/* ==================================================
   FMF200
   The Future of Mathematical Finance
   University of Toronto
   ================================================== */

:root {
  --navy: #002a5c;
  --navy-dark: #001b3a;
  --blue: #1e3765;
  --blue-light: #4b8fd8;
  --cyan: #32c5ff;
  --sky: #dbe8f5;

  --ink: #17212b;
  --muted: #5f6b76;

  --paper: #ffffff;
  --soft: #f5f7fa;
  --line: #d9e0e7;

  --accent: #ffd400;

  --max: 1180px;
  --radius: 18px;

  --shadow: 0 16px 40px rgba(0, 42, 92, 0.12);
}


/* ==================================================
   RESET & BASE
   ================================================== */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
}

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

a {
  color: inherit;
}

button,
input,
textarea,
select {
  font: inherit;
}


/* ==================================================
   ACCESSIBILITY
   ================================================== */

.skip-link {
  position: absolute;
  left: -9999px;
}

.skip-link:focus {
  left: 16px;
  top: 16px;

  z-index: 9999;

  padding: 10px 14px;

  background: #ffffff;
  color: var(--navy);

  border-radius: 4px;
}


/* ==================================================
   LAYOUT
   ================================================== */

.container {
  width: min(var(--max), calc(100% - 48px));
  margin-left: auto;
  margin-right: auto;
}


/* ==================================================
   HEADER
   ================================================== */

.site-header {
  position: sticky;
  top: 0;

  z-index: 1000;

  width: 100%;

  background: rgba(255, 255, 255, 0.97);

  border-bottom: 1px solid var(--line);
}

.header-inner {
  min-height: 78px;

  display: flex;
  align-items: center;

  gap: 30px;
}


/* ==================================================
   BRAND
   ================================================== */

.brand {
  display: flex;
  align-items: baseline;

  gap: 10px;

  white-space: nowrap;
  text-decoration: none;
}

.brand strong {
  color: var(--navy);

  font-size: 1.45rem;
  line-height: 1;
}

.brand span {
  color: var(--muted);

  font-size: 0.78rem;
  font-weight: 700;

  text-transform: uppercase;
  letter-spacing: 0.08em;
}


/* ==================================================
   DESKTOP NAVIGATION
   ================================================== */

.main-nav {
  margin-left: auto;

  display: flex;
  align-items: center;

  gap: 25px;
}

.main-nav a {
  padding: 27px 0 24px;

  border-bottom: 3px solid transparent;

  text-decoration: none;

  font-size: 0.92rem;
  font-weight: 700;

  white-space: nowrap;
}

.main-nav a:hover,
.main-nav a:focus,
.main-nav a.active {
  color: var(--navy);
  border-color: var(--navy);
}


/* ==================================================
   MOBILE MENU BUTTON
   ================================================== */

.nav-toggle {
  display: none;

  margin-left: auto;

  width: 46px;
  height: 46px;

  padding: 9px;

  border: 0;

  background: transparent;
  color: var(--navy);

  cursor: pointer;
}

.nav-toggle span {
  display: block;

  width: 25px;
  height: 2px;

  margin: 5px auto;

  background: currentColor;

  transition:
    transform 0.2s ease,
    opacity 0.2s ease;
}


/* ==================================================
   HERO
   ================================================== */

.hero {
  position: relative;

  min-height: 650px;

  display: flex;
  align-items: center;

  overflow: hidden;

  padding: 90px 0;

  color: #ffffff;

  background:
    radial-gradient(
      circle at 75% 45%,
      rgba(30, 102, 165, 0.34),
      transparent 34%
    ),
    linear-gradient(
      120deg,
      #00182f 0%,
      #002a5c 48%,
      #07345e 100%
    );
}


/*
   Interactive canvas
   --------------------------------------------------
   JavaScript draws the chart here.
*/

#finance-canvas {
  position: absolute;

  inset: 0;

  z-index: 0;

  width: 100%;
  height: 100%;

  pointer-events: auto;
}


/*
   Slight darkening over the canvas so the title
   always remains readable.
*/

.hero::before {
  content: "";

  position: absolute;
  inset: 0;

  z-index: 1;

  pointer-events: none;

  background:
    linear-gradient(
      90deg,
      rgba(0, 20, 43, 0.94) 0%,
      rgba(0, 30, 61, 0.83) 37%,
      rgba(0, 35, 69, 0.32) 67%,
      rgba(0, 28, 58, 0.12) 100%
    );
}


/*
   Hero content sits above canvas.
*/

.hero-grid {
  position: relative;

  z-index: 2;

  display: grid;

  grid-template-columns:
    minmax(0, 1.35fr)
    minmax(180px, 0.65fr);

  gap: 70px;

  align-items: center;
}


/* Hero copy */

.hero-copy {
  max-width: 760px;
}

.eyebrow {
  margin: 0 0 16px;

  color: var(--accent);

  font-size: 0.8rem;
  font-weight: 800;

  text-transform: uppercase;
  letter-spacing: 0.14em;
}

.hero h1 {
  max-width: 850px;

  margin: 0 0 24px;

  color: #ffffff;

  font-size: clamp(3.2rem, 6vw, 5.8rem);
  font-weight: 700;

  line-height: 0.97;

  letter-spacing: -0.055em;
}

.hero .subtitle {
  max-width: 680px;

  margin: 0;

  color: #e7eef8;

  font-size: clamp(1.08rem, 1.8vw, 1.35rem);

  line-height: 1.55;
}


/* Hero details */

.hero-details {
  display: flex;
  flex-wrap: wrap;

  gap: 34px;

  margin-top: 32px;
}

.hero-detail {
  min-width: 180px;

  display: flex;
  flex-direction: column;

  padding-left: 17px;

  border-left: 2px solid rgba(255, 212, 0, 0.9);
}

.hero-detail-label {
  margin-bottom: 3px;

  color: #b9cbe0;

  font-size: 0.72rem;
  font-weight: 800;

  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.hero-detail strong {
  color: #ffffff;

  font-size: 1.02rem;
}


/* Right-hand hero label */

.hero-side {
  display: flex;

  justify-content: flex-end;
  align-items: center;

  min-height: 300px;
}

.hero-side-label {
  display: flex;
  flex-direction: column;

  gap: 7px;

  padding-left: 20px;

  border-left: 1px solid rgba(255, 255, 255, 0.35);

  color: rgba(255, 255, 255, 0.72);

  font-size: 0.78rem;
  font-weight: 700;

  text-transform: uppercase;
  letter-spacing: 0.28em;
}


/* ==================================================
   BUTTONS
   ================================================== */

.actions {
  display: flex;
  flex-wrap: wrap;

  gap: 14px;

  margin-top: 32px;
}

.btn {
  display: inline-block;

  padding: 13px 21px;

  border: 2px solid var(--navy);
  border-radius: 999px;

  text-decoration: none;

  font-weight: 800;

  transition:
    transform 0.18s ease,
    background 0.18s ease,
    color 0.18s ease,
    border-color 0.18s ease;
}

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

.btn-primary {
  background: var(--navy);
  color: #ffffff;
}

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


/* Hero buttons */

.hero .btn-primary {
  background: var(--accent);
  border-color: var(--accent);

  color: var(--navy);
}

.hero .btn-primary:hover,
.hero .btn-primary:focus-visible {
  background: #ffe34c;
  border-color: #ffe34c;
}

.hero .btn-secondary {
  color: #ffffff;

  border-color: rgba(255, 255, 255, 0.8);
}

.hero .btn-secondary:hover,
.hero .btn-secondary:focus-visible {
  background: #ffffff;

  color: var(--navy);

  border-color: #ffffff;
}


/* ==================================================
   SECTIONS
   ================================================== */

.section {
  padding: 80px 0;
}

.section-soft {
  background: var(--soft);
}

.section-kicker {
  margin-bottom: 8px;

  color: var(--navy);

  font-size: 0.8rem;
  font-weight: 800;

  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.section h2,
.page-hero h1 {
  margin: 10px 0 22px;

  color: var(--navy);

  font-size: clamp(2.2rem, 4vw, 3.6rem);

  line-height: 1.05;

  letter-spacing: -0.035em;
}

.lead {
  max-width: 780px;

  color: #394652;

  font-size: 1.22rem;
}

.two-col {
  display: grid;

  grid-template-columns: 1.1fr 0.9fr;

  gap: 70px;

  align-items: start;
}


/* ==================================================
   STATS
   ================================================== */

.stats {
  display: grid;

  grid-template-columns: repeat(4, 1fr);

  gap: 18px;
}

.stat {
  padding: 26px;

  background: #ffffff;

  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.stat strong {
  display: block;

  margin-bottom: 4px;

  color: var(--navy);

  font-size: 1.7rem;
}


/* ==================================================
   CARDS
   ================================================== */

.cards {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
}

.card {
  padding: 26px;

  background: #ffffff;

  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.card h3 {
  margin: 0 0 8px;

  color: var(--navy);

  font-size: 1.3rem;
}

.speaker-photo {
  aspect-ratio: 4 / 3;

  margin-bottom: 20px;

  display: grid;
  place-items: center;

  background:
    linear-gradient(
      135deg,
      var(--sky),
      #eef3f8
    );

  border-radius: 12px;

  color: var(--navy);

  font-weight: 800;
}

.muted {
  color: var(--muted);
}


/* ==================================================
   FEATURE BLOCK
   ================================================== */

.feature {
  padding: 44px;

  background: var(--navy);

  color: #ffffff;

  border-radius: 26px;
}

.feature h2,
.feature h3 {
  color: #ffffff;
}

.feature .section-kicker {
  color: var(--accent);
}

.feature .btn-primary {
  background: var(--accent);
  border-color: var(--accent);

  color: var(--navy);
}


/* ==================================================
   INTERIOR PAGE HERO
   ================================================== */

.page-hero {
  padding: 70px 0;

  background: var(--soft);

  border-bottom: 1px solid var(--line);
}

.page-content {
  padding: 64px 0 90px;
}

.page-content h2 {
  margin-top: 42px;

  color: var(--navy);
}


/* ==================================================
   PROGRAM
   ================================================== */

.schedule {
  border-top: 1px solid var(--line);
}

.schedule-row {
  display: grid;

  grid-template-columns: 150px 1fr;

  gap: 25px;

  padding: 22px 0;

  border-bottom: 1px solid var(--line);
}

.schedule-time {
  color: var(--navy);

  font-weight: 800;
}


/* ==================================================
   NOTICE
   ================================================== */

.notice {
  padding: 20px 24px;

  background: var(--sky);

  border-left: 4px solid var(--navy);
  border-radius: 8px;
}


/* ==================================================
   FOOTER
   ================================================== */

.site-footer {
  padding: 55px 0 30px;

  background: #071f3d;

  color: #ffffff;
}

.footer-grid {
  display: grid;

  grid-template-columns: 1.5fr 1fr 1fr;

  gap: 45px;
}

.site-footer h3 {
  margin-top: 0;
}

.site-footer a {
  color: #ffffff;
}

.footer-bottom {
  margin-top: 40px;
  padding-top: 22px;

  border-top: 1px solid rgba(255, 255, 255, 0.2);

  color: #c9d4e1;

  font-size: 0.9rem;
}


/* ==================================================
   TABLET / MOBILE
   ================================================== */

@media (max-width: 960px) {

  .brand span {
    display: none;
  }

  .nav-toggle {
    display: block;
  }

  .main-nav {
    display: none;

    position: absolute;

    top: 78px;
    left: 0;
    right: 0;

    flex-direction: column;
    align-items: stretch;

    gap: 0;

    padding: 15px 24px 25px;

    background: #ffffff;

    border-bottom: 1px solid var(--line);

    box-shadow: var(--shadow);
  }

  .main-nav.is-open {
    display: flex;
  }

  .main-nav a {
    padding: 13px 0;

    border-bottom: 1px solid var(--line);
  }

  .nav-toggle.is-open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav-toggle.is-open span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.is-open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }


  /* Hero */

  .hero {
    min-height: 610px;

    padding: 75px 0;
  }

  .hero-grid {
    grid-template-columns: 1fr;

    gap: 30px;
  }

  .hero-copy {
    max-width: 720px;
  }

  .hero-side {
    display: none;
  }

  .hero::before {
    background:
      linear-gradient(
        90deg,
        rgba(0, 20, 43, 0.93) 0%,
        rgba(0, 30, 61, 0.73) 65%,
        rgba(0, 35, 69, 0.35) 100%
      );
  }


  /* General layout */

  .two-col {
    grid-template-columns: 1fr;
  }

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

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

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


/* ==================================================
   SMALL MOBILE
   ================================================== */

@media (max-width: 620px) {

  .container {
    width: min(100% - 36px, var(--max));
  }


  /* Header */

  .brand strong {
    font-size: 1.3rem;
  }


  /* Hero */

  .hero {
    min-height: 620px;

    padding: 58px 0 64px;
  }

  .hero h1 {
    font-size: clamp(3rem, 15vw, 4.2rem);
  }

  .hero .subtitle {
    font-size: 1.05rem;
  }

  .hero-details {
    flex-direction: column;

    gap: 18px;
  }

  .hero-detail {
    min-width: 0;
  }

  .hero .actions {
    flex-direction: column;

    align-items: stretch;
  }

  .hero .btn {
    width: 100%;

    text-align: center;
  }


  /* Sections */

  .section {
    padding: 58px 0;
  }

  .stats,
  .cards,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .schedule-row {
    grid-template-columns: 1fr;

    gap: 4px;
  }

  .page-hero {
    padding: 52px 0;
  }

  .feature {
    padding: 30px;
  }
}


/* ==================================================
   REDUCED MOTION
   ================================================== */

@media (prefers-reduced-motion: reduce) {

  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}