@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600&family=Space+Grotesk:wght@300;400;500;600;700&display=swap');

:root {
    --bg-color: #08090c;
    --card-bg: rgba(255, 255, 255, 0.03);
    --card-border: rgba(255, 255, 255, 0.06);
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-muted: #4b5563;
    --accent: #6366f1;
    --accent-glow: rgba(99, 102, 241, 0.15);
    --accent-hover: #4f46e5;
    --danger: #ef4444;
    --danger-glow: rgba(239, 68, 68, 0.15);
    --success: #10b981;
    --font-sans: 'Plus Jakarta Sans', sans-serif;
    --font-mono: 'Space Grotesk', monospace;
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --ring-size: 280px;
}

[data-theme="light"] {
    --bg-color: #f8fafc;
    --card-bg: rgba(0, 0, 0, 0.02);
    --card-border: rgba(0, 0, 0, 0.06);
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --accent: #4f46e5;
    --accent-glow: rgba(79, 70, 229, 0.1);
    --accent-hover: #3730a3;
    --danger: #dc2626;
    --danger-glow: rgba(220, 38, 38, 0.1);
    --success: #059669;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-sans);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    overflow-x: hidden;
    transition: var(--transition-smooth);
    padding: 2rem;
}

/* Subtle background glow removed */

header {
    width: 100%;
    max-width: 600px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 10;
}

.logo {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: -0.05em;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.top-controls {
    display: flex;
    gap: 0.75rem;
}

.icon-btn {
    background: transparent;
    border: 1px solid var(--card-border);
    background-color: var(--card-bg);
    color: var(--text-secondary);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.icon-btn:hover {
    color: var(--text-primary);
    border-color: var(--text-secondary);
    transform: translateY(-1px);
}

.icon-btn svg {
    width: 20px;
    height: 20px;
    fill: currentColor;
}

main {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 100%;
    max-width: 600px;
    padding: 2rem 0;
    position: relative;
}

/* Nav tabs */
.nav-tabs {
    display: flex;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    padding: 0.25rem;
    border-radius: 30px;
    margin-bottom: 3.5rem;
    backdrop-filter: blur(10px);
}

.tab-btn {
    background: transparent;
    border: none;
    padding: 0.5rem 1.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: 20px;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.tab-btn.active {
    background: var(--text-primary);
    color: var(--bg-color);
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

/* Display Containers */
.display-wrapper {
    position: relative;
    width: var(--ring-size);
    height: var(--ring-size);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin-bottom: 3rem;
}

/* Visual Progress Ring */
.progress-ring {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
    transition: var(--transition-smooth);
}

.progress-ring.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.progress-ring__circle {
    transition: stroke-dashoffset 0.3s ease-out;
    transform-origin: 50% 50%;
}

/* Time display typography */
.time-display {
    font-family: var(--font-mono);
    font-size: 3.75rem;
    font-weight: 400;
    letter-spacing: -0.02em;
    font-variant-numeric: tabular-nums;
    text-align: center;
    position: relative;
    z-index: 2;
    line-height: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.milliseconds {
    font-size: 1.5rem;
    color: var(--text-secondary);
    font-weight: 300;
    margin-top: 0.25rem;
}

.sub-info {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

/* Controls Panel */
.controls-container {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 160px;
}

.panel {
    display: none;
    flex-direction: column;
    align-items: center;
    width: 100%;
    animation: fadeIn 0.4s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.panel.active {
    display: flex;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Button layouts */
.button-group {
    display: flex;
    gap: 1rem;
    justify-content: center;
    align-items: center;
    margin-top: 1.5rem;
}

/* Action buttons */
.btn {
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 0.95rem;
    padding: 0.75rem 1.75rem;
    border-radius: 25px;
    border: none;
    cursor: pointer;
    transition: var(--transition-smooth);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-primary {
    background-color: var(--text-primary);
    color: var(--bg-color);
}

.btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: var(--card-bg);
    color: var(--text-primary);
    border: 1px solid var(--card-border);
}

.btn-secondary:hover {
    background-color: var(--card-border);
    transform: translateY(-1px);
}

.btn-danger {
    background-color: var(--danger-glow);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.btn-danger:hover {
    background-color: var(--danger);
    color: white;
    transform: translateY(-1px);
}

/* Input Fields and Selectors */
.timer-setup {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.25rem;
    width: 100%;
}

.time-inputs {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.input-unit-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.input-unit-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 0.05em;
}

.time-input {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 2.25rem;
    width: 80px;
    height: 70px;
    text-align: center;
    border-radius: 16px;
    outline: none;
    transition: var(--transition-smooth);
}

.time-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

/* Hide spin buttons */
.time-input::-webkit-outer-spin-button,
.time-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}
.time-input[type=number] {
    -moz-appearance: textfield;
}

.colon-divider {
    font-family: var(--font-mono);
    font-size: 2rem;
    color: var(--text-muted);
    font-weight: 300;
    margin-bottom: 1.25rem; /* align visually with inputs */
}

/* Presets */
.presets-list {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: center;
}

.preset-btn {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    color: var(--text-secondary);
    padding: 0.4rem 1rem;
    font-size: 0.8rem;
    font-weight: 500;
    border-radius: 15px;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.preset-btn:hover {
    color: var(--text-primary);
    border-color: var(--text-secondary);
}

/* Laps List */
.laps-container {
    width: 100%;
    max-height: 120px;
    overflow-y: auto;
    margin-top: 1.5rem;
    padding-right: 0.25rem;
}

.laps-container::-webkit-scrollbar {
    width: 4px;
}
.laps-container::-webkit-scrollbar-track {
    background: transparent;
}
.laps-container::-webkit-scrollbar-thumb {
    background: var(--card-border);
    border-radius: 2px;
}

.lap-item {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0.75rem;
    border-bottom: 1px solid var(--card-border);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.lap-number {
    font-weight: 600;
    color: var(--text-muted);
}

.lap-time {
    font-family: var(--font-mono);
}

/* Hotkey reminder */
.hotkey-hint {
    margin-top: auto;
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: center;
    opacity: 0.7;
    transition: var(--transition-smooth);
}

/* Screen glow for countdown end */
@keyframes completion-pulse {
    0% {
        box-shadow: inset 0 0 100px rgba(16, 185, 129, 0.1);
    }
    50% {
        box-shadow: inset 0 0 150px rgba(16, 185, 129, 0.25);
    }
    100% {
        box-shadow: inset 0 0 100px rgba(16, 185, 129, 0.1);
    }
}

.timer-completed-state {
    animation: completion-pulse 2s infinite ease-in-out;
}

/* Responsive adjustment */
@media (max-width: 480px) {
    :root {
        --ring-size: 240px;
    }
    body {
        padding: 1rem;
    }
    .time-display {
        font-size: 3rem;
    }
}