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

:root {
    --md-primary: #1976D2;
    --md-primary-dark: #1565C0;
    --md-primary-light: #BBDEFB;
    --md-on-primary: #FFFFFF;
    --md-surface: #FFFFFF;
    --md-background: #F5F5F5;
    --md-error: #D32F2F;
    --md-on-surface: #1C1B1F;
    --md-on-surface-variant: #49454F;
    --md-outline: #79747E;
    --md-success: #2E7D32;
    --md-shadow-1: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
    --md-shadow-2: 0 3px 6px rgba(0,0,0,0.16), 0 3px 6px rgba(0,0,0,0.23);
    --md-shadow-3: 0 10px 20px rgba(0,0,0,0.19), 0 6px 6px rgba(0,0,0,0.23);
    --md-radius: 12px;
    --md-radius-sm: 8px;
}

body {
    font-family: 'Noto Sans JP', 'Roboto', sans-serif;
    background-color: var(--md-background);
    color: var(--md-on-surface);
    line-height: 1.6;
    min-height: 100vh;
}

.container { max-width: 600px; margin: 0 auto; padding: 24px 16px; }

.card {
    background: var(--md-surface);
    border-radius: var(--md-radius);
    box-shadow: var(--md-shadow-1);
    padding: 24px;
    margin-bottom: 16px;
}
.card:hover { box-shadow: var(--md-shadow-2); }

.headline { font-size: 24px; font-weight: 500; margin-bottom: 16px; color: var(--md-on-surface); }
.subhead { font-size: 14px; color: var(--md-on-surface-variant); margin-bottom: 24px; }
.label { font-size: 12px; font-weight: 500; color: var(--md-on-surface-variant); margin-bottom: 4px; display: block; }

.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 12px 24px; border: none; border-radius: 20px;
    font-size: 14px; font-weight: 500; font-family: inherit;
    cursor: pointer; transition: all 0.2s ease; text-decoration: none;
}
.btn-primary { background: var(--md-primary); color: var(--md-on-primary); }
.btn-primary:hover { background: var(--md-primary-dark); box-shadow: var(--md-shadow-2); }
.btn-primary:disabled { background: #ccc; cursor: not-allowed; box-shadow: none; }
.btn-outline { background: transparent; color: var(--md-primary); border: 1px solid var(--md-outline); }
.btn-outline:hover { background: var(--md-primary-light); }
.btn-error { background: var(--md-error); color: var(--md-on-primary); }
.btn-error:hover { background: #B71C1C; }
.btn-sm { padding: 8px 16px; font-size: 12px; }

.input-group { margin-bottom: 16px; }
.text-input {
    width: 100%; padding: 16px;
    border: 1px solid var(--md-outline); border-radius: var(--md-radius-sm);
    font-size: 16px; font-family: inherit;
    background: var(--md-surface); color: var(--md-on-surface);
    transition: border-color 0.2s;
}
.text-input:focus { outline: none; border-color: var(--md-primary); box-shadow: 0 0 0 1px var(--md-primary); }
.text-input::placeholder { color: var(--md-on-surface-variant); }
.input-hint { font-size: 12px; color: var(--md-on-surface-variant); margin-top: 4px; }

.drop-zone {
    border: 2px dashed var(--md-outline); border-radius: var(--md-radius);
    padding: 48px 24px; text-align: center; cursor: pointer;
    transition: all 0.2s; margin-bottom: 16px;
}
.drop-zone:hover, .drop-zone.dragover { border-color: var(--md-primary); background: rgba(25, 118, 210, 0.04); }
.drop-zone-icon { font-size: 48px; margin-bottom: 8px; color: var(--md-primary); }
.drop-zone-text { color: var(--md-on-surface-variant); font-size: 14px; }
.drop-zone-filename { font-weight: 500; color: var(--md-on-surface); margin-top: 8px; word-break: break-all; }

.progress-container { display: none; margin: 16px 0; }
.progress-container.active { display: block; }
.progress-bar-track { height: 4px; background: var(--md-primary-light); border-radius: 2px; overflow: hidden; }
.progress-bar-fill { height: 100%; background: var(--md-primary); border-radius: 2px; width: 0%; transition: width 0.3s ease; }
.progress-text { font-size: 12px; color: var(--md-on-surface-variant); margin-top: 4px; text-align: right; }

.result-area { display: none; margin-top: 16px; }
.result-area.active { display: block; }
.result-url {
    display: flex; align-items: center; gap: 8px;
    background: var(--md-background); padding: 12px;
    border-radius: var(--md-radius-sm); margin-bottom: 12px; word-break: break-all;
}
.result-url input {
    flex: 1; border: none; background: transparent;
    font-size: 14px; font-family: inherit; color: var(--md-on-surface); outline: none;
}
.result-actions { display: flex; gap: 8px; flex-wrap: wrap; }

.snackbar {
    position: fixed; bottom: 24px; left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: #323232; color: white; padding: 12px 24px;
    border-radius: var(--md-radius-sm); font-size: 14px;
    box-shadow: var(--md-shadow-3); transition: transform 0.3s ease;
    z-index: 1000; max-width: calc(100% - 32px);
}
.snackbar.show { transform: translateX(-50%) translateY(0); }
.snackbar.error { background: var(--md-error); }
.snackbar.success { background: var(--md-success); }

.file-info { display: flex; align-items: center; gap: 16px; margin-bottom: 24px; }
.file-icon {
    width: 48px; height: 48px; background: var(--md-primary-light);
    border-radius: var(--md-radius-sm); display: flex; align-items: center;
    justify-content: center; font-size: 24px; color: var(--md-primary); flex-shrink: 0;
}
.file-details .file-name { font-weight: 500; word-break: break-all; }
.file-details .file-size { font-size: 14px; color: var(--md-on-surface-variant); }

.admin-summary { display: flex; gap: 16px; margin-bottom: 16px; }
.admin-stat {
    background: var(--md-primary-light); padding: 12px 16px;
    border-radius: var(--md-radius-sm); flex: 1; text-align: center;
}
.admin-stat .stat-value { font-size: 24px; font-weight: 500; color: var(--md-primary); }
.admin-stat .stat-label { font-size: 12px; color: var(--md-on-surface-variant); }

.data-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.data-table th {
    text-align: left; padding: 12px 8px; border-bottom: 2px solid var(--md-outline);
    font-weight: 500; color: var(--md-on-surface-variant); font-size: 12px;
}
.data-table td { padding: 12px 8px; border-bottom: 1px solid #e0e0e0; vertical-align: middle; }
.data-table tr:hover { background: rgba(0,0,0,0.04); }
.table-filename { max-width: 200px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.hidden { display: none !important; }
.text-center { text-align: center; }
.mt-16 { margin-top: 16px; }
.mb-16 { margin-bottom: 16px; }

/* === File List (upload page) === */
.file-list { margin-bottom: 16px; }
.file-list-item {
    display: flex; align-items: center; gap: 8px;
    padding: 8px 12px; background: var(--md-background);
    border-radius: var(--md-radius-sm); margin-bottom: 4px;
}
.file-list-name { flex: 1; font-size: 14px; word-break: break-all; }
.file-list-size { font-size: 12px; color: var(--md-on-surface-variant); white-space: nowrap; }
.file-list-remove {
    background: none; border: none; font-size: 18px; cursor: pointer;
    color: var(--md-error); padding: 0 4px; line-height: 1;
}
.file-list-remove:hover { opacity: 0.7; }

.file-summary { font-size: 14px; color: var(--md-on-surface-variant); margin-bottom: 16px; text-align: right; }
.file-summary-error { color: var(--md-error); font-weight: 500; }

/* === Download File List === */
.dl-file-list { border: 1px solid #e0e0e0; border-radius: var(--md-radius-sm); overflow: hidden; }
.dl-file-item {
    display: flex; justify-content: space-between; align-items: center;
    padding: 10px 12px; border-bottom: 1px solid #e0e0e0;
}
.dl-file-item:last-child { border-bottom: none; }
.dl-file-name { font-size: 14px; word-break: break-all; }
.dl-file-size { font-size: 12px; color: var(--md-on-surface-variant); white-space: nowrap; margin-left: 8px; }

.dl-download-item {
    display: flex; justify-content: space-between; align-items: center;
    padding: 12px; background: var(--md-background);
    border-radius: var(--md-radius-sm); margin-bottom: 8px;
}
.dl-download-info { flex: 1; min-width: 0; }
.dl-download-info .dl-file-name { display: block; }
.dl-download-info .dl-file-size { display: block; margin-left: 0; margin-top: 2px; }

@media (max-width: 480px) {
    .container { padding: 16px 12px; }
    .card { padding: 16px; }
    .headline { font-size: 20px; }
    .drop-zone { padding: 32px 16px; }
    .admin-summary { flex-direction: column; }
    .data-table { font-size: 12px; }
    .data-table th, .data-table td { padding: 8px 4px; }
}