/* ============ Buttons ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  padding: 0.85em 1.5em;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-weight: 600;
  font-size: var(--fs-body);
  cursor: pointer;
  white-space: nowrap;
  transition: transform var(--duration-fast) var(--ease-out-expo),
    box-shadow var(--duration-fast) var(--ease-out-expo),
    background-color var(--duration-fast) var(--ease-out-expo),
    color var(--duration-fast) var(--ease-out-expo),
    border-color var(--duration-fast) var(--ease-out-expo);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn:active {
  transform: translateY(0);
}

.btn svg {
  width: 1.1em;
  height: 1.1em;
  flex-shrink: 0;
}

.btn--primary {
  background: var(--accent);
  color: #fff;
  box-shadow: var(--shadow-sm);
}

.btn--primary:hover {
  background: var(--accent-hover);
  box-shadow: var(--shadow-md);
}

.btn--secondary {
  background: transparent;
  color: var(--ink);
  border-color: var(--border);
}

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

.btn--on-dark {
  background: transparent;
  color: var(--navy-ink);
  border-color: var(--navy-border);
}

.btn--on-dark:hover {
  border-color: rgba(255, 255, 255, 0.35);
  background: rgba(255, 255, 255, 0.06);
}

.btn--whatsapp {
  background: var(--whatsapp);
  color: #fff;
}

.btn--whatsapp:hover {
  filter: brightness(1.05);
}

.btn--ghost-icon {
  background: var(--surface-muted);
  color: var(--ink);
  padding: 0.75em;
  border-radius: var(--radius-pill);
}

.btn--ghost-icon:hover {
  background: var(--border);
}

.btn--sm {
  padding: 0.6em 1.1em;
  font-size: var(--fs-small);
}

.btn--block {
  width: 100%;
}

/* ============ Badge / Pill ============ */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  padding: 0.35em 0.9em;
  border-radius: var(--radius-pill);
  font-size: var(--fs-small);
  font-weight: 600;
  background: var(--surface-muted);
  color: var(--ink-soft);
  border: 1px solid var(--border);
}

.badge--eng {
  background: var(--track-eng-soft);
  color: var(--track-eng);
  border-color: transparent;
}

.badge--arts {
  background: var(--track-arts-soft);
  color: var(--track-arts);
  border-color: transparent;
}

.badge--mono {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

/* ============ Card ============ */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-3);
  transition: transform var(--duration-base) var(--ease-out-expo),
    box-shadow var(--duration-base) var(--ease-out-expo),
    border-color var(--duration-base) var(--ease-out-expo);
}

.card:hover {
  transform: translateY(-4px) scale(1.01);
  box-shadow: var(--shadow-md);
}

/* Course card */
.card--course {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.card--course[data-track="engineering"]:hover {
  border-color: var(--track-eng);
}

.card--course[data-track="arts"]:hover {
  border-color: var(--track-arts);
}

.card--course__code {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--ink-soft);
  letter-spacing: 0.04em;
}

.card--course__name {
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: var(--lh-snug);
}

/* Pillar tile */
.pillar-tile {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
}

.pillar-tile__icon {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-md);
  background: var(--accent-soft);
  color: var(--accent);
}

.pillar-tile__icon svg {
  width: 24px;
  height: 24px;
}

.pillar-tile__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  margin-top: var(--space-1);
}

.pillar-tile__list li {
  display: flex;
  align-items: flex-start;
  gap: 0.6em;
  font-size: var(--fs-small);
  color: var(--ink-soft);
}

.pillar-tile__list svg {
  width: 16px;
  height: 16px;
  color: var(--success);
  margin-top: 0.15em;
  flex-shrink: 0;
}

/* Contact card */
.contact-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.contact-card__row {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--fs-small);
}

.contact-card__row svg {
  width: 18px;
  height: 18px;
  color: var(--accent);
  flex-shrink: 0;
}

.contact-card__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: auto;
}

/* ============ Trust badge strip ============ */
.trust-strip {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  justify-content: center;
}

/* ============ College switcher ============ */
.switcher {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
}

.switcher-panel {
  position: relative;
  text-align: left;
  cursor: pointer;
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  transition: border-color var(--duration-base) var(--ease-out-expo),
    transform var(--duration-base) var(--ease-out-expo),
    box-shadow var(--duration-base) var(--ease-out-expo);
}

.switcher-panel:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.switcher-panel[data-active="true"][data-track="engineering"] {
  border-color: var(--track-eng);
  box-shadow: var(--shadow-md);
}

.switcher-panel[data-active="true"][data-track="arts"] {
  border-color: var(--track-arts);
  box-shadow: var(--shadow-md);
}

.switcher-panel__icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  display: grid;
  place-items: center;
}

.switcher-panel[data-track="engineering"] .switcher-panel__icon {
  background: var(--track-eng-soft);
  color: var(--track-eng);
}

.switcher-panel[data-track="arts"] .switcher-panel__icon {
  background: var(--track-arts-soft);
  color: var(--track-arts);
}

.switcher-panel__icon svg {
  width: 26px;
  height: 26px;
}

.switcher-panel__cta {
  margin-top: var(--space-2);
  font-weight: 600;
  font-size: var(--fs-small);
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
}

.switcher-panel[data-track="engineering"] .switcher-panel__cta {
  color: var(--track-eng);
}

.switcher-panel[data-track="arts"] .switcher-panel__cta {
  color: var(--track-arts);
}

/* ============ Program tabs (UG/PG/PhD) ============ */
.program-tabs {
  display: flex;
  gap: var(--space-1);
  padding: 4px;
  background: var(--surface-muted);
  border-radius: var(--radius-pill);
  width: fit-content;
  margin-inline: auto;
}

.program-tabs__btn {
  border: none;
  background: transparent;
  padding: 0.6em 1.25em;
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: var(--fs-small);
  color: var(--ink-soft);
  cursor: pointer;
  transition: background var(--duration-fast) var(--ease-out-expo),
    color var(--duration-fast) var(--ease-out-expo);
}

.program-tabs__btn[aria-selected="true"] {
  background: var(--surface);
  color: var(--ink);
  box-shadow: var(--shadow-sm);
}

.program-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
}

/* ============ Stepper (Admission Process) ============ */
.stepper {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  position: relative;
}

.stepper__item {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  position: relative;
}

.stepper__number {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--navy-900);
  color: #fff;
  font-family: var(--font-mono);
  font-weight: 600;
}

.stepper__item:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 22px;
  left: calc(44px + var(--space-2));
  right: calc(-1 * var(--space-4) + var(--space-2));
  height: 1px;
  background: var(--border);
}

/* ============ Accordion (FAQ) ============ */
.accordion-item {
  border-bottom: 1px solid var(--border);
}

.accordion-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding: var(--space-3) 0;
  background: none;
  border: none;
  text-align: left;
  font-weight: 600;
  font-size: 1.0625rem;
  cursor: pointer;
  color: var(--ink);
}

.accordion-trigger svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  transition: transform var(--duration-base) var(--ease-out-expo);
}

.accordion-trigger[aria-expanded="true"] svg {
  transform: rotate(180deg);
}

.accordion-panel {
  overflow: hidden;
  max-height: 0;
  transition: max-height var(--duration-base) var(--ease-out-expo);
}

.accordion-panel__inner {
  padding-bottom: var(--space-3);
  color: var(--ink-soft);
}

/* ============ Form ============ */
.form-field {
  display: flex;
  flex-direction: column;
  gap: 0.4em;
  margin-bottom: var(--space-3);
}

.form-field label {
  font-size: var(--fs-small);
  font-weight: 600;
}

.form-field input,
.form-field select,
.form-field textarea {
  padding: 0.85em 1em;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--ink);
  transition: border-color var(--duration-fast) var(--ease-out-expo),
    box-shadow var(--duration-fast) var(--ease-out-expo);
}

.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: var(--shadow-focus);
}

.form-field textarea {
  resize: vertical;
  min-height: 96px;
}

.form-field select:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.form-field__error {
  font-size: var(--fs-small);
  color: #dc2626;
  min-height: 1.2em;
}

.radio-chip-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.radio-chip {
  position: relative;
}

.radio-chip input {
  position: absolute;
  opacity: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  cursor: pointer;
}

.radio-chip span {
  display: inline-flex;
  padding: 0.6em 1.1em;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  font-size: var(--fs-small);
  font-weight: 600;
  color: var(--ink-soft);
  transition: all var(--duration-fast) var(--ease-out-expo);
}

.radio-chip input:checked + span {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.radio-chip input:focus-visible + span {
  box-shadow: var(--shadow-focus);
}

.form-status {
  margin-top: var(--space-2);
  font-size: var(--fs-small);
  font-weight: 600;
}

.form-status[data-state="success"] {
  color: var(--success);
}

.form-status[data-state="error"] {
  color: #dc2626;
}

/* ============ Sticky nav ============ */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  padding-block: var(--space-3);
  transition: padding var(--duration-base) var(--ease-out-expo),
    background var(--duration-base) var(--ease-out-expo),
    box-shadow var(--duration-base) var(--ease-out-expo),
    backdrop-filter var(--duration-base) var(--ease-out-expo);
  background: transparent;
}

.site-nav.is-scrolled {
  padding-block: var(--space-1);
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
}

.site-nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.site-nav__brand {
  font-weight: 700;
  font-size: 1.05rem;
}

.site-nav__links {
  display: flex;
  gap: var(--space-4);
  font-size: var(--fs-small);
  font-weight: 600;
  color: var(--ink-soft);
}

.site-nav__links a {
  position: relative;
  padding-block: 0.2em;
}

.site-nav__links a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: -2px;
  height: 2px;
  background: var(--accent);
  transition: right var(--duration-base) var(--ease-out-expo);
}

.site-nav__links a.is-active {
  color: var(--ink);
}

.site-nav__links a.is-active::after {
  right: 0;
}

/* ============ Sticky mobile CTA bar ============ */
.sticky-cta-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 90;
  display: none;
  gap: var(--space-2);
  padding: var(--space-2) var(--gutter);
  padding-bottom: max(var(--space-2), env(safe-area-inset-bottom));
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  backdrop-filter: blur(12px);
  border-top: 1px solid var(--border);
}

@media (max-width: 767px) {
  .sticky-cta-bar {
    display: flex;
  }
  body {
    padding-bottom: 76px;
  }
}

.sticky-cta-bar .btn {
  flex: 1;
  padding-inline: 0.75em;
}