23272a;
    --primary: #5c6bc0;
    background: var(--bg);
    color: var(--text);
}

body,
.test-card,
.main-content-wrapper,
.container {
    color: var(--text);
}

.test-card {
    background: var(--card-bg);
}

/* === END OF BASE (UNIFIED) === */