:root {
    --bg: #f5f6f8;
    --card: #fff;
    --text: #1a1a2e;
    --text-muted: #6b7280;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --border: #e5e7eb;
    --danger: #dc2626;
}

* {
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    margin: 0;
    min-height: 100vh;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
}

.header {
    background: var(--card);
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border);
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent);
}

.tagline {
    margin: 0.25rem 0 0;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.main {
    max-width: 720px;
    margin: 0 auto;
    padding: 2rem;
}

.upload-zone {
    background: var(--card);
    border: 2px dashed var(--border);
    border-radius: 12px;
    padding: 2.5rem;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
}

.upload-zone:hover,
.upload-zone.dragover {
    border-color: var(--accent);
    background: #f8fafc;
}

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

.files-section {
    margin-top: 2rem;
}

.files-section h2 {
    font-size: 1.125rem;
    font-weight: 600;
    margin: 0 0 1rem;
    color: var(--text);
}

.files-list {
    background: var(--card);
    border-radius: 12px;
    border: 1px solid var(--border);
    overflow: hidden;
}

.loading {
    padding: 1.5rem;
    margin: 0;
    color: var(--text-muted);
    font-size: 0.875rem;
}

.file-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border);
    gap: 1rem;
}

.file-row:last-child {
    border-bottom: none;
}

.file-name {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 0.9375rem;
}

.file-meta {
    flex-shrink: 0;
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.file-actions {
    display: flex;
    gap: 0.5rem;
}

.btn {
    padding: 0.375rem 0.75rem;
    border-radius: 6px;
    font-size: 0.8125rem;
    cursor: pointer;
    border: none;
    text-decoration: none;
    background: var(--accent);
    color: #fff;
}

.btn:hover {
    background: var(--accent-hover);
}

.btn-danger {
    background: transparent;
    color: var(--danger);
}

.btn-danger:hover {
    background: #fef2f2;
}

.btn-disabled {
    cursor: default;
    opacity: 0.7;
}

.notice {
    margin: 0.5rem 0 0;
    font-size: 0.8125rem;
    color: var(--accent);
}

.empty {
    padding: 1.5rem;
    margin: 0;
    color: var(--text-muted);
    font-size: 0.875rem;
    text-align: center;
}

.footer {
    padding: 1.5rem 2rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.75rem;
}

.screen {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}
.screen--hidden {
    display: none !important;
}

.header--compact {
    margin-bottom: 0;
}
.header {
    position: relative;
}
.logout {
    position: absolute;
    right: 2rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.875rem;
    color: var(--text-muted);
    text-decoration: none;
}
.logout:hover {
    color: var(--accent);
}

.main--center {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.login-form {
    width: 100%;
    max-width: 360px;
    background: var(--card);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border);
    box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}
.login-title {
    margin: 0 0 0.25rem;
    font-size: 1.25rem;
    font-weight: 600;
}
.login-desc {
    margin: 0 0 1.5rem;
    font-size: 0.875rem;
    color: var(--text-muted);
}
.label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.375rem;
    color: var(--text);
}
.input {
    width: 100%;
    padding: 0.5rem 0.75rem;
    margin-bottom: 1rem;
    font-size: 1rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--card);
}
.input:focus {
    outline: none;
    border-color: var(--accent);
}
.form-error {
    display: none;
    margin: 0 0 1rem;
    font-size: 0.875rem;
    color: var(--danger);
}
.btn--block {
    width: 100%;
    margin-top: 0.5rem;
    padding: 0.625rem;
    font-size: 1rem;
}
.link {
    display: block;
    margin-top: 1rem;
    font-size: 0.875rem;
    color: var(--text-muted);
    text-decoration: none;
}
.link:hover {
    color: var(--accent);
}

.modal {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
}
.modal--hidden {
    display: none;
}
.modal-content {
    background: var(--card);
    padding: 1.5rem 2rem;
    border-radius: 12px;
    max-width: 360px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}
.modal-content p {
    margin: 0 0 1rem;
    font-size: 0.9375rem;
    color: var(--text);
}
.modal-content .btn {
    width: 100%;
}