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

:root {
    --primary-color: #3b82f6;
    --primary-dark: #2563eb;
    --primary-light: #60a5fa;
    --success-color: #10b981;
    --error-color: #ef4444;
    --bg-color: #0f1419;
    --surface-color: #1a1f2e;
    --text-color: #e5e7eb;
    --text-muted: #9ca3af;
    --border-color: #374151;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    width: 100%;
}

/* Global title centering */
h1, h2 {
    text-align: center;
    white-space: nowrap;
    font-size: clamp(1.2rem, 3vw, 2rem);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    padding: 40px 20px;
    margin-bottom: 30px;
}

header h1 {
    font-size: clamp(1.5rem, 5vw, 2.5rem);
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 10px;
    text-align: center;
    white-space: nowrap;
}

.subtitle {
    color: var(--text-muted);
    font-size: clamp(0.9rem, 2.5vw, 1.1rem);
    margin-bottom: 20px;
    text-align: center;
}

.features-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    justify-content: center;
    margin-top: 30px;
    padding: 25px 20px;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.05), rgba(59, 130, 246, 0.02));
    border-radius: 16px;
    border: 1px solid rgba(59, 130, 246, 0.15);
    position: relative;
    overflow: hidden;
}

.features-badges::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.1), transparent);
    animation: shimmer 3s infinite;
}

@keyframes shimmer {
    0% { left: -100%; }
    100% { left: 200%; }
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 0;
    background: transparent;
    border: none;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-color);
    white-space: nowrap;
    position: relative;
    transition: all 0.3s ease;
}

.badge::before {
    content: '';
    width: 6px;
    height: 6px;
    background: var(--primary-color);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--primary-color);
    animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
    0%, 100% {
        box-shadow: 0 0 8px var(--primary-color);
        transform: scale(1);
    }
    50% {
        box-shadow: 0 0 16px var(--primary-color);
        transform: scale(1.2);
    }
}

.badge:hover {
    color: var(--primary-light);
    transform: translateX(5px);
}

.badge:hover::before {
    background: var(--primary-light);
    box-shadow: 0 0 12px var(--primary-light);
}

/* Theme Customizer */
.nav-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.theme-customizer {
    position: relative;
    z-index: 1000;
}

.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 8px;
    transition: all 0.2s ease;
}

.theme-toggle:hover {
    color: var(--primary-color);
    transform: scale(1.1);
}

.theme-picker-panel {
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    width: 280px;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
}

.theme-picker-panel.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.theme-picker-panel h3 {
    color: var(--text-color);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 15px;
    text-align: center;
}

.color-presets {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 10px;
    margin-bottom: 20px;
}

.color-preset {
    width: 40px;
    height: 40px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
}

.color-preset:hover {
    transform: scale(1.1);
    border-color: var(--text-color);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.color-preset.active::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 1.2rem;
    font-weight: bold;
    text-shadow: 0 0 4px rgba(0, 0, 0, 0.5);
}

.custom-color-picker {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 15px;
}

.custom-color-picker label {
    color: var(--text-color);
    font-size: 0.9rem;
    font-weight: 500;
}

.custom-color-picker input[type="color"] {
    width: 100%;
    height: 45px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    background: var(--bg-color);
}

.reset-theme {
    width: 100%;
    padding: 10px;
    background: var(--bg-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.reset-theme:hover {
    background: #252d3d;
    border-color: var(--primary-color);
}


.tool-nav {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: center;
    margin-bottom: 30px;
}

.nav-btn {
    padding: 12px 24px;
    background: var(--surface-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.nav-btn:hover {
    background: #252d3d;
    border-color: var(--primary-color);
}

.nav-btn.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
}


.tool-content {
    margin-bottom: 20px;
}

.tool-section {
    display: none;
    background: var(--surface-color);
    padding: 40px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
}

.tool-section.active {
    display: block;
}

.tool-section h1 {
    font-size: clamp(1.5rem, 4vw, 2rem);
    margin-bottom: 10px;
    color: var(--text-color);
    font-weight: 600;
    text-align: center;
    white-space: nowrap;
}

.tool-section h2 {
    font-size: clamp(1.5rem, 4vw, 2rem);
    margin-bottom: 10px;
    color: var(--text-color);
    font-weight: 600;
    text-align: center;
    white-space: nowrap;
}

.category-title {
    text-align: center;
    white-space: nowrap;
    font-size: clamp(1.3rem, 3.5vw, 1.8rem);
}

.description {
    color: var(--text-muted);
    margin-bottom: 30px;
    font-size: clamp(0.9rem, 2.5vw, 1rem);
    text-align: center;
}


/* Number Converter Styles */
.converter-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 20px;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.input-group label {
    font-weight: 600;
    color: var(--text-color);
    font-size: 0.95rem;
}

.input-group input,
.input-group select,
.input-group textarea {
    padding: 12px 16px;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-color);
    font-size: 1rem;
    transition: all 0.2s ease;
}

.input-group input:hover,
.input-group select:hover,
.input-group textarea:hover {
    border-color: var(--primary-color);
}

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

.format-hint {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.clear-btn,
.convert-btn {
    padding: 12px 24px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.2s ease;
}

.clear-btn:hover,
.convert-btn:hover {
    background: var(--primary-dark);
}

.clear-btn:active,
.convert-btn:active {
    transform: scale(0.98);
}


/* Timezone & Currency Styles */
.timezone-container,
.currency-container {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.swap-button-container {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 10px 0;
}

.swap-button {
    background: var(--bg-color);
    border: 2px solid var(--border-color);
    border-radius: 50%;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--primary-color);
    transition: all 0.3s ease;
    padding: 0;
}

.swap-button:hover {
    background: var(--primary-color);
    color: white;
    transform: rotate(180deg);
    border-color: var(--primary-color);
}

.swap-button:active {
    transform: rotate(180deg) scale(0.95);
}

.swap-button svg {
    width: 24px;
    height: 24px;
}

/* Rich DateTime Picker Styles */
.datetime-picker {
    position: relative;
    width: 100%;
}

.datetime-display {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    background: var(--bg-color);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.datetime-display:hover {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.datetime-icon {
    color: var(--primary-color);
    flex-shrink: 0;
}

.datetime-text {
    flex: 1;
    color: var(--text-color);
    font-size: 1rem;
}

.datetime-now-btn {
    padding: 6px 12px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.datetime-now-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.datetime-panel {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    background: var(--bg-color);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
}

.datetime-panel.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.datetime-tabs {
    display: flex;
    border-bottom: 2px solid var(--border-color);
    background: rgba(var(--primary-rgb), 0.05);
    border-radius: 10px 10px 0 0;
}

.datetime-tab {
    flex: 1;
    padding: 12px;
    background: none;
    border: none;
    color: var(--text-muted);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
}

.datetime-tab:hover {
    color: var(--primary-color);
}

.datetime-tab.active {
    color: var(--primary-color);
}

.datetime-tab.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary-color);
}

.datetime-content {
    padding: 16px;
}

.datetime-tab-content {
    display: none;
}

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

/* Calendar Styles */
.calendar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.calendar-title {
    font-weight: 600;
    font-size: 1rem;
    color: var(--text-color);
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 6px;
    transition: all 0.2s ease;
}

.calendar-title:hover {
    background: var(--bg-secondary);
    color: var(--primary-color);
}

.calendar-nav {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-color);
    font-size: 1.2rem;
    transition: all 0.2s ease;
}

.calendar-nav:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.calendar-weekdays {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 4px;
    margin-bottom: 8px;
}

.calendar-weekdays div {
    text-align: center;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-muted);
    padding: 8px 4px;
}

.calendar-days {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 4px;
}

.calendar-day {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.9rem;
    color: var(--text-color);
    background: var(--bg-secondary);
}

.calendar-day:hover {
    background: var(--primary-color);
    color: white;
    transform: scale(1.05);
}

.calendar-day.other-month {
    color: var(--text-muted);
    opacity: 0.4;
}

.calendar-day.selected {
    background: var(--primary-color);
    color: white;
    font-weight: 600;
}

.calendar-day.today {
    border: 2px solid var(--primary-color);
}

/* Year/Month Selector Styles */
.year-month-selector {
    display: none;
    margin-bottom: 16px;
    padding: 12px;
    background: var(--bg-secondary);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.year-month-selector.active {
    display: block;
}

.selector-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.selector-title {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-color);
}

.selector-nav {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-color);
    font-size: 1rem;
    transition: all 0.2s ease;
}

.selector-nav:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.selector-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 12px;
    border-bottom: 2px solid var(--border-color);
}

.selector-tab {
    flex: 1;
    padding: 8px;
    background: none;
    border: none;
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
}

.selector-tab:hover {
    color: var(--primary-color);
}

.selector-tab.active {
    color: var(--primary-color);
}

.selector-tab.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary-color);
}

.selector-content {
    min-height: 200px;
    max-height: 400px;
    overflow-y: auto;
}

.selector-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
}

.selector-item {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.9rem;
    color: var(--text-color);
    background: var(--bg-color);
    border: 1px solid var(--border-color);
}

.selector-item:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: scale(1.05);
}

.selector-item.selected {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    font-weight: 600;
}

.selector-item.other-year {
    color: var(--text-muted);
    opacity: 0.5;
}

/* Time Picker Styles */
.time-picker {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    padding: 20px;
}

.time-input-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.time-input-group label {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 500;
}

.time-input {
    width: 80px;
    padding: 12px;
    font-size: 1.5rem;
    font-weight: 600;
    text-align: center;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-color);
    transition: all 0.2s ease;
}

.time-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.time-separator {
    font-size: 2rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-top: 24px;
}

.result-box {
    margin-top: 20px;
    padding: 24px;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1.5rem;
    font-weight: 600;
    text-align: center;
    color: var(--primary-light);
    min-height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.rate-info {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: 10px;
}

.rate-info a {
    transition: all 0.2s ease;
}

.rate-info a:hover {
    color: var(--primary-color);
}


/* Formatter Styles */
.formatter-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.editor-section {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.editor-section.full-width {
    grid-column: 1 / -1;
}

.editor-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.editor-header label {
    font-weight: 600;
    font-size: 1rem;
}

.editor-header select {
    padding: 10px 18px;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-color);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.editor-header select:hover {
    border-color: var(--primary-color);
}

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

.editor-controls {
    display: flex;
    gap: 8px;
}

.editor-controls button,
.editor-header > button {
    padding: 10px 18px;
    background: var(--surface-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.editor-controls button:hover,
.editor-header > button:hover {
    background: #252d3d;
    border-color: var(--primary-color);
}

textarea {
    width: 100%;
    min-height: 400px;
    padding: 16px;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-color);
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', 'Courier New', monospace;
    font-size: 14px;
    line-height: 1.6;
    resize: vertical;
    transition: all 0.2s ease;
}

textarea:hover {
    border-color: var(--primary-color);
}

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

.status-message {
    grid-column: 1 / -1;
    padding: 14px 20px;
    border-radius: 8px;
    font-weight: 500;
    text-align: center;
    margin-top: 15px;
    transition: all 0.2s ease;
}

.status-message.success {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid var(--success-color);
    color: var(--success-color);
}

.status-message.error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--error-color);
    color: var(--error-color);
}

.status-message.info {
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid var(--primary-color);
    color: var(--primary-light);
}


footer {
    margin-top: 0;
    padding: 40px 20px 20px;
    border-top: 1px solid var(--border-color);
    background: var(--surface-color);
    border-radius: 12px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto 30px;
}

.footer-section h3 {
    color: var(--text-color);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 15px;
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 8px;
    display: inline-block;
}

.footer-section p {
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 10px;
    font-size: 0.95rem;
}

.footer-section ul {
    list-style: none;
    padding: 0;
}

.footer-section ul li {
    color: var(--text-muted);
    padding: 5px 0;
    font-size: 0.95rem;
}

.footer-section ul li a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s ease;
}

.footer-section ul li a:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

/* Features section styling */
.footer-features .features-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px 20px;
    text-align: left;
}

.footer-features .features-list li {
    font-size: 0.9rem;
    padding: 4px 0;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-bottom a {
    color: var(--primary-light);
    text-decoration: none;
    transition: color 0.2s ease;
}

.footer-bottom a:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

.footer-note {
    margin-top: 10px;
    font-size: 0.85rem;
    font-style: italic;
    opacity: 0.8;
}


/* Responsive Design */
@media (max-width: 768px) {
    /* Keep titles on one line, handle overflow gracefully */
    h1, h2 {
        overflow: hidden;
        text-overflow: ellipsis;
        max-width: 100%;
    }

    .container {
        padding: 15px;
    }
    
    header {
        padding: 20px 15px;
        margin-bottom: 20px;
    }

    header h1 {
        margin-bottom: 8px;
    }

    .subtitle {
        margin-bottom: 12px;
        font-size: 0.9rem;
    }

    .features-badges {
        gap: 8px;
        padding: 12px 15px;
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        align-items: center;
        margin-top: 15px;
    }

    .badge {
        font-size: 0.8rem;
        justify-self: start;
    }

    .nav-btn {
        padding: 10px 16px;
        font-size: 0.9rem;
    }

    .tool-section {
        padding: 15px;
    }

    .converter-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .formatter-container {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    textarea {
        min-height: 300px;
        font-size: 13px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 25px;
    }

    .footer-section {
        text-align: center;
    }

    /* Features section - two columns on mobile */
    .footer-features .features-list {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 6px 12px;
        text-align: center;
        max-width: 100%;
        justify-content: center;
    }

    .footer-features .features-list li {
        font-size: 0.85rem;
        padding: 3px 0;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    /* Theme customizer mobile */
    .nav-actions {
        gap: 8px;
    }

    .theme-toggle {
        padding: 6px;
        font-size: 1.3rem;
    }

    .theme-picker-panel {
        width: calc(100vw - 40px);
        max-width: 320px;
        right: 0;
        left: auto;
        max-height: calc(100vh - 100px);
        overflow-y: auto;
    }

    .color-presets {
        grid-template-columns: repeat(5, 1fr);
        gap: 8px;
    }

    .color-preset {
        width: 35px;
        height: 35px;
    }
    
    /* Timezone and Currency containers */
    .timezone-container,
    .currency-container {
        padding: 0 10px;
    }
    
    /* Date calculator container */
    .date-calculator-container {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .calc-section {
        padding: 20px;
    }
    
    /* Date Calculator Redesigned - Mobile */
    .desktop-only {
        display: none !important;
    }
    
    .mobile-only {
        display: block !important;
    }
    
    .calculator-selector-grid {
        grid-template-columns: 1fr;
        gap: 12px;
        margin-bottom: 25px;
    }
    
    .calculator-dropdown {
        margin-bottom: 25px;
    }
    
    .modern-dropdown {
        padding: 14px 18px;
        font-size: 0.95rem;
        padding-right: 40px;
    }
    
    .calc-card {
        padding: 15px;
        gap: 12px;
    }
    
    .calc-card-icon {
        width: 50px;
        height: 50px;
        font-size: 2rem;
    }
    
    .calc-card-content h4 {
        font-size: 1rem;
    }
    
    .calc-card-content p {
        font-size: 0.8rem;
    }
    
    .calc-panel-header {
        padding: 20px;
        flex-direction: column;
        text-align: center;
        gap: 15px;
    }
    
    .calc-panel-icon {
        width: 60px;
        height: 60px;
        font-size: 2.5rem;
        margin: 0 auto;
    }
    
    .calc-panel-header h3 {
        font-size: 1.3rem;
    }
    
    .calc-panel-body {
        padding: 20px;
    }
    
    .input-row {
        grid-template-columns: 1fr;
        gap: 15px;
        width: 100%;
        box-sizing: border-box;
    }
    
    .input-wrapper {
        width: 100%;
        min-width: 0;
        overflow: hidden;
    }
    
    input[type="date"],
    input[type="datetime-local"],
    input[type="time"],
    .modern-input {
        width: 100%;
        max-width: 100%;
        box-sizing: border-box;
        font-size: 16px; /* Prevents zoom on iOS */
        min-width: 0;
    }
    
    /* Ensure date inputs stay within container on mobile */
    .input-wrapper {
        width: 100%;
        max-width: 100%;
        min-width: 0;
        overflow: hidden;
        box-sizing: border-box;
    }
    
    .input-row {
        width: 100%;
        max-width: 100%;
        box-sizing: border-box;
        overflow-x: hidden;
    }
    
    .calc-panel-body {
        width: 100%;
        max-width: 100%;
        box-sizing: border-box;
        overflow-x: hidden;
        padding: 15px 10px;
    }
    
    .date-calculator-wrapper {
        width: 100%;
        max-width: 100%;
        box-sizing: border-box;
        overflow-x: hidden;
    }
    
    /* Reduce date input padding on mobile to fit better */
    input[type="date"],
    input[type="datetime-local"] {
        padding: 12px 10px !important;
        font-size: 15px !important;
    }
    
    .modern-btn {
        padding: 14px 20px;
        font-size: 1rem;
    }
    
    .result-panel {
        padding: 20px;
    }
    
    /* Image tool containers */
    .image-tool-container {
        padding: 0 10px;
    }
    
    .upload-area {
        padding: 30px 20px;
    }
    
    .preview-container {
        flex-direction: column;
    }
    
    .preview-box {
        min-width: 100%;
    }
    
    .controls-group {
        padding: 15px;
    }
    
    .control-row {
        flex-direction: column;
        gap: 10px;
    }
    
    .control-row > * {
        min-width: 100%;
    }
    
    .dimension-inputs {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    .dimension-separator {
        display: none;
    }
    
    /* Button groups */
    .button-group {
        flex-direction: column;
    }
    
    .button-group button {
        width: 100%;
    }
    
    /* Result boxes */
    .result-box {
        padding: 20px;
        font-size: 1.2rem;
        min-height: 60px;
    }
    
    /* Editor controls */
    .editor-header {
        flex-direction: column;
        gap: 10px;
        align-items: stretch;
    }
    
    .editor-controls {
        flex-wrap: wrap;
    }
    
    .editor-controls button {
        flex: 1;
        min-width: calc(50% - 4px);
    }
    
    /* Tools grid on index page */
    .tools-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    /* Category titles */
    .category-title {
        font-size: clamp(1.2rem, 4vw, 1.5rem);
    }
    
    /* Datetime picker mobile */
    .datetime-picker {
        width: 100%;
    }
    
    .datetime-display {
        flex-wrap: wrap;
        padding: 10px 12px;
    }
    
    .datetime-now-btn {
        padding: 5px 10px;
        font-size: 0.8rem;
    }
    
    .datetime-panel {
        width: calc(100vw - 40px);
        max-width: 100%;
        left: 50%;
        transform: translateX(-50%);
    }
    
    .datetime-panel.active {
        transform: translateX(-50%) translateY(0);
    }
    
    .time-picker {
        flex-wrap: wrap;
        gap: 10px;
        padding: 15px;
    }
    
    .time-input {
        width: 60px;
        font-size: 1.2rem;
        padding: 10px;
    }
    
    .time-separator {
        font-size: 1.5rem;
        margin-top: 20px;
    }
    
    /* Calendar mobile */
    .calendar-header {
        flex-wrap: wrap;
        gap: 10px;
    }
    
    .calendar-weekdays {
        gap: 2px;
    }
    
    .calendar-weekdays div {
        font-size: 0.75rem;
        padding: 6px 2px;
    }
    
    .calendar-days {
        gap: 2px;
    }
    
    .calendar-day {
        font-size: 0.85rem;
    }
    
    .selector-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 6px;
    }
    
    .selector-content {
        max-height: 350px;
        min-height: 250px;
    }
    
    .selector-item {
        font-size: 0.8rem;
    }
    
    /* Swap button */
    .swap-button {
        width: 40px;
        height: 40px;
    }
    
    /* Input groups */
    .input-group input,
    .input-group select,
    .input-group textarea {
        font-size: 0.95rem;
        padding: 10px 14px;
    }
    
    /* Buttons */
    .clear-btn,
    .convert-btn {
        padding: 10px 20px;
        font-size: 0.9rem;
        width: 100%;
    }
    
    /* Date Calculator - Small Mobile */
    .calculator-selector-grid {
        gap: 10px;
    }
    
    .calc-card {
        padding: 12px;
        gap: 10px;
    }
    
    .calc-card-icon {
        width: 45px;
        height: 45px;
        font-size: 1.8rem;
    }
    
    .calculator-dropdown {
        margin-bottom: 20px;
    }
    
    .dropdown-label {
        font-size: 0.9rem;
        margin-bottom: 10px;
    }
    
    .modern-dropdown {
        padding: 12px 16px;
        font-size: 0.9rem;
        padding-right: 38px;
    }
    
    .calc-panel-header {
        padding: 15px;
    }
    
    .calc-panel-icon {
        width: 50px;
        height: 50px;
        font-size: 2rem;
    }
    
    .calc-panel-header h3 {
        font-size: 1.1rem;
    }
    
    .calc-panel-body {
        padding: 15px;
    }
    
    .modern-input {
        padding: 12px 14px;
        font-size: 0.95rem;
    }
    
    .modern-btn {
        padding: 12px 18px;
        font-size: 0.95rem;
    }
    
    .result-panel {
        padding: 15px;
    }
    
    /* Tool cards */
    .tool-card {
        padding: 20px;
    }
    
    .tool-icon {
        font-size: 2rem;
    }
    
    .tool-card h3 {
        font-size: 1.1rem;
    }
    
    .tool-card p {
        font-size: 0.9rem;
    }
}

/* Extra small screens */
@media (max-width: 480px) {
    .container {
        padding: 10px;
    }
    
    header {
        padding: 20px 10px;
    }
    
    header h1 {
        font-size: clamp(1.2rem, 6vw, 1.8rem);
    }
    
    .tool-section {
        padding: 12px;
    }
    
    .theme-toggle {
        padding: 4px;
        font-size: 1.2rem;
    }
    
    .theme-picker-panel {
        width: calc(100vw - 20px);
        padding: 15px;
    }
    
    .nav-container {
        padding: 0 10px;
    }
    
    .nav-logo {
        font-size: 1rem;
    }
    
    .mobile-menu-toggle {
        font-size: 1.2rem;
        padding: 4px;
    }
    
    .converter-grid {
        gap: 12px;
    }
    
    .formatter-container {
        gap: 12px;
    }
    
    textarea {
        min-height: 250px;
        font-size: 12px;
        padding: 12px;
    }
    
    .result-box {
        padding: 15px;
        font-size: 1rem;
    }
    
    .time-input {
        width: 50px;
        font-size: 1rem;
        padding: 8px;
    }
    
    .calendar-weekdays div {
        font-size: 0.7rem;
        padding: 4px 1px;
    }
    
    .calendar-day {
        font-size: 0.75rem;
    }
    
    .selector-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .selector-content {
        max-height: 400px;
        min-height: 300px;
    }
    
    /* Extra small screens - ensure date inputs fit within screen */
    input[type="date"],
    input[type="datetime-local"],
    input[type="time"] {
        width: auto !important;
        max-width: auto !important;
        min-width: 0 !important;
        box-sizing: border-box !important;
        font-size: 16px !important;
        padding: 12px 8px !important;
    }
    
    .input-wrapper {
        width: 100% !important;
        max-width: 100% !important;
        min-width: 0 !important;
        overflow: hidden !important;
        box-sizing: border-box !important;
    }
    
    .input-row {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        overflow-x: hidden !important;
        gap: 12px !important;
    }
    
    .calc-panel-body {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        overflow-x: hidden !important;
        padding: 12px 8px !important;
    }
    
    .date-calculator-wrapper {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        overflow-x: hidden !important;
    }
    
    .container {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        overflow-x: hidden !important;
        padding: 10px !important;
    }
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 12px;
    height: 12px;
}

::-webkit-scrollbar-track {
    background: var(--bg-color);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 6px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

/* Selection Styling */
::selection {
    background: rgba(99, 102, 241, 0.3);
    color: var(--text-color);
}

::-moz-selection {
    background: rgba(99, 102, 241, 0.3);
    color: var(--text-color);
}

/* Date Calculator Styles */
/* Date Calculator Redesigned Styles */
.date-calculator-wrapper {
    max-width: 1000px;
    margin: 0 auto;
    width: 100%;
    box-sizing: border-box;
}

/* Desktop/Mobile Visibility Classes */
.desktop-only {
    display: block;
}

.mobile-only {
    display: none;
}

/* Calculator Selector Grid - Card Based (Desktop) */
.calculator-selector-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 15px;
    margin-bottom: 40px;
}

/* Calculator Dropdown (Mobile) */
.calculator-dropdown {
    margin-bottom: 30px;
}

.dropdown-label {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-color);
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 12px;
}

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

.modern-dropdown {
    width: 100%;
    padding: 16px 20px;
    background: var(--surface-color);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-color);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2360a5fa' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    background-size: 12px;
    padding-right: 45px;
    font-family: inherit;
}

.modern-dropdown:hover {
    border-color: var(--primary-light);
    background-color: rgba(59, 130, 246, 0.05);
}

.modern-dropdown:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
    background-color: rgba(59, 130, 246, 0.08);
}

.modern-dropdown option {
    background: var(--surface-color);
    color: var(--text-color);
    padding: 12px;
}

.calc-card {
    background: var(--surface-color);
    border: 2px solid var(--border-color);
    border-radius: 16px;
    padding: 20px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-align: left;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    gap: 15px;
}

.calc-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.calc-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(59, 130, 246, 0.2);
    background: linear-gradient(135deg, var(--surface-color), rgba(59, 130, 246, 0.05));
}

.calc-card:hover::before {
    transform: scaleX(1);
}

.calc-card.active {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.15), rgba(59, 130, 246, 0.05));
    box-shadow: 0 8px 24px rgba(59, 130, 246, 0.3);
}

.calc-card.active::before {
    transform: scaleX(1);
}

.calc-card-icon {
    font-size: 2.5rem;
    line-height: 1;
    flex-shrink: 0;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(59, 130, 246, 0.1);
    border-radius: 12px;
    transition: all 0.3s ease;
}

.calc-card.active .calc-card-icon {
    background: var(--primary-color);
    transform: scale(1.1);
}

.calc-card-content h4 {
    color: var(--text-color);
    font-size: 1.1rem;
    font-weight: 600;
    margin: 0 0 5px 0;
}

.calc-card-content p {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin: 0;
    line-height: 1.4;
}

/* Calculator Panel */
.calc-panel {
    background: var(--surface-color);
    border-radius: 20px;
    border: 1px solid var(--border-color);
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    animation: fadeIn 0.3s ease;
}

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

.calc-panel-header {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(59, 130, 246, 0.05));
    padding: 30px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: flex-start;
    gap: 20px;
}

.calc-panel-icon {
    font-size: 3rem;
    line-height: 1;
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-color);
    border-radius: 16px;
    flex-shrink: 0;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.calc-panel-header h3 {
    color: var(--text-color);
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 0 8px 0;
    padding: 0;
    border: none;
}

.calc-description {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin: 0;
    line-height: 1.6;
}

.calc-panel-body {
    padding: 30px;
}

/* Input Row Layout */
.input-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 25px;
    width: 100%;
    box-sizing: border-box;
}

.input-wrapper {
    display: flex;
    flex-direction: column;
    gap: 8px;
    width: 100%;
    min-width: 0;
    box-sizing: border-box;
    overflow: hidden;
}

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

.input-wrapper label {
    color: var(--text-color);
    font-size: 0.9rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

.label-icon {
    font-size: 1.1rem;
}

.modern-input {
    width: 100%;
    padding: 14px 16px;
    background: var(--bg-color);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-color);
    font-size: 1rem;
    transition: all 0.3s ease;
    font-family: inherit;
    box-sizing: border-box;
    max-width: 100%;
}

/* Fix for date and datetime-local inputs */
input[type="date"],
input[type="datetime-local"],
input[type="time"] {
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    padding: 14px 16px;
    background: var(--bg-color);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-color);
    font-size: 1rem;
    transition: all 0.3s ease;
    font-family: inherit;
}

input[type="date"]:focus,
input[type="datetime-local"]:focus,
input[type="time"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
    background: rgba(59, 130, 246, 0.02);
}

input[type="date"]:hover,
input[type="datetime-local"]:hover,
input[type="time"]:hover {
    border-color: var(--primary-light);
}

.modern-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
    background: rgba(59, 130, 246, 0.02);
}

.modern-input:hover {
    border-color: var(--primary-light);
}

/* Modern Button */
.modern-btn {
    width: 100%;
    padding: 16px 24px;
    background: var(--primary-color);
    border: none;
    border-radius: 12px;
    color: white;
    font-size: 1.05rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-bottom: 25px;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.modern-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

.modern-btn:active {
    transform: translateY(0);
}

.btn-icon {
    font-size: 1.2rem;
    transition: transform 0.3s ease;
}

.modern-btn:hover .btn-icon {
    transform: translateX(4px);
}

/* Result Panel */
.result-panel {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.08), rgba(59, 130, 246, 0.03));
    border: 2px solid rgba(59, 130, 246, 0.2);
    border-radius: 16px;
    padding: 25px;
    min-height: 80px;
    animation: slideIn 0.3s ease;
}

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

.result-panel:empty {
    display: none;
}

/* Legacy support for old calc-section class */
.calc-section {
    background: var(--surface-color);
    padding: 25px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.calc-section h3 {
    color: var(--text-color);
    font-size: 1.2rem;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary-color);
}

/* Image Tool Styles */
.image-tool-container {
    max-width: 900px;
    margin: 0 auto;
}

.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 40px;
    text-align: center;
    background: var(--bg-color);
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 30px;
}

.upload-area:hover {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.05);
}

.upload-area.dragover {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.1);
    transform: scale(1.02);
}

.upload-icon {
    font-size: 4rem;
    margin-bottom: 15px;
    opacity: 0.6;
}

.upload-text {
    font-size: 1.1rem;
    color: var(--text-color);
    margin-bottom: 10px;
}

.upload-hint {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.file-input {
    display: none;
}

.image-preview {
    display: none;
    margin-top: 30px;
}

.image-preview.active {
    display: block;
}

.preview-container {
    display: flex;
    gap: 20px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.preview-box {
    flex: 1;
    min-width: 250px;
}

.preview-box h3 {
    font-size: 1rem;
    color: var(--text-color);
    margin-bottom: 10px;
}

.preview-box img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: var(--bg-color);
}

.image-info {
    background: var(--bg-color);
    padding: 15px;
    border-radius: 8px;
    margin-top: 10px;
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.6;
}

.controls-group {
    background: var(--bg-color);
    padding: 20px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    margin-bottom: 20px;
}

.control-row {
    display: flex;
    gap: 15px;
    align-items: flex-end;
    flex-wrap: wrap;
}

.control-row > * {
    flex: 1;
    min-width: 150px;
}

.dimension-inputs {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 10px;
    align-items: center;
}

.dimension-separator {
    color: var(--text-muted);
    font-size: 1.2rem;
    margin-bottom: 5px;
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 10px;
}

.checkbox-group input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.checkbox-group label {
    margin: 0;
    cursor: pointer;
}

.button-group {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

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