@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&family=Merriweather:wght@700&display=swap');

:root {
  --bg: #EDECE8;          /* eggshell */
  --card-bg: #FFFFFF;
  --blue-dark: #124469;   /* main accent */
  --blue-light: #5196C7;
  --text-main: #111827;
  --text-muted: #6B7280;
  --text-soft: #9CA3AF;
  --border: #D1D5DB;
  --border-subtle: #E5E7EB;
  --error: #B91C1C;
  --success: #15803D;
  --radius-lg: 14px;
  --radius-pill: 999px;
  --shadow-soft: 0 4px 18px rgba(0, 0, 0, 0.06);

  --font-serif: "Merriweather", Georgia, serif;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

/* ---------- Layout ---------- */

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 32px 16px 40px;
  background-color: var(--bg);   /* flat background */
  font-family: var(--font-sans);
  color: var(--text-main);
}

.container {
  width: 100%;
  max-width: 980px;
  margin: 0 auto;
}

/* ---------- Header / branding ---------- */

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 18px;
  flex-wrap: wrap;
}

.app-title {
  font-family: var(--font-serif);
  font-size: 2.3rem;
  font-weight: 700;
  margin: 0 0 4px;
  letter-spacing: -0.5px;
  color: var(--text-main);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 6px;
}

.connected-badge {
  font-size: 0.85rem;
  color: var(--success);
  font-weight: 500;
}

.btn-small {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 7px 16px;
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: background-color 0.15s ease, box-shadow 0.15s ease;
  border: none;
}

.btn-connect {
  color: #FFFFFF;
  background-color: var(--blue-dark);
  box-shadow: 0 2px 8px rgba(18, 68, 105, 0.2);
}

.btn-connect:hover {
  background-color: var(--blue-light);
}

.btn-outline {
  color: var(--text-muted);
  background: transparent;
  border: 1px solid var(--border);
  margin-top: 0;
  box-shadow: none;
}

.btn-outline:hover {
  background: #F3F4F6;
}

.connect-prompt {
  margin-top: 14px;
  padding: 14px 16px;
  border-radius: 10px;
  background: #FEF9E7;
  border: 1px solid #F5D56B;
  text-align: center;
}

.connect-prompt p {
  margin: 0 0 10px;
  font-size: 0.9rem;
  color: var(--text-main);
}

.app-tagline {
  margin-top: 0;
  margin-bottom: 18px;
  font-family: var(--font-sans);
  font-size: 0.96rem;
  color: var(--text-muted);
  max-width: 640px;
}

/* ---------- Cards ---------- */

.card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  padding: 18px 18px 20px;
  margin-bottom: 16px;
  box-shadow: var(--shadow-soft);
}

.card h2 {
  margin-top: 0;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
}

/* ---------- Messages ---------- */

.messages {
  margin-bottom: 14px;
}

.message {
  padding: 9px 11px;
  border-radius: 10px;
  font-size: 0.9rem;
  border: 1px solid var(--border);
  background: #F9FAFB;
}

.message + .message {
  margin-top: 6px;
}

.message.success {
  border-color: rgba(34, 197, 94, 0.35);
  background: #ECFDF3;
  color: var(--success);
}

.message.error {
  border-color: rgba(248, 113, 113, 0.4);
  background: #FEF2F2;
  color: var(--error);
}

/* ---------- Form Elements ---------- */

.field-label {
  display: block;
  margin: 12px 0 6px;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-soft);
}

input[type="text"],
input[type="number"],
input[type="time"],
input[type="date"],
textarea,
select {
  width: 100%;
  padding: 9px 11px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #FFFFFF;
  color: var(--text-main);
  font-size: 0.92rem;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

input[type="file"] {
  display: block;
  margin-top: 4px;
  font-size: 0.9rem;
  color: var(--text-soft);
}

input::placeholder,
textarea::placeholder {
  color: #9CA3AF;
}

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

input:focus,
textarea:focus,
select:focus {
  border-color: var(--blue-light);
  box-shadow: 0 0 0 1px rgba(81, 150, 199, 0.35);
}

/* year + semester row */
.inline-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.inline-row > div {
  flex: 1 1 160px;
}

/* Divider */

.divider {
  margin: 16px 0;
  text-align: center;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--text-soft);
  position: relative;
}

.divider::before,
.divider::after {
  content: "";
  position: absolute;
  top: 50%;
  width: 40%;
  height: 1px;
  background: var(--border);
}

.divider::before {
  left: 0;
}

.divider::after {
  right: 0;
}

/* ---------- Buttons ---------- */

button {
  margin-top: 16px;
  padding: 9px 18px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  cursor: pointer;
  color: #FFFFFF;
  background-color: var(--blue-dark);   /* flat */
  box-shadow: 0 3px 10px rgba(18, 68, 105, 0.25);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: background-color 0.15s ease, box-shadow 0.15s ease,
              transform 0.08s ease;
}

button:hover {
  background-color: var(--blue-light);
  box-shadow: 0 4px 14px rgba(18, 68, 105, 0.3);
}

button:active {
  transform: translateY(1px);
  box-shadow: 0 2px 8px rgba(18, 68, 105, 0.22);
}

/* ---------- Tables ---------- */

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 10px;
  font-size: 0.88rem;
}

th,
td {
  padding: 8px 9px;
  text-align: left;
}

thead th {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-soft);
  border-bottom: 1px solid var(--border);
}

tbody tr {
  border-bottom: 1px solid var(--border-subtle);
}

tbody tr:nth-child(odd) {
  background: #F9FAFB;
}

tbody tr:nth-child(even) {
  background: #FFFFFF;
}

tbody tr:hover {
  background: #E1ECF7;
}

td input[type="text"],
td input[type="time"],
td input[type="date"] {
  width: 100%;
  font-size: 0.85rem;
  padding: 6px 7px;
}

td input[type="checkbox"] {
  transform: scale(1.05);
}

/* ---------- Results card tweaks ---------- */

.results h2 {
  margin-bottom: 6px;
}

.results .subtitle {
  margin-bottom: 8px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* ---------- Loading Overlay (flat) ---------- */

.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
}

.loading-overlay.hidden {
  display: none;
}

.loading-card {
  background: #FFFFFF;
  padding: 18px 20px 16px;
  border-radius: 12px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-soft);
  text-align: center;
  max-width: 320px;
}

.loading-card h2 {
  margin: 10px 0 6px;
  font-size: 1rem;
}

.loading-card p {
  margin: 0;
  font-size: 0.86rem;
  color: var(--text-muted);
}

.spinner {
  width: 26px;
  height: 26px;
  margin: 0 auto;
  border-radius: 999px;
  border: 3px solid #E5E7EB;
  border-top-color: var(--blue-dark);
  animation: spin 0.7s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ---------- Responsive ---------- */

@media (max-width: 720px) {
  body {
    padding: 20px 10px 26px;
  }

  .app-title {
    font-size: 1.8rem;
  }

  .app-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .card {
    padding: 14px 14px 16px;
  }

  table {
    font-size: 0.8rem;
  }

  thead {
    display: none;
  }

  tbody tr {
    display: block;
    margin-bottom: 8px;
    border-radius: 10px;
    overflow: hidden;
  }

  tbody td {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 6px;
    padding: 6px 10px;
  }

  tbody td::before {
    content: attr(data-label);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--text-soft);
  }

  tbody td:first-child {
    justify-content: flex-start;
  }

  tbody td:first-child::before {
    content: "";
  }
}