@import url('https://fonts.googleapis.com/css2?family=PT+Sans:wght@400;700&display=swap');

:root{
  /* Colors – picked to match the provided screenshot */
  --header-bg: #183a57;
  --subheader-bg: #81909d;
  --page-bg: #d5d4d3;
  --panel-bg: #dfdede;
  --footer-bg: #434343;

  --ink: #1a1a1a;
  --ink-muted: #4a4a4a;
  --ink-invert: #ffffff;

  --border: rgba(0,0,0,.14);
  --border-strong: rgba(0,0,0,.22);

  /* Layout */
  --container: 1200px;
  --gutter: clamp(16px, 3vw, 40px);

  /* Spacing scale */
  --s1: 4px;
  --s2: 8px;
  --s3: 12px;
  --s4: 16px;
  --s5: 24px;
  --s6: 32px;
  --s7: 48px;
  --s8: 64px;

  /* Type */
  --font: "PT Sans", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  --fs-base: clamp(16px, 1.05vw, 18px);
  --lh: 1.45;

  /* Shape */
  --r1: 10px;
  --r2: 14px;

  /* Shadow */
  --shadow: 0 6px 18px rgba(0,0,0,.10);
}

*{ box-sizing: border-box; }
html, body{ height: 100%; }
body{
  margin: 0;
  font-family: var(--font);
  font-size: var(--fs-base);
  line-height: var(--lh);
  color: var(--ink);
  background: var(--page-bg);
}

img, svg{ display: block; max-width: 100%; }
a{ color: inherit; text-decoration: none; }

.container{
  width: min(var(--container), calc(100% - var(--gutter)*2));
  margin-inline: auto;
}

.site-header{
  background: var(--header-bg);
  color: var(--ink-invert);
}
.site-header__inner{
  padding-block: var(--s7);
  display: flex;
  justify-content: center;
}
.site-header__title{
  font-weight: 700;
  font-size: clamp(20px, 1.6vw, 28px);
  letter-spacing: .2px;
}

.site-subheader{
  background: var(--subheader-bg);
  color: var(--ink);
}
.site-subheader__inner{
  padding-block: var(--s4);
  display: flex;
  justify-content: center;
}
.site-subheader__title{
  font-weight: 400;
  font-size: clamp(18px, 1.3vw, 22px);
}

.page{
  padding-block: var(--s5);
}

.section{
  padding-block: var(--s3);
}

.section__grid{
  display: grid;
  gap: var(--s5);
  align-items: start;
}

@media (min-width: 960px){
  .section__grid{
    grid-template-columns: minmax(0, 2.2fr) minmax(280px, 1fr);
    align-items: stretch;
  }
}

.video-card{
  background: rgba(255,255,255,.35);
  border: 1px solid var(--border);
  border-radius: var(--r2);
  box-shadow: var(--shadow);
  padding: var(--s2);
}

.video-embed{
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: calc(var(--r2) - 4px);
  background: #0b0b0b;
}
.video-embed iframe{
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.side-card{
  position: relative;
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: var(--r2);
  box-shadow: var(--shadow);
  padding: var(--s7) var(--s6);
  display: grid;
  place-items: center;
  text-align: center;
  overflow: hidden;
}

.side-card__content{
  width: min(48ch, 100%);
}

.side-card__title{
  margin: 0 0 var(--s2) 0;
  font-size: clamp(20px, 1.6vw, 28px);
  font-weight: 700;
}

.side-card__subtitle{
  margin: 0 0 var(--s4) 0;
  font-size: clamp(16px, 1.2vw, 20px);
  color: var(--ink-muted);
}

.side-card__body p{
  margin: 0 0 var(--s2) 0;
  color: var(--ink-muted);
}

.nav-btn{
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 52px;
  height: 52px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,.18);
  color: var(--ink);
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: background .15s ease, border-color .15s ease, transform .15s ease;
}
.nav-btn svg{
  width: 26px;
  height: 26px;
}
.nav-btn--prev{ left: var(--s4); }
.nav-btn--next{ right: var(--s4); }

.nav-btn:hover{
  background: rgba(255,255,255,.32);
  border-color: var(--border-strong);
}
.nav-btn:active{
  transform: translateY(-50%) scale(.98);
}
.nav-btn:focus-visible{
  outline: 3px solid rgba(24,58,87,.35);
  outline-offset: 2px;
}

.section-divider{
  padding-block: var(--s5);
}
.section-divider__line{
  width: min(72ch, 100%);
  margin-inline: auto;
  border-top: 1px dashed rgba(0,0,0,.40);
}

/* Footer */
.site-footer{
  background: var(--footer-bg);
  color: var(--ink-invert);
  margin-top: var(--s6);
}
.site-footer__inner{
  padding-block: var(--s6);
  display: flex;
  justify-content: center;
}
.site-footer__title{
  font-weight: 700;
  font-size: clamp(18px, 1.3vw, 22px);
}

/* Auth (login) */
.auth-shell{
  min-height: calc(100vh - 240px);
  display: grid;
  place-items: center;
  padding-block: var(--s6);
}
.auth-card{
  width: min(520px, 100%);
  background: rgba(255,255,255,.40);
  border: 1px solid var(--border);
  border-radius: var(--r2);
  box-shadow: var(--shadow);
  padding: var(--s6);
}

.field{ margin-bottom: var(--s4); }
.label{
  display: block;
  margin-bottom: var(--s2);
  font-weight: 700;
}
.input{
  width: 100%;
  padding: 12px 14px;
  border-radius: var(--r1);
  border: 1px solid var(--border);
  background: rgba(255,255,255,.55);
  font: inherit;
}
.input:focus-visible{
  outline: 3px solid rgba(24,58,87,.28);
  outline-offset: 2px;
}

.btn{
  width: 100%;
  padding: 12px 14px;
  border-radius: var(--r1);
  border: 1px solid rgba(0,0,0,.18);
  background: var(--header-bg);
  color: var(--ink-invert);
  font-weight: 700;
  cursor: pointer;
  transition: filter .15s ease, transform .15s ease;
}
.btn:hover{ filter: brightness(1.05); }
.btn:active{ transform: scale(.99); }
.btn:focus-visible{
  outline: 3px solid rgba(24,58,87,.35);
  outline-offset: 2px;
}

.alert{
  margin-top: var(--s3);
  padding: var(--s3) var(--s4);
  border-radius: var(--r1);
  border: 1px solid rgba(0,0,0,.14);
  background: rgba(255,255,255,.45);
  color: var(--ink);
}

.page-actions {
  padding-block: var(--s5) var(--s6);
}

.page-actions__form {
  max-width: 320px;
  margin: 0 auto;
}

.video-embed__placeholder {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  text-align: center;
  color: #e5e7eb;
  padding: var(--s5);
}