@import url("https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600&display=swap");

:root {
  --bg: #0d1117;
  --panel: rgba(255, 255, 255, 0.06);
  --panel-strong: rgba(255, 255, 255, 0.1);
  --border: rgba(255, 255, 255, 0.08);
  --text: #e6edf3;
  --muted: #9fb0c3;
  --accent: #7de2ff;
  --accent-strong: #2dd4bf;
  --error: #ff6b6b;
  --success: #5be49b;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at 20% 20%, #1f2937, #0d1117 40%),
    radial-gradient(circle at 80% 0%, #0ea5e9, transparent 25%),
    radial-gradient(circle at 60% 70%, #10b981, transparent 30%),
    #0d1117;
}

.page {
  max-width: 1100px;
  margin: 0 auto;
  padding: 64px 20px;
  display: grid;
  place-items: center;
}

.card {
  width: min(540px, 100%);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 32px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.auth-card {
  display: grid;
  gap: 20px;
}

.auth-header .eyebrow {
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 12px;
  color: var(--muted);
  margin: 0 0 4px;
}

.auth-header .title {
  margin: 0 0 8px;
  font-size: 26px;
  font-weight: 600;
}

.auth-header .subtitle {
  margin: 0;
  color: var(--muted);
  line-height: 1.4;
}

.tabs {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
  background: var(--panel-strong);
  padding: 6px;
  border-radius: 12px;
}

.tab {
  border: none;
  padding: 12px;
  background: transparent;
  color: var(--muted);
  border-radius: 10px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.tab.active {
  background: linear-gradient(120deg, var(--accent), var(--accent-strong));
  color: #0b1220;
  box-shadow: 0 10px 30px rgba(125, 226, 255, 0.35);
}

.form {
  display: grid;
  gap: 14px;
}

.field {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 14px;
}

.field input {
  width: 100%;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  font-size: 15px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.field input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(125, 226, 255, 0.25);
}

button.primary,
button.secondary {
  width: 100%;
  padding: 12px 16px;
  border-radius: 12px;
  border: none;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.12s ease, box-shadow 0.2s ease, background 0.2s ease;
}

button.primary {
  background: linear-gradient(120deg, var(--accent), var(--accent-strong));
  color: #0b1220;
  box-shadow: 0 10px 30px rgba(125, 226, 255, 0.35);
}

button.primary:hover {
  transform: translateY(-1px);
}

button.secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

button.secondary:hover {
  border-color: var(--accent);
}

.message {
  min-height: 20px;
  margin: 0;
  color: var(--muted);
  font-weight: 500;
}

.message[data-type="success"] {
  color: var(--success);
}

.message[data-type="error"] {
  color: var(--error);
}

.visible {
  display: grid;
}

.actions {
  display: flex;
  justify-content: flex-end;
}

.hint {
  padding: 14px;
  border-radius: 12px;
  background: var(--panel-strong);
  border: 1px dashed var(--border);
  color: var(--muted);
}

/* Homework Styles */
.homework-card {
  max-width: 800px;
  width: 100%;
}

.actions-row {
  display: flex;
  gap: 12px;
}

.actions-row button {
  flex: 1;
}

.task-form {
  background: var(--panel-strong);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  display: grid;
  gap: 16px;
}

.task-form h3 {
  margin: 0;
  font-size: 20px;
  color: var(--accent);
}

.task-form textarea {
  width: 100%;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  font-size: 15px;
  font-family: inherit;
  resize: vertical;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.task-form textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(125, 226, 255, 0.25);
}

.form-actions {
  display: flex;
  gap: 12px;
}

.form-actions button {
  flex: 1;
}

.task-list {
  display: grid;
  gap: 12px;
}

.task-item {
  background: var(--panel-strong);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  display: flex;
  gap: 14px;
  align-items: flex-start;
  transition: all 0.2s ease;
}

.task-item:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 20px rgba(125, 226, 255, 0.15);
}

.task-item.completed {
  opacity: 0.6;
}

.task-item.completed .task-title {
  text-decoration: line-through;
  color: var(--muted);
}

.task-checkbox input[type="checkbox"] {
  width: 22px;
  height: 22px;
  cursor: pointer;
  accent-color: var(--accent-strong);
}

.task-content {
  flex: 1;
  display: grid;
  gap: 6px;
}

.task-title {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
}

.task-desc {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
  line-height: 1.5;
}

.task-due {
  font-size: 13px;
  color: var(--accent);
  font-weight: 500;
}

.task-actions {
  display: flex;
  gap: 8px;
}

.icon-btn {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  cursor: pointer;
  font-size: 16px;
  transition: all 0.2s ease;
}

.icon-btn:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.icon-btn.delete:hover {
  border-color: var(--error);
}

.loading,
.hint-text,
.error {
  text-align: center;
  color: var(--muted);
  padding: 32px;
}

.error {
  color: var(--error);
}

@media (max-width: 640px) {
  .card {
    padding: 24px;
  }

  .auth-header .title {
    font-size: 22px;
  }

  .actions-row {
    flex-direction: column;
  }

  .task-item {
    flex-wrap: wrap;
  }

  .task-actions {
    width: 100%;
    justify-content: flex-end;
  }
}