/* HGL product surface: restrained Apple-inspired layer over the legacy component styles. */
:root {
    --apple-blue: #0071e3;
    --apple-blue-hover: #0077ed;
    --apple-green: #34c759;
    --apple-bg: #f5f5f7;
    --apple-surface: rgba(255, 255, 255, 0.88);
    --apple-surface-solid: #ffffff;
    --apple-border: rgba(60, 60, 67, 0.16);
    --apple-divider: rgba(60, 60, 67, 0.12);
    --apple-text: #1d1d1f;
    --apple-secondary: #6e6e73;
    --apple-tertiary: #86868b;
    --apple-shadow: 0 12px 28px rgba(0, 0, 0, 0.06);
    --apple-shadow-float: 0 18px 44px rgba(0, 0, 0, 0.1);
    --apple-radius: 14px;
    --apple-radius-small: 10px;
    --apple-ease-out: cubic-bezier(0.23, 1, 0.32, 1);
    --apple-ease-in-out: cubic-bezier(0.77, 0, 0.175, 1);
    --apple-duration-fast: 140ms;
    --apple-duration: 200ms;
}

html,
body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Segoe UI", sans-serif;
    color: var(--apple-text);
    background: var(--apple-bg);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

button,
a,
input,
select,
textarea {
    transition-property: transform, opacity, color, background-color, border-color, box-shadow, outline-color !important;
    transition-duration: var(--apple-duration-fast) !important;
    transition-timing-function: var(--apple-ease-out) !important;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 3px solid rgba(0, 113, 227, 0.38);
    outline-offset: 3px;
}

body {
    line-height: 1.5;
    background-image: none;
}

.unified-navbar,
.navbar {
    background: rgba(245, 245, 247, 0.78) !important;
    border-bottom: 1px solid var(--apple-divider) !important;
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.5) !important;
    backdrop-filter: blur(18px) saturate(1.2);
    -webkit-backdrop-filter: blur(18px) saturate(1.2);
}

.navbar-container {
    max-width: 1120px;
}

.navbar-brand {
    color: var(--apple-text) !important;
    font-size: 1rem;
    font-weight: 650;
    letter-spacing: -0.01em;
    transition: opacity var(--apple-duration-fast) ease-out;
}

.navbar-brand-text {
    background: none !important;
    color: inherit !important;
    -webkit-text-fill-color: currentColor !important;
}

.navbar-brand-img {
    width: auto;
    max-width: 34px;
    object-fit: contain;
}

.nav-link,
.nav-link-right,
.theme-toggle-btn,
.mobile-menu-link {
    transition: color var(--apple-duration-fast) ease-out, background-color var(--apple-duration-fast) ease-out, transform var(--apple-duration-fast) var(--apple-ease-out);
}

.mobile-menu {
    right: 0 !important;
    transform: translateX(100%);
    transition: transform var(--apple-duration) var(--apple-ease-out) !important;
}

.mobile-menu.open {
    right: 0 !important;
    transform: translateX(0);
}

.nav-link.active,
.nav-link-right.active {
    color: var(--apple-blue) !important;
    background: rgba(0, 113, 227, 0.1) !important;
}

.container {
    max-width: 1040px;
    margin: 0 auto;
    overflow: visible;
}

.header {
    text-align: left;
    padding: 56px 28px 26px;
}

.header::after {
    display: none;
}

.header h1 {
    margin: 0 0 10px;
    color: var(--apple-text);
    font-size: clamp(2.25rem, 5vw, 4rem);
    line-height: 1.05;
    font-weight: 700;
    letter-spacing: -0.055em;
    background: none;
    -webkit-text-fill-color: currentColor;
}

.header h1::before {
    content: none;
    animation: none;
}

.header h1.header-logo-img::before {
    content: "";
    display: inline-block;
    width: 42px;
    height: 42px;
    margin: 0 12px 0 0;
    vertical-align: -4px;
    background-image: var(--logo-header-url);
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
}

.header p {
    max-width: 600px;
    color: var(--apple-secondary);
    font-size: 1.05rem;
    line-height: 1.55;
    letter-spacing: 0;
    opacity: 1;
}

.content {
    padding: 0 28px 64px;
}

.file-upload-section,
.encoding-text-manager,
.settings-section,
.chapters-preview,
.chapter-filter-section,
.result,
.progress {
    background: var(--apple-surface) !important;
    border: 1px solid var(--apple-border) !important;
    border-radius: var(--apple-radius) !important;
    box-shadow: var(--apple-shadow) !important;
}

.file-upload-section {
    min-height: 196px;
    padding: 28px 30px !important;
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 18px;
    text-align: left;
    border-style: solid !important;
    border-color: rgba(0, 113, 227, 0.22) !important;
    transition: border-color var(--apple-duration) ease-out, background-color var(--apple-duration) ease-out, transform var(--apple-duration) var(--apple-ease-out), box-shadow var(--apple-duration) ease-out;
}

.file-upload-section:hover {
    background: var(--apple-surface-solid) !important;
    border-color: rgba(0, 113, 227, 0.42) !important;
    box-shadow: var(--apple-shadow-float) !important;
    transform: translateY(-2px);
}

.file-upload-section.dragover {
    background: rgba(232, 241, 255, 0.96) !important;
    border-color: var(--apple-blue) !important;
    box-shadow: 0 0 0 4px rgba(0, 113, 227, 0.12), var(--apple-shadow-float) !important;
    transform: none;
}

.upload-icon {
    width: 52px !important;
    height: 52px !important;
    line-height: 52px !important;
    margin: 0 !important;
    border-radius: 15px !important;
    background: #e8f1ff !important;
    color: var(--apple-blue);
    box-shadow: none !important;
    font-size: 1.7rem !important;
}

.file-upload-section h3 {
    margin: 2px 0 5px !important;
    color: var(--apple-text);
    font-size: 1.25rem;
    font-weight: 650;
    letter-spacing: -0.02em;
}

.file-upload-section p {
    margin: 0 !important;
    color: var(--apple-secondary);
    font-size: 0.92rem;
}

.btn-base,
.upload-btn,
.btn-primary,
.btn-secondary,
.btn-action,
.convert-btn,
.download-btn,
.action-btn,
.control-btn,
.filter-apply-btn,
.preset-btn,
.btn-edit,
.btn-readonly,
.btn-save,
.btn-confirm-encoding {
    border-radius: var(--apple-radius-small) !important;
    font-family: inherit;
    font-weight: 600;
    letter-spacing: -0.01em;
    transition: transform var(--apple-duration-fast) var(--apple-ease-out), background-color var(--apple-duration-fast) ease-out, border-color var(--apple-duration-fast) ease-out, color var(--apple-duration-fast) ease-out, box-shadow var(--apple-duration-fast) ease-out !important;
}

.btn-base:active,
.upload-btn:active,
.btn-primary:active,
.btn-secondary:active,
.btn-action:active,
.convert-btn:active,
.download-btn:active,
.action-btn:active,
.control-btn:active {
    transform: scale(0.97) !important;
}

.btn-primary,
.btn-action,
.convert-btn,
.upload-btn {
    background: var(--apple-blue) !important;
    border: 1px solid var(--apple-blue) !important;
    color: #fff !important;
    box-shadow: 0 6px 14px rgba(0, 113, 227, 0.2) !important;
    background-image: none !important;
}

.btn-primary:hover:not(:disabled),
.btn-action:hover:not(:disabled),
.convert-btn:hover:not(:disabled),
.upload-btn:hover:not(:disabled) {
    background: var(--apple-blue-hover) !important;
    transform: translateY(-1px);
    box-shadow: 0 9px 18px rgba(0, 113, 227, 0.24) !important;
}

.btn-primary::before,
.btn-action::before,
.convert-btn::before,
.upload-btn::before {
    display: none !important;
    animation: none !important;
}

.btn-secondary,
.action-btn,
.control-btn,
.preset-btn,
.btn-edit,
.btn-readonly,
.btn-save,
.btn-confirm-encoding {
    background: rgba(118, 118, 128, 0.12) !important;
    border: 1px solid transparent !important;
    color: var(--apple-text) !important;
    box-shadow: none !important;
}

.btn-secondary:hover:not(:disabled),
.action-btn:hover:not(:disabled),
.control-btn:hover:not(:disabled),
.preset-btn:hover:not(:disabled),
.btn-edit:hover:not(:disabled),
.btn-readonly:hover:not(:disabled),
.btn-save:hover:not(:disabled),
.btn-confirm-encoding:hover:not(:disabled) {
    background: rgba(118, 118, 128, 0.2) !important;
    border-color: transparent !important;
    transform: translateY(-1px);
}

.btn-success,
.download-btn {
    background: var(--apple-green) !important;
    border: 1px solid var(--apple-green) !important;
    box-shadow: 0 6px 14px rgba(52, 199, 89, 0.2) !important;
    background-image: none !important;
}

.btn-success:hover:not(:disabled),
.download-btn:hover:not(:disabled) {
    background: #2fba53 !important;
    transform: translateY(-1px);
}

.settings-section,
.encoding-text-manager {
    margin-top: 18px !important;
    overflow: clip;
}

.settings-section > h3,
#settingsTitle {
    margin: 0 !important;
    padding: 22px 24px 10px;
    color: var(--apple-text);
    font-size: 1.15rem;
    font-weight: 650;
    letter-spacing: -0.02em;
}

.section-header,
.repair-header,
.cover-settings-section > .section-header,
.custom-styles-section > .section-header {
    min-height: 54px;
    padding: 15px 20px !important;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--apple-text);
    background: rgba(118, 118, 128, 0.08) !important;
    border-bottom: 1px solid var(--apple-divider);
    cursor: pointer;
    transition: background-color var(--apple-duration-fast) ease-out;
}

.section-header:hover,
.repair-header:hover {
    background: rgba(118, 118, 128, 0.13) !important;
}

.collapse-indicator {
    color: var(--apple-tertiary);
    font-size: 0.82rem;
    transition: transform var(--apple-duration) var(--apple-ease-out);
}

.encoding-title,
.repair-title,
.section-header h3,
.cover-settings-section .section-header h3 {
    color: var(--apple-text) !important;
    font-size: 1rem !important;
    font-weight: 650 !important;
}

.encoding-badge,
.repair-badge,
.beta-badge,
.beta-badge-mini {
    margin-left: auto;
    padding: 4px 9px !important;
    border-radius: 999px !important;
    background: rgba(52, 199, 89, 0.14) !important;
    color: #248a3d !important;
    box-shadow: none !important;
    font-size: 0.72rem !important;
    letter-spacing: 0;
}

.manager-content,
.basic-info-content,
.cover-settings-content,
.styles-content,
.filter-content {
    padding: 22px 24px !important;
    background: transparent !important;
}

.form-group,
.style-group {
    margin-bottom: 20px;
}

.form-label,
.form-group label,
.style-group label {
    margin-bottom: 8px;
    color: var(--apple-text);
    font-size: 0.92rem;
    font-weight: 600;
}

.form-input,
.form-select,
.form-textarea,
.form-group input,
.form-group select,
.form-group textarea,
.select-input,
.template-input,
.filename-preview-input,
.chapter-template-select,
.filter-number-input,
.title-length-input {
    min-height: 42px;
    padding: 10px 12px !important;
    border: 1px solid var(--apple-border) !important;
    border-radius: var(--apple-radius-small) !important;
    background: var(--apple-surface-solid) !important;
    color: var(--apple-text) !important;
    transition: border-color var(--apple-duration-fast) ease-out, box-shadow var(--apple-duration-fast) ease-out, background-color var(--apple-duration-fast) ease-out !important;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus,
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus,
.select-input:focus,
.template-input:focus,
.filename-preview-input:focus,
.chapter-template-select:focus {
    border-color: var(--apple-blue) !important;
    box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.16) !important;
    outline: none !important;
}

.help-text,
.description-text,
.multi-select-desc,
.repair-desc,
.header-subtitle,
.filter-footer {
    color: var(--apple-secondary) !important;
    font-size: 0.86rem;
    line-height: 1.55;
}

.switch-label {
    width: 48px !important;
    height: 28px !important;
    padding: 0 !important;
    border-radius: 999px !important;
    background: #d2d2d7 !important;
    box-shadow: none !important;
    transition: background-color var(--apple-duration) ease-out !important;
}

.switch-label::after {
    width: 22px !important;
    height: 22px !important;
    top: 3px !important;
    left: 3px !important;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.22) !important;
    transition: transform var(--apple-duration) var(--apple-ease-out) !important;
}

.switch-input:checked + .switch-label {
    background: var(--apple-green) !important;
}

.switch-input:checked + .switch-label::after {
    transform: translateX(20px) !important;
}

.chapter-tabs,
.cover-tabs,
.repair-preview-tabs {
    gap: 4px;
    padding: 4px;
    border: 0 !important;
    border-radius: var(--apple-radius-small);
    background: rgba(118, 118, 128, 0.12);
}

.chapter-tab,
.cover-tab,
.repair-tab-btn {
    min-height: 38px;
    border: 0 !important;
    border-radius: 8px !important;
    color: var(--apple-secondary) !important;
    background: transparent !important;
    transition: background-color var(--apple-duration-fast) ease-out, color var(--apple-duration-fast) ease-out !important;
}

.chapter-tab.active,
.cover-tab.active,
.repair-tab-btn.active {
    color: var(--apple-text) !important;
    background: var(--apple-surface-solid) !important;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.08);
}

.multi-select-section,
.multi-level-header-setting,
.filter-rule-card,
.template-examples,
.repair-preview,
.custom-styles-section,
.cover-settings-section {
    border: 1px solid var(--apple-border) !important;
    border-radius: var(--apple-radius-small) !important;
    background: rgba(118, 118, 128, 0.06) !important;
    box-shadow: none !important;
}

.format-tag,
.add-custom-format-btn {
    border-radius: 9px !important;
    transition: background-color var(--apple-duration-fast) ease-out, border-color var(--apple-duration-fast) ease-out, transform var(--apple-duration-fast) var(--apple-ease-out) !important;
}

.format-tag:hover,
.add-custom-format-btn:hover {
    transform: translateY(-1px);
}

.chapter-item {
    border: 0 !important;
    border-bottom: 1px solid var(--apple-divider) !important;
    border-radius: 0 !important;
    background: transparent !important;
    box-shadow: none !important;
    transition: background-color var(--apple-duration-fast) ease-out, transform var(--apple-duration-fast) var(--apple-ease-out) !important;
}

.chapter-item:hover {
    background: rgba(118, 118, 128, 0.08) !important;
    box-shadow: none !important;
    transform: translateX(2px);
}

.chapter-list-container {
    border: 1px solid var(--apple-border) !important;
    border-radius: var(--apple-radius-small) !important;
    background: var(--apple-surface-solid) !important;
}

.convert-buttons {
    margin-top: 22px;
    padding: 0;
}

.convert-buttons .convert-btn {
    min-height: 52px;
    margin: 0 !important;
    border-radius: 12px !important;
    font-size: 1.05rem;
}

.progress {
    margin-top: 18px;
    padding: 16px 18px;
    border-radius: var(--apple-radius-small) !important;
}

.progress-bar {
    height: 8px !important;
    border-radius: 999px !important;
    background: #e5e5ea !important;
    box-shadow: none !important;
    overflow: hidden;
}

.progress-bar::after {
    display: none !important;
    animation: none !important;
}

.progress-bar > * {
    border-radius: inherit;
}

.result {
    margin-top: 18px;
    padding: 26px 24px !important;
    text-align: left;
}

.result h3 {
    margin-bottom: 6px;
    color: var(--apple-text);
    font-size: 1.25rem;
}

.result p {
    margin: 0;
    color: var(--apple-secondary);
}

.chapter-preview-modal {
    background: rgba(0, 0, 0, 0.28) !important;
    backdrop-filter: blur(3px);
    -webkit-backdrop-filter: blur(3px);
}

.chapter-preview-content {
    border: 1px solid var(--apple-border) !important;
    border-radius: 16px !important;
    background: rgba(255, 255, 255, 0.94) !important;
    box-shadow: var(--apple-shadow-float) !important;
    transform-origin: center;
    animation: apple-modal-in 200ms var(--apple-ease-out);
}

.chapter-preview-close {
    width: 32px !important;
    height: 32px !important;
    border-radius: 50% !important;
    background: rgba(118, 118, 128, 0.12) !important;
    transition: transform var(--apple-duration-fast) var(--apple-ease-out), background-color var(--apple-duration-fast) ease-out !important;
}

.chapter-preview-close:active {
    transform: scale(0.94);
}

@keyframes apple-modal-in {
    from { opacity: 0; transform: translateY(8px) scale(0.97); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.message {
    animation: apple-toast-in 180ms var(--apple-ease-out) !important;
}

.message.removing {
    animation: apple-toast-out 160ms var(--apple-ease-out) forwards !important;
}

@keyframes apple-toast-in {
    from { opacity: 0; transform: translateX(12px) scale(0.98); }
    to { opacity: 1; transform: translateX(0) scale(1); }
}

@keyframes apple-toast-out {
    from { opacity: 1; transform: translateX(0) scale(1); }
    to { opacity: 0; transform: translateX(12px) scale(0.98); }
}

.toast-notification {
    border: 1px solid var(--apple-border) !important;
    border-radius: 12px !important;
    box-shadow: var(--apple-shadow-float) !important;
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
}

@media (max-width: 768px) {
    .navbar-brand {
        display: flex !important;
        margin-right: auto !important;
        min-width: 0;
    }

    .navbar-brand-text {
        display: inline !important;
        overflow: hidden;
        text-overflow: ellipsis;
        max-width: 46vw;
    }

    .header {
        padding: 34px 18px 20px;
    }

    .header h1 {
        font-size: clamp(2.1rem, 11vw, 3rem);
    }

    .header p {
        font-size: 0.96rem;
    }

    .content {
        padding: 0 14px 42px;
    }

    .convert-buttons {
        position: sticky;
        bottom: 0;
        z-index: 20;
        margin: 18px -14px 0;
        padding: 10px 14px calc(10px + env(safe-area-inset-bottom));
        background: rgba(245, 245, 247, 0.84);
        border-top: 1px solid var(--apple-divider);
        backdrop-filter: blur(18px) saturate(1.15);
        -webkit-backdrop-filter: blur(18px) saturate(1.15);
    }

    .file-upload-section {
        grid-template-columns: auto 1fr;
        gap: 14px;
        padding: 20px !important;
    }

    .file-upload-section .upload-btn {
        grid-column: 1 / -1;
        width: 100%;
        margin: 4px 0 0 !important;
    }

    .settings-section > h3,
    #settingsTitle {
        padding-left: 18px;
        padding-right: 18px;
    }

    .manager-content,
    .basic-info-content,
    .cover-settings-content,
    .styles-content,
    .filter-content {
        padding: 18px !important;
    }

    .form-row,
    .form-row.three-cols,
    .form-row.four-cols {
        gap: 14px;
    }

    .chapter-preview-content {
        width: calc(100vw - 28px) !important;
        max-height: calc(100vh - 36px);
    }

    .chapter-preview-footer {
        display: grid !important;
        grid-template-columns: 1fr 1fr;
        gap: 8px;
    }

    .chapter-preview-footer .btn-base {
        width: 100%;
        margin: 0 !important;
    }
}

@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;
    }
}

@media (prefers-reduced-transparency: reduce) {
    .unified-navbar,
    .navbar,
    .file-upload-section,
    .encoding-text-manager,
    .settings-section,
    .chapters-preview,
    .chapter-filter-section,
    .result,
    .progress,
    .chapter-preview-content,
    .toast-notification {
        background: var(--apple-surface-solid) !important;
        backdrop-filter: none !important;
        -webkit-backdrop-filter: none !important;
    }
}

/* Refinement pass: roomier rhythm, stronger type hierarchy, and purposeful motion. */
body {
    background: #f2f2f7;
}

.container {
    width: min(1120px, calc(100% - 40px));
}

.header {
    padding: 64px 0 34px;
}

.header h1 {
    font-family: "Inter", "SF Pro Display", "Segoe UI Variable", "PingFang SC", "Microsoft YaHei UI", system-ui, sans-serif;
    font-size: clamp(2.35rem, 5vw, 4.25rem);
    font-weight: 720;
    letter-spacing: -0.06em;
}

.header p {
    font-size: 1.08rem;
    max-width: 680px;
}

.content {
    padding: 0 0 80px;
}

.file-upload-section {
    min-height: 218px;
    padding: 34px 36px !important;
    gap: 22px;
    animation: apple-rise-in 260ms var(--apple-ease-out) both;
}

.file-upload-section h3 {
    font-size: 1.36rem;
    line-height: 1.25;
}

.file-upload-section p {
    font-size: 0.98rem;
}

.upload-icon {
    width: 58px !important;
    height: 58px !important;
    line-height: 58px !important;
    border-radius: 17px !important;
    font-size: 1.9rem !important;
    transition: transform 220ms var(--apple-ease-out), background-color 180ms ease-out, color 180ms ease-out !important;
}

.btn-base,
.btn-primary,
.btn-secondary,
.btn-action,
.convert-btn,
.download-btn,
.upload-btn,
.action-btn,
.control-btn,
.filter-apply-btn,
.preset-btn,
.btn-edit,
.btn-readonly,
.btn-save,
.btn-confirm-encoding,
.btn-test {
    min-height: 44px;
    padding: 11px 17px !important;
    font-size: 0.95rem !important;
    line-height: 1.35 !important;
    white-space: normal !important;
    overflow-wrap: anywhere;
}

.upload-btn {
    min-width: 124px;
}

.settings-section,
.encoding-text-manager,
.chapters-preview,
.chapter-filter-section,
.result,
.progress {
    margin-top: 24px !important;
}

.section-header,
.repair-header,
.cover-settings-section > .section-header,
.custom-styles-section > .section-header {
    min-height: 62px;
    padding: 18px 28px !important;
}

.manager-content,
.basic-info-content,
.cover-settings-content,
.styles-content,
.filter-content {
    padding: 30px 32px !important;
}

.form-group,
.style-group {
    margin-bottom: 24px;
}

.form-label,
.form-group label,
.style-group label {
    margin-bottom: 10px;
    font-size: 0.96rem;
}

.form-input,
.form-select,
.form-textarea,
.form-group input,
.form-group select,
.form-group textarea,
.select-input,
.template-input,
.filename-preview-input,
.chapter-template-select,
.filter-number-input,
.title-length-input {
    min-height: 46px;
    font-size: 1rem !important;
}

.text-manager-textarea,
.chapter-pattern-display,
.chapter-preview-textarea,
.css-textarea {
    min-height: 180px;
    line-height: 1.65;
}

.convert-buttons {
    padding-top: 4px;
}

.convert-buttons .convert-btn {
    min-height: 58px;
    font-size: 1.08rem !important;
    letter-spacing: -0.02em;
}

.result {
    animation: apple-rise-in 260ms var(--apple-ease-out) both;
}

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

@media (hover: hover) and (pointer: fine) {
    .file-upload-section:hover .upload-icon {
        transform: translateY(-2px) scale(1.04);
    }
}

@media (hover: none), (pointer: coarse) {
    .file-upload-section:hover,
    .chapter-item:hover,
    .btn-primary:hover:not(:disabled),
    .btn-secondary:hover:not(:disabled),
    .btn-action:hover:not(:disabled),
    .convert-btn:hover:not(:disabled),
    .upload-btn:hover:not(:disabled) {
        transform: none;
    }

    .file-upload-section:hover {
        box-shadow: var(--apple-shadow) !important;
    }
}

.file-upload-section.dragover .upload-icon {
    transform: translateY(-3px) scale(1.05);
}

.file-upload-section.file-selected .upload-icon {
    background: #e8f8ed !important;
    color: var(--apple-green);
    animation: apple-file-confirm 220ms var(--apple-ease-out);
}

.encoding-text-manager .manager-content.show,
.basic-info-content.show,
.cover-settings-content.show,
.styles-content.show,
.filter-content.show,
.repair-section .manager-content.show {
    animation: apple-panel-in 220ms var(--apple-ease-out);
    transform-origin: top center;
}

@keyframes apple-file-confirm {
    0% { opacity: 0.82; transform: scale(0.96); }
    70% { opacity: 1; transform: scale(1.04); }
    100% { opacity: 1; transform: scale(1); }
}

@keyframes apple-panel-in {
    from { opacity: 0; transform: translateY(-6px) scale(0.99); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

@media (prefers-contrast: more) {
    .file-upload-section,
    .encoding-text-manager,
    .settings-section,
    .chapters-preview,
    .chapter-filter-section,
    .result,
    .progress,
    .form-input,
    .form-select,
    .form-textarea,
    .chapter-list-container {
        border-color: currentColor !important;
    }

    .btn-primary,
    .btn-action,
    .convert-btn,
    .upload-btn {
        box-shadow: none !important;
    }
}

:root[data-theme="dark"],
:root.theme-dark {
    --apple-bg: #1d1d1f;
    --apple-surface: rgba(44, 44, 46, 0.9);
    --apple-surface-solid: #2c2c2e;
    --apple-border: rgba(235, 235, 245, 0.18);
    --apple-divider: rgba(235, 235, 245, 0.12);
    --apple-text: #f5f5f7;
    --apple-secondary: #a1a1a6;
    --apple-tertiary: #8e8e93;
    --apple-shadow: 0 12px 28px rgba(0, 0, 0, 0.22);
    --apple-shadow-float: 0 18px 44px rgba(0, 0, 0, 0.34);
}

:root[data-theme="dark"] body,
:root.theme-dark body {
    background: var(--apple-bg);
}

:root[data-theme="dark"] .unified-navbar,
:root.theme-dark .unified-navbar,
:root[data-theme="dark"] .navbar,
:root.theme-dark .navbar {
    background: rgba(29, 29, 31, 0.82) !important;
}

:root[data-theme="dark"] .upload-icon,
:root.theme-dark .upload-icon {
    background: rgba(0, 113, 227, 0.2) !important;
}

:root[data-theme="dark"] .chapter-preview-content,
:root.theme-dark .chapter-preview-content {
    background: rgba(44, 44, 46, 0.96) !important;
}

:root[data-theme="dark"] .form-input,
:root.theme-dark .form-input,
:root[data-theme="dark"] .form-select,
:root.theme-dark .form-select,
:root[data-theme="dark"] .form-textarea,
:root.theme-dark .form-textarea,
:root[data-theme="dark"] .form-group input,
:root.theme-dark .form-group input,
:root[data-theme="dark"] .form-group select,
:root.theme-dark .form-group select,
:root[data-theme="dark"] .form-group textarea,
:root.theme-dark .form-group textarea {
    background: #1d1d1f !important;
}

:root[data-theme="dark"] .progress-bar,
:root.theme-dark .progress-bar {
    background: #48484a !important;
}

@media (max-width: 768px) {
    :root[data-theme="dark"] .convert-buttons,
    :root.theme-dark .convert-buttons {
        background: rgba(29, 29, 31, 0.86);
    }
}

@media (prefers-reduced-transparency: reduce) {
    .convert-buttons {
        background: var(--apple-bg);
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
    }
}

@media (max-width: 768px) {
    .container {
        width: min(100% - 24px, 1120px);
    }

    .header {
        padding: 38px 0 24px;
    }

    .header h1 {
        font-size: clamp(2.2rem, 11vw, 3.2rem);
        line-height: 1.08;
    }

    .header p {
        font-size: 0.98rem;
    }

    .content {
        padding-bottom: 92px;
    }

    .file-upload-section {
        min-height: 208px;
        padding: 24px !important;
        gap: 16px;
    }

    .file-upload-section h3 {
        font-size: 1.2rem;
    }

    .section-header,
    .repair-header,
    .cover-settings-section > .section-header,
    .custom-styles-section > .section-header {
        min-height: 58px;
        padding: 16px 20px !important;
    }

    .manager-content,
    .basic-info-content,
    .cover-settings-content,
    .styles-content,
    .filter-content {
        padding: 24px 20px !important;
    }

    .btn-base,
    .btn-primary,
    .btn-secondary,
    .btn-action,
    .convert-btn,
    .download-btn,
    .upload-btn,
    .action-btn,
    .control-btn,
    .filter-apply-btn,
    .preset-btn,
    .btn-edit,
    .btn-readonly,
    .btn-save,
    .btn-confirm-encoding,
    .btn-test {
        min-height: 46px;
        padding: 12px 15px !important;
        font-size: 0.94rem !important;
    }

    .convert-buttons {
        margin-left: -12px;
        margin-right: -12px;
        padding-left: 12px;
        padding-right: 12px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .file-upload-section,
    .result,
    .file-upload-section.file-selected .upload-icon,
    .encoding-text-manager .manager-content.show,
    .basic-info-content.show,
    .cover-settings-content.show,
    .styles-content.show,
    .filter-content.show,
    .repair-section .manager-content.show {
        animation: none !important;
    }

    .file-upload-section.dragover .upload-icon,
    .file-upload-section.file-selected .upload-icon {
        transform: none !important;
    }
}

@media (max-width: 768px) and (prefers-reduced-transparency: reduce) {
    .convert-buttons {
        background: var(--apple-bg) !important;
        backdrop-filter: none !important;
        -webkit-backdrop-filter: none !important;
    }
}