/* ============================================================
   OARCS Cloud Computing Theme
   ============================================================ */

/* ── Custom Properties ──────────────────────────────────────── */
:root {
  --sky-900: #0a192f;
  --sky-800: #0f2744;
  --sky-700: #1e3a5f;
  --sky-600: #1d4ed8;
  --sky-500: #0ea5e9;
  --sky-400: #38bdf8;
  --sky-300: #7dd3fc;
  --sky-200: #bae6fd;
  --sky-100: #e0f2fe;
  --sky-50:  #f0f9ff;

  --glass-bg:     rgba(255,255,255,0.10);
  --glass-bg-md:  rgba(255,255,255,0.16);
  --glass-bg-lg:  rgba(255,255,255,0.22);
  --glass-border: rgba(255,255,255,0.28);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
  --glass-blur:   blur(14px);

  --text-primary: #e2e8f0;
  --text-muted:   #94a3b8;
  --text-dark:    #1e293b;

  --accent:       #38bdf8;
  --accent-hover: #0ea5e9;
  --danger:       #f43f5e;
  --warning:      #f59e0b;
  --success:      #10b981;

  --radius-xl: 20px;
  --radius-lg: 14px;
  --radius-md: 10px;
  --radius-sm:  6px;

  --transition: 0.25s ease;
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

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

html { scroll-behavior: smooth; height: 100%; overflow-x: hidden; overflow-y: auto; }

body {
  font-family: var(--font);
  min-height: 100vh;
  background: linear-gradient(160deg, var(--sky-900) 0%, var(--sky-800) 40%, var(--sky-700) 100%);
  color: var(--text-primary);
  position: relative;
}

/* ── Animated Sky Background ────────────────────────────────── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 20% -10%, rgba(14,165,233,0.18) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 80% 110%, rgba(56,189,248,0.12) 0%, transparent 55%),
    radial-gradient(ellipse 40% 30% at 50% 50%, rgba(29,78,216,0.08) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

body > * { position: relative; z-index: 1; }

/* ── Floating Cloud Decorations ─────────────────────────────── */
.cloud-bg {
  position: fixed;
  pointer-events: none;
  z-index: 0;
  opacity: 0.07;
}
.cloud-bg::before,
.cloud-bg::after {
  content: '';
  position: absolute;
  background: white;
  border-radius: 50px;
}
.cloud-1 { width: 320px; height: 80px; top: 8%;  left: -5%; animation: drift 28s linear infinite; }
.cloud-2 { width: 200px; height: 55px; top: 22%; right: -5%; animation: drift 22s linear infinite reverse; }
.cloud-3 { width: 260px; height: 65px; top: 58%; left: -5%; animation: drift 35s linear infinite 5s; }
.cloud-4 { width: 180px; height: 50px; top: 75%; right: -5%; animation: drift 25s linear infinite reverse 8s; }

.cloud-bg::before { width: 60%; height: 100%; top: -30%; left: 20%; }
.cloud-bg::after  { width: 45%; height: 80%;  top: -20%; left: 10%; }

@keyframes drift {
  from { transform: translateX(-120px); }
  to   { transform: translateX(calc(100vw + 120px)); }
}

/* ── Navbar ─────────────────────────────────────────────────── */
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  height: 60px;
  background: rgba(10,25,47,0.75);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--glass-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--accent);
  letter-spacing: 0.5px;
}

.navbar-brand .brand-icon {
  font-size: 1.6rem;
  line-height: 1;
}

.navbar-links {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.navbar-links a, .navbar-links button {
  background: none;
  border: none;
  color: var(--text-primary);
  text-decoration: none;
  font-size: 0.9rem;
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
  font-family: var(--font);
}

.navbar-links a:hover,
.navbar-links button:hover {
  background: var(--glass-bg-md);
  color: var(--accent);
}

.navbar-links .btn-logout {
  background: rgba(244,63,94,0.15);
  color: #fda4af;
  border: 1px solid rgba(244,63,94,0.3);
}
.navbar-links .btn-logout:hover {
  background: rgba(244,63,94,0.28);
  color: #fff;
}

.navbar-user {
  font-size: 0.85rem;
  color: var(--text-muted);
  padding: 0.4rem 0.9rem;
}


/* ── User Menu Dropdown ──────────────────────────────────────── */
.user-menu {
  position: relative;
}

.user-menu-btn {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.88rem;
  padding: 0.35rem 0.75rem;
  cursor: pointer;
  font-family: var(--font);
  transition: background var(--transition), border-color var(--transition);
}

.user-menu-btn:hover {
  background: var(--glass-bg-md);
  border-color: var(--accent);
  color: var(--accent);
}

.user-menu-name   { max-width: 120px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.user-menu-caret  { font-size: 0.65rem; opacity: 0.6; transition: transform var(--transition); }
.user-menu.open .user-menu-caret { transform: rotate(180deg); }

.user-menu-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 200px;
  background: rgba(10,25,47,0.97);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--glass-shadow);
  z-index: 200;
  overflow: hidden;
  opacity: 0;
  transform: translateY(-6px);
  pointer-events: none;
  transition: opacity 0.18s ease, transform 0.18s ease;
}

.user-menu.open .user-menu-dropdown {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.user-menu-dropdown a {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.65rem 1rem;
  color: var(--text-primary);
  text-decoration: none;
  font-size: 0.88rem;
  transition: background var(--transition), color var(--transition);
}

.user-menu-dropdown a:hover {
  background: var(--glass-bg-md);
  color: var(--accent);
}

.user-menu-sep {
  height: 1px;
  background: var(--glass-border);
  margin: 0.25rem 0;
}

.user-menu-header {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 1rem 1rem 0.9rem;
  border-bottom: 1px solid var(--glass-border);
}
.umav-header-ring {
  border: 2px solid var(--sky-500);
  border-radius: 50%;
  flex-shrink: 0;
  overflow: hidden;
  display: flex;
}
.user-menu-header-name {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--sky-100);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
}

.user-menu-logout { color: #fda4af !important; }
.user-menu-logout:hover { background: rgba(244,63,94,0.15) !important; color: #fff !important; }

/* ── Page Layout ─────────────────────────────────────────────── */
.page-wrapper {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  min-height: calc(100vh - 60px);
  display: flex;
  flex-direction: column;
}

.page-title {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.page-title .title-icon { font-size: 1.8rem; }

/* ── Glass Cards ─────────────────────────────────────────────── */
.card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: 1.75rem;
  box-shadow: var(--glass-shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}

.card:hover { transform: translateY(-2px); box-shadow: 0 12px 40px rgba(0,0,0,0.4); }

.card-sm { padding: 1.25rem; border-radius: var(--radius-lg); }

/* ── Module Card Grid ────────────────────────────────────────── */
.module-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
  margin-top: 1rem;
}

.module-card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: 2rem 1.5rem;
  text-align: center;
  text-decoration: none;
  color: var(--text-primary);
  transition: all 0.3s cubic-bezier(0.34,1.56,0.64,1);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.module-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--glass-bg-md), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}

.module-card:hover {
  transform: translateY(-6px) scale(1.02);
  border-color: var(--accent);
  box-shadow: 0 16px 48px rgba(14,165,233,0.2), var(--glass-shadow);
  color: white;
}

.module-card:hover::before { opacity: 1; }

.module-card .card-icon {
  font-size: 2.8rem;
  line-height: 1;
  filter: drop-shadow(0 2px 8px rgba(56,189,248,0.5));
  transition: transform 0.3s cubic-bezier(0.34,1.56,0.64,1);
}

.module-card:hover .card-icon { transform: scale(1.15) translateY(-3px); }

.module-card .card-label {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--sky-200);
}

.module-card:hover .card-label { color: white; }

.module-card .card-desc {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.4;
  text-align: center;
}

.module-card:hover .card-desc { color: rgba(255,255,255,0.7); }

/* ── Auth / Login ────────────────────────────────────────────── */
.auth-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.auth-card {
  width: 100%;
  max-width: 440px;
  background: var(--glass-bg-md);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  box-shadow: var(--glass-shadow);
  animation: slideUp 0.4s ease;
}

.auth-logo {
  text-align: center;
  margin-bottom: 2rem;
}

.auth-logo .logo-icon { font-size: 3.5rem; display: block; line-height: 1; }

.auth-logo h1 {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--accent);
  margin-top: 0.5rem;
  letter-spacing: -0.5px;
}

.auth-logo p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Forms ───────────────────────────────────────────────────── */
.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--sky-200);
  margin-bottom: 0.4rem;
  letter-spacing: 0.3px;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  background: rgba(255,255,255,0.07);
  border: 1.5px solid rgba(255,255,255,0.18);
  border-radius: var(--radius-md);
  padding: 0.7rem 1rem;
  font-size: 0.95rem;
  color: var(--text-primary);
  font-family: var(--font);
  transition: border-color var(--transition), background var(--transition), box-shadow var(--transition);
  outline: none;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--accent);
  background: rgba(56,189,248,0.07);
  box-shadow: 0 0 0 3px rgba(56,189,248,0.18);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

/* ── Buttons ─────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.65rem 1.5rem;
  border: none;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--font);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--sky-500), var(--sky-600));
  color: white;
  box-shadow: 0 4px 15px rgba(14,165,233,0.35);
}
.btn-primary:hover {
  background: linear-gradient(135deg, var(--sky-400), var(--sky-500));
  box-shadow: 0 6px 20px rgba(14,165,233,0.5);
  transform: translateY(-1px);
  color: white;
}

.btn-secondary {
  background: var(--glass-bg-md);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
}
.btn-secondary:hover {
  background: var(--glass-bg-lg);
  color: white;
}

.btn-danger {
  background: rgba(244,63,94,0.15);
  border: 1px solid rgba(244,63,94,0.35);
  color: #fda4af;
}
.btn-danger:hover {
  background: rgba(244,63,94,0.28);
  color: white;
}

.btn-success {
  background: rgba(16,185,129,0.18);
  border: 1px solid rgba(16,185,129,0.4);
  color: #6ee7b7;
}
.btn-success:hover {
  background: rgba(16,185,129,0.32);
  color: white;
}

.btn-full { width: 100%; }
.btn-sm   { padding: 0.4rem 0.9rem; font-size: 0.85rem; }
.btn-icon { padding: 0.5rem; border-radius: var(--radius-sm); }

/* ── Alerts ──────────────────────────────────────────────────── */
.alert {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  margin-bottom: 1rem;
  border: 1px solid transparent;
}

.alert-error   { background: rgba(244,63,94,0.12);  border-color: rgba(244,63,94,0.3);  color: #fda4af; }
.alert-success { background: rgba(16,185,129,0.12); border-color: rgba(16,185,129,0.3); color: #6ee7b7; }
.alert-info    { background: rgba(56,189,248,0.12); border-color: rgba(56,189,248,0.3); color: var(--sky-200); }
.alert-warn    { background: rgba(245,158,11,0.12); border-color: rgba(245,158,11,0.3); color: #fcd34d; }

/* ── Tables ──────────────────────────────────────────────────── */
.table-wrap {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.cloud-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.cloud-table thead th {
  background: rgba(56,189,248,0.12);
  color: var(--sky-300);
  font-weight: 600;
  padding: 0.85rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--glass-border);
  white-space: nowrap;
}

.cloud-table tbody tr {
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: background var(--transition);
}

.cloud-table tbody tr:hover { background: var(--glass-bg); }

.cloud-table td {
  padding: 0.75rem 1rem;
  color: var(--text-primary);
  vertical-align: middle;
}

.cloud-table td a { color: var(--accent); text-decoration: none; }
.cloud-table td a:hover { color: white; text-decoration: underline; }

/* ── Split Layout (sidebar + main) ──────────────────────────── */
.split-layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 1.5rem;
  flex: 1;
}

.split-layout .sidebar { display: flex; flex-direction: column; gap: 1rem; }
.split-layout .main-panel { overflow: hidden; }

/* ── File Manager ────────────────────────────────────────────── */
.file-row {
  display: grid;
  grid-template-columns: 2rem 1fr 140px 80px 48px;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 1rem;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}

.file-row:hover { background: var(--glass-bg); }

.file-row .file-icon { font-size: 1.2rem; text-align: center; }
.file-row .file-name { font-size: 0.92rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.file-row.is-dir .file-name { color: var(--sky-300); font-weight: 600; }
.file-row .file-meta { color: var(--text-muted); font-size: 0.82rem; }

/* ── Upload Progress ─────────────────────────────────────────── */
.progress-bar-wrap {
  height: 8px;
  background: rgba(255,255,255,0.1);
  border-radius: 4px;
  overflow: hidden;
  margin-top: 0.5rem;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--sky-500), var(--sky-400));
  border-radius: 4px;
  transition: width 0.2s ease;
  width: 0%;
}

/* ── Storage Bar ─────────────────────────────────────────────── */
.storage-bar-wrap {
  height: 12px;
  background: rgba(255,255,255,0.1);
  border-radius: 6px;
  overflow: hidden;
  margin: 0.5rem 0;
}

.storage-bar-fill {
  height: 100%;
  border-radius: 6px;
  background: linear-gradient(90deg, var(--sky-500), var(--sky-400));
  transition: width 0.6s ease;
}

.storage-bar-fill.warn  { background: linear-gradient(90deg, #f59e0b, #fbbf24); }
.storage-bar-fill.crit  { background: linear-gradient(90deg, #f43f5e, #fb7185); }

/* ── Breadcrumb / PWD ────────────────────────────────────────── */
.pwd-bar {
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
  font-family: 'Consolas', 'Courier New', monospace;
  color: var(--sky-300);
  word-break: break-all;
}

/* ── IDE ─────────────────────────────────────────────────────── */
.ide-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  grid-template-rows: auto 1fr;
  gap: 1rem;
  flex: 1;
  min-height: 0;
}

.ide-editor-wrap,
.ide-output-wrap {
  background: rgba(0,0,0,0.35);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.ide-panel-label {
  background: rgba(255,255,255,0.05);
  padding: 0.5rem 1rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.5px;
  text-transform: uppercase;
  border-bottom: 1px solid var(--glass-border);
}

.ide-textarea {
  flex: 1;
  width: 100%;
  background: transparent;
  border: none;
  outline: none;
  color: #e2e8f0;
  font-family: 'Consolas', 'Courier New', monospace;
  font-size: 0.92rem;
  padding: 1rem;
  resize: none;
  line-height: 1.6;
}

.ide-textarea::placeholder { color: var(--text-muted); }

.ide-output-frame {
  flex: 1;
  border: none;
  background: transparent;
  width: 100%;
  min-height: 200px;
}

/* ── Forum ───────────────────────────────────────────────────── */
.thread-row {
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  border-radius: var(--radius-lg);
  border: 1px solid transparent;
  transition: all var(--transition);
  cursor: pointer;
  text-decoration: none;
  color: var(--text-primary);
}

.thread-row:hover {
  background: var(--glass-bg);
  border-color: var(--glass-border);
  color: white;
}

.thread-row .thread-title { font-weight: 600; font-size: 0.95rem; color: var(--sky-200); }
.thread-row .thread-meta  { font-size: 0.8rem;  color: var(--text-muted); margin-top: 0.2rem; }
.thread-row .thread-badge {
  background: rgba(56,189,248,0.12);
  border: 1px solid rgba(56,189,248,0.3);
  color: var(--sky-300);
  font-size: 0.75rem;
  padding: 0.2rem 0.6rem;
  border-radius: 20px;
  white-space: nowrap;
}

/* ── Stat Cards ──────────────────────────────────────────────── */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px,1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.stat-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  text-align: center;
}

.stat-card .stat-value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
}

.stat-card .stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.35rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ── Footer ──────────────────────────────────────────────────── */
.footer {
  text-align: center;
  padding: 1.5rem;
  color: var(--text-muted);
  font-size: 0.8rem;
  border-top: 1px solid rgba(255,255,255,0.06);
  margin-top: auto;
}

/* ── Utilities ───────────────────────────────────────────────── */
.text-accent   { color: var(--accent); }
.text-muted    { color: var(--text-muted); }
.text-danger   { color: #fda4af; }
.text-success  { color: #6ee7b7; }
.text-center   { text-align: center; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.w-full { width: 100%; }
.hidden { display: none !important; }
.scrollable { overflow-y: auto; }
.mono { font-family: 'Consolas', 'Courier New', monospace; }

/* ── Scrollbar Styling ───────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: rgba(255,255,255,0.04); }
::-webkit-scrollbar-thumb { background: rgba(56,189,248,0.35); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(56,189,248,0.6); }

/* ── Selection ───────────────────────────────────────────────── */
::selection { background: rgba(56,189,248,0.3); color: white; }

/* ── Hamburger button ────────────────────────────────────────── */
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 36px; height: 36px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
}
.nav-hamburger span {
  display: block;
  width: 18px; height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
  transition: transform 0.22s ease, opacity 0.22s ease;
  transform-origin: center;
}
.nav-hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger.active span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav-hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── Mobile nav slide-down panel ─────────────────────────────── */
.mobile-nav-panel {
  display: none;
  position: fixed;
  top: 60px; left: 0; right: 0;
  background: rgba(10,25,47,0.98);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--glass-border);
  flex-direction: column;
  padding: 0.5rem 0.75rem 0.75rem;
  z-index: 99;
  transform: translateY(-105%);
  transition: transform 0.22s ease;
  box-shadow: var(--glass-shadow);
}
.mobile-nav-panel.open { transform: translateY(0); }
.mobile-nav-panel a {
  display: flex; align-items: center; gap: 0.6rem;
  padding: 0.75rem 0.75rem;
  color: var(--text-primary); text-decoration: none;
  font-size: 0.95rem; border-radius: var(--radius-sm);
  transition: background var(--transition), color var(--transition);
}
.mobile-nav-panel a:hover { background: var(--glass-bg-md); color: var(--accent); }
.mobile-nav-panel .mobile-nav-sep {
  height: 1px; background: var(--glass-border); margin: 0.35rem 0;
}
.mobile-nav-panel .mobile-nav-logout { color: #fda4af !important; }
.mobile-nav-panel .mobile-nav-logout:hover { background: rgba(244,63,94,0.15) !important; color: #fff !important; }

/* ── Responsive ──────────────────────────────────────────────── */
@media (max-width: 900px) {
  .split-layout { grid-template-columns: 1fr; }
  .ide-layout   { grid-template-columns: 1fr; }
  .module-grid  { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  /* Navbar: hide page links, show hamburger */
  .navbar { padding: 0 1rem; }
  .navbar-links > a,
  .navbar-links > button:not(.nav-hamburger) { display: none; }
  .nav-hamburger { display: flex; }
  .mobile-nav-panel { display: flex; }

  /* User menu dropdown: full width */
  .user-menu-dropdown {
    position: fixed;
    top: 60px; left: 0; right: 0;
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    min-width: unset;
  }

  /* Layout */
  .page-wrapper { padding: 1rem; }
  .module-grid  { grid-template-columns: 1fr; }
  .stat-grid    { grid-template-columns: repeat(2, 1fr); }
  .split-layout { grid-template-columns: 1fr; }
  .card         { padding: 1.25rem; }
  .module-card  { padding: 1.5rem 1rem; }

  /* Auth */
  .auth-page  { padding: 1rem; }
  .auth-card  { padding: 1.5rem 1.25rem; }

  /* Tables: horizontal scroll */
  .cloud-table { font-size: 0.82rem; }
  .cloud-table thead th,
  .cloud-table td { padding: 0.6rem 0.65rem; }

  /* File manager */
  .file-row { grid-template-columns: 2rem 1fr 48px; }
  .file-row .file-meta { display: none; }

  /* Page title */
  .page-title { font-size: 1.25rem; }
}