/* --- Root & Theme Variables --- */
:root {
    --shadow-color: rgba(0, 0, 0, 0.2);
}

/* Default Dark Theme */
[data-theme="dark"] {
    --bg: #1a1a1a;
    --text: #e0e0e0;
    --accent: #7f5af0;
    --accent-secondary: #2cb67d;
    --progress-bg: #2d2d2d;
    --card-bg: #252525;
    --border-color: #333;
}

/* Light Theme */
[data-theme="light"] {
    --bg: #f4f4f5;
    --text: #18181b;
    --accent: #6d28d9;
    --accent-secondary: #059669;
    --progress-bg: #e4e4e7;
    --card-bg: #ffffff;
    --border-color: #d4d4d8;
}

/* Ocean Theme */
[data-theme="ocean"] {
    --bg: #0f172a;
    --text: #cbd5e1;
    --accent: #38bdf8;
    --accent-secondary: #34d399;
    --progress-bg: #1e293b;
    --card-bg: #1e293b;
    --border-color: #334155;
}

/* --- Base Styles --- */
body {
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    padding: 20px;
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    padding-bottom: 60px; /* Space for dev controls */
}

/* --- Hero Section --- */
.hero {
    text-align: center;
    margin-bottom: 2rem;
}

.current-time {
    font-size: clamp(48px, 10vw, 72px);
    font-weight: bold;
    color: var(--accent);
    font-family: 'SF Mono', 'Consolas', 'Menlo', monospace;
    letter-spacing: -2px;
}

#hero-info {
    font-size: clamp(16px, 4vw, 24px);
    margin: 10px 0;
    font-family: 'SF Mono', 'Consolas', 'Menlo', monospace;
    min-height: 1.2em;
}

/* --- Statistics Grid --- */
.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: 0 4px 12px var(--shadow-color);
    transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.3s;
}

.stat-card h3 {
    margin-top: 0;
    color: var(--accent);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.75rem;
    margin-bottom: 1rem;
}

.progress-bar, .time-units, .unit-box, .schedule-list, .lesson-item {
    /* Shared properties */
    background-color: var(--card-bg-props, transparent); /* Fallback */
}
.progress-bar { background: var(--progress-bg); }
.time-units { margin-top: 1rem; display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; }
.unit-box { background: rgba(127, 127, 127, 0.1); padding: 8px; border-radius: 6px; text-align: center; }
.unit-label { font-size: 0.8em; opacity: 0.7; margin-bottom: 4px; text-transform: uppercase; }
.unit-value { font-family: 'SF Mono', 'Consolas', 'Menlo', monospace; font-size: 1.1em; font-weight: bold; }
.progress-fill { background: linear-gradient(90deg, var(--accent), var(--accent-secondary)); height: 100%; width: 0; transition: width 0.4s ease-out; }

/* --- Schedule List --- */
.schedule-list { background: var(--card-bg); padding: 1rem; border-radius: 12px; box-shadow: 0 4px 12px var(--shadow-color); }
.lesson-item { padding: 12px 10px; border-bottom: 1px solid var(--border-color); display: flex; align-items: center; gap: 10px; transition: background-color 0.2s ease; font-family: 'SF Mono', 'Consolas', 'Menlo', monospace; }
.lesson-item:last-child { border-bottom: none; }
.lesson-item:hover { background-color: rgba(127, 127, 127, 0.05); }
.lesson-item.ghost { opacity: 0.4; text-decoration: line-through; }

/* Checkbox */
.checkbox-container { display: flex; align-items: center; gap: 8px; cursor: pointer; width: 100%; }
.checkbox-custom { width: 18px; height: 18px; border: 2px solid var(--accent); border-radius: 4px; position: relative; transition: all 0.2s; flex-shrink: 0; }
.checkbox-custom::after { content: "✓"; font-size: 18px; position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%) scale(0); color: var(--accent-secondary); transition: transform 0.2s ease; }
input:checked + .checkbox-custom::after { transform: translate(-50%, -50%) scale(1); }
input[type="checkbox"] { display: none; }

/* --- Dev Controls --- */
.dev-controls {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--card-bg);
    padding: 8px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 20px rgba(0,0,0,0.4);
    display: flex;
    align-items: center;
    gap: 8px;
    z-index: 100;
}

.dev-group {
    display: flex;
    gap: 8px;
}

.dev-divider {
    width: 1px;
    height: 24px;
    background-color: var(--border-color);
}

.dev-controls button {
    background: var(--progress-bg);
    border: 1px solid var(--border-color);
    color: var(--text);
    font-family: monospace;
    font-size: 16px;
    padding: 8px 12px;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.2s, color 0.2s;
}
.dev-controls button:hover { 
    background-color: var(--accent); 
    color: white;
    border-color: var(--accent);
}
.dev-controls button.active {
    background-color: var(--accent-secondary);
    color: white;
    border-color: var(--accent-secondary);
}
.dev-controls button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background-color: var(--progress-bg);
    color: var(--text);
    border-color: var(--border-color);
}

/* --- Settings Page Styles --- */
.window-controls {
    position: absolute;
    top: 10px;
    right: 10px;
    display: flex;
    gap: 8px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 6px 12px;
    box-shadow: 0 2px 8px var(--shadow-color);
}

.back-button {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: var(--progress-bg);
    border-radius: 6px;
    color: var(--text);
    text-decoration: none;
    font-size: 14px;
    transition: all 0.2s ease;
    border: 1px solid var(--border-color);
}

.back-button:hover {
    background: var(--accent);
    color: white;
    transform: translateY(-1px);
}

.back-arrow {
    font-weight: bold;
    font-size: 16px;
}

.settings-btn { 
    position: relative;
    top: auto;
    right: auto;
    background: var(--progress-bg);
    color: var(--text); 
    border: 1px solid var(--border-color); 
    border-radius: 6px; 
    width: 32px; 
    height: 32px; 
    font-size: 16px; 
    cursor: pointer; 
    display: flex; 
    align-items: center; 
    justify-content: center; 
    transition: all 0.2s ease; 
    text-decoration: none; 
}
.settings-btn:hover { background-color: var(--progress-bg); transform: rotate(45deg); }
.settings-container { max-width: 900px; margin: 0 auto; }
.settings-header { display: flex; justify-content: space-between; align-items: flex-start; padding-bottom: 1rem; margin-bottom: 1.5rem; border-bottom: 1px solid var(--border-color); }
.settings-header h1 { color: var(--accent); margin: 0; }
.back-btn { color: var(--text); text-decoration: none; background-color: var(--card-bg); padding: 0.5rem 1rem; border-radius: 8px; border: 1px solid var(--border-color); transition: background-color 0.2s; display: inline-block; margin-top: 8px;}
.back-btn:hover { background-color: var(--progress-bg); }
.reset-all-btn { color: #f87171; background-color: transparent; border: 1px solid #f87171; padding: 0.5rem 1rem; border-radius: 8px; cursor: pointer; transition: background-color 0.2s, color 0.2s; }
.reset-all-btn:hover { background-color: #f87171; color: white; }
.settings-section { background: var(--card-bg); padding: 1.5rem; border-radius: 8px; margin-bottom: 1.5rem; }
.settings-section h3 { margin-top: 0; display: flex; justify-content: space-between; align-items: center; }
.settings-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 1.5rem; margin-top: 1rem; }
.setting-item { display: flex; flex-direction: column; gap: 0.5rem; }
.setting-item label { font-size: 0.9em; opacity: 0.8; }
.setting-item input, .setting-item select { background: var(--progress-bg); border: 1px solid var(--border-color); color: var(--text); padding: 8px; border-radius: 4px; width: 100%; box-sizing: border-box; }
.setting-row { display: flex; align-items: center; gap: 8px; }
.setting-row > *:first-child { flex-grow: 1; }
.reset-btn { background: none; border: 1px solid var(--border-color); color: var(--text); opacity: 0.6; border-radius: 50%; width: 28px; height: 28px; cursor: pointer; transition: all 0.2s; flex-shrink: 0; }
.reset-btn:hover { opacity: 1; background-color: var(--progress-bg); transform: rotate(-90deg); }
.color-picker-item { flex-direction: row; align-items: center; gap: 1rem; }
.color-picker-item input[type="color"] { width: 50px; height: 30px; padding: 2px; border: none; border-radius: 4px; background: none; cursor: pointer; }
.color-picker-item span { font-family: monospace; }
.unit-setting { gap: 1rem; }

/* Switch toggle */
.switch { position: relative; display: inline-block; width: 44px; height: 24px; }
.switch input { display: none; }
.slider { position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0; background-color: var(--progress-bg); transition: .4s; border-radius: 24px; }
.slider:before { position: absolute; content: ""; height: 16px; width: 16px; left: 4px; bottom: 4px; background-color: white; transition: .4s; border-radius: 50%; }
input:checked + .slider { background-color: var(--accent); }
input:checked + .slider:before { transform: translateX(20px); }