:root {
  --primary: #f23a2e;
  --primary-dark: #d92e23;
  --bg: #fff8f6;
  --card: #ffffff;
  --text: #2f2f2f;
  --muted: #6f6f6f;
  --border: #f0d5d2;
  --success-bg: #ecfdf3;
  --success-text: #027a48;
  --danger-bg: #fff1f0;
  --danger-text: #b42318;
  --shadow: 0 18px 50px rgba(242, 58, 46, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  background: linear-gradient(135deg, #fffaf8 0%, #ffecea 100%);
  color: var(--text);
  min-height: 100vh;
}

/* Modern app navigation */
.app-navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid #eee;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.nav-logo img {
  height: 42px;
  display: block;
}

.nav-links {
  display: flex;
  gap: 26px;
  align-items: center;
}

.nav-link {
  text-decoration: none;
  color: #333;
  font-weight: 700;
  position: relative;
  white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--primary);
  border-radius: 999px;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-button {
  background: var(--primary);
  color: white;
  padding: 8px 14px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 800;
  border: 0;
  cursor: pointer;
}

.nav-user {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 700;
}

.logout-btn {
  border: none;
  background: #eee;
  padding: 7px 11px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 700;
}

.logout-btn:hover {
  background: #ddd;
}

.page {
  max-width: 1080px;
  margin: 0 auto;
  padding: 30px 20px 56px;
}

.hero {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 18px;
  margin-bottom: 22px;
}

h1 {
  margin: 0;
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  letter-spacing: -0.04em;
}

.subhead {
  margin-top: 7px;
  color: var(--muted);
  font-size: 1rem;
}

.pill {
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.72);
  color: var(--muted);
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 0.88rem;
  white-space: nowrap;
}

.card {
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  border-radius: 24px;
  padding: 22px;
  backdrop-filter: blur(10px);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.field.full {
  grid-column: 1 / -1;
}

label {
  display: block;
  font-weight: 800;
  margin-bottom: 8px;
  font-size: 0.92rem;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px 14px;
  font-size: 1rem;
  background: white;
  color: var(--text);
  outline: none;
  font-family: inherit;
}

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

input:focus,
select:focus,
textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(242, 58, 46, 0.12);
}

.section-heading {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin: 26px 0 12px;
}

.section-heading h2 {
  margin: 0;
  font-size: 1.1rem;
}

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

.session-row {
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 18px;
  padding: 14px;
  display: grid;
  grid-template-columns: 1fr 1fr 140px auto;
  gap: 12px;
  align-items: end;
}

.button-row {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  margin-top: 22px;
  flex-wrap: wrap;
}

.primary-button,
.ghost-button,
.danger-button {
  border: 0;
  border-radius: 14px;
  padding: 12px 16px;
  cursor: pointer;
  font-weight: 800;
  transition: transform 0.18s ease, opacity 0.18s ease;
}

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

.primary-button {
  background: var(--primary);
  color: white;
}

.primary-button:disabled,
.ghost-button:disabled,
.danger-button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
}

.ghost-button {
  background: #fff;
  border: 1px solid var(--border);
  color: var(--text);
}

.danger-button {
  background: var(--danger-bg);
  color: var(--danger-text);
  border: 1px solid #ffd7d2;
}

.message {
  display: none;
  margin-bottom: 16px;
  border-radius: 16px;
  padding: 14px;
  font-weight: 700;
}

.message.visible {
  display: block;
}

.message.success {
  background: var(--success-bg);
  color: var(--success-text);
  border: 1px solid #b7ebc6;
}

.message.error {
  background: var(--danger-bg);
  color: var(--danger-text);
  border: 1px solid #ffd7d2;
}

.loading-screen {
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  font-weight: 800;
}

.hidden {
  display: none !important;
}

@media (max-width: 820px) {
  .nav-container {
    align-items: flex-start;
    flex-direction: column;
  }

  .nav-links {
    width: 100%;
    gap: 14px;
    overflow-x: auto;
    padding-bottom: 4px;
  }

  .nav-right {
    width: 100%;
    justify-content: flex-start;
  }

  .page {
    width: 100%;
    max-width: 540px;
    padding: 16px 12px 36px;
  }

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

  .card {
    width: 100%;
    max-width: 100%;
    margin: 0 auto;
    border-radius: 20px;
    padding: 16px;
  }

  .form-grid,
  .session-row {
    grid-template-columns: 1fr;
  }

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

  .button-row button,
  .session-row button {
    width: 100%;
  }
}