:root {
  color-scheme: light;
  --bg: #f4f1eb;
  --bg-strong: #e9e1d4;
  --surface: rgba(255, 252, 247, 0.95);
  --surface-strong: #fffaf2;
  --text: #1f2933;
  --muted: #556270;
  --accent: #2d5b59;
  --accent-strong: #1f4341;
  --accent-soft: #d8e7e2;
  --border: rgba(79, 90, 101, 0.18);
  --shadow: 0 18px 45px rgba(31, 41, 51, 0.08);
  --shadow-soft: 0 10px 25px rgba(31, 41, 51, 0.05);
  --radius-lg: 1.5rem;
  --radius-md: 1rem;
  --radius-sm: 0.75rem;
  --space-1: 0.5rem;
  --space-2: 0.75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 4.5rem;
  --container: 1160px;
}

html {
  scroll-behavior: smooth;
}

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

body {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  color: var(--text);
  background:
    radial-gradient(circle at top right, rgba(45, 91, 89, 0.12), transparent 30%),
    radial-gradient(circle at bottom left, rgba(201, 178, 139, 0.12), transparent 35%),
    linear-gradient(180deg, #faf7f1 0%, var(--bg) 100%);
  line-height: 1.6;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  z-index: 1000;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--accent-strong);
  color: #ffffff;
}

.skip-link:focus {
  top: 1rem;
}

.container {
  width: min(100% - 2rem, var(--container));
  margin: 0 auto;
}

.section {
  padding: var(--space-7) 0;
  scroll-margin-top: 6.5rem;
}

.section-alt {
  background: rgba(255, 248, 237, 0.65);
  border-top: 1px solid rgba(79, 90, 101, 0.08);
  border-bottom: 1px solid rgba(79, 90, 101, 0.08);
}

.eyebrow {
  margin: 0 0 var(--space-2);
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.1;
  color: var(--text);
}

h1 {
  font-size: clamp(2.4rem, 7vw, 4.8rem);
}

h2 {
  font-size: clamp(2rem, 5vw, 3.25rem);
}

h3 {
  font-size: clamp(1.25rem, 3vw, 1.7rem);
}

p {
  margin: 0;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  background: rgba(250, 247, 241, 0.7);
  border-bottom: 1px solid rgba(79, 90, 101, 0.08);
}

.header-inner {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  padding: 0.35rem 0;
}

.brand {
  display: inline-flex;
  align-items: center;
}

.brand-wordmark {
  width: min(170px, 42vw);
  height: auto;
  display: block;
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-list a {
  display: inline-flex;
  padding: 0.2rem 0;
  position: relative;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color: var(--muted);
  transition: color 0.2s ease;
}

.nav-list a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: left;
  background: var(--accent);
  transition: transform 0.2s ease;
}

.nav-list a:hover,
.nav-list a:focus-visible {
  color: var(--accent-strong);
}

.nav-list a:hover::after,
.nav-list a:focus-visible::after {
  transform: scaleX(1);
}

.hero {
  padding-top: var(--space-6);
}

.hero-grid,
.section-grid,
.register-layout,
.contact-grid,
.calendar-layout {
  display: grid;
  gap: var(--space-5);
}

.hero-copy {
  display: grid;
  gap: var(--space-4);
}

.hero-text,
.section-content,
.register-intro p,
.contact-grid p {
  color: var(--muted);
  max-width: 65ch;
}

.hero-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3.25rem;
  padding: 0.8rem 1.25rem;
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  font-weight: 600;
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease,
    background-color 0.2s ease,
    color 0.2s ease,
    border-color 0.2s ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
}

.button-primary {
  background: var(--accent-strong);
  color: #ffffff;
  box-shadow: var(--shadow-soft);
}

.button-primary:hover,
.button-primary:focus-visible {
  background: var(--accent);
}

.button-secondary {
  background: transparent;
  border-color: rgba(45, 91, 89, 0.25);
  color: var(--accent-strong);
}

.button-secondary:hover,
.button-secondary:focus-visible {
  background: rgba(45, 91, 89, 0.08);
}

.hero-panel,
.calendar-card,
.day-panel,
.project-card,
.register-panel,
.contact-card,
.event-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.hero-panel {
  display: grid;
  gap: var(--space-3);
  padding: var(--space-4);
}

.stat-card {
  padding: 1.25rem;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.92), rgba(216, 231, 226, 0.75));
  border: 1px solid rgba(45, 91, 89, 0.08);
}

.stat-value {
  display: block;
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent-strong);
}

.stat-label {
  color: var(--muted);
}

.section-grid {
  align-items: start;
}

.section-content {
  display: grid;
  gap: var(--space-3);
}

.section-header {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
}

.filter-group,
.tab-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.filter-button,
.tab-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(45, 91, 89, 0.18);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.75);
  min-height: 2.65rem;
  padding: 0.7rem 1.1rem;
  color: var(--muted);
  transition:
    background-color 0.2s ease,
    color 0.2s ease,
    border-color 0.2s ease;
}

[data-seminar-tab] {
  min-width: 10.5rem;
}

.filter-button:hover,
.filter-button:focus-visible,
.tab-button:hover,
.tab-button:focus-visible,
.filter-button.is-active,
.tab-button.is-active {
  background: var(--accent-strong);
  color: #ffffff;
  border-color: var(--accent-strong);
}

.event-list {
  display: grid;
  gap: var(--space-4);
}

.event-card {
  padding: var(--space-4);
}

.event-card time,
.event-meta {
  display: block;
  margin-top: 0.4rem;
  color: var(--muted);
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

.event-card p {
  margin-top: var(--space-3);
  color: var(--muted);
}

.event-card .button {
  margin-top: var(--space-4);
}

.past-seminar-intro {
  margin-bottom: var(--space-4);
  color: var(--muted);
}

.past-seminar-list {
  display: grid;
  gap: var(--space-4);
}

.past-seminar-card {
  display: grid;
  gap: 0.9rem;
  padding: var(--space-4);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.past-seminar-index {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.45rem;
  width: 8.5rem;
  min-width: 8.5rem;
  max-width: 8.5rem;
  height: 2.65rem;
  min-height: 2.65rem;
  max-height: 2.65rem;
  padding: 0.25rem 0.5rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.past-seminar-label {
  padding-left: 0.2rem;
}

.past-seminar-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.9rem;
  height: 1.9rem;
  border-radius: 50%;
  background: #ffffff;
  border: 1px solid rgba(45, 91, 89, 0.2);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

.past-seminar-card p {
  color: var(--muted);
}

.past-seminar-card .button {
  width: 8.5rem;
  min-width: 8.5rem;
  max-width: 8.5rem;
  height: 2.65rem;
  min-height: 2.65rem;
  max-height: 2.65rem;
  padding: 0;
  display: inline-flex;
  flex: 0 0 8.5rem;
  justify-content: center;
  align-items: center;
}

.calendar-layout {
  margin-top: var(--space-6);
  grid-template-columns: minmax(0, 1fr);
}

.calendar-card,
.day-panel {
  padding: var(--space-4);
}

.day-panel h3 {
  margin-top: 0.25rem;
}

.calendar-header {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.calendar-month {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color: var(--muted);
}

.calendar-embed {
  overflow: hidden;
  border: 1px solid rgba(79, 90, 101, 0.12);
  border-radius: 1rem;
  background: rgba(255, 255, 255, 0.82);
}

.calendar-embed iframe {
  width: 100%;
  min-height: 520px;
  border: 0;
  display: block;
}

.calendar-note {
  margin-top: 1rem;
  color: var(--muted);
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  font-size: 0.92rem;
}

.calendar-weekdays,
.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 0.4rem;
}

.calendar-weekdays {
  margin-bottom: 0.5rem;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  font-size: 0.85rem;
  color: var(--muted);
}

.calendar-day {
  min-height: 4.4rem;
  border: 1px solid rgba(79, 90, 101, 0.12);
  border-radius: 0.9rem;
  background: rgba(255, 255, 255, 0.8);
  padding: 0.65rem;
  text-align: left;
  transition:
    border-color 0.2s ease,
    transform 0.2s ease,
    background-color 0.2s ease;
}

.calendar-day:hover,
.calendar-day:focus-visible {
  transform: translateY(-1px);
  border-color: rgba(45, 91, 89, 0.35);
}

.calendar-day.is-empty {
  visibility: hidden;
}

.calendar-day.is-has-event {
  background: rgba(216, 231, 226, 0.9);
  border-color: rgba(45, 91, 89, 0.25);
}

.calendar-day.is-selected {
  background: var(--accent-strong);
  color: #ffffff;
}

.calendar-day-number {
  display: block;
  font-weight: 700;
}

.calendar-day-count {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.8rem;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

#day-panel-content {
  display: grid;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.day-event {
  padding: 1.5rem;
  border-radius: var(--radius-md);
  background: rgba(216, 231, 226, 0.45);
  border: 1px solid rgba(45, 91, 89, 0.12);
}

.day-event h3 {
  margin-bottom: 0.9rem;
}

.day-event p {
  margin-top: 0.85rem;
  color: var(--muted);
}

.project-grid {
  display: grid;
  gap: var(--space-4);
}

.project-card {
  padding: var(--space-4);
}

.project-card p {
  margin-top: var(--space-3);
  color: var(--muted);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  font-size: 0.8rem;
}

.register-panel {
  padding: var(--space-4);
}

.tab-panel {
  margin-top: var(--space-4);
}

.registration-form {
  display: grid;
  gap: var(--space-4);
}

.field-grid {
  display: grid;
  gap: var(--space-3);
}

.field {
  display: grid;
  gap: 0.45rem;
}

.field label,
.checkbox-field {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

.field input,
.field textarea {
  width: 100%;
  padding: 0.85rem 1rem;
  border: 1px solid rgba(79, 90, 101, 0.18);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.85);
  color: var(--text);
}

.field input:focus,
.field textarea:focus {
  outline: 2px solid rgba(45, 91, 89, 0.2);
  border-color: rgba(45, 91, 89, 0.35);
}

.field input[aria-invalid="true"],
.field textarea[aria-invalid="true"] {
  border-color: #a33d2f;
  background: rgba(255, 247, 245, 0.95);
}

.checkbox-field {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  color: var(--muted);
}

.checkbox-field input {
  margin-top: 0.2rem;
}

.form-message {
  min-height: 1.5rem;
  color: var(--accent-strong);
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

.form-message.is-error {
  color: #8c2f25;
}

.contact-grid {
  align-items: start;
}

.contact-card {
  padding: var(--space-4);
  display: grid;
  gap: 0.9rem;
}

.social-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 0.5rem;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

.social-links a {
  color: var(--accent);
}

.social-links a:hover,
.social-links a:focus-visible {
  color: var(--accent-strong);
}

.site-footer {
  padding: 2rem 0 3rem;
}


.footer-social {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.social-icon-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 0.85rem;
  border: 1px solid rgba(79, 90, 101, 0.2);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.75);
  color: var(--accent-strong);
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  font-size: 0.92rem;
  transition: transform 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.social-icon-link svg {
  width: 1.1rem;
  height: 1.1rem;
  fill: currentColor;
}

.social-icon-link:hover,
.social-icon-link:focus-visible {
  transform: translateY(-1px);
  border-color: rgba(45, 91, 89, 0.4);
  background: rgba(216, 231, 226, 0.8);
}

.empty-state {
  padding: 1.25rem;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.7);
  border: 1px dashed rgba(79, 90, 101, 0.18);
  color: var(--muted);
}

@media (min-width: 700px) {
  .header-inner,
  .section-header,
  .calendar-header {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .hero-actions {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .field-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .hero-grid,
  .register-layout,
  .contact-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.85fr);
    align-items: start;
  }

  .section-grid {
    grid-template-columns: minmax(0, 0.7fr) minmax(0, 1.3fr);
  }

  .project-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .event-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .past-seminar-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1120px) {
  .event-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .past-seminar-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .project-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}