@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;600;700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Exo+2:wght@700;800&display=swap');

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

:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --background: #f8f9fb;
    --surface: #ffffff;
    --surface-elevated: #fafbfc;
    --text: #1e293b;
    --text-secondary: #64748b;
    --active: #6366f1;
    --border: #e2e8f0;
    --shadow: rgba(0, 0, 0, 0.06);
    --accent-bg: #f1f5f9;
    --card-size-scale: 1;
}

[data-theme="dark"] {
    --primary: #818cf8;
    --primary-hover: #a5b4fc;
    --background: #111827;
    --surface: #1f2937;
    --surface-elevated: #374151;
    --text: #f9fafb;
    --text-secondary: #9ca3af;
    --active: #818cf8;
    --border: #374151;
    --shadow: rgba(0, 0, 0, 0.3);
    --accent-bg: #374151;
}

body {
    font-family: 'Nunito', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--background);
    color: var(--text);
    min-height: 100vh;
    padding: 0 1rem 2rem;
    padding-top: 120px;
}

.theme-toggle-container {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 2px 8px var(--shadow);
    z-index: 1000;
    padding: 1rem 2rem;
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-container {
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.css-logo {
    display: flex;
    align-items: center;
    justify-content: center;
}

.sound-wave {
    display: flex;
    align-items: center;
    gap: 4px;
    height: 50px;
}

.sound-wave .bar {
    width: 6px;
    border-radius: 3px;
    transition: all 0.3s ease;
    animation: none;
}

.sound-wave.playing .bar {
    animation: wave 2s ease-in-out infinite;
}

.sound-wave .bar-1 {
    height: 20px;
    background: #6366f1;
    animation-delay: 0s;
}

.sound-wave .bar-2 {
    height: 35px;
    background: #7c3aed;
    animation-delay: 0.1s;
}

.sound-wave .bar-3 {
    height: 50px;
    background: #8b5cf6;
    animation-delay: 0.2s;
}

.sound-wave .bar-4 {
    height: 30px;
    background: #a855f7;
    animation-delay: 0.3s;
}

.sound-wave .bar-5 {
    height: 15px;
    background: #c084fc;
    animation-delay: 0.4s;
}

@keyframes wave {
    0%, 100% {
        transform: scaleY(1);
    }
    50% {
        transform: scaleY(0.6);
    }
}

.css-logo:hover .bar {
    background: var(--active);
}

[data-theme="dark"] h1 {
    background: linear-gradient(135deg, #818cf8, #a78bfa, #f472b6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

[data-theme="dark"] .sound-wave .bar-1 {
    background: #818cf8;
}

[data-theme="dark"] .sound-wave .bar-2 {
    background: #8b5cf6;
}

[data-theme="dark"] .sound-wave .bar-3 {
    background: #a78bfa;
}

[data-theme="dark"] .sound-wave .bar-4 {
    background: #c084fc;
}

[data-theme="dark"] .sound-wave .bar-5 {
    background: #d8b4fe;
}

[data-theme="dark"] .css-logo:hover .bar-1 {
    background: #a5b4fc;
}

[data-theme="dark"] .css-logo:hover .bar-2 {
    background: #a78bfa;
}

[data-theme="dark"] .css-logo:hover .bar-3 {
    background: #c084fc;
}

[data-theme="dark"] .css-logo:hover .bar-4 {
    background: #d8b4fe;
}

[data-theme="dark"] .css-logo:hover .bar-5 {
    background: #e9d5ff;
}

[data-theme="dark"] .sound-toggle.active {
    background: rgba(129, 140, 248, 0.15);
}

[data-theme="dark"] .sound-toggle:hover {
    background: var(--accent-bg);
}

[data-theme="dark"] .sound-toggle.active .label {
    color: var(--primary);
}

[data-theme="dark"] .sound-card:hover {
    border-color: var(--primary);
    box-shadow: 0 2px 8px rgba(129, 140, 248, 0.2);
}

[data-theme="dark"] .preset-btn.active {
    background: linear-gradient(135deg, #818cf8, #a78bfa);
    box-shadow: 0 2px 6px rgba(129, 140, 248, 0.4);
}

[data-theme="dark"] .category-header {
    color: var(--text-secondary);
}

.header-title-group {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

h1 {
    font-family: 'Exo 2', 'Nunito', sans-serif;
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    margin: 0;
    background: linear-gradient(135deg, #6366f1, #8b5cf6, #ec4899);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 400;
    margin: 0;
}

.theme-toggle {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border);
    padding: 0.5rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
}

.theme-toggle:hover {
    color: var(--text);
    border-color: var(--primary);
}

.theme-icon {
    line-height: 1;
}

.about-btn,
.privacy-btn {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border);
    padding: 0.5rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
}

.about-btn:hover,
.privacy-btn:hover {
    color: var(--text);
    border-color: var(--primary);
}

.about-btn .icon,
.privacy-btn .icon {
    line-height: 1;
}

.global-controls {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
}

.presets {
    background: var(--surface);
    border-radius: 8px;
    padding: 1.5rem;
    border: 1px solid var(--border);
    box-shadow: 0 2px 4px var(--shadow);
    flex-shrink: 0;
    width: 250px;
}

.presets h2 {
    font-size: 0.875rem;
    margin: 0;
    padding-bottom: 16px;
    color: var(--text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.preset-controls {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.master-volume-control {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.375rem 0.75rem;
    background: var(--background-alt);
    border: 1px solid var(--border);
    border-radius: 6px;
    transition: all 0.3s ease;
    position: relative;
}

.master-volume-control.loading {
    background: linear-gradient(90deg, 
        var(--accent-bg) 0%, 
        rgba(99, 102, 241, 0.15) 50%, 
        var(--accent-bg) 100%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-color: var(--primary);
}

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

[data-theme="dark"] .master-volume-control.loading {
    background: linear-gradient(90deg, 
        var(--accent-bg) 0%, 
        rgba(129, 140, 248, 0.2) 50%, 
        var(--accent-bg) 100%);
    background-size: 200% 100%;
}

.master-volume-control label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    white-space: nowrap;
}

.master-volume-control input[type="range"] {
    width: 80px;
    height: 4px;
}

.master-volume-control span {
    font-size: 0.75rem;
    color: var(--text);
    font-weight: 600;
    min-width: 2rem;
    text-align: right;
}

.mute-btn,
.reset-btn {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border);
    padding: 0.375rem 0.625rem;
    border-radius: 6px;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 400;
    transition: all 0.2s ease;
    line-height: 1;
}

.mute-btn:hover,
.reset-btn:hover {
    background: var(--background);
    color: var(--text);
    border-color: var(--primary);
}

.mute-btn:active,
.reset-btn:active {
    transform: scale(0.98);
}

.mute-btn.muted {
    background: var(--primary);
    color: var(--text);
    border-color: var(--primary);
}

.mute-btn.muted:hover {
    background: var(--primary-hover);
    border-color: var(--primary-hover);
}

.preset-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.preset-btn {
    background: var(--accent-bg);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    padding: 0.625rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 400;
    transition: all 0.2s ease;
    width: 100%;
    text-align: left;
}

.preset-btn:hover {
    background: var(--surface);
    color: var(--text);
    border-color: var(--primary);
    box-shadow: 0 1px 3px var(--shadow);
}

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

.preset-btn.active {
    background: linear-gradient(135deg, var(--primary), #8b5cf6);
    color: white;
    border-color: var(--active);
    box-shadow: 0 2px 6px rgba(99, 102, 241, 0.3);
}

.sound-grid-wrapper {
    flex: 1;
    min-width: 0;
}

.category-header-with-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    margin: 0 0 1rem 0;
}

.size-control {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 6px;
    flex-shrink: 0;
}

.size-control label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    white-space: nowrap;
}

.size-control input[type="range"] {
    width: 100px;
    height: 4px;
}

.size-control span {
    font-size: 0.75rem;
    color: var(--text);
    font-weight: 600;
    min-width: 2.5rem;
    text-align: right;
}

.category-header {
    font-size: 0.875rem;
    color: var(--primary);
    font-weight: 600;
    margin: 2rem 0 0 0;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.category-header-with-controls .category-header {
    margin: 0;
}

.category-header:not(.category-header-with-controls .category-header) {
    margin: 2rem 0 1rem 0;
}

.category-header:first-of-type {
    margin-top: 0;
}

.sound-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.sound-card {
    background: var(--surface);
    border-radius: 6px;
    padding: calc(0.875rem * var(--card-size-scale));
    border: 1px solid var(--border);
    transition: all 0.2s ease;
    box-shadow: 0 1px 3px var(--shadow);
}

.sound-card:hover {
    box-shadow: 0 2px 8px var(--shadow);
    border-color: var(--primary);
    transform: translateY(-1px);
}

.sound-toggle {
    width: 100%;
    background: transparent;
    border: none;
    border-radius: 4px;
    padding: calc(0.625rem * var(--card-size-scale));
    cursor: pointer;
    font-family: inherit;
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: calc(0.375rem * var(--card-size-scale));
    margin-bottom: calc(0.625rem * var(--card-size-scale));
}

.sound-toggle:hover {
    background: var(--accent-bg);
}

.sound-toggle.active {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.08), rgba(139, 92, 246, 0.08));
    border-radius: 6px;
}

.sound-toggle .icon {
    font-size: calc(1.5rem * var(--card-size-scale));
    opacity: 0.8;
    transition: opacity 0.2s ease;
}

.sound-toggle.active .icon {
    opacity: 1;
}

.sound-toggle .label {
    font-size: calc(0.8125rem * var(--card-size-scale));
    font-weight: 400;
    color: var(--text-secondary);
    text-align: center;
    line-height: 1.2;
}

.sound-toggle.active .label {
    color: var(--primary);
    font-weight: 500;
}

.volume-control {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    position: relative;
}

.volume-value {
    font-size: 0.875rem;
    color: var(--text);
    min-width: 32px;
    text-align: right;
    font-variant-numeric: tabular-nums;
    font-weight: 500;
}

.volume-slider {
    flex: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 4px;
    background: var(--border);
    border-radius: 2px;
    outline: none;
    cursor: pointer;
}

.volume-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    background: var(--primary);
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.2s ease;
}

.volume-slider::-webkit-slider-thumb:hover {
    background: var(--primary-hover);
}

.volume-slider::-moz-range-thumb {
    width: 14px;
    height: 14px;
    background: var(--primary);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    transition: all 0.2s ease;
}

.volume-slider::-moz-range-thumb:hover {
    background: var(--primary-hover);
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(8px);
}

.modal-content {
    background: var(--surface);
    margin: 5% auto;
    padding: 1.5rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    width: 90%;
    max-width: 560px;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    animation: slideIn 0.2s ease;
}

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

.close {
    color: var(--text-secondary);
    float: right;
    font-size: 1.5rem;
    font-weight: 300;
    cursor: pointer;
    transition: color 0.2s ease;
    line-height: 1;
}

.close:hover {
    color: var(--text);
}

.modal-content h2 {
    color: var(--text);
    margin-bottom: 1rem;
    font-size: 1.5rem;
    font-weight: 400;
}

.modal-content h3 {
    color: var(--text);
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    font-size: 1rem;
    font-weight: 500;
}

.modal-content p {
    line-height: 1.6;
    margin-bottom: 1rem;
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.modal-content ul {
    list-style-position: inside;
    margin-left: 1rem;
    margin-bottom: 1rem;
}

.modal-content li {
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 0.9375rem;
}

.modal-content .tip {
    background: var(--background);
    padding: 1rem;
    border-radius: 6px;
    border-left: 2px solid var(--primary);
    margin-top: 1.5rem;
}

.modal-content a {
    color: var(--active);
    text-decoration: none;
    transition: opacity 0.2s ease;
}

.modal-content a:hover {
    opacity: 0.8;
    text-decoration: underline;
}

.modal-content .feedback-link {
    background: var(--background);
    padding: 0.75rem 1rem;
    border-radius: 6px;
    margin-bottom: 1.5rem;
    border-left: 3px solid var(--active);
    color: var(--text);
}

.modal-content .privacy-link {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--accent-bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    text-decoration: none;
    transition: all 0.2s ease;
}

.modal-content .privacy-link:hover {
    background: var(--surface);
    border-color: var(--primary);
    box-shadow: 0 1px 3px var(--shadow);
    text-decoration: none;
    opacity: 1;
}

/* Loading Indicator */
.loading-indicator {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 2rem;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    display: none;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    z-index: 2000;
    min-width: 200px;
}

.loading-indicator.show {
    display: flex;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border);
    border-top-color: var(--active);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-text {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    margin: 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: 0 0.75rem 1rem;
        padding-top: 110px;
    }

    h1 {
        font-size: 1.25rem;
    }

    .subtitle {
        font-size: 0.875rem;
    }

    .header {
        padding: 0.75rem 1rem;
    }

    .header-content {
        flex-direction: column;
        gap: 0.75rem;
    }

    .header-left {
        width: 100%;
        justify-content: center;
        gap: 0.75rem;
    }

    .logo-container {
        height: 40px;
    }

    .sound-wave {
        height: 40px;
    }

    .global-controls {
        width: 100%;
        gap: 0.5rem;
        justify-content: space-between;
    }

    .theme-toggle-container {
        display: flex;
        gap: 0.5rem;
    }

    .theme-toggle,
    .about-btn,
    .privacy-btn {
        flex: 0 0 auto;
    }

    .mute-btn,
    .reset-btn {
        flex: 0 0 auto;
    }

    .master-volume-control {
        flex: 1;
        min-width: 0;
    }

    .master-volume-control input[type="range"] {
        flex: 1;
        min-width: 60px;
    }

    .category-header-with-controls {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }

    .size-control {
        width: 100%;
        justify-content: space-between;
    }

    .size-control input[type="range"] {
        flex: 1;
        max-width: 150px;
    }

    .sound-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.625rem;
    }

    .sound-card {
        padding: calc(0.625rem * var(--card-size-scale));
    }

    .sound-toggle {
        padding: calc(0.5rem * var(--card-size-scale));
        margin-bottom: calc(0.5rem * var(--card-size-scale));
        touch-action: manipulation;
    }

    .sound-toggle .icon {
        font-size: calc(1.25rem * var(--card-size-scale));
    }

    .sound-toggle .label {
        font-size: calc(0.75rem * var(--card-size-scale));
    }

    .volume-control {
        gap: 0.5rem;
    }

    .volume-value {
        font-size: 0.75rem;
        min-width: 24px;
    }

    .volume-slider {
        height: 3px;
    }

    .volume-slider::-webkit-slider-thumb {
        width: 12px;
        height: 12px;
    }

    .volume-slider::-moz-range-thumb {
        width: 12px;
        height: 12px;
    }

    .container {
        flex-direction: column;
    }

    .presets {
        width: 100%;
        position: static;
    }

    .preset-buttons {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .preset-btn {
        flex: 1;
        min-width: 140px;
    }

    .sound-grid-wrapper {
        width: 100%;
    }

    .modal-content {
        margin: 15% auto;
        padding: 1.5rem;
        width: 95%;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.25rem;
    }

    .master-volume-control span {
        display: none;
    }

    .sound-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.5rem;
    }

    .sound-card {
        padding: calc(0.5rem * var(--card-size-scale));
    }

    .sound-toggle {
        padding: calc(0.375rem * var(--card-size-scale));
        margin-bottom: calc(0.375rem * var(--card-size-scale));
    }

    .sound-toggle .icon {
        font-size: calc(1.125rem * var(--card-size-scale));
    }

    .sound-toggle .label {
        font-size: calc(0.6875rem * var(--card-size-scale));
    }
}