:root {
    --bg-color: #0f1115;
    --panel-bg: #1a1d24;
    --text-primary: #f0f2f5;
    --text-secondary: #8b92a5;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --start-color: #10b981;
    --stop-color: #ef4444;
    --border-color: #2d3342;
    --font-main: 'Inter', sans-serif;
    --font-mono: 'Roboto Mono', monospace;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-main);
    display: flex;
    flex-direction: column;
    height: 100vh;
    height: 100dvh;
    overflow: hidden;
    user-select: none;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    background-color: var(--panel-bg);
    border-bottom: 1px solid var(--border-color);
}

.mode-label {
    font-weight: 800;
    font-size: 1.25rem;
    letter-spacing: 0.1em;
    color: var(--accent-color);
}

#settings-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: color 0.2s, background-color 0.2s;
}

#settings-btn:active {
    background-color: var(--border-color);
    color: var(--text-primary);
}

/* Main Layout */
main {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 1rem;
    gap: 1rem;
}

/* Time Section */
.time-section {
    flex: 1;
    background: linear-gradient(145deg, #1e222a, #15181e);
    border-radius: 1.5rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 1rem;
    border: 1px solid var(--border-color);
    position: relative;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

.time-display {
    font-family: var(--font-mono);
    font-size: 4.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
    text-shadow: 0 0 20px rgba(255,255,255,0.1);
    font-variant-numeric: tabular-nums;
}

.time-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
    width: 100%;
}

.massive-btn {
    flex: 1 1 100%;
    padding: 1.5rem;
    font-size: 1.5rem;
    font-weight: 800;
    border-radius: 1rem;
    border: none;
    color: white;
    cursor: pointer;
    transition: transform 0.1s, opacity 0.2s;
}

.massive-btn:active {
    transform: scale(0.97);
}

.btn-start {
    background-color: var(--start-color);
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.4);
}

.btn-stop {
    background-color: var(--stop-color);
    box-shadow: 0 4px 15px rgba(239, 68, 68, 0.4);
}

.btn-undo {
    background-color: #f59e0b;
    color: white;
    border: none;
    padding: 1rem;
    border-radius: 0.75rem;
    font-weight: 700;
    flex: 1 1 45%;
}

.btn-reset {
    background-color: var(--panel-bg);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    padding: 1rem;
    border-radius: 0.75rem;
    font-weight: 700;
    flex: 1 1 45%;
}

/* Tally Section */
.tally-section {
    flex: 1.2;
    background: linear-gradient(145deg, #1e222a, #15181e);
    border-radius: 1.5rem;
    display: flex;
    flex-direction: column;
    padding: 1rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

.tally-display-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding: 0 1rem;
}

.tally-label {
    font-weight: 700;
    color: var(--text-secondary);
    letter-spacing: 0.1em;
}

.tally-display {
    font-family: var(--font-mono);
    font-size: 3rem;
    font-weight: 700;
}

.tally-controls {
    display: flex;
    flex: 1;
    gap: 1rem;
    margin-bottom: 1rem;
}

.btn-tally-inc, .btn-tally-dec {
    border: none;
    border-radius: 1rem;
    color: white;
    font-size: 3rem;
    font-weight: 400;
    cursor: pointer;
    transition: transform 0.1s, filter 0.2s;
}

.btn-tally-inc:active, .btn-tally-dec:active {
    transform: scale(0.97);
}

/* Handedness specific layouts */
.right-handed .tally-controls {
    flex-direction: row;
}
.right-handed .btn-tally-dec {
    flex: 1;
    background-color: #374151;
}
.right-handed .btn-tally-inc {
    flex: 3;
    background-color: var(--accent-color);
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
}

.left-handed .tally-controls {
    flex-direction: row-reverse;
}
.left-handed .btn-tally-dec {
    flex: 1;
    background-color: #374151;
}
.left-handed .btn-tally-inc {
    flex: 3;
    background-color: var(--accent-color);
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
}

.btn-reset-tally {
    background-color: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    padding: 1rem;
    border-radius: 0.75rem;
    font-weight: 700;
    width: 100%;
}

/* Overlays */
#lead-in-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(15, 17, 21, 0.95);
    z-index: 100;
    display: flex;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(10px);
}

#lead-in-text {
    font-size: 15rem;
    font-family: var(--font-mono);
    font-weight: 800;
    color: var(--accent-color);
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0% { transform: scale(0.9); opacity: 0.8; }
    50% { transform: scale(1.1); opacity: 1; }
    100% { transform: scale(0.9); opacity: 0.8; }
}

#settings-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0,0,0,0.6);
    z-index: 50;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1rem;
    backdrop-filter: blur(5px);
}

.settings-modal {
    background-color: var(--panel-bg);
    width: 100%;
    max-width: 400px;
    border-radius: 1.5rem;
    padding: 2rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.settings-modal h2 {
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

.setting-group {
    margin-bottom: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.setting-group label {
    font-weight: 600;
    color: var(--text-secondary);
}

select {
    width: 100%;
    padding: 1rem;
    background-color: var(--bg-color);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    font-size: 1rem;
    appearance: none;
    outline: none;
}

select:focus {
    border-color: var(--accent-color);
}

.btn-primary {
    width: 100%;
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 1rem;
    border-radius: 0.75rem;
    font-weight: 700;
    font-size: 1.1rem;
    margin-top: 1rem;
}

/* Utilities */
.hidden {
    display: none !important;
}