/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #007AFF;
    --secondary-color: #5AC8FA;
    --success-color: #34C759;
    --warning-color: #FF9500;
    --error-color: #FF3B30;
    --text-primary: #1D1D1F;
    --text-secondary: #86868B;
    --background-primary: #FBFBFD;
    --background-secondary: #F5F5F7;
    --background-tertiary: #FFFFFF;
    --border-color: #D1D1D6;
    --shadow-light: 0 2px 16px rgba(0, 0, 0, 0.06);
    --shadow-medium: 0 4px 32px rgba(0, 0, 0, 0.12);
    --border-radius: 12px;
    --border-radius-large: 20px;
    --transition: all 0.3s cubic-bezier(0.25, 0.1, 0.25, 1);
}

body {
    font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, var(--background-primary) 0%, var(--background-secondary) 100%);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}


/* Navigation */
.nav {
    background: var(--background-tertiary);
    border-bottom: 1px solid var(--border-color);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 24px;
    gap: 32px;
}

.nav-brand {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.nav-brand .logo {
    font-size: 1.4rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    margin: 0;
    line-height: 1.2;
}

.nav-brand .tagline {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 400;
    font-style: italic;
    margin: 0;
    opacity: 0.7;
    line-height: 1.2;
}

.nav-buttons {
    display: flex;
    gap: 8px;
}

.nav-button {
    background: transparent;
    border: none;
    padding: 10px 20px;
    border-radius: var(--border-radius);
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.nav-button:hover {
    background: var(--background-secondary);
    color: var(--text-primary);
}

.nav-button.active {
    background: var(--primary-color);
    color: white;
    box-shadow: var(--shadow-light);
}

/* Main content */
.main {
    padding: 48px 0 80px;
}

.tool-section {
    display: none;
    animation: fadeIn 0.5s ease-out;
}

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

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

.tool-card {
    background: var(--background-tertiary);
    border-radius: var(--border-radius-large);
    padding: 40px;
    box-shadow: var(--shadow-medium);
    border: 1px solid var(--border-color);
    max-width: 800px;
    margin: 0 auto;
}

.tool-card h2 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 32px;
    text-align: center;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

/* System Info Grid */
.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 32px;
}

.info-item {
    background: var(--background-secondary);
    border-radius: var(--border-radius);
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.info-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-light);
}

.info-item label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.info-value {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    font-family: 'SF Mono', Monaco, monospace;
    word-break: break-all;
    line-height: 1.4;
    max-height: 4.2em;
    overflow: hidden;
    text-overflow: ellipsis;
}

.copy-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    align-self: flex-start;
}

.copy-btn:hover {
    background: #0056CC;
    transform: translateY(-1px);
}

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

.refresh-btn {
    background: var(--success-color);
    color: white;
    border: none;
    padding: 16px 32px;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin: 0 auto;
}

.refresh-btn:hover {
    background: #30D158;
    transform: translateY(-2px);
    box-shadow: var(--shadow-light);
}

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

.refresh-btn:hover .refresh-icon {
    transform: rotate(180deg);
}

/* Audio Controls */
.audio-controls {
    display: flex;
    flex-direction: column;
    gap: 32px;
    align-items: center;
}


/* Global Audio Controls */
.global-audio-controls {
    display: grid;
    grid-template-columns: 1fr auto auto;
    gap: 24px;
    align-items: center;
    padding: 20px;
    background: var(--background-secondary);
    border-radius: var(--border-radius);
    margin-bottom: 24px;
    border: 1px solid var(--border-color);
}

.audio-status {
    display: flex;
    justify-content: center;
    align-items: center;
}

.timer {
    font-family: 'SF Mono', Monaco, monospace;
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--primary-color);
}

.main-controls {
    display: flex;
    gap: 8px;
    justify-content: flex-end;
}

.stop-btn {
    background: var(--error-color);
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.stop-btn:hover {
    background: #FF453A;
    transform: translateY(-1px);
    box-shadow: var(--shadow-light);
}

/* Tab Panels */
.audio-tab-content {
    position: relative;
}

.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
    animation: fadeIn 0.3s ease-out;
}

/* Sweep Controls */
.sweep-controls {
    display: flex;
    flex-direction: column;
    gap: 16px;
    align-items: center;
    background: var(--background-secondary);
    padding: 20px;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    width: 100%;
    max-width: 500px;
}

.sweep-range {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.sweep-range input[type="number"] {
    width: 80px;
    padding: 6px 8px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--background-tertiary);
    font-size: 0.9rem;
    text-align: center;
}

.sweep-duration {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    width: 100%;
}

.critical-frequencies, .noise-types, .channel-tests, .phase-tests, .reference-levels, .dynamic-tests, .click-presets {
    display: flex;
    flex-direction: column;
    gap: 16px;
    align-items: center;
    background: var(--background-secondary);
    padding: 20px;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    width: 100%;
    max-width: 600px;
}

.freq-grid, .noise-buttons, .channel-buttons, .phase-buttons, .level-buttons, .dynamic-buttons, .bpm-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 8px;
    width: 100%;
}

.noise-info {
    background: var(--background-secondary);
    padding: 16px;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    width: 100%;
    max-width: 600px;
}

.noise-info p {
    margin: 8px 0;
    font-size: 0.9rem;
    line-height: 1.4;
    color: var(--text-primary);
}

/* BPM Controls */
.bpm-control {
    display: flex;
    flex-direction: column;
    gap: 12px;
    align-items: center;
    background: var(--background-secondary);
    padding: 20px;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    width: 100%;
    max-width: 400px;
}

.click-settings {
    display: flex;
    flex-direction: column;
    gap: 16px;
    align-items: center;
    background: var(--background-secondary);
    padding: 20px;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    width: 100%;
    max-width: 300px;
}

.accent-control {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    color: var(--text-primary);
    cursor: pointer;
}

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

.time-signature select {
    background: var(--background-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 8px 12px;
    font-size: 0.9rem;
    color: var(--text-primary);
    cursor: pointer;
}

.frequency-control,
.volume-control {
    display: flex;
    flex-direction: column;
    gap: 12px;
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.frequency-control label,
.volume-control label,
.wave-control label {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    height: 6px;
    background: var(--background-secondary);
    border-radius: 3px;
    outline: none;
    border: 1px solid var(--border-color);
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-medium);
}

input[type="range"]::-moz-range-thumb {
    width: 24px;
    height: 24px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow-light);
}

#frequency-value,
#volume-value {
    font-weight: 600;
    color: var(--primary-color);
    font-size: 1.1rem;
}

.wave-control {
    text-align: center;
}

.wave-control select {
    background: var(--background-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 12px 20px;
    font-size: 1rem;
    color: var(--text-primary);
    cursor: pointer;
    min-width: 150px;
    margin-top: 8px;
}

.preset-frequencies,
.music-test {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
}

.music-test {
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}

.music-test label {
    width: 100%;
    text-align: center;
    margin-bottom: 12px;
    font-weight: 500;
    color: var(--text-secondary);
}

.freq-btn {
    background: var(--background-secondary);
    border: 1px solid var(--border-color);
    padding: 12px 20px;
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

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

.freq-btn.active {
    background: var(--success-color);
    color: white;
    border-color: var(--success-color);
    box-shadow: var(--shadow-light);
    transform: translateY(-1px);
}

.freq-btn.active:hover {
    background: #30D158;
}

.freq-btn.active::after {
    content: '▶';
    position: absolute;
    top: 50%;
    right: 8px;
    transform: translateY(-50%);
    font-size: 0.7rem;
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.play-btn {
    background: var(--success-color);
    color: white;
    border: none;
    padding: 20px 40px;
    border-radius: var(--border-radius-large);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 12px;
    box-shadow: var(--shadow-light);
}

.play-btn:hover {
    background: #30D158;
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.play-btn.playing {
    background: var(--error-color);
}

.play-btn.playing:hover {
    background: #FF453A;
}

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

/* Color Grid */
.color-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.color-btn {
    background: var(--background-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 24px 16px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 80px;
}

.color-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-light);
    border-color: var(--primary-color);
}

.color-btn.gradient {
    background: linear-gradient(45deg, #FF0000, #FFFF00, #00FF00, #00FFFF, #0000FF, #FF00FF);
    color: white;
    text-shadow: 0 1px 2px rgba(0,0,0,0.5);
}

.color-btn.pattern {
    background-image: 
        repeating-linear-gradient(45deg, transparent, transparent 10px, var(--text-secondary) 10px, var(--text-secondary) 20px),
        repeating-linear-gradient(-45deg, transparent, transparent 10px, var(--border-color) 10px, var(--border-color) 20px);
}

.hint {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-style: italic;
}

/* Fullscreen overlay */
.fullscreen-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    display: none;
    cursor: none;
}

.fullscreen-overlay.active {
    display: block;
}

.exit-hint {
    position: absolute;
    top: 24px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 12px 24px;
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    font-weight: 500;
    opacity: 0.8;
    animation: fadeInOut 3s infinite;
}


.exit-hint {
    transition: opacity 0.5s ease;
}

@keyframes fadeInOut {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 0.8; }
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }
    
    .header .container {
        padding: 24px 16px;
    }
    
    .logo {
        font-size: 2rem;
    }
    
    .tagline {
        font-size: 1rem;
    }
    
    .nav .container {
        flex-direction: column;
        gap: 12px;
        padding: 12px 16px;
        align-items: flex-start;
    }
    
    .nav-brand .logo {
        font-size: 1.25rem;
    }
    
    .nav-brand .tagline {
        font-size: 0.7rem;
    }
    
    .nav-buttons {
        width: 100%;
        justify-content: center;
    }
    
    .nav-button {
        flex: 1;
        text-align: center;
        min-width: 80px;
    }
    
    .tool-card {
        padding: 24px;
        margin: 0 16px;
    }
    
    .tool-card h2 {
        font-size: 1.5rem;
        margin-bottom: 24px;
    }
    
    .info-item {
        padding: 16px;
    }
    
    .color-grid {
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
        gap: 12px;
    }
    
    .color-btn {
        min-height: 60px;
        padding: 16px 12px;
        font-size: 0.8rem;
    }
    
    .preset-frequencies {
        flex-direction: column;
        align-items: center;
    }
    
    .freq-btn {
        width: 100%;
        max-width: 200px;
    }
    
    .audio-controls {
        gap: 24px;
    }
    
    
    .global-audio-controls {
        grid-template-columns: 1fr auto;
        gap: 16px;
        padding: 16px;
        text-align: center;
    }
    
    .main-controls {
        justify-content: center;
    }
    
    .sweep-controls, .critical-frequencies, .noise-types, .channel-tests, .phase-tests, .reference-levels, .dynamic-tests, .click-presets, .bpm-control, .click-settings {
        padding: 16px;
        max-width: none;
    }
    
    .freq-grid, .noise-buttons, .channel-buttons, .phase-buttons, .level-buttons, .dynamic-buttons, .bpm-buttons {
        grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
        gap: 6px;
    }
    
    .sweep-range {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }
    
    .timer {
        font-size: 1rem;
    }
}

/* Clock tool styles */
.clock-controls {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 40px;
}

.clock-options {
    display: flex;
    flex-direction: column;
    gap: 24px;
    width: 100%;
    max-width: 600px;
    align-items: center;
    margin: 0 auto;
}

/* Timezone select option styling */
.clock-option:nth-child(5) {
    align-self: center;
    margin-top: 8px;
    max-width: 350px;
}

@media (min-width: 768px) {
    .clock-options {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 24px 32px;
        justify-items: center;
        align-items: start;
        max-width: 600px;
    }
    
    /* Center the timezone select below the grid */
    .clock-option:nth-child(5) {
        grid-column: 1 / -1;
        justify-self: center;
        margin-top: 16px;
        max-width: 350px;
    }
}

.clock-option {
    display: flex;
    flex-direction: column;
    gap: 8px;
    align-items: center;
    text-align: center;
    width: 100%;
    max-width: 250px;
}

.clock-option label {
    font-weight: 500;
    color: var(--text-secondary);
}

.checkbox-label {
    display: flex !important;
    flex-direction: row !important;
    align-items: center;
    justify-content: center;
    gap: 12px;
    cursor: pointer;
}

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

#timezone-select {
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--background-tertiary);
    color: var(--text-primary);
    font-size: 1rem;
    width: 100%;
    text-align: center;
    text-align-last: center;
}

.clock-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    padding: 16px 32px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.clock-btn:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-light);
}

/* Modern tab styling (used by both clock and audio) */
.clock-type-tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 24px;
    background: var(--background-secondary);
    padding: 4px;
    border-radius: var(--border-radius);
}

.clock-type-tab {
    flex: 1;
    padding: 12px 16px;
    background: transparent;
    border: none;
    border-radius: calc(var(--border-radius) - 2px);
    color: var(--text-secondary);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.clock-type-tab.active {
    background: var(--background-tertiary);
    color: var(--primary-color);
    box-shadow: var(--shadow-light);
}

.clock-type-tab:hover:not(.active) {
    color: var(--text-primary);
}

/* Color palette */
.color-palette {
    margin-bottom: 24px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.color-palette label {
    display: block;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 16px;
    text-align: center;
}

.palette-colors {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 12px;
    justify-content: center;
    max-width: 400px;
}

.palette-color {
    width: 60px;
    height: 60px;
    border: 3px solid var(--border-color);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.palette-color.active {
    border-color: var(--primary-color);
    border-width: 4px;
    transform: scale(1.1);
}

.palette-color:hover:not(.active) {
    transform: scale(1.05);
    border-color: var(--text-secondary);
}

/* Clock tab content */
.clock-tab-content {
    display: none;
}

.clock-tab-content.active {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 32px;
}

/* Timer controls */
.timer-controls {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
}

.timer-display {
    font-size: 3rem;
    font-weight: 300;
    font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    text-align: center;
    min-width: 280px;
    font-variant-numeric: tabular-nums;
    font-feature-settings: "tnum" 1;
}

.timer-buttons {
    display: flex;
    gap: 12px;
}

.timer-btn {
    padding: 12px 24px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--background-tertiary);
    color: var(--text-primary);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.timer-btn:hover:not(:disabled) {
    border-color: var(--primary-color);
    transform: translateY(-1px);
}

.timer-btn.start {
    background: var(--success-color);
    border-color: var(--success-color);
    color: white;
}

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

.timer-btn.reset {
    background: var(--error-color);
    border-color: var(--error-color);
    color: white;
}

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

/* Countdown setup */
.countdown-setup {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.time-inputs {
    display: flex;
    gap: 16px;
    justify-content: center;
}

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

.time-input label {
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.time-input input {
    width: 80px;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--background-tertiary);
    color: var(--text-primary);
    font-size: 1.2rem;
    text-align: center;
    font-weight: 500;
}

.time-input input:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Signage tool styles */
.signage-controls {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

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

.signage-input label {
    font-weight: 500;
    color: var(--text-secondary);
    text-align: center;
}

#signage-text,
#qr-code-text {
    padding: 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--background-tertiary);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
}

#signage-text {
    resize: vertical;
    min-height: 100px;
}

.signage-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.signage-option {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.signage-option label {
    font-weight: 500;
    color: var(--text-secondary);
    text-align: center;
}

.signage-option input[type="color"] {
    width: 60px;
    height: 40px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    cursor: pointer;
}

.signage-option input[type="range"] {
    width: 100%;
}

.signage-btn {
    background: var(--success-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    padding: 16px 32px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    align-self: center;
}

.signage-btn:hover {
    background: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-light);
}

/* Fullscreen clock and signage styles */
.fullscreen-content {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    width: 100vw;
    position: relative;
}

#fullscreen-clock,
#fullscreen-stopwatch,
#fullscreen-countdown {
    color: white;
    text-align: center;
}

.timer-time {
    font-size: 15vmin;
    font-weight: 300;
    line-height: 1;
    margin-bottom: 4vmin;
    font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    letter-spacing: -0.02em;
    font-variant-numeric: tabular-nums;
    font-feature-settings: "tnum" 1;
}

.timer-controls-overlay {
    display: flex;
    gap: 2vmin;
    justify-content: center;
    position: absolute;
    bottom: 8vmin;
    left: 50%;
    transform: translateX(-50%);
    transition: opacity 0.5s ease;
}

.timer-overlay-btn {
    padding: 1.5vmin 3vmin;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 1vmin;
    background: rgba(0, 0, 0, 0.8);
    color: white;
    font-size: 2.5vmin;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    position: relative;
    z-index: 10;
}

.timer-overlay-btn:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.6);
    transform: translateY(-0.5vmin);
}

.timer-overlay-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
    transform: none;
}

.clock-time {
    font-size: 15vmin;
    font-weight: 300;
    line-height: 1;
    margin-bottom: 2vmin;
    font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    letter-spacing: -0.02em;
    font-variant-numeric: tabular-nums;
    font-feature-settings: "tnum" 1;
}

.clock-timezone {
    font-size: 4vmin;
    font-weight: 400;
    opacity: 0.8;
    display: none;
    font-variant-numeric: tabular-nums;
    font-feature-settings: "tnum" 1;
}

/* Info labels for fullscreen modes */
.clock-info,
.timer-info {
    font-size: 3vmin;
    font-weight: 500;
    opacity: 0.7;
    margin-bottom: 3vmin;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

#fullscreen-signage {
    position: relative;
    width: 100%;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.signage-text {
    width: 90%;
    max-width: 90vw;
    padding: 2rem;
    text-align: center;
    font-weight: 500;
    line-height: 1.2;
    word-wrap: break-word;
    hyphens: auto;
    outline: none;
    cursor: text;
    /* Make cursor invisible */
    caret-color: transparent;
    /* Allow natural block layout for contenteditable */
    display: block;
    white-space: pre-wrap; /* Preserve line breaks and spaces */
    box-sizing: border-box;
    /* Remove fixed height to allow content-based sizing */
    min-height: auto;
}

/* Placeholder for empty contenteditable */
.signage-text:empty:before {
    content: attr(data-placeholder);
    opacity: 0.5;
    font-style: italic;
}

.signage-text:focus {
    outline: none;
    caret-color: transparent;
}

/* QR Code styling */
.qr-code-container {
    margin-top: 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
}

.qr-code-container img {
    max-width: 200px;
    max-height: 200px;
    border-radius: 8px;
    background: white;
    padding: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}


@media (max-width: 480px) {
    .main {
        padding: 24px 0 40px;
    }
    
    .tool-card {
        margin: 0 8px;
        padding: 20px;
    }
    
    .info-grid {
        gap: 16px;
    }
    
    .color-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .clock-options,
    .signage-options {
        grid-template-columns: 1fr;
    }
    
    .signage-editor {
        width: 90%;
    }
}