/* ── Reset & Variables ── */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --primary: #2ecc71;
    --primary-dark: #27ae60;
    --primary-light: #eafaf1;
    --danger: #e74c3c;
    --warning-bg: #fffde7;
    --warning-text: #f39c12;
    --text: #2c3e50;
    --text-muted: #7f8c8d;
    --border: #dfe6e9;
    --bg: #f0f4f2;
    --card: #ffffff;
    --radius-sm: 8px;
    --radius: 14px;
    --shadow: 0 2px 18px rgba(0, 0, 0, .08);
    --shadow-hover: 0 6px 24px rgba(0, 0, 0, .13);
    --transition: .18s ease;
}

/* ── Base ── */
html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans TC',
        'PingFang TC', 'Microsoft JhengHei', sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ── Header ── */
.header {
    background: linear-gradient(135deg, #1a6b36 0%, #14917a 100%);
    padding: 48px 24px 40px;
    text-align: center;
    color: #fff;
}

.header-inner {
    max-width: 720px;
    margin: 0 auto;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 10px;
}

.logo h1 {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -1px;
}

.tagline {
    opacity: .8;
    font-size: .95rem;
}

/* ── Main Layout ── */
.main {
    flex: 1;
    padding: 36px 20px;
}

.container {
    max-width: 880px;
    margin: 0 auto;
}

/* ── Card ── */
.card {
    background: var(--card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 24px;
    margin-bottom: 18px;
}

/* ── Tabs ── */
.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 18px;
}

.tab-btn {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 11px 22px;
    background: var(--card);
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    font-size: .93rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
}

.tab-btn:hover {
    border-color: var(--primary);
    color: var(--primary-dark);
}

.tab-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
    box-shadow: 0 4px 14px rgba(46, 204, 113, .35);
}

.tab-btn svg {
    flex-shrink: 0;
}

/* ── Settings ── */
.settings-panel.hidden {
    display: none;
}

.settings-row {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

.setting-group {
    flex: 1 1 160px;
    min-width: 0;
}

.setting-group label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: .82rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .5px;
    margin-bottom: 8px;
    color: var(--text-muted);
}

.badge-optional,
.badge-required {
    font-size: .7rem;
    font-weight: 600;
    padding: 1px 6px;
    border-radius: 20px;
    text-transform: none;
    letter-spacing: 0;
}

.badge-optional {
    background: #e8f5e9;
    color: #1b5e20;
}

.badge-required {
    background: #fdecea;
    color: var(--danger);
}

.input-unit {
    display: flex;
    align-items: stretch;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
    transition: border-color var(--transition);
}

.input-unit:focus-within {
    border-color: var(--primary);
}

.input-unit input {
    flex: 1;
    min-width: 0;
    padding: 9px 12px;
    border: none;
    outline: none;
    font-size: .94rem;
    color: var(--text);
    background: transparent;
}

.input-unit span {
    padding: 9px 12px;
    background: #f8f9fa;
    color: var(--text-muted);
    font-size: .82rem;
    border-left: 1.5px solid var(--border);
    display: flex;
    align-items: center;
}

.setting-group select {
    width: 100%;
    padding: 9px 12px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: .94rem;
    color: var(--text);
    outline: none;
    background: #fff;
    cursor: pointer;
    transition: border-color var(--transition);
}

.setting-group select:focus {
    border-color: var(--primary);
}

.hint {
    display: flex;
    align-items: flex-start;
    gap: 5px;
    margin-top: 14px;
    font-size: .78rem;
    color: var(--text-muted);
    line-height: 1.6;
}

.hint svg {
    flex-shrink: 0;
    margin-top: 1px;
}

/* ── Drop Zone ── */
.upload-card {
    padding: 0;
    overflow: hidden;
}

.drop-zone {
    /* button reset */
    display: block;
    background: none;
    font: inherit;
    color: inherit;
    width: 100%;
    padding: 64px 40px;
    text-align: center;
    border: 2.5px dashed var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--transition);
    outline: none;
}

.drop-zone:hover,
.drop-zone:focus,
.drop-zone.drag-over {
    border-color: var(--primary);
    background: var(--primary-light);
}

.drop-zone.drag-over .drop-icon {
    transform: scale(1.1);
}

.drop-icon {
    color: var(--border);
    margin: 0 auto 18px;
    display: block;
    transition: transform var(--transition);
}

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

.drop-title {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text);
}

.drop-or {
    color: var(--text-muted);
    font-size: .85rem;
    margin-bottom: 14px;
}

.btn-upload {
    display: inline-block;
    padding: 10px 28px;
    background: var(--primary);
    color: #fff;
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: .95rem;
    cursor: pointer;
    pointer-events: none;
    transition: background var(--transition), box-shadow var(--transition);
}

.btn-upload:hover {
    background: var(--primary-dark);
    box-shadow: 0 4px 14px rgba(46, 204, 113, .4);
}

.drop-hint {
    margin-top: 14px;
    font-size: .78rem;
    color: var(--text-muted);
}

/* ── File List ── */
.file-list-section {
    margin-top: 8px;
}

.file-list-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 14px;
    flex-wrap: wrap;
    gap: 10px;
}

.file-list-header h2 {
    font-size: .95rem;
    font-weight: 700;
    color: var(--text-muted);
}

.header-actions {
    display: flex;
    gap: 8px;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 9px 20px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    font-size: .9rem;
    font-weight: 700;
    cursor: pointer;
    transition: background var(--transition), box-shadow var(--transition);
}

.btn-primary:hover {
    background: var(--primary-dark);
    box-shadow: 0 4px 14px rgba(46, 204, 113, .35);
}

.btn-primary:disabled {
    background: var(--border);
    color: var(--text-muted);
    cursor: not-allowed;
    box-shadow: none;
}

.btn-ghost {
    padding: 9px 16px;
    background: none;
    color: var(--text-muted);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: .88rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
}

.btn-ghost:hover {
    border-color: var(--danger);
    color: var(--danger);
}

/* File Items */
.file-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.file-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 16px;
    background: var(--card);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow);
    border-left: 4px solid transparent;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.file-item:hover {
    box-shadow: var(--shadow-hover);
}

.file-item.pending {
    border-left-color: var(--border);
}

.file-item.processing {
    border-left-color: var(--warning-text);
}

.file-item.done {
    border-left-color: var(--primary);
}

.file-item.error {
    border-left-color: var(--danger);
}

.file-thumb {
    width: 58px;
    height: 58px;
    border-radius: 6px;
    overflow: hidden;
    flex-shrink: 0;
    background: var(--bg);
    border: 1px solid var(--border);
}

.file-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.file-info {
    flex: 1;
    min-width: 0;
}

.file-name {
    font-size: .88rem;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 5px;
}

.file-dims {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: .76rem;
    margin-bottom: 4px;
    color: var(--text-muted);
}

.size-dim {
    font-variant-numeric: tabular-nums;
    letter-spacing: .2px;
}

.size-dim-out {
    color: var(--primary-dark);
    font-weight: 600;
    font-variant-numeric: tabular-nums;
}

.file-sizes {
    display: flex;
    align-items: center;
    gap: 7px;
    font-size: .8rem;
    flex-wrap: wrap;
}

.size-original {
    color: var(--text-muted);
}

.size-arrow {
    color: var(--border);
}

.size-new {
    color: var(--primary-dark);
    font-weight: 700;
}

.badge-saved {
    background: var(--primary);
    color: #fff;
    padding: 1px 7px;
    border-radius: 20px;
    font-size: .72rem;
    font-weight: 800;
}

.badge-bigger {
    background: #fff3e0;
    color: #bf360c;
    padding: 1px 7px;
    border-radius: 20px;
    font-size: .72rem;
    font-weight: 800;
}

.error-msg {
    color: var(--danger);
    font-size: .78rem;
}

/* Status & Action */
.file-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.status-tag {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: .75rem;
    font-weight: 700;
    white-space: nowrap;
}

.status-tag.pending {
    background: var(--bg);
    color: var(--text-muted);
}

.status-tag.processing {
    background: var(--warning-bg);
    color: var(--warning-text);
}

.status-tag.error {
    background: #fdecea;
    color: var(--danger);
}

/* Spinner */
.spinner {
    display: inline-block;
    width: 11px;
    height: 11px;
    border: 2px solid var(--warning-text);
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin .7s linear infinite;
    flex-shrink: 0;
}

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

.btn-dl {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 6px 13px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: .78rem;
    font-weight: 700;
    cursor: pointer;
    white-space: nowrap;
    transition: background var(--transition);
}

.btn-dl:hover {
    background: var(--primary-dark);
}

.btn-remove {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    color: var(--border);
    font-size: 1.3rem;
    line-height: 1;
    cursor: pointer;
    border-radius: 4px;
    transition: all var(--transition);
}

.btn-remove:hover {
    background: #fdecea;
    color: var(--danger);
}

/* Download All */
.download-all-bar {
    margin-top: 18px;
    text-align: center;
}

.btn-download-all {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    padding: 14px 44px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 800;
    cursor: pointer;
    box-shadow: 0 4px 18px rgba(46, 204, 113, .35);
    transition: all var(--transition);
}

.btn-download-all:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(46, 204, 113, .45);
}

.btn-download-all:disabled {
    background: var(--border);
    color: var(--text-muted);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* ── Footer ── */
.footer {
    padding: 20px;
    text-align: center;
    font-size: .78rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border);
    background: var(--card);
    margin-top: auto;
}

/* ── Responsive ── */
@media (max-width: 600px) {
    .header {
        padding: 32px 16px 28px;
    }

    .logo h1 {
        font-size: 1.6rem;
    }

    .tabs {
        flex-direction: column;
    }

    .settings-row {
        flex-direction: column;
    }

    .file-list-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .drop-zone {
        padding: 40px 20px;
    }

    .btn-download-all {
        padding: 12px 28px;
        font-size: .92rem;
    }
}