/* ============================================
   ACS Student Chapter at NCCU: Styles
   A clean, modern design with NCCU maroon
   and ACS-inspired chemistry aesthetics.
   ============================================ */

/* ---------- Custom Properties ---------- */
:root {
  --maroon: #810000;
  --maroon-dark: #5c0000;
  --maroon-light: #a33;
  --gold: #c7a84e;
  --navy: #1a1a2e;
  --white: #ffffff;
  --off-white: #f8f7f4;
  --gray-50: #fafaf9;
  --gray-100: #f3f2ef;
  --gray-200: #e5e3de;
  --gray-400: #9e9b93;
  --gray-600: #5e5c57;
  --gray-800: #2d2b28;
  --text: #2d2b28;
  --text-light: #5e5c57;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow: 0 4px 20px rgba(0,0,0,.08);
  --shadow-lg: 0 12px 40px rgba(0,0,0,.12);
  --transition: 0.3s cubic-bezier(.4,0,.2,1);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-serif: 'Playfair Display', Georgia, serif;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--maroon); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--maroon-dark); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

/* ---------- Container ---------- */
.container {
  width: 100%;
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Navbar ---------- */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: var(--transition);
}
.navbar.scrolled {
  border-bottom-color: var(--gray-200);
  box-shadow: var(--shadow-sm);
}
.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-size: 1rem;
}
.nav-logo:hover { color: var(--maroon); }
.logo-img {
  width: 36px;
  height: 36px;
  object-fit: contain;
}
.logo-text { display: flex; flex-direction: column; line-height: 1.2; }
.logo-text strong { font-weight: 700; }
.logo-text small { font-size: .7rem; color: var(--gray-600); letter-spacing: .05em; text-transform: uppercase; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-links a {
  color: var(--gray-600);
  font-size: .9rem;
  font-weight: 500;
  letter-spacing: .01em;
  position: relative;
  padding: 4px 0;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 0; height: 2px;
  background: var(--maroon);
  transition: width var(--transition);
}
.nav-links a:hover,
.nav-links a.active { color: var(--maroon); }
.nav-links a:hover::after,
.nav-links a.active::after { width: 100%; }

/* Mobile Toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 24px; height: 2px;
  background: var(--text);
  transition: var(--transition);
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
  padding: 120px 24px 80px;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(129,0,0,.06) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 20%, rgba(199,168,78,.06) 0%, transparent 60%),
    linear-gradient(180deg, var(--off-white) 0%, var(--white) 100%);
}
.hero-content { position: relative; max-width: 720px; }
.hero-logo {
  width: 160px;
  height: auto;
  margin: 0 auto 28px;
  display: block;
  filter: drop-shadow(0 4px 12px rgba(0,0,0,.1));
}
.hero-badge {
  display: inline-block;
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--maroon);
  background: rgba(129,0,0,.07);
  padding: 8px 20px;
  border-radius: 100px;
  margin-bottom: 28px;
}
.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2.8rem, 6vw, 4.5rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--navy);
  margin-bottom: 24px;
}
.hero-accent { color: var(--maroon); }
.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-light);
  max-width: 560px;
  margin: 0 auto 40px;
  line-height: 1.8;
}
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

.hero-scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  color: var(--gray-400);
  animation: bounce 2s infinite;
}
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: .95rem;
  font-weight: 600;
  border-radius: 100px;
  border: 2px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
}
.btn-primary {
  background: var(--maroon);
  color: var(--white);
  border-color: var(--maroon);
}
.btn-primary:hover {
  background: var(--maroon-dark);
  border-color: var(--maroon-dark);
  color: var(--white);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.btn-outline {
  background: transparent;
  color: var(--maroon);
  border-color: var(--maroon);
}
.btn-outline:hover {
  background: var(--maroon);
  color: var(--white);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.btn-lg { padding: 18px 40px; font-size: 1.05rem; }
.btn-block { width: 100%; justify-content: center; }

/* ---------- Sections ---------- */
.section { padding: 100px 0; }
.section-alt { background: var(--gray-50); }
.section-header {
  text-align: center;
  margin-bottom: 60px;
}
.section-header-left { text-align: left; }
.section-label {
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--maroon);
  margin-bottom: 12px;
}
.section-header h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 700;
  color: var(--navy);
}

/* ---------- Page Header ---------- */
.page-header {
  padding: 140px 0 60px;
  background: var(--gray-50);
  text-align: center;
}
.page-header h1 {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 12px;
}
.page-subtitle {
  font-size: 1.1rem;
  color: var(--text-light);
  max-width: 540px;
  margin: 0 auto;
}

/* ---------- Page Content (Markdown) ---------- */
.page-content {
  padding: 80px 0;
}
.page-content h2 {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  color: var(--navy);
  margin: 48px 0 16px;
}
.page-content h2:first-child { margin-top: 0; }
.page-content p { margin-bottom: 16px; color: var(--text-light); }
.page-content strong { color: var(--text); }
.page-content ul, .page-content ol {
  margin: 16px 0;
  padding-left: 24px;
}
.page-content li {
  list-style: disc;
  margin-bottom: 8px;
  color: var(--text-light);
}
.page-content hr {
  border: none;
  height: 1px;
  background: var(--gray-200);
  margin: 48px 0;
}
.page-content em { color: var(--gray-600); }
.page-content a { color: var(--maroon); font-weight: 500; border-bottom: 1px solid rgba(129,0,0,.2); }
.page-content a:hover { border-bottom-color: var(--maroon); }

/* ---------- Mission Grid ---------- */
.mission-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 32px;
}
.mission-card {
  padding: 40px 32px;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  text-align: center;
  transition: var(--transition);
}
.mission-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: transparent;
}
.mission-icon {
  width: 64px; height: 64px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(129,0,0,.06);
  color: var(--maroon);
  border-radius: 50%;
  font-size: 1.4rem;
}
.mission-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--navy);
}
.mission-card p {
  font-size: .92rem;
  color: var(--text-light);
  line-height: 1.65;
}

/* ---------- Highlights ---------- */
.highlights-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 32px;
  text-align: center;
}
.highlight-item {
  padding: 40px 24px;
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}
.highlight-number {
  display: block;
  font-family: var(--font-serif);
  font-size: 3rem;
  font-weight: 700;
  color: var(--maroon);
  line-height: 1;
  margin-bottom: 8px;
}
.highlight-label {
  font-size: .9rem;
  color: var(--text-light);
  font-weight: 500;
}

/* ---------- CTA ---------- */
.cta-section {
  background: var(--navy);
  text-align: center;
}
.cta-content h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  color: var(--white);
  margin-bottom: 16px;
}
.cta-content p {
  color: rgba(255,255,255,.7);
  max-width: 500px;
  margin: 0 auto 32px;
  font-size: 1.05rem;
}

/* ---------- Events ---------- */
.events-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.event-card {
  display: flex;
  gap: 28px;
  padding: 32px;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  transition: var(--transition);
}
.event-card:hover {
  box-shadow: var(--shadow);
  border-color: transparent;
}
.event-date {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-width: 70px;
  padding: 12px;
  background: rgba(129,0,0,.06);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}
.event-month {
  font-size: .75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--maroon);
}
.event-day {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--maroon);
  line-height: 1;
}
.event-info h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 6px;
}
.event-meta {
  font-size: .85rem;
  color: var(--gray-400);
  margin-bottom: 10px;
}
.event-meta i { margin-right: 4px; color: var(--maroon); font-size: .75rem; }
.event-info p:last-child { font-size: .92rem; color: var(--text-light); }

.events-note {
  max-width: 800px;
  margin: 40px auto 0;
  padding: 20px 24px;
  background: rgba(129,0,0,.04);
  border-radius: var(--radius-sm);
  font-size: .9rem;
  color: var(--text-light);
}
.events-empty {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
  color: var(--text-light);
  line-height: 1.7;
}
.event-info { flex: 1; }
.event-card[hidden] { display: none; }
.event-rsvp { margin-top: 16px; }
.event-flyer {
  flex-shrink: 0;
  width: 150px;
  align-self: flex-start;
}
.event-flyer img,
.past-event-flyer img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  transition: var(--transition);
}
.event-flyer:hover img,
.past-event-flyer:hover img { transform: translateY(-3px); }

/* Past events: a gallery of flyers with a short write-up under each */
.past-events-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 32px;
}
.past-event-card {
  display: flex;
  flex-direction: column;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  overflow: hidden;
}
.past-event-flyer {
  display: block;
  padding: 24px 24px 0;
}
.past-event-info { padding: 20px 24px 28px; }
.past-event-info h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 6px;
}
.past-event-info p:last-child { font-size: .92rem; color: var(--text-light); line-height: 1.6; }

/* ---------- News ---------- */
.news-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.news-card {
  padding: 32px;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
}
.news-image {
  width: 100%;
  max-height: 360px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
}
.news-date {
  font-size: .8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--maroon);
  margin-bottom: 6px;
}
.news-date i { margin-right: 4px; }
.news-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 10px;
}
.news-text {
  font-size: .95rem;
  color: var(--text-light);
  line-height: 1.7;
}
.news-card .btn { margin-top: 20px; }

.events-note i { color: var(--maroon); margin-right: 8px; }

/* ---------- Meeting Info ---------- */
.meeting-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
  max-width: 700px;
  margin: 0 auto;
}
.meeting-card {
  text-align: center;
  padding: 40px 32px;
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}
.meeting-card i {
  font-size: 2rem;
  color: var(--maroon);
  margin-bottom: 16px;
}
.meeting-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 10px;
}
.meeting-card p {
  font-size: .92rem;
  color: var(--text-light);
  margin-bottom: 4px;
}

/* ---------- Officers ---------- */
/* Top two cards share a row; the rest go three per row, and a
   short last row is centered instead of left-aligned. */
.officers-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 32px;
}
.officer-card--top {
  flex: 0 1 calc((100% - 32px) / 2);
}
.officer-card:not(.officer-card--top) {
  flex: 0 1 calc((100% - 64px) / 3);
}
.officer-card {
  text-align: center;
  padding: 40px 28px;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  transition: var(--transition);
}
.officer-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: transparent;
}
.officer-avatar {
  width: 96px; height: 96px;
  margin: 0 auto 20px;
  border-radius: 50%;
  overflow: hidden;
}
.officer-avatar img {
  width: 100%; height: 100%;
  object-fit: cover;
}
.avatar-placeholder {
  width: 100%; height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(129,0,0,.08);
  color: var(--maroon);
  font-size: 2rem;
}
.officer-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 4px;
}
.officer-role {
  font-size: .85rem;
  font-weight: 600;
  color: var(--maroon);
  text-transform: uppercase;
  letter-spacing: .06em;
  margin-bottom: 4px;
}
.officer-major {
  font-size: .82rem;
  color: var(--gray-400);
  margin-bottom: 12px;
}
.officer-email {
  font-size: .85rem;
  color: var(--text-light);
  margin-bottom: 12px;
  overflow-wrap: anywhere;
}
.officer-email i {
  color: var(--maroon);
  margin-right: 4px;
}
.officer-bio {
  font-size: .9rem;
  color: var(--text-light);
  line-height: 1.6;
}

.leadership-cta {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}
.leadership-cta p {
  font-size: 1rem;
  color: var(--text-light);
  margin-bottom: 28px;
  line-height: 1.7;
}

/* ---------- Join Page ---------- */
.join-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}
.benefits-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.benefits-list li {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}
.benefits-list li i {
  color: var(--maroon);
  font-size: 1.2rem;
  margin-top: 3px;
  flex-shrink: 0;
}
.benefits-list li strong {
  display: block;
  font-size: .95rem;
  margin-bottom: 2px;
  color: var(--navy);
}
.benefits-list li p {
  font-size: .88rem;
  color: var(--text-light);
  margin: 0;
}

.join-card {
  padding: 40px;
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
}
.join-card h3 {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  color: var(--navy);
  margin-bottom: 8px;
}
.join-card > p {
  font-size: .92rem;
  color: var(--text-light);
  margin-bottom: 28px;
}
.join-steps {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 28px;
}
.join-step {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}
.step-number {
  width: 32px; height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--maroon);
  color: var(--white);
  border-radius: 50%;
  font-size: .8rem;
  font-weight: 700;
  flex-shrink: 0;
}
.join-step strong {
  display: block;
  font-size: .92rem;
  color: var(--navy);
  margin-bottom: 2px;
}
.join-step p {
  font-size: .82rem;
  color: var(--text-light);
  margin: 0;
}
.join-note {
  margin-top: 20px;
  font-size: .82rem;
  color: var(--gray-400);
  text-align: center;
  line-height: 1.7;
}

/* ---------- Contact Grid ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 32px;
  text-align: center;
}
.contact-item {
  padding: 40px 24px;
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}
.contact-item i {
  font-size: 1.6rem;
  color: var(--maroon);
  margin-bottom: 16px;
}
.contact-item h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 8px;
}
.contact-item p {
  font-size: .9rem;
  color: var(--text-light);
  line-height: 1.6;
}

/* ---------- Footer ---------- */
.footer {
  background: var(--navy);
  color: rgba(255,255,255,.6);
  padding: 64px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1rem;
  color: var(--white);
  margin-bottom: 12px;
}
.footer-logo-img {
  width: 32px;
  height: 32px;
  object-fit: contain;
}
.footer-tagline {
  font-style: italic;
  margin-top: 8px;
  font-size: .88rem;
}
.footer h4 {
  color: var(--white);
  font-size: .85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .08em;
  margin-bottom: 16px;
}
.footer-links ul, .footer-contact ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer a {
  color: rgba(255,255,255,.6);
  font-size: .9rem;
  transition: color var(--transition);
}
.footer a:hover { color: var(--white); }
.footer-contact i { margin-right: 8px; color: var(--gold); }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.1);
  padding-top: 24px;
  text-align: center;
  font-size: .82rem;
}
.footer-acs { margin-top: 6px; }
.footer-acs a { color: var(--gold); }
.footer-acs a:hover { color: var(--white); }

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .nav-links {
    position: fixed;
    top: 72px; left: 0; right: 0;
    background: var(--white);
    flex-direction: column;
    gap: 0;
    padding: 8px 0;
    border-bottom: 1px solid var(--gray-200);
    box-shadow: var(--shadow);
    transform: translateY(-120%);
    transition: transform var(--transition);
  }
  .nav-links.open { transform: translateY(0); }
  .nav-links a {
    display: block;
    padding: 14px 24px;
    font-size: 1rem;
  }
  .nav-links a::after { display: none; }

  .hero { min-height: 90vh; padding: 100px 24px 60px; }
  .section { padding: 64px 0; }
  .section-header { margin-bottom: 40px; }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .join-layout {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .event-card {
    flex-direction: column;
    gap: 16px;
  }
  .event-date {
    flex-direction: row;
    gap: 8px;
    width: fit-content;
  }
}

@media (max-width: 480px) {
  .hero-actions { flex-direction: column; align-items: center; }
  .btn { width: 100%; justify-content: center; }
  .highlights-grid { grid-template-columns: repeat(2, 1fr); }
  .highlight-item:last-child:nth-child(odd) { grid-column: 1 / -1; }
  .officer-card--top,
  .officer-card:not(.officer-card--top) { flex-basis: 100%; }
}