/* YTMP4 Design System — Photo/Video utility (ui-ux-pro-max)
   Style: Dark OLED + Glassmorphism | Pattern: Conversion-optimized
   Typography: Space Grotesk + DM Sans | Avoid: generic AI purple gradients */

@import url("https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700;1,9..40,400&family=Space+Grotesk:wght@500;600;700&display=swap");

:root {
  --bg: #070b14;
  --bg-elevated: #0d1220;
  --surface: rgba(255, 255, 255, 0.04);
  --surface-solid: #121a2b;
  --surface-2: rgba(255, 255, 255, 0.07);
  --surface-glass: rgba(13, 18, 32, 0.82);
  --text: #f1f5f9;
  --muted: #94a3b8;
  --border: rgba(148, 163, 184, 0.2);
  --ring: rgba(56, 189, 248, 0.38);
  --cyan: #38bdf8;
  --blue: #0ea5e9;
  --cta: #e11d48;
  --cta-hover: #f43f5e;
  --button: #e11d48;
  --ok: #10b981;
  --error: #f87171;
  --font-display: "Space Grotesk", system-ui, sans-serif;
  --font-body: "DM Sans", system-ui, sans-serif;
  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 18px;
  --shadow: 0 16px 40px rgba(0, 0, 0, 0.35);
  --transition: 200ms ease;
}

body.light {
  --bg: #f0f4fa;
  --bg-elevated: #ffffff;
  --surface: rgba(255, 255, 255, 0.92);
  --surface-solid: #ffffff;
  --surface-2: #eef2f9;
  --surface-glass: rgba(255, 255, 255, 0.92);
  --text: #0f172a;
  --muted: #64748b;
  --border: rgba(100, 116, 139, 0.22);
  --ring: rgba(14, 165, 233, 0.28);
  --cyan: #0284c7;
  --blue: #2563eb;
  --cta: #dc2626;
  --cta-hover: #ef4444;
  --button: #dc2626;
}

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  color: var(--text);
  background:
    radial-gradient(900px circle at 50% -120%, rgba(56, 189, 248, 0.14), transparent 50%),
    radial-gradient(600px circle at 100% 0%, rgba(225, 29, 72, 0.08), transparent 45%),
    linear-gradient(180deg, #0a101c 0%, var(--bg) 42%);
  min-height: 100vh;
  line-height: 1.55;
  transition: background var(--transition), color var(--transition);
  -webkit-tap-highlight-color: transparent;
}

body.light {
  background:
    radial-gradient(900px circle at 50% -80%, rgba(14, 165, 233, 0.12), transparent 50%),
    linear-gradient(180deg, #e8eef8 0%, var(--bg) 42%);
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  letter-spacing: -0.02em;
}

a {
  color: var(--cyan);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: var(--blue); }

button, input, select, textarea {
  font: inherit;
  -webkit-appearance: none;
  appearance: none;
}

button, [role="button"], .btn, .auth-link, .icon-btn {
  cursor: pointer;
}

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.top-line {
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--cyan), var(--cta), transparent);
  opacity: 0.85;
}

.topbar {
  position: relative;
  z-index: 9999;
  width: min(1100px, 94vw);
  margin: 0 auto;
  padding: 14px 0 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

main {
  position: relative;
  z-index: 1;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
  transition: transform var(--transition), opacity var(--transition);
}
.brand:hover { transform: translateY(-1px); opacity: 0.92; text-decoration: none; color: var(--text); }

.brand-logo {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  background: linear-gradient(140deg, var(--cta), #fb7185);
  position: relative;
  box-shadow: 0 8px 20px rgba(225, 29, 72, 0.35);
  flex-shrink: 0;
}
.brand-logo::after {
  content: "";
  position: absolute;
  left: 13px;
  top: 9px;
  width: 0;
  height: 0;
  border-left: 10px solid #fff;
  border-top: 7px solid transparent;
  border-bottom: 7px solid transparent;
}

.topnav-link {
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 600;
  text-decoration: none;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}
.topnav-link:hover { color: var(--text); background: var(--surface-2); text-decoration: none; }

/* Shared topbar controls (account + homepage) */
.top-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  position: relative;
  z-index: 2;
  flex-shrink: 0;
  margin-left: auto;
}
.topbar-icons {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: nowrap;
  flex-shrink: 0;
}
.lang-menu {
  position: relative;
  flex-shrink: 0;
}
.icon-btn {
  width: 38px;
  height: 38px;
  border-radius: 11px;
  border: 1px solid var(--border);
  background: rgba(13, 25, 54, 0.75);
  color: #9ec2ff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
  overflow: hidden;
  transition: transform var(--transition), border-color var(--transition), background var(--transition);
}
.icon-btn:hover {
  transform: translateY(-1px);
  border-color: #4e9dff;
  background: rgba(15, 31, 69, 0.85);
}
.icon-btn svg {
  width: 17px;
  height: 17px;
  max-width: 17px;
  max-height: 17px;
  flex-shrink: 0;
  display: block;
  stroke: currentColor;
  fill: none;
}
.lang-dropdown {
  position: absolute;
  right: 0;
  top: calc(100% + 8px);
  width: 210px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--surface-solid);
  box-shadow: 0 16px 32px rgba(2, 10, 28, 0.45);
  padding: 6px;
  opacity: 0;
  transform: translateY(-6px) scale(0.98);
  pointer-events: none;
  transition: opacity var(--transition), transform var(--transition);
  z-index: 10000;
}
.lang-dropdown.open {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}
.lang-option {
  width: 100%;
  border: 0;
  background: transparent;
  color: var(--text);
  padding: 9px 10px;
  border-radius: 9px;
  font-size: 0.9rem;
  text-align: left;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}
.lang-option:hover,
.lang-option.active {
  background: color-mix(in srgb, var(--button) 18%, transparent);
}
body.light .icon-btn {
  background: color-mix(in srgb, var(--surface-solid) 92%, transparent);
  color: var(--blue);
  border-color: var(--border);
}
body.light .icon-btn:hover {
  border-color: var(--cyan);
  background: color-mix(in srgb, var(--surface-2) 90%, transparent);
}
body.light .lang-dropdown {
  background: var(--surface-solid);
  box-shadow: 0 16px 32px rgba(15, 23, 42, 0.12);
}

/* Shared converter input */
.input {
  width: 100%;
  border: 1px solid transparent;
  background: var(--surface-solid);
  color: var(--text);
  border-radius: var(--radius-md);
  padding: 13px 16px;
  outline: none;
  font-size: 0.98rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.input::placeholder { color: var(--muted); }
.input:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 0 4px var(--ring);
}

.btn {
  border: 0;
  background: linear-gradient(135deg, var(--cta), var(--cta-hover));
  color: #fff;
  font-weight: 700;
  border-radius: var(--radius-md);
  min-width: 52px;
  min-height: 48px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition), filter var(--transition), box-shadow var(--transition);
  box-shadow: 0 8px 22px rgba(225, 29, 72, 0.28);
}
.btn:hover { transform: translateY(-1px); filter: brightness(1.05); }
.btn svg { width: 20px; height: 20px; stroke: currentColor; fill: none; }

/* Auth pages shared */
.auth-wrap {
  width: min(440px, 94vw);
  margin: 28px auto 48px;
  padding: 0 4px;
}

.auth-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding: 32px 28px 28px;
  box-shadow: var(--shadow);
}

.auth-card h1 {
  margin: 0 0 8px;
  font-size: 1.65rem;
  text-align: center;
}

.auth-sub {
  margin: 0 0 24px;
  text-align: center;
  color: var(--muted);
  font-size: 0.92rem;
}

.auth-field { margin-bottom: 16px; }
.auth-field label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.84rem;
  color: var(--muted);
  font-weight: 600;
}
.auth-field input {
  width: 100%;
  border: 1px solid var(--border);
  background: var(--surface-solid);
  color: var(--text);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  font-size: 0.96rem;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.auth-field input:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 0 4px var(--ring);
}

.auth-submit {
  width: 100%;
  margin-top: 8px;
  border: 0;
  border-radius: var(--radius-md);
  padding: 14px;
  font-weight: 700;
  font-size: 0.98rem;
  cursor: pointer;
  background: linear-gradient(135deg, var(--cta), var(--cta-hover));
  color: #fff;
  box-shadow: 0 8px 22px rgba(225, 29, 72, 0.3);
  transition: filter var(--transition), transform var(--transition);
}
.auth-submit:hover:not(:disabled) { filter: brightness(1.06); transform: translateY(-1px); }
.auth-submit:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }

.auth-msg {
  margin: 0 0 14px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  display: none;
}
.auth-msg.show { display: block; }
.auth-msg.error {
  background: rgba(248, 113, 113, 0.12);
  border: 1px solid rgba(248, 113, 113, 0.35);
  color: var(--error);
}
.auth-msg.success {
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.35);
  color: var(--ok);
}

.auth-links {
  margin-top: 20px;
  text-align: center;
  font-size: 0.88rem;
  color: var(--muted);
}
.auth-links p { margin: 8px 0; }

.auth-perks {
  margin: 0 0 20px;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  background: var(--surface-2);
  border: 1px solid var(--border);
  list-style: none;
}
.auth-perks li {
  padding: 5px 0 5px 22px;
  position: relative;
  font-size: 0.86rem;
  color: var(--text);
}
.auth-perks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--cyan), var(--ok));
}

.footer {
  border-top: 1px solid var(--border);
  margin-top: 32px;
  padding: 20px;
  text-align: center;
  color: var(--muted);
  font-size: 0.88rem;
}
.footer a { margin: 0 8px; color: var(--muted); }
.footer a:hover { color: var(--text); }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

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