/* ===========================
   NYU Psi Chi — Global Styles
   Refined NYU-inspired design system
   =========================== */

/* 1. Design System — Custom Properties */
:root {
  /* Brand Colors */
  --nyu-violet: #57068c;
  --nyu-ultra-violet: #8900e1;
  --nyu-black: #111111;
  --nyu-white: #ffffff;

  /* Supporting Neutrals */
  --bg-main: #fcfbfe;
  --bg-soft: #f4eff8;
  --bg-section: #ffffff;
  --border-soft: #ddd3e8;
  --text-main: #171717;
  --text-muted: #4f4a57;

  /* Optional accent — use sparingly */
  --gold-accent: #f3c623;
  --gold-accent-hover: #ddb31e;

  /* Derived */
  --violet-dark: #3d0066;
  --violet-light: #7b2fa0;
  --violet-faint: rgba(87, 6, 140, 0.06);
  --violet-shadow: rgba(87, 6, 140, 0.10);

  /* Typography */
  --font-heading: "Montserrat", "Avenir Next", "Helvetica Neue", Arial, sans-serif;
  --font-body: "Helvetica Neue", Helvetica, Arial, sans-serif;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2.5rem;
  --space-2xl: 4rem;
  --space-3xl: 5.5rem;

  /* Layout */
  --max-width: 1100px;
  --header-height: 64px;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 10px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 14px rgba(87, 6, 140, 0.08);
  --shadow-lg: 0 8px 24px rgba(87, 6, 140, 0.12);

  /* Transitions */
  --transition: 0.25s ease;
  --transition-slow: 0.4s ease;
}

/* 2. Reset / Base */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

body {
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--text-main);
  background-color: var(--bg-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--nyu-violet);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--nyu-ultra-violet);
}

ul {
  list-style: none;
}

/* 3. Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  line-height: 1.2;
  color: var(--nyu-violet);
  margin-bottom: 0.75rem;
  font-weight: 700;
}

h1 {
  font-size: 3.5rem;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

h2 {
  font-size: 2.25rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.4rem;
  font-weight: 600;
}

p {
  margin-bottom: 1rem;
}

small, .text-sm {
  font-size: 0.875rem;
}

/* 4. Layout */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

main {
  flex: 1;
}

section {
  padding: var(--space-3xl) 0;
}

/* Alternating soft backgrounds — controlled via classes, not nth-of-type */
section.bg-soft {
  background-color: var(--bg-soft);
}

section.bg-white {
  background-color: var(--bg-section);
}

/* 5. Header */
.site-header {
  background-color: var(--nyu-white);
  border-bottom: 1px solid var(--border-soft);
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--nyu-violet);
  text-decoration: none;
  white-space: nowrap;
  letter-spacing: 0.5px;
}

.logo:hover {
  color: var(--violet-dark);
}

.logo-subtitle {
  display: none;
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--text-muted);
  letter-spacing: 0;
  line-height: 1.3;
  white-space: normal;
  max-width: 260px;
}

@media (min-width: 1024px) {
  .logo-subtitle {
    display: block;
  }
  .logo {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.15rem;
  }
  .logo .logo-top {
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }
}

/* 6. Navigation */
.main-nav ul {
  display: flex;
  gap: 0.15rem;
  align-items: center;
}

.main-nav a {
  display: block;
  padding: 0.45rem 0.75rem;
  color: var(--text-main);
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: background var(--transition), color var(--transition);
  letter-spacing: 0.01em;
}

.main-nav a:hover {
  color: var(--nyu-violet);
  background-color: var(--violet-faint);
}

.main-nav a.active {
  color: var(--nyu-violet);
  font-weight: 600;
  background-color: var(--violet-faint);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.35rem;
  color: var(--nyu-violet);
  cursor: pointer;
  padding: 0.25rem;
}

/* 7. Footer */
.site-footer {
  background-color: var(--nyu-black);
  color: var(--nyu-white);
  padding: var(--space-2xl) 0 var(--space-xl);
  margin-top: auto;
}

.site-footer .container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
  text-align: center;
}

.footer-identity {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.75);
  max-width: 420px;
  line-height: 1.5;
}

.footer-nav ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 1.5rem;
}

.footer-nav a {
  color: rgba(255, 255, 255, 0.7);
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 500;
  transition: color var(--transition);
}

.footer-nav a:hover {
  color: var(--nyu-white);
}

.footer-social {
  display: flex;
  gap: 1rem;
}

.footer-social a {
  color: rgba(255, 255, 255, 0.6);
  font-size: 1.15rem;
  transition: color var(--transition);
}

.footer-social a:hover {
  color: var(--nyu-white);
}

.footer-copy {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.4);
  margin-bottom: 0;
}

/* 8. Button System */
.btn {
  display: inline-block;
  padding: 0.6rem 1.5rem;
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  text-align: center;
  text-decoration: none;
  transition: background var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition);
  line-height: 1.4;
}

.btn:focus-visible {
  outline: 2px solid var(--nyu-ultra-violet);
  outline-offset: 2px;
}

.btn-primary {
  background-color: var(--nyu-violet);
  color: var(--nyu-white);
  border-color: var(--nyu-violet);
}

.btn-primary:hover {
  background-color: var(--violet-dark);
  border-color: var(--violet-dark);
  color: var(--nyu-white);
}

.btn-secondary,
.btn-outline {
  background-color: transparent;
  color: var(--nyu-violet);
  border-color: var(--nyu-violet);
}

.btn-secondary:hover,
.btn-outline:hover {
  background-color: var(--nyu-violet);
  color: var(--nyu-white);
}

.btn-text {
  background: none;
  border: none;
  color: var(--text-main);
  padding: 0.4rem 0;
  font-weight: 500;
}

.btn-text:hover {
  color: var(--nyu-violet);
}

/* Gold accent CTA (for time-sensitive actions only) */
.btn-gold {
  background-color: var(--gold-accent);
  color: var(--nyu-black);
  border-color: var(--gold-accent);
  font-weight: 700;
}

.btn-gold:hover {
  background-color: var(--gold-accent-hover);
  border-color: var(--gold-accent-hover);
  color: var(--nyu-black);
}

/* 9. Hero Section (Identity) */
.hero {
  background: linear-gradient(160deg, var(--nyu-violet) 0%, var(--violet-dark) 100%);
  color: var(--nyu-white);
  text-align: center;
  padding: var(--space-3xl) var(--space-lg);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255,255,255,0.04) 0%, transparent 70%);
  pointer-events: none;
}

.hero h1 {
  color: var(--nyu-white);
  font-size: 2.75rem;
  margin-bottom: 1rem;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  letter-spacing: -0.01em;
  line-height: 1.15;
}

.hero p {
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto 0;
  color: rgba(255, 255, 255, 0.85);
  font-weight: 400;
  line-height: 1.6;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
  margin-top: var(--space-lg);
}

.hero .btn-primary {
  background-color: var(--nyu-white);
  color: var(--nyu-violet);
  border-color: var(--nyu-white);
}

.hero .btn-primary:hover {
  background-color: rgba(255,255,255,0.9);
  color: var(--violet-dark);
}

.hero .btn-outline {
  border-color: rgba(255,255,255,0.5);
  color: var(--nyu-white);
}

.hero .btn-outline:hover {
  background-color: rgba(255,255,255,0.12);
  border-color: var(--nyu-white);
}

/* 10. Page Header */
.page-header {
  background: linear-gradient(160deg, var(--nyu-violet) 0%, var(--violet-dark) 100%);
  color: var(--nyu-white);
  text-align: center;
  padding: var(--space-2xl) var(--space-lg);
}

.page-header h1 {
  color: var(--nyu-white);
  font-size: 2.5rem;
  margin-bottom: 0.25rem;
}

.page-header p {
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 0;
  font-size: 1.05rem;
}

/* 11. Announcement Hero — card-like treatment */
.announcement-hero {
  background-color: var(--bg-soft);
  color: var(--text-main);
  text-align: center;
  padding: var(--space-2xl) var(--space-lg);
  position: relative;
}

.announcement-card {
  background: var(--nyu-white);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  padding: var(--space-xl) var(--space-xl);
  max-width: 720px;
  margin: 0 auto;
  box-shadow: var(--shadow-md);
}

.announcement-eyebrow {
  display: inline-block;
  background-color: var(--nyu-violet);
  color: var(--nyu-white);
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.85rem;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: var(--space-md);
}

.announcement-hero h2 {
  color: var(--nyu-violet);
  font-size: 1.85rem;
  margin-bottom: 0.5rem;
  line-height: 1.2;
}

.announcement-hero p {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 560px;
  margin: 0 auto var(--space-md);
  line-height: 1.6;
}

.announcement-dates {
  list-style: none;
  padding: 0;
  margin: 0 auto var(--space-lg);
  max-width: 360px;
  text-align: left;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-main);
}

.announcement-dates li {
  margin-bottom: 0.45rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.announcement-dates li i {
  color: var(--nyu-violet);
  font-size: 0.85rem;
  width: 1.2rem;
  text-align: center;
  flex-shrink: 0;
}

.announcement-hero .hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

.announcement-hero .btn-gold {
  background-color: var(--gold-accent);
  color: var(--nyu-black);
  border-color: var(--gold-accent);
}

.announcement-hero .btn-gold:hover {
  background-color: var(--gold-accent-hover);
  border-color: var(--gold-accent-hover);
}

/* 12. Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--space-lg);
}

.card {
  background: var(--nyu-white);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: box-shadow var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-lg);
}

.card-img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  background-color: var(--bg-soft);
}

.card-body {
  padding: var(--space-lg);
}

.card-body h3 {
  font-size: 1.1rem;
  color: var(--nyu-violet);
  margin-bottom: 0.35rem;
}

.card-body h3 i {
  font-size: 0.95rem;
  margin-right: 0.35rem;
  opacity: 0.8;
}

.card-body p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 0;
  line-height: 1.6;
}

/* 13. Forms */
.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  font-family: var(--font-heading);
  font-weight: 600;
  margin-bottom: 0.3rem;
  font-size: 0.9rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.6rem 0.75rem;
  font-size: 0.95rem;
  font-family: var(--font-body);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--nyu-violet);
  box-shadow: 0 0 0 3px rgba(87, 6, 140, 0.12);
}

.form-group textarea {
  min-height: 130px;
  resize: vertical;
}

/* 14. Content Sections */
.text-section {
  max-width: 680px;
  margin: 0 auto;
}

.section-title {
  text-align: center;
  margin-bottom: var(--space-xl);
  color: var(--nyu-violet);
  position: relative;
  padding-bottom: 0.75rem;
}

.section-title::after {
  content: '';
  display: block;
  width: 40px;
  height: 2px;
  background-color: var(--nyu-violet);
  margin: 0.6rem auto 0;
  opacity: 0.5;
}

/* Video embed */
.video-wrapper {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  max-width: 720px;
  margin: 0 auto 2rem;
  border-radius: var(--radius-lg);
}

.video-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

/* Events list */
.event-item {
  background: var(--nyu-white);
  border-left: 3px solid var(--nyu-violet);
  padding: var(--space-lg);
  margin-bottom: var(--space-md);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  box-shadow: var(--shadow-sm);
}

.event-item h3 {
  margin-bottom: 0.3rem;
}

.event-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

/* FAQ accordion */
.faq-item {
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  margin-bottom: 0.75rem;
  overflow: hidden;
}

.faq-item summary {
  padding: 1rem 1.25rem;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  background-color: var(--bg-section);
  transition: background var(--transition);
  color: var(--text-main);
}

.faq-item summary:hover {
  background-color: var(--bg-soft);
}

.faq-item[open] summary {
  border-bottom: 1px solid var(--border-soft);
  color: var(--nyu-violet);
}

.faq-item .faq-answer {
  padding: 1rem 1.25rem;
}

/* Placeholder badge */
.placeholder-badge {
  display: inline-block;
  background: var(--gold-accent);
  color: var(--nyu-black);
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  border-radius: 3px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  vertical-align: middle;
  margin-left: 0.35rem;
}

/* Requirements list (membership page) */
.requirements-list {
  list-style: disc;
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

.requirements-list li {
  list-style: disc;
  margin-bottom: 0.5rem;
  line-height: 1.7;
}

/* FAQ list / answer lists */
.faq-list {
  max-width: 720px;
  margin: 0 auto;
}

.faq-answer ul {
  list-style: disc;
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

.faq-answer ul li {
  list-style: disc;
  margin-bottom: 0.35rem;
}

.faq-answer h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--nyu-violet);
  margin-bottom: 0.5rem;
  margin-top: 1rem;
}

.faq-answer h4:first-child {
  margin-top: 0;
}

/* 15. Utilities */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

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

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }

/* 16. Media Queries */

/* Tablet and below */
@media (max-width: 768px) {
  .nav-toggle {
    display: block;
  }

  .main-nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--nyu-white);
    border-bottom: 1px solid var(--border-soft);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  }

  .main-nav.open {
    display: block;
  }

  .main-nav ul {
    flex-direction: column;
    padding: 0.5rem 0;
  }

  .main-nav a {
    padding: 0.7rem 1.25rem;
    border-radius: 0;
  }

  h1 { font-size: 2.5rem; }
  h2 { font-size: 1.75rem; }

  .hero {
    padding: var(--space-2xl) var(--space-lg);
  }

  .hero h1 {
    font-size: 2.25rem;
  }

  .announcement-hero h2 {
    font-size: 1.6rem;
  }

  .announcement-card {
    padding: var(--space-xl) var(--space-lg);
  }

  .page-header h1 {
    font-size: 2rem;
  }

  .card-grid {
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  }

  section {
    padding: var(--space-2xl) 0;
  }
}

/* Small phones */
@media (max-width: 480px) {
  h1 { font-size: 2rem; }

  .hero h1 {
    font-size: 1.85rem;
  }

  .hero {
    padding: var(--space-xl) var(--space-lg);
  }

  .hero p {
    font-size: 1rem;
  }

  .announcement-hero h2 {
    font-size: 1.4rem;
  }

  .announcement-card {
    padding: var(--space-lg) var(--space-md);
  }

  .page-header {
    padding: var(--space-xl) var(--space-lg);
  }

  .page-header h1 {
    font-size: 1.65rem;
  }

  section {
    padding: var(--space-xl) 0;
  }

  .footer-nav ul {
    flex-direction: column;
    gap: 0.4rem;
  }
}