/* ── Reset & Base ── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-bg: #000000;
  --color-bg-elevated: #0a0a0a;
  --color-bg-card: #111111;
  --color-surface: #1a1a1a;
  --color-border: rgba(255, 255, 255, 0.1);
  --color-border-hover: rgba(255, 255, 255, 0.2);
  --color-text: #ffffff;
  --color-text-muted: #9a9a9a;
  --color-accent: #ffffff;
  --color-accent-muted: #d4d4d4;
  --color-accent-warm: #c8c8c8;
  --color-accent-glow: rgba(255, 255, 255, 0.08);
  --color-header-bg: rgba(0, 0, 0, 0.9);
  --color-hero-glow-1: rgba(255, 255, 255, 0.04);
  --color-hero-glow-2: rgba(255, 255, 255, 0.03);
  --color-btn-text: #000000;
  --font-sans: 'DM Sans', system-ui, sans-serif;
  --font-serif: 'Roboto Slab', Georgia, serif;
  --radius: 12px;
  --radius-lg: 20px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
  --color-bg: #f7f7f7;
  --color-bg-elevated: #ffffff;
  --color-bg-card: #ffffff;
  --color-surface: #ececec;
  --color-border: rgba(0, 0, 0, 0.1);
  --color-border-hover: rgba(0, 0, 0, 0.18);
  --color-text: #111111;
  --color-text-muted: #5c5c5c;
  --color-accent: #000000;
  --color-accent-muted: #333333;
  --color-accent-warm: #666666;
  --color-accent-glow: rgba(0, 0, 0, 0.05);
  --color-header-bg: rgba(255, 255, 255, 0.92);
  --color-hero-glow-1: rgba(0, 0, 0, 0.04);
  --color-hero-glow-2: rgba(0, 0, 0, 0.03);
  --color-btn-text: #ffffff;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background var(--transition), color var(--transition);
}

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

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

/* ── Header ── */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--color-header-bg);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition), border-color var(--transition);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.logo {
  display: flex;
  align-items: center;
}

.logo-img {
  height: 72px;
  width: auto;
  display: block;
  transition: filter var(--transition);
}

[data-theme="light"] .logo-img {
  filter: invert(1);
}

.footer-brand .logo-img {
  height: 64px;
}

.theme-toggle {
  display: flex;
  align-items: center;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.theme-toggle-track {
  position: relative;
  width: 56px;
  height: 30px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  transition: background var(--transition), border-color var(--transition);
}

.theme-toggle-icons {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 7px;
  pointer-events: none;
}

.theme-icon {
  width: 14px;
  height: 14px;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

.theme-toggle-thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 22px;
  height: 22px;
  background: var(--color-accent);
  border-radius: 50%;
  transition: transform var(--transition), background var(--transition);
}

[data-theme="light"] .theme-toggle-thumb {
  transform: translateX(26px);
}

[data-theme="dark"] .theme-icon-moon,
[data-theme="light"] .theme-icon-sun {
  color: var(--color-text);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-linkedin {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}

.nav-linkedin:hover {
  color: var(--color-text);
  border-color: var(--color-border-hover);
  background: var(--color-accent-glow);
}

.linkedin-icon {
  width: 18px;
  height: 18px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

.nav-links a:hover {
  color: var(--color-text);
}

.nav-cta {
  padding: 8px 18px;
  background: var(--color-accent);
  color: var(--color-btn-text) !important;
  border-radius: 8px;
  font-weight: 600;
}

.nav-cta:hover {
  background: var(--color-accent-muted);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  transition: var(--transition);
}

/* ── Stats Bar ── */
.stats-bar {
  width: 100%;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding-top: 80px;
  transition: background var(--transition), border-color var(--transition);
}

.stats-bar-inner {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  width: 100%;
}

.stats-bar-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 24px;
  border-right: 1px solid var(--color-border);
}

.stats-bar-item:last-child {
  border-right: none;
}

.stats-bar-number {
  font-family: var(--font-serif);
  font-size: clamp(3.5rem, 10vw, 5.5rem);
  font-weight: 600;
  line-height: 1;
  margin-bottom: 12px;
}

.stats-bar-label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-align: center;
}

/* ── Hero ── */
.hero {
  position: relative;
  min-height: auto;
  display: flex;
  align-items: center;
  padding: 80px 0 100px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 70% 20%, var(--color-hero-glow-1), transparent),
    radial-gradient(ellipse 40% 40% at 20% 80%, var(--color-hero-glow-2), transparent);
  pointer-events: none;
}

.hero-content {
  position: relative;
}

.hero-label {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-accent);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(2.8rem, 6vw, 4.5rem);
  font-weight: 400;
  line-height: 1.1;
  margin-bottom: 24px;
}

.hero h1 em {
  font-style: italic;
  color: var(--color-accent-muted);
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  max-width: 560px;
  margin-bottom: 36px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  padding: 14px 28px;
  border-radius: 10px;
  font-weight: 500;
  font-size: 0.95rem;
  transition: all var(--transition);
  border: none;
  cursor: pointer;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-btn-text);
  font-weight: 600;
}

.btn-primary:hover {
  background: var(--color-accent-muted);
  transform: translateY(-1px);
}

.btn-secondary {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

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

/* ── Sections ── */
.section {
  padding: 100px 0;
}

.section-header {
  margin-bottom: 56px;
}

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.section-header h2 {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 400;
  line-height: 1.2;
}

.section-intro {
  margin-top: 16px;
  max-width: 560px;
  color: var(--color-text-muted);
  font-size: 1.05rem;
}

/* ── About ── */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.about-text p {
  color: var(--color-text-muted);
  margin-bottom: 20px;
  font-size: 1.05rem;
}

.about-text strong {
  color: var(--color-text);
}

.about-cards {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.about-card {
  padding: 24px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: border-color var(--transition);
}

.about-card:hover {
  border-color: var(--color-border-hover);
}

.about-card-icon {
  color: var(--color-accent);
  font-size: 0.75rem;
  margin-bottom: 12px;
}

.about-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.about-card p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* ── Program ── */
.program {
  background: var(--color-bg-elevated);
}

.program-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.step {
  padding: 32px 24px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: transform var(--transition), border-color var(--transition);
}

.step:hover {
  transform: translateY(-4px);
  border-color: var(--color-border-hover);
}

.step-num {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 20px;
}

.step h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.step p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* ── Competition ── */
.competition-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.competition-content h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 400;
  line-height: 1.2;
  margin-bottom: 20px;
}

.competition-content p {
  color: var(--color-text-muted);
  font-size: 1.05rem;
  margin-bottom: 28px;
}

.competition-list {
  list-style: none;
}

.competition-list li {
  position: relative;
  padding-left: 28px;
  margin-bottom: 14px;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.competition-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 8px;
  background: var(--color-accent);
  border-radius: 50%;
}

.competition-visual {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.visual-card {
  padding: 32px;
  background: linear-gradient(135deg, var(--color-bg-card), var(--color-surface));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.visual-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-accent-warm);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.visual-card p {
  font-size: 1rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ── Team ── */
.team {
  background: var(--color-bg-elevated);
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.team-card {
  text-align: center;
  padding: 40px 24px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: transform var(--transition), border-color var(--transition);
}

.team-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-border-hover);
}

.team-avatar {
  width: 96px;
  height: 96px;
  margin: 0 auto 20px;
  border-radius: 50%;
  overflow: hidden;
  border: 2px solid var(--color-border);
  background: var(--color-bg-card);
}

.team-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  display: block;
}

.team-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.team-role {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.team-links {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
}

.team-linkedin {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

.team-linkedin:hover {
  color: var(--color-text);
}

.team-email {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-text-muted);
  word-break: break-all;
  transition: color var(--transition);
}

.team-email:hover {
  color: var(--color-text);
}

/* ── Contact ── */
.contact-inner {
  text-align: center;
}

.contact-text {
  max-width: 600px;
  margin: 0 auto 48px;
}

.contact-text h2 {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 400;
  margin-bottom: 16px;
}

.contact-text p {
  color: var(--color-text-muted);
  font-size: 1.05rem;
}

.contact-options {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.contact-option {
  padding: 32px 24px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition);
}

.contact-option:hover {
  border-color: var(--color-border-hover);
}

.contact-option h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.contact-option p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.contact-form {
  max-width: 640px;
  margin: 56px auto 0;
  padding: 40px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-align: left;
}

.contact-form-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 24px;
  text-align: center;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 20px;
}

.form-field label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-muted);
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 12px 14px;
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--color-text);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: border-color var(--transition), background var(--transition);
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
  color: var(--color-text-muted);
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--color-border-hover);
  background: var(--color-surface);
}

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

.contact-form .btn-primary {
  width: 100%;
  margin-top: 8px;
  cursor: pointer;
}

/* ── Footer ── */
.footer {
  padding: 48px 0;
  border-top: 1px solid var(--color-border);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-brand p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-top: 8px;
}

.footer-copy {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* ── Responsive ── */
@media (max-width: 960px) {
  .about-grid,
  .competition-inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .program-steps {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .contact-options {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .nav-toggle {
    display: flex;
  }

  .form-row {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .contact-form {
    padding: 28px 20px;
  }

  .nav-right {
    gap: 12px;
  }

  .nav-links {
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    background: var(--color-bg-elevated);
    flex-direction: column;
    padding: 24px;
    gap: 20px;
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition);
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .stats-bar-inner {
    grid-template-columns: 1fr;
  }

  .stats-bar-item {
    border-right: none;
    border-bottom: 1px solid var(--color-border);
    padding: 32px 24px;
  }

  .stats-bar-item:last-child {
    border-bottom: none;
  }

  .program-steps {
    grid-template-columns: 1fr;
  }

  .team-grid {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    flex-direction: column;
    gap: 24px;
    text-align: center;
  }
}