/* --- GLOBAL STYLES & THEME VARIABLES --- */
:root {
    --bg-color: #f4f7f9;
    --card-color: #ffffff;
    --text-color: #2c3e50;
    --label-color: #7f8c8d;
    --border-color: #bdc3c7;
    --accent-primary: #3498db;
    --accent-secondary: #e74c3c;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --input-bg: #ecf0f1;
}

[data-theme="dark"] {
    --bg-color: #1a1a2e;
    --card-color: #16213e;
    --text-color: #e0e0e0;
    --label-color: #a0a0a0;
    --border-color: #0f3460;
    --accent-primary: #5372f0;
    --accent-secondary: #e94560;
    --shadow-color: rgba(0, 0, 0, 0.4);
    --input-bg: #0f3460;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* --- HEADER & THEME TOGGLE --- */
.page-header {
    text-align: center;
    margin-bottom: 40px;
}
.page-header h1 {
    color: var(--accent-secondary);
    cursor: pointer;
    user-select: none;
}
.theme-switcher {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    margin-top: 15px;
}
.toggle-checkbox { display: none; }
.toggle-label {
    width: 50px; height: 26px;
    background: #ccc;
    border-radius: 13px;
    display: block;
    position: relative;
    cursor: pointer;
    transition: background-color 0.2s;
}
.toggle-label::after {
    content: '';
    width: 22px; height: 22px;
    background: white;
    border-radius: 50%;
    position: absolute;
    top: 2px; left: 2px;
    transition: transform 0.2s;
}
.toggle-checkbox:checked + .toggle-label { background: var(--accent-primary); }
.toggle-checkbox:checked + .toggle-label::after { transform: translateX(24px); }


/* --- LAYOUT & CARD STYLES --- */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 25px;
    max-width: 1600px;
    margin: 0 auto;
}
.tool-card {
    background-color: var(--card-color);
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 5px 20px var(--shadow-color);
    border: 1px solid var(--border-color);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}
.tool-card h2 {
    margin-top: 0;
    color: var(--accent-secondary);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 10px;
}

/* --- GENERAL UI ELEMENTS --- */
.input-group {
    display: flex; align-items: center; gap: 10px; margin-bottom: 15px;
}
.input-group label { flex-basis: 40px; color: var(--label-color); font-weight: bold; }
.input-group input[type="text"] {
    flex-grow: 1; background-color: var(--input-bg);
    border: 1px solid var(--border-color); color: var(--text-color);
    padding: 10px; border-radius: 5px; font-size: 1rem;
}
input[type="color"] {
    min-width: 50px; height: 50px; border: none; padding: 0;
    background: none; cursor: pointer; border-radius: 8px; -webkit-appearance: none;
}
input[type="color"]::-webkit-color-swatch-wrapper { padding: 0; }
input[type="color"]::-webkit-color-swatch { border: 2px solid var(--label-color); border-radius: 8px; }

.action-btn, .copy-btn {
    background-color: var(--accent-primary); color: white; border: none;
    padding: 10px 15px; border-radius: 5px; cursor: pointer; font-weight: bold;
    transition: background-color 0.2s, transform 0.1s; width: 100%; margin-top: 10px;
}
.action-btn.secondary { background-color: var(--label-color); }
.action-btn:hover, .copy-btn:hover { filter: brightness(1.1); }
.action-btn:active, .copy-btn:active { transform: scale(0.98); }
.copy-btn { width: auto; margin-top: 0; }

.hidden { display: none !important; }
.slider { width: 100%; -webkit-appearance: none; height: 8px; background: var(--border-color); border-radius: 4px; outline: none; }
.slider::-webkit-slider-thumb { -webkit-appearance: none; appearance: none; width: 20px; height: 20px; background: var(--accent-primary); cursor: pointer; border-radius: 50%; }

/* --- SPECIFIC TOOL STYLES --- */
/* Color Picker */
.picker-layout { display: flex; align-items: center; gap: 20px; margin-bottom: 20px; }
.color-preview { width: 100%; height: 70px; border-radius: 8px; border: 2px solid var(--border-color); }

/* Gradient Generator */
.gradient-controls { display: flex; align-items: center; gap: 10px; margin-bottom: 15px; }
.gradient-controls select, .gradient-controls input[type="number"] {
    background-color: var(--input-bg); border: 1px solid var(--border-color);
    color: var(--text-color); padding: 8px; border-radius: 5px;
}
#gradient-stops { margin: 15px 0; }
.color-stop { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
.color-stop input[type="range"] { flex-grow: 1; }
.color-stop button { background: var(--accent-secondary); border: none; color: white; border-radius: 50%; width: 25px; height: 25px; cursor: pointer; }
.gradient-preview-box { width: 100%; height: 120px; border-radius: 8px; margin: 15px 0; border: 2px solid var(--border-color); }
.output-group { display: flex; gap: 10px; margin-top: 15px; }
.output-group textarea { flex-grow: 1; background: var(--input-bg); color: var(--text-color); border-radius: 5px; padding: 10px; resize: none; border-color: var(--border-color); }

/* Color Mixer */
.mixer-interface { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
.mixer-result { text-align: center; }
#mixer-preview { width: 80px; height: 80px; border-radius: 50%; margin-bottom: 10px; border: 2px solid var(--border-color); }
.mixer-labels { display: flex; justify-content: space-between; font-size: 0.8em; color: var(--label-color); }

/* Palette Generator */
.palette-controls { display: flex; gap: 15px; align-items: center; margin-bottom: 20px; }
#palette-rule { flex-grow: 1; background: var(--input-bg); border: 1px solid var(--border-color); color: var(--text-color); padding: 8px; border-radius: 5px; }
.palette-container { display: grid; grid-template-columns: repeat(auto-fill, minmax(80px, 1fr)); gap: 10px; }
.palette-swatch { height: 80px; border-radius: 8px; display: flex; justify-content: center; align-items: flex-end; padding-bottom: 5px; color: white; text-shadow: 1px 1px 2px black; font-size: 0.8em; cursor: pointer; transition: transform 0.2s; }
.palette-swatch:hover { transform: scale(1.05); }

/* Contrast Checker */
.contrast-interface { display: flex; justify-content: space-around; gap: 15px; margin-bottom: 15px; }
.contrast-input { text-align: center; }
#contrast-preview { padding: 20px; text-align: center; font-size: 1.5em; font-weight: bold; border-radius: 8px; margin-bottom: 15px; }
.status-box { display: flex; justify-content: space-around; background-color: var(--input-bg); padding: 10px; border-radius: 5px; }
.pass { color: #2ecc71; }
.fail { color: #e74c3c; }

/* Secret Sections */
#secret-info-section { max-width: 800px; margin: 40px auto; }
#secret-info-section details { background: var(--input-bg); border-radius: 5px; padding: 10px; margin-bottom: 10px; }
#secret-info-section summary { font-weight: bold; cursor: pointer; }
#secret-disco {
    position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%);
    background: rgba(0, 0, 0, 0.8); padding: 40px; border-radius: 15px;
    text-align: center; border: 2px solid var(--accent-secondary); z-index: 1000;
}
#stop-disco-btn { background: white; color: black; }