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

:root {
  --bg: #f5f0e8;
  --surface: #ffffff;
  --border: #ddd5c0;
  --primary: #5b6e4a;
  --primary-hover: hwb(93 23% 65%);
  --danger: #b85c5c;
  --danger-hover: #9a4a4a;
  --text: #2c2c2c;
  --muted: #7a7060;
  --status-new: #8a7a5a;
  --status-learning: #4a7a9b;
  --status-done: #4a8a5a;
  --status-new-bg: #f0e8d0;
  --status-learning-bg: #d0e4f0;
  --status-done-bg: #d0ecd8;
  --sidebar-width: 220px;
}

body {
  font-family: 'Georgia', serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  border-radius: 6px;
  font-size: 0.9rem;
  padding: 0.5rem 1.1rem;
  transition: background 0.15s, transform 0.1s;
}

button:active { transform: scale(0.97); }

.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }

.btn-danger {
  background: transparent;
  color: var(--danger);
  border: 1px solid var(--danger);
  padding: 0.3rem 0.7rem;
  font-size: 0.8rem;
}

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

.btn-cancel {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
}

.btn-cancel:hover { background: var(--border); color: var(--text); }

/* ── Layout ───────────────────────────────────────────────────── */
.layout {
  display: flex;
  min-height: 100vh;
}

/* ── Sidebar ──────────────────────────────────────────────────── */
.sidebar {
  width: var(--sidebar-width);
  background: var(--primary);
  color: #fff;
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

.sidebar-header {
  padding: 1.5rem 1.25rem 1rem;
  border-bottom: 1px solid rgba(255,255,255,0.15);
}

.sidebar-title {
  font-size: 1.4rem;
  letter-spacing: 0.04em;
  font-weight: normal;
}

.sidebar-nav {
  flex: 1;
  padding: 1rem 0;
  display: flex;
  flex-direction: column;
}

.sidebar-link {
  display: block;
  padding: 0.75rem 1.25rem;
  color: rgba(255,255,255,0.8);
  text-decoration: none;
  font-size: 0.95rem;
  transition: background 0.15s, color 0.15s;
  border-left: 3px solid transparent;
}

.sidebar-link:hover {
  background: rgba(255,255,255,0.1);
  color: #fff;
}

.sidebar-link.active {
  background: rgba(255,255,255,0.15);
  color: #fff;
  border-left-color: #fff;
  font-weight: bold;
}

.sidebar-footer {
  padding: 1rem 1.25rem;
  border-top: 1px solid rgba(255,255,255,0.15);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.sidebar-username {
  font-size: 0.85rem;
  opacity: 0.8;
  word-break: break-all;
}

.btn-logout {
  background: rgba(255,255,255,0.15);
  color: #fff;
  border: 1px solid rgba(255,255,255,0.3);
  font-size: 0.8rem;
  padding: 0.3rem 0.8rem;
  border-radius: 6px;
  align-self: flex-start;
}

.btn-logout:hover { background: rgba(255,255,255,0.25); }

/* ── Page content ─────────────────────────────────────────────── */
.page-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.page-main {
  max-width: 900px;
  margin: 2rem auto;
  padding: 0 1.5rem;
  width: 100%;
}

/* ── Mobile top bar ───────────────────────────────────────────── */
.mobile-topbar {
  display: none;
  background: var(--primary);
  color: #fff;
  padding: 0.75rem 1rem;
  align-items: center;
  gap: 1rem;
}

.mobile-topbar-title {
  font-size: 1.2rem;
  letter-spacing: 0.04em;
}

.hamburger-btn {
  background: transparent;
  border: none;
  color: #fff;
  font-size: 1.4rem;
  padding: 0.25rem 0.4rem;
  line-height: 1;
  cursor: pointer;
  transition: opacity 0.15s;
}

.hamburger-btn:hover { opacity: 0.8; }

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 99;
}

/* ── Auth overlay ─────────────────────────────────────────────── */
.auth-overlay {
  position: fixed;
  inset: 0;
  background: rgba(245, 240, 232, 0.97);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.auth-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 2.5rem 2.25rem;
  width: 100%;
  max-width: 380px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.12);
  text-align: center;
}

.auth-box h2 {
  font-size: 2rem;
  font-weight: normal;
  color: var(--primary);
  letter-spacing: 0.04em;
  margin-bottom: 0.25rem;
}

.auth-tagline {
  color: var(--muted);
  font-style: italic;
  font-size: 0.88rem;
  margin-bottom: 2rem;
}

.auth-form { display: flex; flex-direction: column; gap: 0.75rem; }

.pw-wrap {
  position: relative;
  display: flex;
}

.pw-wrap input {
  flex: 1;
  padding-right: 3.25rem !important;
}

.btn-eye {
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  background: transparent;
  border: none;
  color: var(--muted);
  padding: 0 0.75rem;
  font-size: 0.75rem;
  letter-spacing: 0.02em;
  border-radius: 0 6px 6px 0;
  min-width: 2.75rem;
  cursor: pointer;
  transition: color 0.15s;
}

.btn-eye:hover { color: var(--text); }
.btn-eye:active { transform: none; }

.auth-form input {
  font-family: inherit;
  font-size: 0.95rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.6rem 0.85rem;
  background: var(--bg);
  color: var(--text);
  outline: none;
  transition: border-color 0.15s;
  text-align: left;
}

.auth-form input:focus { border-color: var(--primary); }

.auth-form .btn-primary {
  width: 100%;
  margin-top: 0.25rem;
  padding: 0.65rem;
  font-size: 0.95rem;
}

.auth-forgot {
  font-size: 0.8rem;
  text-align: right;
  margin-top: -0.25rem;
}

.auth-forgot a {
  color: var(--muted);
  text-decoration: none;
  cursor: pointer;
}

.auth-forgot a:hover { text-decoration: underline; }

.auth-forgot-desc {
  font-size: 0.88rem;
  color: var(--muted);
  font-style: italic;
  margin-bottom: 0.25rem;
}

.auth-switch {
  margin-top: 1.25rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.auth-switch a {
  color: var(--primary);
  text-decoration: none;
  cursor: pointer;
  font-weight: bold;
}

.auth-switch a:hover { text-decoration: underline; }

.auth-error {
  color: var(--danger);
  font-size: 0.85rem;
  min-height: 1.2em;
  margin-top: 0.75rem;
}

/* ── Shared form elements ─────────────────────────────────────── */
.form-group { display: flex; flex-direction: column; gap: 0.3rem; }

.form-group label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.form-group input,
.form-group textarea,
.form-group select {
  font-family: inherit;
  font-size: 0.95rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.5rem 0.75rem;
  background: var(--bg);
  color: var(--text);
  resize: vertical;
  outline: none;
  transition: border-color 0.15s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus { border-color: var(--primary); }

.form-group textarea { min-height: 80px; }

.form-actions { display: flex; gap: 0.75rem; justify-content: flex-end; }

/* ── Responsive ───────────────────────────────────────────────── */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    z-index: 100;
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar-overlay.visible {
    display: block;
  }

  .mobile-topbar {
    display: flex;
  }

  .auth-box { margin: 1rem; padding: 2rem 1.5rem; }
}