* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #8b5cf6;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --success-color: #10b981;
    --bg-dark: #0f172a;
    --bg-card: #1e293b;
    --bg-card-hover: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border-color: #334155;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
    color: var(--text-primary);
    min-height: 100vh;
    padding: 2rem 1rem;
    position: relative;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.1) 0%, transparent 50%);
    animation: rotate 30s linear infinite;
    pointer-events: none;
    z-index: 0;
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

.container {
    max-width: 600px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

header {
    text-align: center;
    margin-bottom: 3rem;
    animation: fadeInDown 0.6s ease-out;
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.main-title {
    font-size: 3rem;
    font-weight: 700;
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #ec4899 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    font-weight: 300;
}

.tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2rem;
    background: var(--bg-card);
    padding: 0.5rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-sm);
    animation: fadeIn 0.6s ease-out 0.2s both;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.tab-btn {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 1rem;
    border-radius: 0.75rem;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.tab-icon {
    font-size: 1.5rem;
    transition: transform 0.3s ease;
}

.tab-btn:hover {
    background: rgba(99, 102, 241, 0.1);
    color: var(--text-primary);
}

.tab-btn:hover .tab-icon {
    transform: scale(1.2);
}

.tab-btn.active {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    box-shadow: var(--shadow-md);
}

.tab-content {
    display: none;
    animation: fadeInUp 0.4s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.tab-content.active {
    display: block;
}

.tool-card {
    background: var(--bg-card);
    border-radius: 1.5rem;
    padding: 2.5rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
}

.tool-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 2rem;
    text-align: center;
    color: var(--text-primary);
}

.current-time {
    font-size: 3rem;
    font-weight: 300;
    text-align: center;
    margin-bottom: 2rem;
    color: var(--primary-color);
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.05em;
}

.display {
    font-size: 4rem;
    font-weight: 300;
    text-align: center;
    margin-bottom: 2rem;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.05em;
    text-shadow: 0 0 20px rgba(99, 102, 241, 0.3);
}

.input-group {
    margin-bottom: 1.5rem;
}

.input-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

.time-input,
.number-input {
    width: 100%;
    padding: 1rem;
    background: var(--bg-dark);
    border: 2px solid var(--border-color);
    border-radius: 0.75rem;
    color: var(--text-primary);
    font-size: 1.1rem;
    font-family: inherit;
    transition: all 0.3s ease;
}

.time-input:focus,
.number-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.timer-inputs {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 2rem;
}

.btn {
    padding: 1rem 2rem;
    border: none;
    border-radius: 0.75rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: inherit;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:active::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background: var(--bg-dark);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--bg-card-hover);
    border-color: var(--primary-color);
}

.btn-secondary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-danger {
    background: var(--danger-color);
    color: white;
}

.btn-danger:hover {
    background: #dc2626;
    transform: translateY(-2px);
}

.btn-warning {
    background: var(--warning-color);
    color: white;
}

.btn-warning:hover:not(:disabled) {
    background: #d97706;
    transform: translateY(-2px);
}

.btn-warning:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-group {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.btn-group .btn {
    flex: 1;
    min-width: 120px;
}

.alarm-list {
    margin-top: 2rem;
}

.alarm-item {
    background: var(--bg-dark);
    padding: 1rem 1.5rem;
    border-radius: 0.75rem;
    margin-bottom: 0.75rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 2px solid var(--border-color);
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.alarm-item.active {
    border-color: var(--success-color);
    background: rgba(16, 185, 129, 0.1);
}

.alarm-time {
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.alarm-delete {
    background: var(--danger-color);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.3s ease;
}

.alarm-delete:hover {
    background: #dc2626;
    transform: scale(1.05);
}

.laps-container {
    margin-top: 2rem;
    max-height: 300px;
    overflow-y: auto;
}

.laps-container::-webkit-scrollbar {
    width: 8px;
}

.laps-container::-webkit-scrollbar-track {
    background: var(--bg-dark);
    border-radius: 4px;
}

.laps-container::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

.lap-item {
    background: var(--bg-dark);
    padding: 1rem 1.5rem;
    border-radius: 0.75rem;
    margin-bottom: 0.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 1px solid var(--border-color);
    animation: slideIn 0.3s ease-out;
}

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

.lap-times {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 0.25rem;
}

.lap-time {
    font-size: 1.2rem;
    font-weight: 500;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
}

.lap-diff {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--warning-color);
    font-variant-numeric: tabular-nums;
}

@media (max-width: 640px) {
    .main-title {
        font-size: 2rem;
    }

    .tool-card {
        padding: 1.5rem;
    }

    .display {
        font-size: 2.5rem;
    }

    .current-time {
        font-size: 2rem;
    }

    .timer-inputs {
        grid-template-columns: 1fr;
    }

    .btn-group {
        flex-direction: column;
    }

    .btn-group .btn {
        width: 100%;
    }

    .tab-btn {
        font-size: 0.9rem;
        padding: 0.75rem;
    }

    .tab-icon {
        font-size: 1.2rem;
    }
}