@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

* {
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: #f0f2f5;
    color: #24292f;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 20px;
    font-size: 14px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.calculator-container {
    background: #fafbfc;
    border: 1px solid #d0d7de;
    border-radius: 16px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    padding: 32px;
    max-width: 680px;
    width: 100%;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 32px;
    padding-bottom: 24px;
    border-bottom: 2px solid #e1e4e8;
    gap: 16px;
}

.header-left {
    flex: 1;
}

.header-right {
    display: flex;
    gap: 12px;
    align-items: center;
}

h1 {
    font-size: 28px;
    font-weight: 600;
    color: #24292f;
    margin: 0 0 8px 0;
    display: flex;
    align-items: center;
    gap: 10px;
    line-height: 1.25;
    letter-spacing: -0.02em;
}

.title-icon {
    stroke: #3b82f6;
    flex-shrink: 0;
}

.github-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 500;
    color: #57606a;
    text-decoration: none;
    transition: all 0.15s;
}

.github-link:hover {
    color: #0969da;
}

.github-link svg {
    display: block;
}

.dark-mode-btn {
    height: 44px;
    width: 44px;
    background: #ffffff;
    border: 1px solid #d0d7de;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.15s;
    padding: 0;
}

.dark-mode-btn:hover {
    background: #f6f8fa;
    border-color: #0969da;
}

.dark-mode-btn svg {
    stroke: #57606a;
    transition: all 0.15s;
}

.dark-mode-btn:hover svg {
    stroke: #0969da;
}

.settings-icon {
    position: relative;
    height: 44px;
    background: #ffffff;
    border: 1px solid #d0d7de;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 0 16px;
    cursor: pointer;
    transition: all 0.15s;
}

.settings-icon:hover {
    background: #f6f8fa;
    border-color: #0969da;
}

.settings-icon svg {
    width: 20px;
    height: 20px;
    stroke: #57606a;
    transition: all 0.15s;
}

.settings-icon:hover svg {
    stroke: #0969da;
    transform: rotate(90deg);
}

.settings-text {
    color: #24292f;
    font-size: 14px;
    font-weight: 600;
}

.settings-icon:hover .settings-text {
    color: #0969da;
}

.custom-badge {
    position: absolute;
    top: -8px;
    right: -8px;
    background: #f59e0b;
    color: #ffffff;
    font-size: 9px;
    font-weight: 600;
    padding: 4px 8px;
    border-radius: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.05); opacity: 0.9; }
}

.hidden {
    display: none !important;
}

/* Modal Styles */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    padding: 20px;
    overflow-y: auto;
    animation: fadeIn 0.2s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-overlay.active {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    overflow-y: auto;
}

.modal-content {
    background: #ffffff;
    border: 1px solid #d0d7de;
    border-radius: 16px;
    padding: 24px;
    max-width: 800px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    animation: slideUp 0.2s ease-out;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.15), 0 10px 10px -5px rgba(0, 0, 0, 0.08);
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 18px;
    padding-bottom: 12px;
    border-bottom: 2px solid #d0d7de;
}

.modal-header h2 {
    font-family: 'Inter', sans-serif;
    font-size: 20px;
    font-weight: 600;
    color: #24292f;
    margin: 0;
    letter-spacing: -0.01em;
}

.close-btn {
    background: #fff1f0;
    border: 1px solid #ffcecb;
    color: #cf222e;
    font-size: 28px;
    width: 36px;
    height: 36px;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    font-weight: 300;
    line-height: 1;
    padding: 0;
}

.close-btn:hover {
    background: #cf222e;
    color: #ffffff;
    border-color: #cf222e;
    transform: scale(1.1);
}

.settings-group {
    margin-bottom: 16px;
}

.settings-group label {
    display: block;
    font-family: 'Inter', sans-serif;
    font-size: 13px;
    font-weight: 600;
    color: #24292f;
    margin-bottom: 6px;
    letter-spacing: -0.01em;
}

.settings-group input[type="number"] {
    width: 100%;
    padding: 10px 12px;
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    color: #24292f;
    background: #ffffff;
    border: 1px solid #d0d7de;
    border-radius: 6px;
    transition: all 0.2s;
}

.settings-group input[type="number"]:focus {
    outline: none;
    border-color: #0969da;
    background: #ffffff;
    box-shadow: 0 0 0 3px rgba(9, 105, 218, 0.1);
}

.settings-description {
    font-size: 11px;
    font-weight: 400;
    color: #57606a;
    margin-top: 4px;
    font-style: normal;
    line-height: 1.3;
}

.validation-error {
    display: none;
    font-size: 12px;
    color: #cf222e;
    margin-top: 6px;
    font-weight: 500;
}

.validation-error.active {
    display: block;
}

.settings-group input.error {
    border-color: #f85149;
    background: rgba(239, 68, 68, 0.05);
}

.preset-section {
    margin-bottom: 16px;
    padding: 14px;
    background: #f6f8fa;
    border-radius: 8px;
    border: 1px solid #d0d7de;
}

.preset-section h3 {
    font-family: 'Inter', sans-serif;
    font-size: 13px;
    font-weight: 600;
    color: #24292f;
    margin: 0 0 8px 0;
    text-transform: none;
    letter-spacing: -0.01em;
}

.preset-controls {
    display: flex;
    gap: 10px;
}

.preset-select {
    flex: 1;
    padding: 10px 12px;
    font-family: 'Inter', sans-serif;
    font-size: 13px;
    color: #24292f;
    background: #ffffff;
    border: 1px solid #d0d7de;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
}

.preset-select:focus {
    outline: none;
    border-color: #0969da;
    box-shadow: 0 0 0 3px rgba(9, 105, 218, 0.1);
}

.preset-btn {
    padding: 10px 18px;
    font-family: 'Inter', sans-serif;
    font-size: 13px;
    font-weight: 500;
    background: #f6f8fa;
    color: #24292f;
    border: 1px solid #d0d7de;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    text-transform: none;
    letter-spacing: normal;
}

.preset-btn:hover {
    background: #0969da;
    color: #ffffff;
    border-color: #0969da;
    transform: translateY(-1px);
}

.preset-btn.danger {
    background: #fff1f0;
    color: #cf222e;
    border-color: #ffcecb;
}

.preset-btn.danger:hover {
    background: #cf222e;
    color: #ffffff;
    border-color: #cf222e;
}

.settings-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
    margin-bottom: 16px;
}

@media (max-width: 600px) {
    .settings-grid {
        grid-template-columns: 1fr;
    }
}

.modal-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
    padding-top: 14px;
    margin-top: 4px;
    border-top: 2px solid #d0d7de;
}

.modal-btn {
    padding: 12px 24px;
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    font-weight: 500;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.15s;
    border: none;
}

.modal-btn.primary {
    background: #0969da;
    color: #ffffff;
}

.modal-btn.primary:hover {
    background: #0550ae;
}

.modal-btn.secondary {
    background: #f6f8fa;
    color: #24292f;
    border: 1px solid #d0d7de;
}

.modal-btn.secondary:hover {
    background: #eaeef2;
    color: #24292f;
    border-color: #afb8c1;
}

/* Import/Export Section */
.import-export-section {
    margin-bottom: 20px;
    padding: 16px;
    background: #f6f8fa;
    border-radius: 8px;
    border: 2px solid #d0d7de;
}

.import-export-section h4 {
    font-family: 'Inter', sans-serif;
    font-size: 13px;
    font-weight: 600;
    color: #24292f;
    margin: 0 0 10px 0;
    text-transform: none;
    letter-spacing: -0.01em;
}

.import-export-controls {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.import-export-controls button {
    flex: 1;
    min-width: 120px;
    padding: 10px 16px;
    font-family: 'Inter', sans-serif;
    font-size: 13px;
    font-weight: 500;
    background: #f6f8fa;
    color: #24292f;
    border: 1px solid #d0d7de;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.import-export-controls button .btn-icon {
    flex-shrink: 0;
}

.import-export-controls button .btn-text {
    min-width: auto;
}

.import-export-controls button:hover {
    background: #0969da;
    color: #ffffff;
    border-color: #0969da;
    transform: translateY(-1px);
}

#import-file-input {
    display: none;
}

/* Save Preset Modal */
.save-preset-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(8px);
    z-index: 1100;
    align-items: center;
    justify-content: center;
}

.save-preset-modal.active {
    display: flex;
}

.save-preset-content {
    background: rgba(26, 31, 46, 0.98);
    border: 1px solid rgba(88, 166, 255, 0.3);
    border-radius: 12px;
    padding: 25px;
    max-width: 400px;
    width: 90%;
    animation: slideUp 0.3s ease-out;
}

.save-preset-content h3 {
    font-family: 'Inter', sans-serif;
    font-size: 18px;
    font-weight: 600;
    color: #3b82f6;
    margin: 0 0 15px 0;
}

.save-preset-content input {
    width: 100%;
    padding: 12px 14px;
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    color: #1a1a1a;
    background: #f3f4f6;
    border: 1px solid rgba(88, 166, 255, 0.25);
    border-radius: 6px;
    margin-bottom: 15px;
    transition: all 0.2s;
}

.save-preset-content input:focus {
    outline: none;
    border-color: #3b82f6;
    box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.1);
}

.save-preset-actions {
    display: flex;
    gap: 10px;
}

/* Toast Notifications */
#toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast {
    background: #ffffff;
    border: 1px solid #d0d7de;
    border-radius: 8px;
    padding: 14px 18px;
    min-width: 280px;
    max-width: 400px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15), 0 4px 8px rgba(0, 0, 0, 0.1);
    opacity: 0;
    transform: translateX(400px);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.toast.show {
    opacity: 1;
    transform: translateX(0);
}

.toast-content {
    display: flex;
    align-items: center;
    gap: 12px;
}

.toast-icon {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.toast-icon svg {
    width: 12px;
    height: 12px;
}

.toast.success {
    border-color: #10b981;
    background: #f0fdf4;
}

.toast.success .toast-icon {
    background: #10b981;
}

.toast.success .toast-icon svg {
    stroke: #ffffff;
    stroke-width: 3;
}

.toast.error {
    border-color: #cf222e;
    background: #fff1f0;
}

.toast.error .toast-icon {
    background: #cf222e;
}

.toast.error .toast-icon svg {
    stroke: #ffffff;
    stroke-width: 3;
}

.toast-message {
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    color: #24292f;
    font-weight: 500;
    line-height: 1.4;
}

/* Dark Mode Toast Styles */
body.dark-mode .toast {
    background: #161b22;
    border-color: #30363d;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.6), 0 4px 8px rgba(0, 0, 0, 0.4);
}

body.dark-mode .toast.success {
    background: #0d1a14;
    border-color: #10b981;
}

body.dark-mode .toast.error {
    background: #1a1212;
    border-color: #f85149;
}

body.dark-mode .toast-message {
    color: #e6edf3;
}

/* Main Calculator Styles */
.stopwatch {
    margin-bottom: 24px;
    padding: 24px;
    background: #f6f8fa;
    border: 2px solid #d0d7de;
    border-radius: 12px;
}

.stopwatch-display {
    font-family: 'Inter', sans-serif;
    font-size: 56px;
    font-weight: 600;
    color: #24292f;
    text-align: center;
    margin-bottom: 16px;
    letter-spacing: -0.03em;
    font-variant-numeric: tabular-nums;
    min-width: 200px;
    line-height: 1;
}

.stopwatch-controls {
    display: flex;
    gap: 12px;
    justify-content: center;
}

.stopwatch-btn {
    padding: 12px 24px;
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    font-weight: 500;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    transition: all 0.15s;
    display: flex;
    align-items: center;
    gap: 8px;
    justify-content: center;
    min-width: 120px;
}

.stopwatch-btn svg {
    flex-shrink: 0;
}

.stopwatch-btn .btn-text {
    min-width: 50px;
    text-align: left;
}

.stopwatch-btn.play-pause {
    background: #10b981;
    color: #ffffff;
}

.stopwatch-btn.play-pause:hover {
    background: #059669;
}

.stopwatch-btn.play-pause.paused {
    background: #f59e0b;
}

.stopwatch-btn.play-pause.paused:hover {
    background: #d97706;
}

.stopwatch-btn.reset {
    background: #f6f8fa;
    color: #24292f;
    border: 1px solid #d0d7de;
    position: relative;
    overflow: hidden;
    min-height: 44px;
}

.stopwatch-btn.reset:hover {
    background: #eaeef2;
    color: #24292f;
    border-color: #afb8c1;
}

.stopwatch-btn.reset.confirming {
    padding: 0;
}

.stopwatch-btn.reset.confirming:hover {
    background: transparent;
}

.reset-normal {
    display: flex;
    align-items: center;
    gap: 8px;
}

.stopwatch-btn.reset.confirming .reset-normal {
    display: none;
}

.reset-confirm {
    display: none;
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
}

.reset-confirm.hidden {
    display: none !important;
}

.stopwatch-btn.reset.confirming .reset-confirm {
    display: flex !important;
}

.reset-confirm-btn {
    flex: 1;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
}

.reset-confirm-btn.confirm {
    background: #10b981;
}

.reset-confirm-btn.confirm:hover {
    background: #059669;
}

.reset-confirm-btn.confirm svg {
    stroke: #ffffff;
}

.reset-confirm-btn.cancel {
    background: #ef4444;
}

.reset-confirm-btn.cancel:hover {
    background: #dc2626;
}

.reset-confirm-btn.cancel svg {
    stroke: #ffffff;
}

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

.input-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin-bottom: 20px;
}

.input-group {
    display: flex;
    flex-direction: column;
}

.input-group.full-width {
    grid-column: 1 / -1;
}

.input-group label {
    font-size: 13px;
    font-weight: 600;
    color: #24292f;
    margin-bottom: 8px;
    display: block;
    letter-spacing: -0.01em;
}

.input-group input[type="number"],
.input-group input[type="text"] {
    width: 100%;
    padding: 12px 16px;
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    font-weight: 400;
    color: #24292f;
    background: #ffffff;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    transition: all 0.15s;
    -moz-appearance: textfield;
    appearance: textfield;
}

/* Remove scroll arrows from number inputs */
.input-group input[type="number"]::-webkit-outer-spin-button,
.input-group input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.input-group input[type="number"]:focus,
.input-group input[type="text"]:focus {
    outline: none;
    border-color: #3b82f6;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.time-input-group {
    display: flex;
    gap: 12px;
}

.time-input-group .input-wrapper {
    flex: 1;
}

.sub-label {
    font-size: 12px;
    font-weight: 500;
    color: #57606a;
    margin-bottom: 6px;
    display: block;
}

.checkbox-group {
    display: flex;
    align-items: center;
    margin-bottom: 16px;
    padding: 16px;
    background: #f9fafb;
    border-radius: 8px;
    border: 2px solid #e5e7eb;
    transition: all 0.15s;
    cursor: pointer;
}

.checkbox-group:hover {
    background: #f3f4f6;
    border-color: #d1d5db;
}

.checkbox-group:has(input[type="checkbox"]:checked) {
    background: #ecfdf5;
    border-color: #10b981;
}

.checkbox-group:has(input[type="checkbox"]:checked):hover {
    background: #d1fae5;
    border-color: #059669;
}

.checkbox-group:has(input[type="checkbox"]:checked) label {
    color: #047857;
    font-weight: 600;
}

.time-preset-buttons {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}

.time-preset-btn {
    flex: 1;
    padding: 10px 16px;
    font-family: 'Inter', sans-serif;
    font-size: 13px;
    font-weight: 500;
    color: #24292f;
    background: #ffffff;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.15s;
}

.time-preset-btn:hover {
    background: #f9fafb;
    border-color: #3b82f6;
    color: #3b82f6;
}

.time-preset-btn:active {
    transform: scale(0.98);
}

.checkbox-group input[type="checkbox"] {
    width: 22px;
    height: 22px;
    margin-right: 12px;
    cursor: pointer;
    accent-color: #10b981;
}

.checkbox-group label {
    font-size: 14px;
    color: #24292f;
    cursor: pointer;
    flex: 1;
    margin: 0;
    font-weight: 400;
}

button#calculate-btn {
    width: 100%;
    padding: 16px;
    font-family: 'Inter', sans-serif;
    font-size: 15px;
    font-weight: 600;
    color: #ffffff;
    background: #3b82f6;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.15s;
    margin-top: 8px;
}

button#calculate-btn:hover {
    background: #2563eb;
}

button#calculate-btn:active {
    transform: scale(0.98);
}

#result-container {
    margin-top: 24px;
    padding: 24px;
    background: #f9fafb;
    border: 2px solid #e5e7eb;
    border-radius: 12px;
    text-align: center;
}

#total-score {
    font-family: 'Inter', sans-serif;
    font-size: 48px;
    font-weight: 600;
    color: #0969da;
    margin-bottom: 18px;
    letter-spacing: -0.02em;
    line-height: 1;
}

#score-breakdown {
    font-size: 14px;
    font-weight: 400;
    color: #57606a;
    line-height: 1.6;
    background: rgba(88, 166, 255, 0.03);
    padding: 16px;
    border-radius: 6px;
    border: 1px solid rgba(88, 166, 255, 0.15);
}

.breakdown-row {
    display: flex;
    justify-content: space-between;
    padding: 7px 0;
    border-bottom: 1px solid rgba(88, 166, 255, 0.1);
}

.breakdown-row:last-child {
    border-bottom: none;
}

@media (max-width: 600px) {
    body {
        padding: 12px;
        align-items: flex-start;
    }

    .calculator-container {
        padding: 16px;
    }

    h1 {
        font-size: 20px;
    }

    .github-link {
        font-size: 12px;
    }

    .input-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .stopwatch-display {
        font-size: 32px;
    }

    #total-score {
        font-size: 32px;
    }

    .header {
        gap: 12px;
        margin-bottom: 20px;
        padding-bottom: 12px;
    }

    .header-right {
        gap: 6px;
    }

    .dark-mode-btn {
        height: 36px;
        width: 36px;
    }

    .settings-icon {
        height: 36px;
        padding: 0 10px;
        gap: 6px;
    }

    .settings-text {
        font-size: 12px;
    }

    .stopwatch {
        padding: 16px;
        margin-bottom: 16px;
    }

    .checkbox-group {
        padding: 12px;
        margin-bottom: 12px;
    }

    #result-container {
        padding: 16px;
        margin-top: 16px;
    }

    #score-breakdown {
        padding: 12px;
        font-size: 13px;
    }

    .stopwatch-btn {
        padding: 10px 18px;
        min-width: 100px;
        font-size: 13px;
    }

    .input-group input[type="number"],
    .input-group input[type="text"] {
        padding: 10px 12px;
    }

    /* Modal optimizations for mobile */
    .modal-overlay {
        padding: 0;
        align-items: flex-start;
        overflow-y: auto;
    }

    .modal-content {
        padding: 12px;
        border-radius: 0;
        max-height: none;
        height: auto;
        min-height: 0;
        width: 100%;
        max-width: 100%;
        margin: 0;
        overflow-y: visible;
        display: flex;
        flex-direction: column;
    }

    .modal-header {
        margin-bottom: 10px;
        padding-bottom: 8px;
        flex-shrink: 0;
    }

    .modal-header h2 {
        font-size: 16px;
    }

    .close-btn {
        width: 30px;
        height: 30px;
        font-size: 20px;
    }

    .settings-group {
        margin-bottom: 0;
    }

    .settings-group label {
        font-size: 12px;
        margin-bottom: 4px;
    }

    .settings-group input[type="number"] {
        padding: 8px 10px;
        font-size: 14px;
    }

    .settings-description {
        font-size: 10px;
        margin-top: 2px;
        line-height: 1.2;
    }

    .settings-grid {
        gap: 10px;
        margin-bottom: 10px;
        grid-template-columns: repeat(2, 1fr);
    }

    /* Full width for Total Time field */
    .settings-grid .settings-group:last-child {
        grid-column: 1 / -1;
    }

    .preset-section {
        padding: 10px;
        margin-bottom: 10px;
    }

    .preset-section h3 {
        font-size: 12px;
        margin-bottom: 6px;
    }

    .preset-controls {
        gap: 6px;
        flex-direction: row;
    }

    .preset-select {
        flex: 1;
        padding: 8px 10px;
        font-size: 12px;
    }

    .preset-btn {
        padding: 8px 12px;
        font-size: 12px;
    }

    .time-preset-buttons {
        gap: 6px;
        margin-bottom: 10px;
    }

    .time-preset-btn {
        padding: 8px 10px;
        font-size: 11px;
    }

    .import-export-section {
        padding: 10px;
        margin-bottom: 10px;
    }

    .import-export-section h4 {
        font-size: 12px;
        margin-bottom: 6px;
    }

    .import-export-controls {
        gap: 6px;
    }

    .import-export-controls button {
        flex: 1;
        min-width: 90px;
        padding: 8px 10px;
        font-size: 12px;
    }

    .import-export-controls button .btn-text {
        display: none;
    }

    .validation-error {
        font-size: 10px;
        margin-top: 2px;
    }

    .modal-actions {
        padding-top: 10px;
        margin-top: 6px;
        gap: 8px;
        flex-shrink: 0;
    }

    .modal-btn {
        width: 100%;
        padding: 12px;
        font-size: 14px;
        font-weight: 600;
    }

    .save-preset-modal .modal-content {
        padding: 20px;
    }

    .save-preset-modal input[type="text"] {
        padding: 10px 12px;
        font-size: 14px;
    }
}

/* Dark Mode Styles */
body.dark-mode {
    background: #0d1117;
    color: #e6edf3;
}

body.dark-mode .calculator-container {
    background: #161b22;
    border-color: #30363d;
}

body.dark-mode h1 {
    color: #e6edf3;
}

body.dark-mode .title-icon {
    fill: #58a6ff;
}

body.dark-mode .github-link {
    color: #8b949e;
}

body.dark-mode .github-link:hover {
    color: #e6edf3;
}

body.dark-mode .header {
    border-bottom-color: #21262d;
}

body.dark-mode .dark-mode-btn,
body.dark-mode .settings-icon {
    background: #21262d;
    border-color: #30363d;
}

body.dark-mode .dark-mode-btn:hover,
body.dark-mode .settings-icon:hover {
    background: #30363d;
    border-color: #3b82f6;
}

body.dark-mode .dark-mode-btn svg,
body.dark-mode .settings-icon svg {
    stroke: #8b949e;
}

body.dark-mode .dark-mode-btn:hover svg,
body.dark-mode .settings-icon:hover svg {
    stroke: #3b82f6;
}

body.dark-mode .settings-text {
    color: #8b949e;
}

body.dark-mode .settings-icon:hover .settings-text {
    color: #3b82f6;
}

body.dark-mode .stopwatch {
    background: #0d1117;
    border-color: #30363d;
}

body.dark-mode .stopwatch-display {
    color: #e6edf3;
}

body.dark-mode .stopwatch-btn {
    background: #21262d;
    border-color: #30363d;
    color: #e6edf3;
}

body.dark-mode .stopwatch-btn:hover {
    background: #30363d;
}

body.dark-mode .stopwatch-btn.play-pause {
    background: #238636;
}

body.dark-mode .stopwatch-btn.play-pause:hover {
    background: #2ea043;
}

body.dark-mode .stopwatch-btn.play-pause.paused {
    background: #9e6a03;
}

body.dark-mode .stopwatch-btn.play-pause.paused:hover {
    background: #bb7506;
}

body.dark-mode .stopwatch-btn.reset {
    background: #21262d;
    border-color: #30363d;
}

body.dark-mode .stopwatch-btn.reset:hover {
    background: #30363d;
}

body.dark-mode .reset-confirm-btn.confirm {
    background: #238636;
}

body.dark-mode .reset-confirm-btn.confirm:hover {
    background: #2ea043;
}

body.dark-mode .reset-confirm-btn.cancel {
    background: #da3633;
}

body.dark-mode .reset-confirm-btn.cancel:hover {
    background: #f85149;
}

body.dark-mode .input-group label,
body.dark-mode .sub-label {
    color: #c9d1d9;
}

body.dark-mode .input-group input[type="number"],
body.dark-mode .input-group input[type="text"] {
    background: #0d1117;
    border-color: #30363d;
    color: #e6edf3;
}

body.dark-mode .input-group input[type="number"]:focus,
body.dark-mode .input-group input[type="text"]:focus {
    border-color: #3b82f6;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

body.dark-mode .checkbox-group {
    background: #0d1117;
    border-color: #30363d;
}

body.dark-mode .checkbox-group:hover {
    background: #161b22;
    border-color: #484f58;
}

body.dark-mode .checkbox-group label {
    color: #8b949e;
}

body.dark-mode .checkbox-group:has(input[type="checkbox"]:checked) {
    background: rgba(16, 185, 129, 0.1);
    border-color: #10b981;
}

body.dark-mode .checkbox-group:has(input[type="checkbox"]:checked):hover {
    background: rgba(16, 185, 129, 0.15);
}

body.dark-mode .checkbox-group:has(input[type="checkbox"]:checked) label {
    color: #3fb950;
}

body.dark-mode .time-preset-btn {
    background: #0d1117;
    border-color: #30363d;
    color: #8b949e;
}

body.dark-mode .time-preset-btn:hover {
    background: #161b22;
    border-color: #3b82f6;
    color: #3b82f6;
}

body.dark-mode #result-container {
    background: #0d1117;
    border-color: #30363d;
}

body.dark-mode .modal-overlay {
    background: rgba(0, 0, 0, 0.8);
}

body.dark-mode .modal-content {
    background: #161b22;
    border-color: #30363d;
}

body.dark-mode .modal-header {
    border-bottom-color: #21262d;
}

body.dark-mode .modal-header h2 {
    color: #e6edf3;
}

body.dark-mode .close-btn {
    color: #8b949e;
}

body.dark-mode .close-btn:hover {
    background: #21262d;
    color: #e6edf3;
}

body.dark-mode .modal-actions {
    border-top-color: #21262d;
}

body.dark-mode .modal-btn.primary {
    background: #58a6ff;
    color: #0d1117;
}

body.dark-mode .modal-btn.primary:hover {
    background: #79c0ff;
}

body.dark-mode .modal-btn.secondary {
    background: #21262d;
    border-color: #30363d;
    color: #e6edf3;
}

body.dark-mode .modal-btn.secondary:hover {
    background: #30363d;
    border-color: #484f58;
}

body.dark-mode .import-export-section {
    background: #0d1117;
    border-color: #30363d;
}

body.dark-mode .import-export-section h4 {
    color: #e6edf3;
}

body.dark-mode .preset-section {
    background: #0d1117;
    border-color: #30363d;
}

body.dark-mode .preset-section h3 {
    color: #e6edf3;
}

body.dark-mode .preset-select {
    background: #0d1117;
    border-color: #30363d;
    color: #e6edf3;
}

body.dark-mode .preset-select:focus {
    border-color: #58a6ff;
    box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.1);
}

body.dark-mode .preset-btn {
    background: #21262d;
    border-color: #30363d;
    color: #e6edf3;
}

body.dark-mode .preset-btn:hover {
    background: #58a6ff;
    border-color: #58a6ff;
    color: #0d1117;
}

body.dark-mode .preset-btn.danger {
    background: #1a1212;
    color: #f85149;
    border-color: #da3633;
}

body.dark-mode .preset-btn.danger:hover {
    background: #da3633;
    color: #ffffff;
    border-color: #da3633;
}

body.dark-mode .settings-group label {
    color: #e6edf3;
}

body.dark-mode .settings-description {
    color: #8b949e;
}

body.dark-mode .settings-group input[type="number"] {
    background: #0d1117;
    border-color: #30363d;
    color: #e6edf3;
}

body.dark-mode .settings-group input[type="number"]:focus {
    border-color: #58a6ff;
    box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.1);
}

body.dark-mode .settings-group input.error {
    border-color: #f85149;
    background: rgba(248, 81, 73, 0.1);
}

body.dark-mode .validation-error {
    color: #f85149;
}

body.dark-mode .preset-item {
    background: #0d1117;
    border-color: #30363d;
}

body.dark-mode .preset-item:hover {
    border-color: #484f58;
}

body.dark-mode .preset-name {
    color: #e6edf3;
}

body.dark-mode .preset-description {
    color: #6e7681;
}