/* ════════════════════════════════════════════════════
   COMPONENTS — Cursor · Nav · Buttons · Cards
   css/components.css
   ════════════════════════════════════════════════════ */

/* ── Custom Cursor ── */
.cursor {
  position: fixed;
  width: 8px;
  height: 8px;
  background: var(--color-gold);
  border-radius: 50%;
  pointer-events: none;
  z-index: 10000;
  transform: translate(-50%, -50%);
  transition: transform 0.15s ease, background 0.2s, width 0.2s, height 0.2s;
  mix-blend-mode: difference;
}

.cursor-ring {
  position: fixed;
  width: 36px;
  height: 36px;
  border: 1px solid rgba(201, 168, 76, 0.5);
  border-radius: 50%;
  pointer-events: none;
  z-index: 9999;
  transform: translate(-50%, -50%);
  transition: width 0.2s ease, height 0.2s ease, border-color 0.2s ease;
}

.cursor.is-hovering {
  transform: translate(-50%, -50%) scale(2);
}

.cursor-ring.is-hovering {
  width: 60px;
  height: 60px;
  border-color: var(--color-gold);
}

@media (hover: none) and (pointer: coarse) {
  .cursor, .cursor-ring { display: none; }
}

/* ── Loader ── */
.loader {
  position: fixed;
  inset: 0;
  background: var(--color-ink);
  z-index: 99999;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.6s ease, visibility 0.6s ease;
}

.loader.is-hidden {
  opacity: 0;
  visibility: hidden;
}

.loader-content {
  text-align: center;
}

.loader-letter {
  font-family: var(--font-display);
  font-size: 6rem;
  font-weight: 400;
  font-style: italic;
  color: var(--color-gold);
  margin-bottom: 1rem;
  animation: loader-pulse 1.4s infinite ease-in-out;
}

@keyframes loader-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(0.95); }
}

.loader-bar {
  width: 200px;
  height: 1px;
  background: rgba(201, 168, 76, 0.2);
  margin: 0 auto 1rem;
  overflow: hidden;
}

.loader-bar-fill {
  height: 100%;
  background: var(--color-gold);
  width: 0;
  animation: loader-fill 1.6s ease-out forwards;
}

@keyframes loader-fill {
  to { width: 100%; }
}

.loader-text {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.3em;
  color: rgba(245, 242, 237, 0.5);
}

/* ── Scroll Progress ── */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-gold), var(--color-rust));
  width: 0;
  z-index: 9998;
  transition: width 0.1s linear;
}

/* ── Navbar ── */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 500;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-2xl);
  background: var(--surface-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition-base), border-color var(--transition-base);
}

.navbar.is-scrolled {
  background: rgba(10, 10, 10, 0.95);
  border-bottom-color: rgba(201, 168, 76, 0.25);
}

.navbar__logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  font-style: italic;
  color: var(--color-paper);
  letter-spacing: 0.5px;
  transition: color var(--transition-base);
}

.navbar__logo:hover {
  color: var(--color-gold);
}

.navbar__logo-dot {
  color: var(--color-gold);
  font-style: normal;
}

.navbar__menu {
  display: flex;
  gap: var(--space-xl);
  align-items: center;
}

.navbar__link {
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: rgba(245, 242, 237, 0.65);
  transition: color var(--transition-ease);
  position: relative;
  padding: 4px 0;
}

.navbar__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-gold);
  transition: width 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.navbar__link:hover {
  color: var(--color-paper);
}

.navbar__link:hover::after,
.navbar__link.is-active::after {
  width: 100%;
}

.navbar__cta {
  background: var(--color-gold);
  color: var(--color-ink);
  padding: 0.55rem 1.4rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  transition: all var(--transition-ease);
}

.navbar__cta:hover {
  background: var(--color-gold-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-gold);
}

/* Students nav link — distinct styling */
.navbar__link--students {
  position: relative;
  color: var(--color-gold) !important;
}

.navbar__link--students::before {
  content: '★';
  margin-right: 6px;
  font-size: 0.8em;
  color: var(--color-gold);
}

.navbar__link--students:hover {
  color: var(--color-gold-light) !important;
}

.navbar__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}

.navbar__hamburger span {
  width: 24px;
  height: 1.5px;
  background: var(--color-paper);
  transition: all var(--transition-base);
}

.navbar__hamburger.is-open span:nth-child(1) {
  transform: rotate(45deg) translate(4px, 5px);
}
.navbar__hamburger.is-open span:nth-child(2) {
  opacity: 0;
}
.navbar__hamburger.is-open span:nth-child(3) {
  transform: rotate(-45deg) translate(4px, -5px);
}

/* ── Mobile Nav ── */
.mobile-nav {
  position: fixed;
  inset: 0;
  background: var(--color-ink);
  z-index: 600;
  display: flex;
  flex-direction: column;
  padding: 5rem 2rem 2rem;
  opacity: 0;
  visibility: hidden;
  transform: translateX(20px);
  transition: opacity var(--transition-base), visibility var(--transition-base), transform var(--transition-base);
}

.mobile-nav.is-open {
  opacity: 1;
  visibility: visible;
  transform: translateX(0);
}

.mobile-nav__close {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  font-size: 1.5rem;
  color: var(--color-paper);
  width: 44px;
  height: 44px;
}

.mobile-nav nav {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-top: 2rem;
}

.mobile-nav__link {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 300;
  color: var(--color-paper);
  letter-spacing: -0.02em;
  transition: color var(--transition-ease), transform var(--transition-ease);
  display: inline-block;
}

.mobile-nav__link:hover,
.mobile-nav__link:active {
  color: var(--color-gold);
  transform: translateX(8px);
}

.mobile-nav__footer {
  margin-top: auto;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-muted);
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.95rem 2rem;
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
  transition: all var(--transition-ease);
  cursor: none;
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-gold);
  color: var(--color-ink);
}

.btn--primary:hover {
  background: var(--color-gold-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-gold);
}

.btn--ghost {
  background: transparent;
  color: var(--color-paper);
  border-color: rgba(245, 242, 237, 0.25);
}

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

.btn--rust {
  background: var(--color-rust);
  color: var(--color-paper);
}

.btn--rust:hover {
  background: var(--color-rust-dark);
  box-shadow: 0 12px 40px rgba(184, 74, 46, 0.3);
}

.btn__arrow {
  display: inline-block;
  transition: transform var(--transition-ease);
}

.btn:hover .btn__arrow {
  transform: translateX(4px);
}

/* ── Skill Tag ── */
.skill-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  color: rgba(245, 242, 237, 0.65);
  border: 1px solid var(--color-border);
  padding: 0.55rem 0.9rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-ease);
}

.skill-tag:hover {
  border-color: var(--color-gold);
  color: var(--color-gold);
  background: rgba(201, 168, 76, 0.05);
}

/* ── Highlight Card ── */
.highlight {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.75rem 1.5rem;
  background: var(--surface-card);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.highlight::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-gold);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.highlight:hover {
  background: var(--surface-card-hover);
  transform: translateX(6px);
  border-color: rgba(201, 168, 76, 0.35);
}

.highlight:hover::before {
  transform: scaleY(1);
}

.highlight__num {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 500;
  font-style: italic;
  color: rgba(201, 168, 76, 0.25);
  line-height: 1;
  margin-bottom: 0.75rem;
}

.highlight__title {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 0.5rem;
  color: var(--color-paper);
  letter-spacing: -0.005em;
  line-height: 1.3;
}

.highlight__desc {
  font-size: 0.85rem;
  color: rgba(245, 242, 237, 0.6);
  line-height: 1.65;
}

/* ── Research Card ── */
.research-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 2rem 1.75rem;
  background: var(--surface-card);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.research-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-gold), transparent);
  transform: translateX(-100%);
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.research-card:hover::after {
  transform: translateX(100%);
}

.research-card:hover {
  border-color: rgba(201, 168, 76, 0.4);
  background: var(--surface-card-hover);
  transform: translateY(-6px);
  box-shadow: var(--shadow-card);
}

.research-card__icon {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 400;
  color: var(--color-gold);
  margin-bottom: 1.25rem;
  line-height: 1;
}

.research-card__title {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: -0.005em;
  margin-bottom: 0.625rem;
  color: var(--color-paper);
  line-height: 1.35;
}

.research-card__desc {
  font-size: 0.85rem;
  color: rgba(245, 242, 237, 0.55);
  line-height: 1.7;
}

/* ── Math Card ── */
.math-card {
  background: rgba(10, 10, 10, 0.5);
  border: 1px solid rgba(201, 168, 76, 0.15);
  border-radius: var(--radius-md);
  padding: 1.75rem 1.5rem;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.math-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--color-gold), transparent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.math-card:hover::after {
  transform: scaleX(1);
}

.math-card:hover {
  border-color: rgba(201, 168, 76, 0.4);
  transform: translateY(-4px);
  background: rgba(201, 168, 76, 0.03);
}

.math-card__num {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 300;
  font-style: italic;
  color: rgba(201, 168, 76, 0.18);
  line-height: 1;
  margin-bottom: 0.75rem;
}

.math-card__title {
  font-family: var(--font-body);
  font-weight: 800;
  font-size: 0.95rem;
  letter-spacing: -0.005em;
  margin-bottom: 0.625rem;
  color: var(--color-paper);
}

.math-card__desc {
  font-size: 0.82rem;
  color: rgba(245, 242, 237, 0.5);
  line-height: 1.7;
  margin-bottom: 0.875rem;
}

.math-card__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-gold);
  border: 1px solid rgba(201, 168, 76, 0.3);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
}

/* ── Mentor Card ── */
.mentor-card {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding: 1.25rem 1.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--surface-card);
  transition: all var(--transition-ease);
}

.mentor-card:hover {
  background: var(--surface-card-hover);
  border-color: rgba(201, 168, 76, 0.35);
  transform: translateX(8px);
}

.mentor-card__icon {
  font-size: 1.5rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.mentor-card__title {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 0.375rem;
  letter-spacing: -0.005em;
}

.mentor-card__desc {
  font-size: 0.82rem;
  color: rgba(245, 242, 237, 0.55);
  line-height: 1.65;
}

/* ── Feature ── */
.feature {
  display: flex;
  gap: 0.875rem;
  align-items: center;
  padding: 1rem 1.25rem;
  background: rgba(10, 10, 10, 0.04);
  border: 1px solid rgba(10, 10, 10, 0.08);
  border-radius: var(--radius-md);
  transition: all var(--transition-ease);
}

.feature:hover {
  border-color: var(--color-rust);
  background: rgba(184, 74, 46, 0.03);
}

.feature__icon {
  font-size: 1.4rem;
  flex-shrink: 0;
}

.feature__label {
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: -0.005em;
}

.feature__desc {
  font-size: 0.74rem;
  color: rgba(10, 10, 10, 0.55);
  margin-top: 0.125rem;
}