:root {
  --bg: #0f172a;
  --surface: #1e293b;
  --surface2: #334155;
  --text: #f1f5f9;
  --muted: #94a3b8;
  --accent: #14b8a6;
  --accent-hover: #0d9488;
  --border: #475569;
  --danger: #f87171;
  --ok: #5eead4;
  --radius: 14px;
  --font: system-ui, "Segoe UI", Roboto, Ubuntu, sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.45;
}

a {
  color: var(--accent);
}

.app {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1rem 3rem;
  padding-top: max(0.75rem, env(safe-area-inset-top, 0));
}

.header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 0 1rem;
  border-bottom: 1px solid rgba(71, 85, 105, 0.5);
  margin-bottom: 1.25rem;
}

.header-brand {
  flex: 1 1 auto;
  min-width: 0;
}

.header-brand h1 {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 700;
}

.header-brand .subtitle {
  margin: 0.2rem 0 0;
  font-size: 0.85rem;
  color: var(--muted);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.55rem 1rem;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s, border-color 0.15s;
}

.btn:hover,
.btn:focus-visible {
  background: var(--surface2);
  border-color: var(--accent);
  outline: none;
}

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #042f2e;
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: #fff;
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.btn-sair {
  font-size: 0.85rem;
  color: var(--muted);
}

.card {
  background: rgba(30, 41, 59, 0.85);
  border: 1px solid rgba(71, 85, 105, 0.55);
  border-radius: var(--radius);
  padding: 1.1rem 1.15rem;
  margin-bottom: 1rem;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.22);
}

.card h2 {
  margin: 0 0 0.65rem;
  font-size: 1.05rem;
}

label.block {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.85rem;
  color: var(--muted);
}

textarea,
input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"] {
  width: 100%;
  padding: 0.65rem 0.75rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #0c1222;
  color: var(--text);
  font-size: 1rem;
  font-family: inherit;
}

input[type="file"] {
  width: 100%;
  padding: 0.55rem 0.65rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #0c1222;
  color: var(--muted);
  font-size: 0.9rem;
}

textarea:focus,
input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(20, 184, 166, 0.25);
}

textarea {
  min-height: 140px;
  resize: vertical;
}

.hint {
  font-size: 0.8rem;
  color: var(--muted);
  margin: 0.5rem 0 0;
}

.row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  margin-top: 0.75rem;
}

.flash-front {
  font-size: 1.15rem;
  font-weight: 600;
  min-height: 4rem;
  padding: 1rem;
  background: #0c1222;
  border-radius: 10px;
  border: 1px solid var(--border);
}

.flash-back {
  margin-top: 0.75rem;
  padding: 0.85rem;
  background: rgba(20, 184, 166, 0.12);
  border-radius: 10px;
  border: 1px solid rgba(20, 184, 166, 0.35);
  display: none;
}

.flash-back.visible {
  display: block;
}

.pill {
  display: inline-block;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  font-size: 0.75rem;
  background: var(--surface2);
  color: var(--muted);
}

.pack-list {
  margin: 0.5rem 0 0;
  padding: 0;
}

.pack-row {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 0.5rem 0.75rem;
  padding: 0.65rem 0;
  border-bottom: 1px solid rgba(71, 85, 105, 0.4);
  font-size: 0.9rem;
}

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

.pack-row-main {
  flex: 1 1 180px;
  min-width: 0;
}

.pack-row-title {
  font-weight: 600;
  color: var(--text);
  word-break: break-word;
}

.pack-row-meta {
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 0.2rem;
}

.pack-row-actions {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.pack-row-actions label {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8rem;
  color: var(--muted);
  cursor: pointer;
  margin: 0;
  white-space: nowrap;
}

.pack-row-actions input[type="checkbox"] {
  width: auto;
  accent-color: var(--accent);
  cursor: pointer;
}

.btn-icon {
  padding: 0.35rem 0.5rem;
  font-size: 1.1rem;
  line-height: 1;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  cursor: pointer;
}

.btn-icon:hover,
.btn-icon:focus-visible {
  border-color: var(--danger);
  background: rgba(248, 113, 113, 0.12);
  outline: none;
}

.select-materia {
  width: 100%;
  max-width: 100%;
  padding: 0.55rem 0.75rem;
  margin-bottom: 0.65rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #0c1222;
  color: var(--text);
  font-size: 1rem;
  font-family: inherit;
}

.select-materia:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(20, 184, 166, 0.25);
}

.bizu-list {
  margin: 0;
  padding-left: 1.1rem;
}

.bizu-list li {
  margin-bottom: 0.35rem;
}

.msg-erro {
  display: none;
  margin-top: 0.75rem;
  padding: 0.55rem 0.75rem;
  border-radius: 8px;
  background: rgba(248, 113, 113, 0.12);
  border: 1px solid rgba(248, 113, 113, 0.45);
  color: #fecaca;
  font-size: 0.875rem;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  max-height: 12rem;
  overflow-y: auto;
}

.msg-erro.ativo {
  display: block;
}

.msg-ok {
  display: none;
  margin-top: 0.75rem;
  padding: 0.55rem 0.7rem;
  border-radius: 8px;
  background: rgba(20, 184, 166, 0.12);
  border: 1px solid rgba(20, 184, 166, 0.45);
  color: var(--ok);
  font-size: 0.875rem;
}

.msg-ok.ativo {
  display: block;
}

.hidden {
  display: none !important;
}