/* ==========================================
   1. Design Variables & Themes
   ========================================== */
:root[data-theme="dark"] {
    --bg-color: #0d1117;
    --card-bg: #161b22;
    --border-color: #30363d;
    --text-main: #c9d1d9;
    --text-muted: #8b949e;
    --accent-color: #ff7b72; 
    --accent-secondary: #58a6ff; 
    --terminal-bg: #010409;
    --shadow: rgba(0, 0, 0, 0.4);
}

:root[data-theme="light"] {
    --bg-color: #f8f9fa;
    --card-bg: #ffffff;
    --border-color: #d0d7de;
    --text-main: #24292f;
    --text-muted: #57606a;
    --accent-color: #d9381e; 
    --accent-secondary: #0969da;
    --terminal-bg: #1f2428;
    --shadow: rgba(0, 0, 0, 0.08);
}

/* ==========================================
   2. Base Rules
   ========================================== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    transition: background-color 0.25s ease, border-color 0.25s ease, color 0.25s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
}

a {
    color: var(--accent-secondary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* ==========================================
   3. Layout Structure
   ========================================== */
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 40px;
}

.logo {
    font-size: 1.3rem;
    font-weight: 700;
}

.logo span {
    color: var(--accent-color);
}

nav {
    display: flex;
    gap: 20px;
    align-items: center;
}

.nav-link {
    font-weight: 500;
    color: var(--text-muted);
}

.nav-link:hover {
    color: var(--text-main);
}

/* ==========================================
   4. UI Components (Buttons, Badges, Cards)
   ========================================== */
.theme-toggle {
    background: none;
    border: 1px solid var(--border-color);
    padding: 6px 12px;
    border-radius: 20px;
    cursor: pointer;
    color: var(--text-main);
    font-size: 0.85rem;
}

.theme-toggle:hover {
    background-color: var(--card-bg);
}

.hero {
    margin-bottom: 40px;
}

.hero h1 {
    font-size: 2.2rem;
    margin-bottom: 12px;
}

.hero p {
    font-size: 1.1rem;
    color: var(--text-muted);
    max-width: 650px;
}

.badge-container {
    margin-top: 15px;
}

.badge {
    display: inline-block;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 0.8rem;
    margin-right: 8px;
    margin-top: 8px;
}

/* ==========================================
   5. Interactive Terminal Styles
   ========================================== */
.terminal-container {
    background-color: var(--terminal-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    box-shadow: 0 10px 20px var(--shadow);
    margin-bottom: 45px;
    font-family: Consolas, "Liberation Mono", Menlo, monospace;
    overflow: hidden;
}

.terminal-header {
    background-color: var(--card-bg);
    padding: 10px 15px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.terminal-buttons {
    display: flex;
    gap: 6px;
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.dot.red { background-color: #ff5f56; }
.dot.yellow { background-color: #ffbd2e; }
.dot.green { background-color: #27c93f; }

.terminal-title {
    margin-left: 15px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.terminal-body {
    padding: 15px;
    height: 200px;
    overflow-y: auto;
    color: #39ff14; /* Matrix Green styling */
    font-size: 0.85rem;
}

.terminal-line {
    margin-bottom: 6px;
}

.terminal-input-line {
    display: flex;
    align-items: center;
}

.terminal-prompt {
    color: var(--accent-secondary);
    margin-right: 8px;
}

.terminal-input {
    background: none;
    border: none;
    color: #39ff14;
    font-family: inherit;
    font-size: inherit;
    outline: none;
    width: 100%;
}

/* ==========================================
   6. Sections and Media Grid
   ========================================== */
.section-title {
    font-size: 1.4rem;
    margin-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 6px;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
    margin-bottom: 45px;
}

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 20px;
    box-shadow: 0 4px 8px var(--shadow);
}

.card h3 {
    margin-bottom: 8px;
    color: var(--text-main);
}

.card p {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 15px;
}

.github-link {
    font-size: 0.9rem;
    font-weight: bold;
}

.video-container {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    border-radius: 4px;
    margin-top: 10px;
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

.meta-info {
    font-size: 0.8rem;
    color: var(--accent-color);
    margin-bottom: 8px;
    font-family: monospace;
}

/* ==========================================
   7. Footer
   ========================================== */
footer {
    text-align: center;
    padding: 30px 0;
    color: var(--text-muted);
    border-top: 1px solid var(--border-color);
    font-size: 0.85rem;
}

/* Responsive collapse on tiny mobile interfaces */
@media (max-width: 500px) {
    header {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }
}