/* ==========================================================================
   INSTAGRAM VIDEO DOWNLOADER — SHARED STYLESHEET
   Table of contents:
   1. Fonts
   2. Variables (design tokens)
   3. Reset
   4. Base / Typography
   5. Layout (container, grid helpers)
   6. Components (header, nav, footer, breadcrumb, hero, cta, faq, cards, buttons, forms, downloader)
   7. Utilities
   8. Accessibility
   9. Responsive (tablet 768px, mobile below)
   ========================================================================== */

/* 1. FONTS
   ========================================================================== */
@import url('https://fonts.googleapis.com/css2?family=Sora:wght@600;700&family=Inter:wght@400;500;700&display=swap');

/* 2. VARIABLES
   ========================================================================== */
:root {
  /* Colors */
  --color-primary: #6C2BD9;
  --color-primary-dark: #5620AD;
  --color-secondary: #FF3E7F;
  --color-accent: #14C38E;
  --color-accent-dark: #0FA377;
  --color-bg: #FFFFFF;
  --color-surface: #F7F5FC;
  --color-surface-alt: #F1EEFA;
  --color-border: #E4E0F0;
  --color-text: #1D1B24;
  --color-text-muted: #635F72;
  --color-error: #E0334D;
  --color-white: #FFFFFF;

  /* Typography */
  --font-display: 'Sora', sans-serif;
  --font-body: 'Inter', sans-serif;
  --fs-sm: 14px;
  --fs-base: 16px;
  --fs-md: 18px;
  --fs-lg: 22px;
  --fs-xl: 28px;
  --fs-2xl: 36px;
  --fs-3xl: 48px;
  --fw-regular: 400;
  --fw-medium: 500;
  --fw-bold: 700;
  --lh-tight: 1.2;
  --lh-normal: 1.5;
  --lh-loose: 1.7;
  --ls-tight: -0.01em;

  /* Radius / Shadow */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 3px rgba(29, 27, 36, 0.08);
  --shadow-md: 0 4px 16px rgba(29, 27, 36, 0.10);

  /* Spacing scale — only these values are ever used */
  --sp-4: 4px;
  --sp-8: 8px;
  --sp-12: 12px;
  --sp-16: 16px;
  --sp-24: 24px;
  --sp-32: 32px;
  --sp-48: 48px;
  --sp-64: 64px;
  --sp-96: 96px;

  /* Layout */
  --container-max: 1200px;

  /* Motion */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

/* 3. RESET
   ========================================================================== */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, p, figure, blockquote, dl, dd, ul, ol { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, picture, svg { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button, input, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: none; }
table { border-collapse: collapse; width: 100%; }

@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;
  }
}

/* 4. BASE / TYPOGRAPHY
   ========================================================================== */
body {
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: var(--lh-normal);
  color: var(--color-text);
  background: var(--color-bg);
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: var(--fw-bold);
  line-height: var(--lh-tight);
  letter-spacing: var(--ls-tight);
  color: var(--color-text);
}

h1 { font-size: var(--fs-3xl); }
h2 { font-size: var(--fs-2xl); }
h3 { font-size: var(--fs-xl); }
h4 { font-size: var(--fs-lg); }

p { color: var(--color-text-muted); max-width: 68ch; }

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

/* 5. LAYOUT
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--sp-24);
}

.section { padding-block: var(--sp-64); }
.section--tight { padding-block: var(--sp-48); }

.grid {
  display: grid;
  gap: var(--sp-24);
}

.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

/* 6. COMPONENTS
   ========================================================================== */

/* --- Skip link --- */
.skip-link {
  position: absolute;
  left: var(--sp-16);
  top: -60px;
  background: var(--color-primary);
  color: var(--color-white);
  padding: var(--sp-12) var(--sp-16);
  border-radius: var(--radius-sm);
  z-index: 1000;
  transition: top var(--transition-fast);
}
.skip-link:focus { top: var(--sp-16); }

/* --- Header / Nav --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.site-header__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--sp-16);
}

.logo {
  font-family: var(--font-display);
  font-weight: var(--fw-bold);
  font-size: var(--fs-lg);
  color: var(--color-primary);
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--sp-32);
}

.nav__list {
  display: flex;
  align-items: center;
  gap: var(--sp-24);
}

.nav__link {
  font-weight: var(--fw-medium);
  color: var(--color-text);
  padding-block: var(--sp-4);
  border-bottom: 2px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.nav__link:hover,
.nav__link[aria-current="page"] {
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.nav__dropdown { position: relative; }

.nav__dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 260px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: var(--sp-8);
  margin-top: var(--sp-8);
}

.nav__dropdown:hover .nav__dropdown-menu,
.nav__dropdown:focus-within .nav__dropdown-menu {
  display: block;
}

.nav__dropdown-menu a {
  display: block;
  padding: var(--sp-8) var(--sp-12);
  border-radius: var(--radius-sm);
  font-size: var(--fs-sm);
}

.nav__dropdown-menu a:hover { background: var(--color-surface); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--sp-8);
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-text);
}

/* Mobile overlay menu */
.nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--color-bg);
  z-index: 200;
  padding: var(--sp-24);
}

.nav-overlay.is-open { display: block; }

.nav-overlay__close {
  margin-left: auto;
  display: block;
  font-size: var(--fs-xl);
}

.nav-overlay__list {
  display: flex;
  flex-direction: column;
  gap: var(--sp-24);
  margin-top: var(--sp-48);
  font-family: var(--font-display);
  font-size: var(--fs-lg);
}

/* --- Footer --- */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding-block: var(--sp-64) var(--sp-32);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-32);
}

.footer-col h4 {
  font-size: var(--fs-base);
  margin-bottom: var(--sp-16);
}

.footer-col ul { display: flex; flex-direction: column; gap: var(--sp-12); }

.footer-col a {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.footer-col a:hover { color: var(--color-primary); }

.footer-bottom {
  margin-top: var(--sp-48);
  padding-top: var(--sp-24);
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
}

.social-links { display: flex; gap: var(--sp-16); }

/* --- Breadcrumb --- */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--sp-8);
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  padding-block: var(--sp-16);
}

.breadcrumb a { color: var(--color-text-muted); }
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb__sep { color: var(--color-border); }
.breadcrumb__current { color: var(--color-text); font-weight: var(--fw-medium); }

/* --- Hero --- */
.hero {
  padding-block: var(--sp-64);
  background: linear-gradient(180deg, var(--color-surface) 0%, var(--color-bg) 100%);
  text-align: center;
}

.hero__content { max-width: 720px; margin-inline: auto; }

.hero h1 { margin-bottom: var(--sp-16); }

.hero__subtext {
  margin-inline: auto;
  margin-bottom: var(--sp-32);
  color: var(--color-text-muted);
  font-size: var(--fs-md);
}

.hero__badges {
  display: flex;
  justify-content: center;
  gap: var(--sp-16);
  margin-top: var(--sp-24);
  flex-wrap: wrap;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-8);
  padding: var(--sp-8) var(--sp-16);
  background: var(--color-surface-alt);
  border-radius: var(--radius-lg);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--color-text-muted);
}

/* --- Downloader form --- */
.downloader-form {
  display: flex;
  gap: var(--sp-12);
  max-width: 600px;
  margin-inline: auto;
}

.downloader-form__input {
  flex: 1;
  padding: var(--sp-16);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--fs-base);
}

.downloader-form__input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(108, 43, 217, 0.15);
}

.downloader-result {
  margin-top: var(--sp-32);
  padding: var(--sp-24);
  background: var(--color-surface);
  border-radius: var(--radius-md);
  display: none;
}

.downloader-result.is-visible { display: block; }

.downloader-status {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  margin-top: var(--sp-16);
  min-height: 1.2em;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-8);
  padding: var(--sp-16) var(--sp-32);
  border-radius: var(--radius-md);
  font-weight: var(--fw-bold);
  font-size: var(--fs-base);
  min-height: 44px;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

.btn--primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: var(--color-white);
}

.btn--primary:hover { box-shadow: var(--shadow-md); transform: translateY(-1px); }

.btn--secondary {
  background: transparent;
  color: var(--color-primary);
  border: 1.5px solid var(--color-primary);
}

.btn--secondary:hover { background: var(--color-surface-alt); }

.btn--download {
  background: var(--color-accent);
  color: var(--color-white);
}

.btn--download:hover { background: var(--color-accent-dark); }

/* --- Cards --- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--sp-24);
}

.card__icon {
  width: 48px;
  height: 48px;
  margin-bottom: var(--sp-16);
}

.card h3 { margin-bottom: var(--sp-8); font-size: var(--fs-md); }
.card p { font-size: var(--fs-sm); }

/* --- CTA section --- */
.cta {
  text-align: center;
  padding-block: var(--sp-64);
  background: var(--color-surface-alt);
  border-radius: var(--radius-lg);
}

.cta h2 { margin-bottom: var(--sp-12); }
.cta p { margin-inline: auto; margin-bottom: var(--sp-24); }
.cta__actions { display: flex; justify-content: center; gap: var(--sp-16); flex-wrap: wrap; }

/* --- FAQ --- */
.faq { max-width: 760px; margin-inline: auto; }

.faq__item {
  border-bottom: 1px solid var(--color-border);
  padding-block: var(--sp-16);
}

.faq__item summary {
  font-family: var(--font-display);
  font-weight: var(--fw-medium);
  font-size: var(--fs-md);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq__item summary::-webkit-details-marker { display: none; }

.faq__item summary::after {
  content: '+';
  font-size: var(--fs-lg);
  color: var(--color-primary);
}

.faq__item[open] summary::after { content: '−'; }

.faq__item p { margin-top: var(--sp-12); }

/* --- Forms (contact) --- */
.form-field { margin-bottom: var(--sp-24); }

.form-field label {
  display: block;
  font-weight: var(--fw-medium);
  margin-bottom: var(--sp-8);
  font-size: var(--fs-sm);
}

.form-field input,
.form-field textarea {
  width: 100%;
  padding: var(--sp-16);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.form-field input:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(108, 43, 217, 0.15);
}

/* --- Trust/author block --- */
.trust-block {
  display: flex;
  align-items: center;
  gap: var(--sp-16);
  padding: var(--sp-16);
  background: var(--color-surface);
  border-radius: var(--radius-md);
  margin-block: var(--sp-24);
}

.trust-block img { width: 40px; height: 40px; border-radius: 50%; }
.trust-block p { font-size: var(--fs-sm); margin: 0; }

/* 7. UTILITIES
   ========================================================================== */
.mt-8 { margin-top: var(--sp-8); }
.mt-16 { margin-top: var(--sp-16); }
.mt-24 { margin-top: var(--sp-24); }
.mt-32 { margin-top: var(--sp-32); }
.mb-8 { margin-bottom: var(--sp-8); }
.mb-16 { margin-bottom: var(--sp-16); }
.mb-24 { margin-bottom: var(--sp-24); }
.mb-32 { margin-bottom: var(--sp-32); }
.text-center { text-align: center; }
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* 8. ACCESSIBILITY
   ========================================================================== */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

/* 9. RESPONSIVE
   ========================================================================== */
@media (max-width: 768px) {
  .container { padding-inline: var(--sp-16); }
  .section { padding-block: var(--sp-48); }

  h1 { font-size: var(--fs-2xl); }
  h2 { font-size: var(--fs-xl); }

  .nav__list, .site-header .nav > .nav__list { display: none; }
  .nav-toggle { display: flex; }

  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }

  .downloader-form { flex-direction: column; }

  .footer-bottom { flex-direction: column; gap: var(--sp-16); text-align: center; }
}

@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .hero__badges { flex-direction: column; align-items: center; }
}