/* ================================================================
   Kat Serial HD — Modern UI System
   Architecture : BEM + CSS Custom Properties (Design Tokens)
   Layout       : Mobile-First Flexbox / Grid
   Theme        : Dark Glassmorphism | Midnight-Indigo × Cyan
   ================================================================ */

/* ── 1. Modern CSS Reset ──────────────────────────────────────── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 100%;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  tab-size: 4;
}

body {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, picture, video, canvas, svg { display: block; max-width: 100%; }
input, button, textarea, select  { font: inherit; }
p, h1, h2, h3, h4, h5, h6       { overflow-wrap: break-word; }
ul, ol                           { list-style: none; }
a                                { text-decoration: none; color: inherit; }

/* ── 2. Design Tokens ─────────────────────────────────────────── */
:root {
  /* Color Palette */
  --clr-bg:             #080c18;
  --clr-bg-alt:         #0d1225;
  --clr-surface:        rgba(255, 255, 255, 0.05);
  --clr-surface-hover:  rgba(255, 255, 255, 0.09);
  --clr-border:         rgba(255, 255, 255, 0.1);
  --clr-accent:         #7c3aed;
  --clr-accent-light:   #a78bfa;
  --clr-accent-glow:    rgba(124, 58, 237, 0.35);
  --clr-cyan:           #06b6d4;
  --clr-text-primary:   #f1f5f9;
  --clr-text-secondary: #94a3b8;
  --clr-text-muted:     #475569;
  --clr-success:        #10b981;
  --clr-danger:         #f87171;

  /* Fluid Type Scale — clamp(min, preferred vw, max) */
  --font-sans: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --fs-xs:   clamp(0.694rem,  0.6vw  + 0.55rem, 0.8rem);
  --fs-sm:   clamp(0.833rem,  0.7vw  + 0.65rem, 0.938rem);
  --fs-base: clamp(1rem,      0.9vw  + 0.75rem, 1.125rem);
  --fs-md:   clamp(1.2rem,    1.2vw  + 0.85rem, 1.375rem);
  --fs-lg:   clamp(1.44rem,   1.8vw  + 0.9rem,  1.875rem);
  --fs-xl:   clamp(1.728rem,  2.5vw  + 1rem,    2.5rem);
  --fs-2xl:  clamp(2.074rem,  3.5vw  + 1rem,    3.375rem);

  /* 8px Spacing System */
  --sp-1:  0.5rem;   /* 8px  */
  --sp-2:  1rem;     /* 16px */
  --sp-3:  1.5rem;   /* 24px */
  --sp-4:  2rem;     /* 32px */
  --sp-5:  2.5rem;   /* 40px */
  --sp-6:  3rem;     /* 48px */
  --sp-8:  4rem;     /* 64px */
  --sp-10: 5rem;     /* 80px */

  /* Layout */
  --max-width:   80rem;
  --nav-height:  4rem;
  --gutter:      clamp(1rem, 4vw, 2rem);
  --card-radius: 1rem;
  --radius-sm:   0.5rem;
  --radius-pill: 9999px;

  /* Glassmorphism */
  --glass-bg:     rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-blur:   14px;
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.45);

  /* Motion — Bezier Curves */
  --ease-out-expo:    cubic-bezier(0.19, 1, 0.22, 1);
  --ease-spring:      cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-in-out-circ: cubic-bezier(0.785, 0.135, 0.15, 0.86);
  --dur-fast: 150ms;
  --dur-base: 250ms;
  --dur-slow: 400ms;
}

/* ── 3. Base ──────────────────────────────────────────────────── */
body {
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: 1.65;
  color: var(--clr-text-primary);
  background-color: var(--clr-bg);
  background-image:
    radial-gradient(ellipse 80% 60% at 20% -10%, rgba(124, 58, 237, 0.15) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 80% 110%, rgba(6, 182, 212, 0.08) 0%, transparent 55%);
  background-attachment: fixed;
}

/* ── 4. Layout ────────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ── 5. Site Header — sticky glassmorphism bar ────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  background: rgba(8, 12, 24, 0.82);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-bottom: 1px solid var(--clr-border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.site-header__brand {
  font-size: var(--fs-md);
  font-weight: 800;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--clr-accent-light) 30%, var(--clr-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ── 6. Navigation ────────────────────────────────────────────── */
.nav__list {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
}

.nav__link {
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--clr-text-secondary);
  padding: 0.375rem var(--sp-2);
  border-radius: var(--radius-sm);
  transition:
    color       var(--dur-base) var(--ease-out-expo),
    background  var(--dur-base) var(--ease-out-expo);
}

.nav__link:hover,
.nav__link--active {
  color: var(--clr-text-primary);
  background: var(--clr-surface-hover);
}

/* ── 7. Site Main ─────────────────────────────────────────────── */
.site-main {
  flex: 1;
  padding-block: var(--sp-6) var(--sp-10);
}

/* ── 8. Section ───────────────────────────────────────────────── */
.section {
  margin-bottom: var(--sp-8);
}

.section__title {
  position: relative;
  display: inline-block;
  font-size: var(--fs-lg);
  font-weight: 700;
  letter-spacing: -0.025em;
  margin-bottom: var(--sp-4);
}

.section__title::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -0.4em;
  width: 2.5rem;
  height: 3px;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--clr-accent), var(--clr-cyan));
}

/* ── 9. Card Grid ─────────────────────────────────────────────── */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 14rem), 1fr));
  gap: var(--sp-3);
}

/* ── 10. Card — BEM block, glassmorphism ──────────────────────── */
.card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--card-radius);
  overflow: hidden;
  cursor: pointer;
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  box-shadow: var(--glass-shadow);
  transition:
    transform     var(--dur-slow) var(--ease-spring),
    box-shadow    var(--dur-slow) var(--ease-out-expo),
    border-color  var(--dur-base) var(--ease-out-expo),
    background    var(--dur-base) var(--ease-out-expo);
  outline-offset: 3px;
}

.card:hover,
.card:focus-visible {
  transform: translateY(-6px) scale(1.018);
  box-shadow:
    var(--glass-shadow),
    0 0 0 1px rgba(167, 139, 250, 0.4),
    0 20px 56px var(--clr-accent-glow);
  border-color: rgba(167, 139, 250, 0.35);
  background: var(--clr-surface-hover);
}

.card:focus-visible {
  outline: 2px solid var(--clr-accent-light);
}

/* card__thumbnail — element */
.card__thumbnail {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: #000;
}

.card__thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--dur-slow) var(--ease-out-expo);
  user-select: none;
}

.card:hover .card__thumbnail img {
  transform: scale(1.06);
}

/* card__thumbnail--play — modifier: video play-icon overlay */
.card__thumbnail--play {
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(145deg, #0f1526 0%, #1a1040 100%);
  font-size: clamp(2rem, 5vw, 2.75rem);
  color: var(--clr-text-muted);
  transition: color var(--dur-base) var(--ease-out-expo);
}

.card:hover .card__thumbnail--play {
  color: var(--clr-accent-light);
}

/* card__body — element */
.card__body {
  padding: var(--sp-2) var(--sp-2) var(--sp-3);
}

/* card__title — element */
.card__title {
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--clr-text-primary);
  line-height: 1.45;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color var(--dur-fast) var(--ease-out-expo);
}

.card:hover .card__title {
  color: var(--clr-accent-light);
}

/* ── 11. Page Hero ────────────────────────────────────────────── */
.page-hero {
  padding-block: var(--sp-5) var(--sp-4);
  border-bottom: 1px solid var(--clr-border);
  margin-bottom: var(--sp-5);
}

.page-hero__title {
  font-size: var(--fs-xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  background: linear-gradient(135deg, var(--clr-text-primary) 40%, var(--clr-accent-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ── 12. Video Player ─────────────────────────────────────────── */
.player {
  padding-block: var(--sp-1);
}

.player__wrapper {
  position: relative;
  width: 100%;
  max-width: 56rem;
  margin-inline: auto;
  border-radius: var(--card-radius);
  overflow: hidden;
  box-shadow: var(--glass-shadow), 0 0 80px var(--clr-accent-glow);
  border: 1px solid var(--glass-border);
  background: #000;
  aspect-ratio: 16 / 9;
}

.player__iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: none;
  display: block;
}

/* ── 13. Form — BEM block ─────────────────────────────────────── */
.form {
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
  max-width: 34rem;
}

.form__group {
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
}

.form__label {
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--clr-text-secondary);
  letter-spacing: 0.02em;
}

.form__control {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  color: var(--clr-text-primary);
  font-size: var(--fs-base);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition:
    border-color  var(--dur-base) var(--ease-out-expo),
    box-shadow    var(--dur-base) var(--ease-out-expo),
    background    var(--dur-base) var(--ease-out-expo);
  outline: none;
}

.form__control:focus {
  border-color: var(--clr-accent);
  box-shadow: 0 0 0 3px var(--clr-accent-glow);
  background: var(--clr-surface-hover);
}

.form__control::placeholder {
  color: var(--clr-text-muted);
}

select.form__control {
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%2394a3b8' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
  cursor: pointer;
}

select.form__control option {
  background: #0d1225;
  color: var(--clr-text-primary);
}

/* ── 14. Button — BEM block ───────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  padding: 0.75rem 1.875rem;
  font-size: var(--fs-sm);
  font-weight: 600;
  border-radius: var(--radius-pill);
  border: none;
  cursor: pointer;
  white-space: nowrap;
  outline-offset: 3px;
  transition:
    transform   var(--dur-base) var(--ease-spring),
    box-shadow  var(--dur-base) var(--ease-out-expo),
    background  var(--dur-base) var(--ease-out-expo),
    opacity     var(--dur-fast) ease;
}

.btn:focus-visible {
  outline: 2px solid var(--clr-accent-light);
}

/* btn--primary — modifier */
.btn--primary {
  background: linear-gradient(135deg, var(--clr-accent) 0%, #9333ea 100%);
  color: #fff;
  box-shadow: 0 4px 20px var(--clr-accent-glow);
}

.btn--primary:hover {
  transform: translateY(-2px) scale(1.03);
  box-shadow: 0 10px 36px var(--clr-accent-glow);
}

.btn--primary:active {
  transform: translateY(0) scale(0.98);
}

/* btn--outline — modifier */
.btn--outline {
  background: transparent;
  color: var(--clr-accent-light);
  border: 1px solid var(--clr-accent-light);
  box-shadow: none;
}

.btn--outline:hover {
  background: var(--clr-surface-hover);
  border-color: var(--clr-accent-light);
  transform: translateY(-2px) scale(1.03);
  box-shadow: 0 6px 24px var(--clr-accent-glow);
}

.btn--outline:active {
  transform: translateY(0) scale(0.98);
}

/* ── 15. Section More (button row below a grid) ───────────────── */
.section-more {
  display: flex;
  justify-content: center;
  margin-top: var(--sp-4);
}

/* ── 16. Upload Card ──────────────────────────────────────────── */
.upload-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--card-radius);
  padding: var(--sp-5);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  box-shadow: var(--glass-shadow);
  max-width: 44rem;
  margin-bottom: var(--sp-4);
}

.upload-card__title {
  font-size: var(--fs-md);
  font-weight: 700;
  margin-bottom: var(--sp-4);
  color: var(--clr-text-primary);
}

/* ── 16. Status Message ───────────────────────────────────────── */
.status-msg {
  font-size: var(--fs-sm);
  min-height: 1.5rem;
  border-radius: var(--radius-sm);
  padding: 0.25rem 0;
}

.status-msg--success { color: var(--clr-success); }
.status-msg--error   { color: var(--clr-danger);  }

/* ── 17. Divider ──────────────────────────────────────────────── */
.divider {
  border: none;
  height: 1px;
  background: var(--clr-border);
  margin-block: var(--sp-6);
}

/* ── 18. Site Footer — multi-column, stacks below 768px ──────── */
.site-footer {
  border-top: 1px solid var(--clr-border);
  background: rgba(8, 12, 24, 0.65);
  padding-block: var(--sp-8) var(--sp-4);
  margin-top: auto;
}

.site-footer__inner {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-6);
  margin-bottom: var(--sp-6);
}

.site-footer__heading {
  font-size: var(--fs-xs);
  font-weight: 700;
  color: var(--clr-text-primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--sp-2);
}

.site-footer__desc {
  font-size: var(--fs-sm);
  color: var(--clr-text-secondary);
  line-height: 1.6;
}

.site-footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
}

.site-footer__link {
  font-size: var(--fs-sm);
  color: var(--clr-text-secondary);
  transition: color var(--dur-base) var(--ease-out-expo);
}

.site-footer__link:hover {
  color: var(--clr-accent-light);
}

.site-footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--sp-4);
  border-top: 1px solid var(--clr-border);
  font-size: var(--fs-xs);
  color: var(--clr-text-muted);
}

/* ── 19. Scrollbar (WebKit) ───────────────────────────────────── */
::-webkit-scrollbar             { width: 6px; height: 6px; }
::-webkit-scrollbar-track       { background: transparent; }
::-webkit-scrollbar-thumb       { background: rgba(124, 58, 237, 0.4); border-radius: var(--radius-pill); }
::-webkit-scrollbar-thumb:hover { background: rgba(124, 58, 237, 0.7); }

/* ── 20. Selection + Global Focus ────────────────────────────── */
::selection {
  background: rgba(124, 58, 237, 0.35);
  color: var(--clr-text-primary);
}

:focus-visible {
  outline: 2px solid var(--clr-accent-light);
  outline-offset: 3px;
}

/* ── 21. Watch Page Layout (YouTube-style) ────────────────────── */
.watch-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 22rem;
  gap: var(--sp-2);
  align-items: start;
}

.watch-layout__primary { min-width: 0; }

.watch-layout__secondary {
  position: sticky;
  top: calc(var(--nav-height) + var(--sp-2));
  max-height: calc(100dvh - var(--nav-height) - var(--sp-4));
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(124, 58, 237, 0.3) transparent;
}

/* ── 22. Video Meta (title + channel, below player) ───────────── */
.video-meta {
  padding-block: var(--sp-3);
  border-bottom: 1px solid var(--clr-border);
  margin-bottom: var(--sp-1);
}

.video-meta__title {
  font-size: var(--fs-lg);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.3;
  color: var(--clr-text-primary);
  margin-bottom: var(--sp-2);
}

/* ── 23. Channel Row ──────────────────────────────────────────── */
.channel-row {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: 0.375rem 0.75rem 0.375rem 0.375rem;
  border-radius: var(--radius-pill);
  transition:
    background var(--dur-base) var(--ease-out-expo),
    transform  var(--dur-base) var(--ease-spring);
}

.channel-row:hover {
  background: var(--clr-surface-hover);
  transform: translateX(2px);
}

.channel-row__avatar {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  object-fit: cover;
  background: var(--clr-surface-hover);
  flex-shrink: 0;
  border: 2px solid var(--clr-border);
  transition: border-color var(--dur-base) var(--ease-out-expo);
}

.channel-row:hover .channel-row__avatar {
  border-color: var(--clr-accent-light);
}

.channel-row__name {
  font-size: var(--fs-base);
  font-weight: 600;
  color: var(--clr-text-primary);
}

/* ── Channel profile (channel page banner) ────────────────────── */
.channel-profile {
  display: flex;
  align-items: center;
  gap: var(--sp-5);
  padding: var(--sp-2) 0 var(--sp-3);
  border-bottom: 1px solid rgba(255,255,255,0.07);
  margin-bottom: var(--sp-6);
}

.channel-profile__avatar {
  width: 6rem;
  height: 6rem;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--clr-accent);
  flex-shrink: 0;
  background: rgba(255,255,255,0.05);
}

.channel-profile__info {
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
}

.channel-profile__name {
  font-size: var(--fs-xl);
  font-weight: 800;
  color: var(--clr-text-primary);
  margin: 0;
}

.channel-profile__meta {
  font-size: var(--fs-sm);
  color: var(--clr-text-secondary);
  margin: 0;
}

@media (max-width: 480px) {
  .channel-profile {
    flex-direction: column;
    /* align-items: flex-start; */
    gap: var(--sp-3);
  }
}

/* ── 24. Related videos sidebar ───────────────────────────────── */
.related__heading {
  font-size: var(--fs-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--clr-text-secondary);
  margin-bottom: var(--sp-2);
  padding-bottom: var(--sp-1);
  border-bottom: 1px solid var(--clr-border);
}

.related-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

/* related-card: horizontal thumbnail + text info */
.related-card {
  display: grid;
  grid-template-columns: 8rem 1fr;
  gap: var(--sp-2);
  padding: var(--sp-1);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition:
    background  var(--dur-base) var(--ease-out-expo),
    transform   var(--dur-base) var(--ease-spring);
  outline-offset: 2px;
}

.related-card:hover,
.related-card:focus-visible {
  background: var(--clr-surface-hover);
  transform: translateX(4px);
}

.related-card:focus-visible {
  outline: 2px solid var(--clr-accent-light);
}

.related-card__thumb {
  width: 8rem;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: linear-gradient(145deg, #0f1526 0%, #1a1040 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: var(--clr-text-muted);
  flex-shrink: 0;
  transition: color var(--dur-base) var(--ease-out-expo);
}

.related-card:hover .related-card__thumb {
  color: var(--clr-accent-light);
}

.related-card__info {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  min-width: 0;
  padding-block: 0.125rem;
  margin-left: 5px;
}

.related-card__title {
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--clr-text-primary);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.related-card__channel {
  font-size: var(--fs-xs);
  color: var(--clr-text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ================================================================
   Media Queries — grouped at end for performance
   Base styles above target mobile (mobile-first).
   Queries below progressively enhance for larger viewports.
   ================================================================ */

/* ≥ 640px */
@media (min-width: 40rem) {
  .grid {
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 15rem), 1fr));
  }
}

/* < 768px — collapse footer grid, condense nav, stack watch layout */
@media (max-width: 48rem) {
  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: var(--sp-4);
  }

  .site-footer__bottom {
    flex-direction: column;
    gap: var(--sp-1);
    text-align: center;
  }

  .upload-card {
    padding: var(--sp-3);
  }

  .nav__list {
    gap: 0.25rem;
  }

  .grid {
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 13rem), 1fr));
    gap: var(--sp-2);
  }
}

/* < 960px — stack watch layout (player above, related below) */
@media (max-width: 60rem) {
  .watch-layout {
    grid-template-columns: 1fr;
  }

  .watch-layout__secondary {
    position: static;
    max-height: none;
    overflow-y: visible;
  }

  .related-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 16rem), 1fr));
    gap: var(--sp-2);
  }

  .related-card {
    grid-template-columns: 7rem 1fr;
  }
}

/* < 480px */
@media (max-width: 30rem) {
  .site-header__inner {
    padding-inline: var(--sp-2);
  }

  .nav__link {
    padding: 0.25rem 0.5rem;
  }

  .related-card {
    grid-template-columns: 1fr;
    gap: var(--sp-2);
    transform: none;
  }

  .related-card:hover,
  .related-card:focus-visible {
    transform: none;
  }

  .related-card__thumb {
    width: 100%;
  }

  .related-card__info {
    margin-left: 0;
    padding-inline: 0.125rem;
  }
}

#message {  
  margin-top: 15px;  
  font-weight: bold;  
  color: green;  
}  

/* Existing styles ... */  
  
.search-container {  
  margin-top: 10px;  
  margin-bottom: 20px;  
}  
  
.search-container input[type="text"] {  
  width: 300px;  
  padding: 8px;  
  border-radius: 4px;  
  border: 1px solid #ccc;  
  font-size: 1rem;  
}  
  
/* Video page layout */  
.video-page-main {  
  display: flex;  
  gap: 20px;  
  max-width: 1200px;  
  margin: 0 auto;  
  padding: 0 20px;  
}  
  
.video-section {  
  flex: 3;  
  display: flex;  
  flex-direction: column;  
  align-items: center;  
}  
  
.player-container iframe {  
  max-width: 100%;  
  border-radius: 6px;  
  box-shadow: 0 0 12px rgba(0,0,0,0.2);  
}  
  
.video-page-title {  
  margin-top: 10px;  
  font-size: 1.5rem;  
  font-weight: bold;  
  text-align: center;  
}  
  
/* Suggested videos on right */  
.suggested-section {  
  flex: 1;  
  background: #fff;  
  padding: 10px;  
  border-radius: 6px;  
  box-shadow: 0 0 6px rgba(0,0,0,0.1);  
  max-height: 500px;  
  overflow-y: auto;  
}  
  
.suggested-section h3 {  
  margin-top: 0;  
  margin-bottom: 10px;  
  font-size: 1.2rem;  
  border-bottom: 1px solid #ccc;  
  padding-bottom: 5px;  
}  
  
.suggested-video {  
  margin-bottom: 10px;  
}  
  
.suggested-video-title {  
  text-decoration: none;  
  color: #007bff;  
  font-weight: 600;  
}  
  
.suggested-video-title:hover {  
  text-decoration: underline;  
}