/* =========================================================================
   Saveflow — stylesheet
   -------------------------------------------------------------------------
   Visual direction adapted from the "Chain App Dev" reference: the same
   blue→cyan gradient accent, Roboto type and pill-shaped buttons, rebuilt
   from scratch on a dark surface for Saveflow.
   ========================================================================= */

:root {
  /* Accent — the blue/cyan gradient that carries the brand */
  --accent: #4b8ef1;
  --accent-soft: #6ea6f5;
  --grad: linear-gradient(105deg, #5b68eb 0%, #28e1fd 100%);

  /* Dark surfaces, from page background upward */
  --bg: #0c1017;
  --surface: #141a24;
  --surface-2: #1b2331;
  --border: #253044;

  /* Text */
  --text: #eef2f8;
  --text-muted: #94a2b8;

  --danger: #f2555a;
  --success: #2ecc9b;

  --radius: 14px;
  --radius-pill: 999px;
  --header-h: 72px;
  --shadow: 0 18px 40px rgba(0, 0, 0, 0.45);
}

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

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 16px); }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'Roboto', system-ui, -apple-system, 'Segoe UI', sans-serif;
  font-weight: 400;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3 { margin: 0; line-height: 1.2; font-weight: 700; }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }

.container {
  width: 100%;
  max-width: 1120px;
  margin-inline: auto;
  padding-inline: 22px;
}

/* -------------------------------------------------------------------------
   Header
   ------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  background: rgba(12, 16, 23, 0.72);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s, background .3s;
}
/* `.is-scrolled` is toggled from script.js once the page moves */
.site-header.is-scrolled {
  border-bottom-color: var(--border);
  background: rgba(12, 16, 23, 0.92);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand { display: inline-flex; align-items: center; gap: 10px; }

/* The mark is a self-contained gradient SVG — no plate or tint behind it */
.brand-mark { width: 36px; height: 36px; flex-shrink: 0; }

.brand-text { font-size: 21px; font-weight: 700; letter-spacing: -0.3px; }
/* The reference highlights part of a heading with <em>; reused as brand accent */
.brand-text em,
.footer-brand em { font-style: normal; color: var(--accent-soft); }

.site-nav { display: flex; gap: 28px; }
.site-nav a {
  position: relative;
  font-size: 15px;
  color: var(--text-muted);
  transition: color .25s;
}
.site-nav a:hover { color: var(--text); }
.site-nav a::after {
  content: '';
  position: absolute;
  left: 0; bottom: -6px;
  width: 0; height: 2px;
  border-radius: 2px;
  background: var(--grad);
  transition: width .25s;
}
.site-nav a:hover::after { width: 100%; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px; height: 40px;
  padding: 0 9px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
}
.nav-toggle span {
  height: 2px;
  border-radius: 2px;
  background: var(--text);
  transition: transform .25s, opacity .25s;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* -------------------------------------------------------------------------
   Hero
   ------------------------------------------------------------------------- */
.hero {
  position: relative;
  padding: 84px 0 96px;
  overflow: hidden;
  text-align: center;
}

/* Soft radial wash behind the hero — the dark-mode stand-in for the
   reference template's photographic banner background. */
.hero-glow {
  position: absolute;
  top: -220px; left: 50%;
  width: min(1000px, 130vw);
  aspect-ratio: 1;
  transform: translateX(-50%);
  background: radial-gradient(circle,
              rgba(91, 104, 235, 0.30) 0%,
              rgba(40, 225, 253, 0.12) 42%,
              transparent 68%);
  pointer-events: none;
}

.hero-inner { position: relative; z-index: 1; }

.pill-tag {
  display: inline-block;
  padding: 6px 16px;
  margin-bottom: 24px;
  font-size: 13px;
  color: var(--accent-soft);
  background: rgba(75, 142, 241, 0.10);
  border: 1px solid rgba(75, 142, 241, 0.28);
  border-radius: var(--radius-pill);
}

.hero-title {
  font-size: clamp(2.3rem, 6vw, 3.9rem);
  font-weight: 900;
  letter-spacing: -1.5px;
}
.hero-title em {
  font-style: normal;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub {
  max-width: 620px;
  margin: 20px auto 0;
  color: var(--text-muted);
  font-size: 17px;
  font-weight: 300;
}

/* -------------------------------------------------------------------------
   Downloader form
   ------------------------------------------------------------------------- */
.downloader {
  display: flex;
  gap: 12px;
  max-width: 760px;
  margin: 38px auto 0;
}

.input-shell {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 6px 6px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  transition: border-color .25s, box-shadow .25s;
}
.input-shell:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(75, 142, 241, 0.14);
}

.input-icon { display: flex; color: var(--text-muted); flex-shrink: 0; }

#urlInput {
  flex: 1;
  min-width: 0;
  padding: 12px 0;
  background: none;
  border: 0;
  outline: none;
  color: var(--text);
  font: inherit;
  font-size: 15px;
}
#urlInput::placeholder { color: #61708a; }

.paste-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
  padding: 9px 15px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  color: var(--text-muted);
  font: inherit;
  font-size: 13.5px;
  cursor: pointer;
  transition: color .25s, border-color .25s, background .25s;
}
.paste-btn:hover { color: var(--text); border-color: var(--accent); }
.paste-btn.is-done { color: var(--success); border-color: var(--success); }

/* Gradient pill CTA — the reference's signature button, restyled for dark */
.btn-gradient {
  flex-shrink: 0;
  padding: 14px 34px;
  background: var(--grad);
  border: 0;
  border-radius: var(--radius-pill);
  color: #fff;
  font: inherit;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: .3px;
  cursor: pointer;
  transition: transform .25s, box-shadow .25s, opacity .25s;
}
.btn-gradient:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 12px 26px rgba(75, 142, 241, 0.35);
}
.btn-gradient:disabled { opacity: .55; cursor: not-allowed; }

/* -------------------------------------------------------------------------
   Platform badges
   ------------------------------------------------------------------------- */
.platforms {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-top: 26px;
}
.platforms li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 15px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  color: var(--text-muted);
  font-size: 13.5px;
}
.dot { width: 8px; height: 8px; border-radius: 50%; }
.dot-tiktok    { background: #25f4ee; }
.dot-instagram { background: linear-gradient(135deg, #f9ce34, #ee2a7b, #6228d7); }
.dot-facebook  { background: #1877f2; }
.dot-x         { background: #e7e9ea; }
.dot-threads   { background: #a855f7; }

/* -------------------------------------------------------------------------
   Error alert
   ------------------------------------------------------------------------- */
.alert {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  max-width: 760px;
  margin: 24px auto 0;
  padding: 14px 18px;
  text-align: left;
  background: rgba(242, 85, 90, 0.10);
  border: 1px solid rgba(242, 85, 90, 0.38);
  border-radius: var(--radius);
  color: #ffb9bb;
  animation: rise .3s ease both;
}
.alert svg { flex-shrink: 0; margin-top: 3px; }
.alert p { flex: 1; font-size: 14.5px; }
.alert-close {
  flex-shrink: 0;
  background: none;
  border: 0;
  color: inherit;
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
  opacity: .7;
}
.alert-close:hover { opacity: 1; }

/* -------------------------------------------------------------------------
   Loading state
   ------------------------------------------------------------------------- */
.skeleton {
  max-width: 760px;
  margin: 32px auto 0;
  padding: 22px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  animation: rise .3s ease both;
}

.spinner {
  width: 34px; height: 34px;
  margin: 0 auto 20px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-right-color: #28e1fd;
  border-radius: 50%;
  animation: spin .8s linear infinite;
}

.skeleton-body { display: flex; gap: 18px; text-align: left; }
.skeleton-thumb {
  flex-shrink: 0;
  width: 150px;
  aspect-ratio: 16 / 10;
  border-radius: 10px;
}
.skeleton-lines { flex: 1; display: flex; flex-direction: column; gap: 12px; padding-top: 4px; }
.line { height: 13px; border-radius: 6px; }
.w70 { width: 70%; } .w55 { width: 55%; } .w40 { width: 40%; }

.shimmer {
  background: linear-gradient(90deg, var(--surface-2) 25%, #26314400 37%, var(--surface-2) 63%);
  background-color: var(--surface-2);
  background-size: 400% 100%;
  animation: shimmer 1.4s ease infinite;
}

.skeleton-note {
  margin-top: 18px;
  color: var(--text-muted);
  font-size: 13.5px;
}

/* -------------------------------------------------------------------------
   Results
   ------------------------------------------------------------------------- */
.results {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 860px;
  margin: 34px auto 0;
  text-align: left;
}

.result-card {
  display: flex;
  gap: 20px;
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  animation: rise .35s ease both;
}

.result-thumb {
  position: relative;
  flex-shrink: 0;
  width: 190px;
  border-radius: 10px;
  overflow: hidden;
  background: var(--surface-2);
}
.result-thumb img { width: 100%; height: 100%; object-fit: cover; aspect-ratio: 16 / 10; }
.result-thumb.is-empty {
  display: grid;
  place-items: center;
  aspect-ratio: 16 / 10;
  color: var(--text-muted);
  font-size: 12px;
}

.result-duration {
  position: absolute;
  right: 8px; bottom: 8px;
  padding: 2px 8px;
  background: rgba(0, 0, 0, .75);
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}

.result-body { flex: 1; min-width: 0; }

.result-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}
.tag {
  padding: 3px 11px;
  background: rgba(75, 142, 241, .12);
  border: 1px solid rgba(75, 142, 241, .3);
  border-radius: var(--radius-pill);
  color: var(--accent-soft);
  font-size: 12px;
}
.tag-muted {
  background: var(--surface-2);
  border-color: var(--border);
  color: var(--text-muted);
}

.result-title {
  font-size: 17px;
  font-weight: 500;
  /* Captions can be long; clamp to two lines rather than blowing up the card */
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.result-uploader { margin-top: 4px; color: var(--text-muted); font-size: 13.5px; }

.format-list {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin-top: 16px;
}

.format-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  color: var(--text);
  font-size: 13.5px;
  transition: border-color .25s, transform .25s, background .25s;
}
.format-btn:hover {
  border-color: var(--accent);
  background: rgba(75, 142, 241, .12);
  transform: translateY(-1px);
}
.format-btn.is-primary { background: var(--grad); border-color: transparent; color: #fff; }
.format-btn small { color: inherit; opacity: .7; font-size: 12px; }

/* -------------------------------------------------------------------------
   Generic sections
   ------------------------------------------------------------------------- */
.section { padding: 86px 0; }
.section-alt { background: #0a0e14; border-block: 1px solid var(--border); }

.section-heading { max-width: 620px; margin: 0 auto 52px; text-align: center; }
.section-heading h2 { font-size: clamp(1.7rem, 3.6vw, 2.3rem); letter-spacing: -.6px; }
/* Reference pattern: an <em> inside the heading carries the accent colour */
.section-heading h2 em { font-style: normal; color: var(--accent-soft); }
.heading-rule {
  display: block;
  width: 46px; height: 3px;
  margin: 16px auto 0;
  border-radius: 3px;
  background: var(--grad);
}
.section-heading p { margin-top: 16px; color: var(--text-muted); font-weight: 300; }

/* Steps */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 22px;
}
.steps li {
  position: relative;
  padding: 30px 26px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.step-num {
  display: block;
  margin-bottom: 12px;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-size: 30px;
  font-weight: 900;
}
.steps h3 { font-size: 18px; }
.steps p { margin-top: 8px; color: var(--text-muted); font-size: 14.5px; font-weight: 300; }
.steps em { font-style: normal; color: var(--text); }

/* Feature cards */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 22px;
}
.feature-card {
  padding: 30px 26px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: transform .3s, border-color .3s;
}
.feature-card:hover { transform: translateY(-5px); border-color: var(--accent); }
.feature-icon {
  display: grid;
  place-items: center;
  width: 46px; height: 46px;
  margin-bottom: 18px;
  border-radius: 12px;
  background: rgba(75, 142, 241, .12);
  color: var(--accent-soft);
}
.feature-card h3 { font-size: 17px; }
.feature-card p { margin-top: 8px; color: var(--text-muted); font-size: 14.5px; font-weight: 300; }

/* -------------------------------------------------------------------------
   Footer
   ------------------------------------------------------------------------- */
.site-footer { padding: 40px 0; border-top: 1px solid var(--border); }
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: 19px;
  font-weight: 700;
}
.footer-note { color: var(--text-muted); font-size: 13.5px; }

/* -------------------------------------------------------------------------
   Animations
   ------------------------------------------------------------------------- */
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes shimmer { 0% { background-position: 100% 50%; } 100% { background-position: 0 50%; } }
@keyframes rise {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
}

/* -------------------------------------------------------------------------
   Responsive
   ------------------------------------------------------------------------- */
@media (max-width: 860px) {
  .nav-toggle { display: flex; }

  .site-nav {
    position: absolute;
    top: var(--header-h); left: 0; right: 0;
    flex-direction: column;
    gap: 0;
    padding: 0 22px;
    max-height: 0;
    overflow: hidden;
    background: rgba(12, 16, 23, .98);
    border-bottom: 1px solid transparent;
    transition: max-height .3s ease, padding .3s ease;
  }
  .site-nav.is-open {
    max-height: 320px;
    padding: 8px 22px 18px;
    border-bottom-color: var(--border);
  }
  .site-nav a { padding: 12px 0; }
  .site-nav a::after { display: none; }

  .downloader { flex-direction: column; }
  .btn-gradient { width: 100%; padding: 15px; }

  .result-card { flex-direction: column; }
  .result-thumb { width: 100%; }
}

@media (max-width: 520px) {
  .hero { padding: 56px 0 72px; }
  .section { padding: 62px 0; }
  .paste-btn span { display: none; }
  .paste-btn { padding: 10px 12px; }
  .skeleton-body { flex-direction: column; }
  .skeleton-thumb { width: 100%; }
  .format-btn { flex: 1 1 auto; justify-content: center; }
}