@font-face {
    font-family: 'SF Pro Text';
    src: url('fonts/sf-pro-text-medium.woff2') format('woff2');
    font-weight: 400 500;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'SF Pro Text';
    src: url('fonts/sf-pro-text-bold.woff2') format('woff2');
    font-weight: 600 700;
    font-style: normal;
    font-display: swap;
}

:root {
    --color-primary: #007aff;
    --color-primary-hover: #005ecb;
    --color-primary-light: #5eb8ff;
    --color-secondary: #34c759;
    --color-secondary-hover: #2ca048;
    --color-background: #f0f2f5;
    --color-surface: #ffffff;
    --color-text-dark: #1c1c1e;
    --color-text-medium: #6c6c70;
    --color-text-light: #8e8e93;
    --color-border: #e0e0e0;
    --color-border-hover: #c0c0c0;
    --color-success: #34c759;
    --color-error: #ff3b30;
    --color-warning: #ff9500;

    --font-family: 'SF Pro Text', -apple-system, BlinkMacSystemFont, 'Segoe UI',
        Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;

    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    --font-size-xs: 0.75rem;
    --font-size-sm: 0.85rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.05rem;
    --font-size-xl: 1.1rem;
    --font-size-2xl: 1.25rem;
    --font-size-3xl: 1.5rem;

    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 2.5rem;

    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 12px 24px rgba(0, 0, 0, 0.15);
    --shadow-2xl: 0 16px 32px rgba(0, 0, 0, 0.2);

    --transition-fast: 0.15s ease;
    --transition-base: 0.2s ease;
    --transition-slow: 0.3s ease;
    --transition-smooth: cubic-bezier(0.4, 0, 0.2, 1);

    --z-base: 1;
    --z-dropdown: 100;
    --z-modal: 1000;
    --z-tooltip: 1100;
}

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

body {
    font-family: var(--font-family);
    font-weight: var(--font-weight-normal);
    font-size: var(--font-size-base);
    background-color: var(--color-background);
    color: var(--color-text-dark);
    display: block;
    min-height: 100vh;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-family);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-dark);
    line-height: 1.2;
    margin: 0;
}

h1 {
    font-size: clamp(var(--font-size-3xl), 4vw, var(--font-size-3xl) * 1.33);
    margin-bottom: 0.75rem;
}

h2 {
    font-size: var(--font-size-2xl);
    margin-top: 0;
}

p {
    color: var(--color-text-medium);
    margin-bottom: var(--spacing-lg);
    line-height: 1.5;
}

.note {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    margin-top: -1rem;
    margin-bottom: var(--spacing-lg);
    font-style: italic;
    line-height: 1.4;
}

.container {
    background-color: var(--color-surface);
    padding: clamp(var(--spacing-lg), 5vw, var(--spacing-2xl));
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    text-align: center;
    max-width: 550px;
    width: 100%;
    margin-bottom: var(--spacing-xl);
}

.separator {
    width: 60%;
    max-width: 400px;
    border: none;
    border-top: 1px solid var(--color-border);
    margin: var(--spacing-xl) 0;
}

.file-input-container {
    margin-bottom: var(--spacing-lg);
    text-align: left;
}

.file-input-container label:not([for="customReferenceCheckbox"]) {
    display: block;
    text-align: left;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-dark);
    font-weight: var(--font-weight-bold);
    font-family: var(--font-family);
}

.drop-zone {
    width: 100%;
    height: 160px;
    border: 2px dashed #cbd5e1;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    background: rgba(255, 255, 255, 0.5);
    position: relative;
    overflow: hidden;
    margin-bottom: var(--spacing-lg);
}

.drop-zone:hover,
.drop-zone.drag-over {
    border-color: var(--color-primary);
    background: rgba(0, 122, 255, 0.05);
}

.drop-zone.active {
    background: rgba(52, 199, 89, 0.08);
    border-color: var(--color-success);
    border-style: solid;
}

.drop-zone-content {
    text-align: center;
    pointer-events: none;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: 20px;
}

.upload-icon {
    color: var(--color-text-medium);
    margin-bottom: 10px;
    transition: color 0.2s;
    width: 48px;
    height: 48px;
}

.drop-zone:hover .upload-icon,
.drop-zone.drag-over .upload-icon {
    color: var(--color-primary);
}

.drop-zone.active .upload-icon {
    color: var(--color-success);
}

.drop-text {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-dark);
    margin: 0;
    font-family: var(--font-family);
}

.drop-zone.active .drop-text {
    color: var(--color-text-dark);
}

.drop-subtext {
    font-size: 0.85rem;
    color: var(--color-text-medium);
    margin: 5px 0 0 0;
}

.drop-zone input[type="file"] {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
    z-index: var(--z-base);
}

#customReferenceCheckbox {
    margin-right: var(--spacing-sm);
    transform: scale(1.1);
    cursor: pointer;
    accent-color: var(--color-primary);
}

.file-input-container label[for="customReferenceCheckbox"] {
    font-weight: var(--font-weight-medium);
    display: inline-block;
    cursor: pointer;
    color: var(--color-text-dark);
    user-select: none;
}

.file-input-container:has(#customReferenceCheckbox) .note {
    margin-top: 0.7rem;
}

button {
    background-color: var(--color-primary);
    color: var(--color-surface);
    border: none;
    padding: 0.85rem 1.75rem;
    border-radius: var(--radius-lg);
    font-size: var(--font-size-lg);
    font-family: var(--font-display);
    font-weight: var(--font-weight-bold);
    cursor: pointer;
    width: auto;
    max-width: 300px;
    transition: background-color var(--transition-slow),
        transform var(--transition-base),
        box-shadow var(--transition-base);
    white-space: nowrap;
    user-select: none;
}

button:hover {
    background-color: var(--color-primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

button:active {
    transform: scale(0.98);
    box-shadow: none;
}

button:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
}

#result,
#restoreResult {
    margin-top: var(--spacing-xl);
    text-align: left;
}

.gradient-list-container {
    margin: 20px 0;
    text-align: left;
    border-top: 1px solid var(--color-border);
    padding-top: 15px;
}

.gradient-list-container h3 {
    font-size: 1rem;
    margin: 0;
    color: var(--color-text-dark);
}

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

.select-all-container {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    color: var(--color-primary);
    cursor: pointer;
    user-select: none;
}

.select-all-container input {
    accent-color: var(--color-primary);
    cursor: pointer;
}

.gradient-list {
    max-height: 200px;
    overflow-y: auto;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 10px;
    background: #fafafa;
}

.gradient-list::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

.gradient-list::-webkit-scrollbar-track {
    background: transparent;
}

.gradient-list::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.1);
    border-radius: 3px;
}

.gradient-list::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 0, 0, 0.2);
}

.gradient-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 0;
    border-bottom: 1px solid #eee;
}

.gradient-item:last-child {
    border-bottom: none;
}

.gradient-item label {
    font-size: 0.9rem;
    color: var(--color-text-dark);
    cursor: pointer;
    user-select: none;
    flex: 1;
}

.gradient-item input[type="checkbox"] {
    cursor: pointer;
    accent-color: var(--color-primary);
}

.result-card {
    background: #ffffff;
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 24px;
    margin-top: 24px;
    text-align: center;
    box-shadow: var(--shadow-md);
    animation: slideUp 0.3s ease-out;
}

.result-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-bottom: 20px;
    color: var(--color-success);
    font-weight: 700;
    font-size: 1.1rem;
}

.result-stats {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-bottom: 24px;
    padding: 15px;
    background: var(--color-background);
    border-radius: 12px;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text-dark);
    line-height: 1.2;
}

.stat-label {
    font-size: 0.8rem;
    color: var(--color-text-medium);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
    margin-top: 4px;
}

.result-actions {
    display: flex;
    justify-content: center;
    gap: 12px;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

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

#downloadLink,
#restoreDownloadLink {
    display: inline-block;
    background-color: var(--color-secondary);
    color: var(--color-surface);
    padding: 0.85rem 1.75rem;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: var(--font-weight-bold);
    font-family: var(--font-family);
    transition: background-color var(--transition-slow),
        transform var(--transition-base),
        box-shadow var(--transition-base);
    width: auto;
    max-width: none;
    font-size: var(--font-size-xl);
    user-select: none;
}

#downloadLink:hover,
#restoreDownloadLink:hover {
    background-color: var(--color-secondary-hover);
    transform: scale(1.03);
    box-shadow: var(--shadow-md);
}

#downloadLink:active,
#restoreDownloadLink:active {
    transform: scale(0.98);
}

#downloadLink:focus-visible,
#restoreDownloadLink:focus-visible {
    outline: 2px solid var(--color-secondary);
    outline-offset: 2px;
}

.modal {
    opacity: 0;
    visibility: hidden;
    position: fixed;
    z-index: var(--z-modal);
    inset: 0;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    transition: opacity var(--transition-slow) ease,
        visibility var(--transition-slow) ease;
}

.modal.show {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    padding: 25px;
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 400px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
    text-align: center;
}

.modal.show .modal-content {
    animation: modalSlideIn 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes modalSlideIn {
    0% {
        opacity: 0;
        transform: translate(-50%, -46%) scale(0.96);
    }

    100% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1);
    }
}

.modal.closing {
    opacity: 0;
}

.modal.closing .modal-content {
    animation: modalSlideOut 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes modalSlideOut {
    0% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1);
    }

    100% {
        opacity: 0;
        transform: translate(-50%, -46%) scale(0.96);
    }
}

.modal-content h2 {
    color: var(--color-primary);
    margin-bottom: 12px;
    font-family: var(--font-family);
}

.modal-content p {
    color: var(--color-text-dark);
    margin-bottom: 20px;
}

.close-button {
    color: var(--color-text-light);
    float: right;
    font-size: 28px;
    font-weight: var(--font-weight-bold);
    cursor: pointer;
    line-height: 1;
    transition: color var(--transition-base);
    user-select: none;
}

.close-button:hover,
.close-button:focus {
    color: var(--color-text-dark);
}

.format-options {
    display: flex;
    gap: 10px;
}

.format-options button {
    flex: 1;
    margin: 0;
    padding: 0.75rem;
    font-size: var(--font-size-base);
    background-color: var(--color-secondary);
    max-width: none;
}

.format-options button:hover {
    background-color: var(--color-secondary-hover);
}

.no-scroll {
    overflow: hidden;
    padding-right: 15px;
}

@media (max-width: 768px) {
    body {
        padding: var(--spacing-lg);
    }

    .container {
        padding: var(--spacing-xl);
    }
}

@media (max-width: 480px) {
    body {
        padding: var(--spacing-md);
    }

    .container {
        padding: var(--spacing-lg);
        margin-bottom: var(--spacing-lg);
    }

    h1 {
        font-size: var(--font-size-2xl);
    }

    button,
    #downloadLink,
    #restoreDownloadLink {
        padding: 0.75rem 1.5rem;
        font-size: var(--font-size-base);
        max-width: none;
    }

    .separator {
        width: 80%;
        margin: var(--spacing-lg) 0;
    }

    .modal-content {
        width: 95%;
        padding: 20px;
    }

    .format-options {
        flex-direction: column;
    }

    .format-options button {
        width: 100%;
    }
}

@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}



#mobile-warning {
    display: none;
    position: fixed;
    inset: 0;
    background: var(--color-background);
    z-index: 9999;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-xl);
}

.warning-content h2 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.main-layout {
    display: flex;
    max-width: none;
    margin: 0;
    align-items: stretch;
    justify-content: flex-start;
    min-height: 100vh;
}

.content-panel {
    flex: 1;
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-xl);
}

#player-panel {
    width: 450px;
    min-width: 450px;
    background-color: #F9FAFC;
    border-right: 1px solid var(--color-border);
    padding: var(--spacing-lg);
    border-radius: 0;
    box-shadow: 4px 0 24px rgba(0, 0, 0, 0.08);
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    z-index: 100;
}

#player-panel h1 {
    width: fit-content;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    padding-bottom: 10px;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

#anim {
    width: 100%;
    aspect-ratio: 1 / 1;
    background: #ffffff;
    background-image:
        linear-gradient(45deg, #f0f0f0 25%, transparent 25%),
        linear-gradient(-45deg, #f0f0f0 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #f0f0f0 75%),
        linear-gradient(-45deg, transparent 75%, #f0f0f0 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    margin: var(--spacing-md) 0;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.05);
}

#controls {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

#controls div:first-child {
    display: flex;
    margin-bottom: 10px;
    gap: 10px;
    justify-content: center;
}

input[type=range] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    background: transparent;
    cursor: pointer;
}

input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none;
    height: 16px;
    width: 16px;
    border-radius: 50%;
    background: var(--color-primary);
    margin-top: -6px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

input[type=range]::-webkit-slider-runnable-track {
    width: 100%;
    height: 4px;
    background: #e5e7eb;
    border-radius: 2px;
}

#frameLabel {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: var(--font-size-sm);
    color: var(--color-text-medium);
    font-weight: var(--font-weight-semibold);
}

#frameInput {
    width: 60px;
    padding: 4px 8px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    text-align: center;
    font-family: var(--font-family);
    font-weight: var(--font-weight-semibold);
}

#frameInput:focus {
    outline: 2px solid var(--color-primary);
    border-color: var(--color-primary);
}

@media (max-width: 1024px) {
    .main-layout {
        display: none;
    }

    #mobile-warning {
        display: flex;
    }
}