:root {
    --bg: #0f1115;
    --surface: #1a1d24;
    --surface-2: #232833;
    --border: #2e3542;
    --text: #e8eaf0;
    --text-dim: #9aa3b2;
    --accent: #5b8cff;
    --accent-2: #8f6bff;
    --success: #2fd573;
    --danger: #ff5d6c;
    --radius: 14px;
    --shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
}

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

body {
    font-family: 'Lexend', system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

/* ---------- Login ---------- */
.login-body {
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #0f1115 0%, #161b2e 55%, #1d1533 100%);
    padding: 24px;
}

.login-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 40px 36px;
    width: 100%;
    max-width: 400px;
    box-shadow: var(--shadow);
    animation: rise 0.45s ease both;
}

@keyframes rise {
    from { opacity: 0; transform: translateY(14px); }
    to { opacity: 1; transform: translateY(0); }
}

.login-logo { font-size: 42px; text-align: center; }
.login-card h1 {
    text-align: center;
    font-size: 24px;
    font-weight: 700;
    margin: 10px 0 4px;
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}
.login-sub { text-align: center; color: var(--text-dim); font-size: 13px; margin-bottom: 24px; }

/* ---------- Layout ---------- */
.topbar {
    position: sticky;
    top: 0;
    z-index: 10;
    background: rgba(15, 17, 21, 0.85);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
}
.topbar-inner {
    max-width: 1000px;
    margin: 0 auto;
    padding: 14px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.brand { font-weight: 700; font-size: 16px; }
.topbar-right { display: flex; align-items: center; gap: 12px; }
.user-chip {
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 6px 14px;
    font-size: 13px;
    color: var(--text-dim);
}

.container { max-width: 1000px; margin: 0 auto; padding: 24px 20px 80px; }

/* ---------- Breadcrumb ---------- */
.breadcrumb {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
    margin-bottom: 18px;
    font-size: 14px;
}
.crumb { color: var(--text-dim); text-decoration: none; padding: 4px 8px; border-radius: 8px; transition: all 0.15s ease; }
.crumb:hover { color: var(--text); background: var(--surface); }
.crumb.active { color: var(--accent); font-weight: 600; }
.crumb-sep { color: var(--text-dim); opacity: 0.5; }

/* ---------- Action bar ---------- */
.action-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    align-items: center;
    justify-content: space-between;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    box-shadow: var(--shadow);
    margin-bottom: 12px;
}
.upload-form, .folder-form { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.upload-hint { font-size: 12px; color: var(--text-dim); max-width: 260px; }
.folder-form input[type="text"], .field input {
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 10px 14px;
    color: var(--text);
    font-family: inherit;
    font-size: 14px;
    outline: none;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.folder-form input[type="text"]:focus, .field input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(91, 140, 255, 0.18);
}
.folder-form input[type="text"] { width: 210px; }

.storage-info { font-size: 12px; color: var(--text-dim); margin: 4px 2px 14px; }

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    border: none;
    border-radius: 10px;
    padding: 10px 18px;
    font-family: inherit;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: transform 0.12s ease, box-shadow 0.12s ease, filter 0.12s ease;
}
.btn:hover { transform: translateY(-1px); filter: brightness(1.08); }
.btn:active { transform: translateY(0); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.btn-primary {
    color: #fff;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    box-shadow: 0 6px 18px rgba(91, 140, 255, 0.3);
}
.btn-accent {
    color: #10141c;
    background: linear-gradient(135deg, #a3ff12, #6ee20b);
    box-shadow: 0 6px 18px rgba(163, 255, 18, 0.22);
}
.btn-ghost {
    background: var(--surface-2);
    border: 1px solid var(--border);
    color: var(--text);
}
.btn-danger {
    background: rgba(255, 93, 108, 0.12);
    border: 1px solid rgba(255, 93, 108, 0.35);
    color: var(--danger);
}
.btn-danger:hover { background: rgba(255, 93, 108, 0.22); }
.btn-sm { padding: 7px 12px; font-size: 13px; }
.btn-block { width: 100%; }
.file-btn { position: relative; overflow: hidden; }

/* ---------- Fields ---------- */
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 13px; color: var(--text-dim); margin-bottom: 6px; }
.field input { width: 100%; }

/* ---------- Alerts ---------- */
.alert {
    padding: 12px 16px;
    border-radius: 10px;
    font-size: 14px;
    margin-bottom: 16px;
    border: 1px solid;
    animation: rise 0.3s ease both;
}
.alert-success { background: rgba(47, 213, 115, 0.1); border-color: rgba(47, 213, 115, 0.35); color: var(--success); }
.alert-error { background: rgba(255, 93, 108, 0.1); border-color: rgba(255, 93, 108, 0.35); color: var(--danger); }

/* ---------- File list ---------- */
.file-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.file-row {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 12px 16px;
    transition: transform 0.12s ease, border-color 0.12s ease, box-shadow 0.12s ease;
}
.file-row:hover {
    transform: translateY(-2px);
    border-color: rgba(91, 140, 255, 0.5);
    box-shadow: 0 6px 22px rgba(0, 0, 0, 0.3);
}
.folder-row:hover { border-color: rgba(163, 255, 18, 0.45); }
.file-main { display: flex; align-items: center; gap: 12px; flex: 1; min-width: 0; text-decoration: none; color: var(--text); }
.file-icon { font-size: 22px; flex-shrink: 0; }
.file-name { font-size: 14px; font-weight: 500; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.file-meta { font-size: 12px; color: var(--text-dim); white-space: nowrap; flex-shrink: 0; }
.file-actions { display: flex; gap: 6px; flex-shrink: 0; }
.inline-form { display: inline; margin: 0; }

/* ---------- Bulk select ---------- */
.bulk-bar {
    display: flex;
    align-items: center;
    gap: 14px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 10px 16px;
    margin-bottom: 12px;
}
.check-all-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-dim);
    cursor: pointer;
    user-select: none;
}
.bulk-count { font-size: 12px; color: var(--text-dim); }
.row-check {
    width: 17px;
    height: 17px;
    accent-color: var(--accent);
    cursor: pointer;
    flex-shrink: 0;
}

/* ---------- Modal preview ---------- */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    padding: 20px;
}
.modal-overlay[hidden] { display: none; }
.modal {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    box-shadow: var(--shadow);
    max-width: min(92vw, 960px);
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    animation: rise 0.25s ease both;
}
.modal-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
}
.modal-title {
    font-size: 14px;
    font-weight: 600;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.modal-close {
    background: var(--surface-2);
    border: 1px solid var(--border);
    color: var(--text-dim);
    width: 30px;
    height: 30px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    line-height: 1;
    flex-shrink: 0;
    transition: all 0.12s ease;
}
.modal-close:hover { color: var(--text); border-color: var(--danger); }
.modal-body {
    padding: 12px;
    overflow: auto;
    display: flex;
    align-items: center;
    justify-content: center;
}
.modal-body img {
    display: block;
    max-width: 100%;
    max-height: 76vh;
    border-radius: 8px;
}

/* ---------- Empty ---------- */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-dim);
    background: var(--surface);
    border: 1px dashed var(--border);
    border-radius: var(--radius);
}
.empty-icon { font-size: 44px; margin-bottom: 12px; }
.empty-state p { font-size: 14px; }

@media (max-width: 640px) {
    .action-bar { flex-direction: column; align-items: stretch; }
    .upload-form, .folder-form { width: 100%; }
    .folder-form input[type="text"] { flex: 1; width: auto; }
    .file-meta { display: none; }
}