/* ═══════════════════════════════════════════════════════════
   ReelSnap — Design System
   Tokens → Reset → Layout → Components → Utilities
   ═══════════════════════════════════════════════════════════ */

/* ── 1. Design Tokens ──────────────────────────────────────── */
:root {
  /* Colors — Dark theme (default) */
  --color-bg:          #0a0a0f;
  --color-surface:     #13131a;
  --color-surface-2:   #1c1c28;
  --color-surface-3:   #252535;
  --color-border:      rgba(255,255,255,0.08);
  --color-border-hover:rgba(255,255,255,0.16);

  --color-text:        #f1f1f5;
  --color-text-2:      #9898b0;
  --color-text-3:      #5c5c75;

  --color-primary:     #a855f7;
  --color-primary-2:   #c084fc;
  --color-secondary:   #ec4899;
  --color-success:     #22c55e;
  --color-error:       #f87171;
  --color-warning:     #fbbf24;

  --gradient-primary:  linear-gradient(135deg, #a855f7, #ec4899);
  --gradient-glow:     radial-gradient(ellipse 60% 40% at 50% 0%, rgba(168,85,247,0.15), transparent);
  --gradient-hero-bg:  radial-gradient(ellipse 80% 50% at 50% -10%, rgba(168,85,247,0.12), transparent 70%);

  /* Typography */
  --font-sans:   "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono:   "JetBrains Mono", "Fira Code", monospace;

  --text-xs:    0.75rem;
  --text-sm:    0.875rem;
  --text-base:  1rem;
  --text-lg:    1.125rem;
  --text-xl:    1.25rem;
  --text-2xl:   1.5rem;
  --text-3xl:   1.875rem;
  --text-4xl:   2.25rem;
  --text-5xl:   3rem;
  --text-6xl:   3.75rem;

  --weight-normal:  400;
  --weight-medium:  500;
  --weight-semi:    600;
  --weight-bold:    700;
  --weight-black:   800;

  /* Spacing */
  --space-1:   0.25rem;
  --space-2:   0.5rem;
  --space-3:   0.75rem;
  --space-4:   1rem;
  --space-5:   1.25rem;
  --space-6:   1.5rem;
  --space-8:   2rem;
  --space-10:  2.5rem;
  --space-12:  3rem;
  --space-16:  4rem;
  --space-20:  5rem;
  --space-24:  6rem;

  /* Radius */
  --radius-sm:   6px;
  --radius-md:   10px;
  --radius-lg:   16px;
  --radius-xl:   24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm:   0 1px 3px rgba(0,0,0,0.3);
  --shadow-md:   0 4px 16px rgba(0,0,0,0.4);
  --shadow-lg:   0 8px 32px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 40px rgba(168,85,247,0.2);

  /* Transitions */
  --ease-out:  cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in:   cubic-bezier(0.4, 0, 1, 1);
  --duration:  200ms;
}

/* Light theme overrides */
:root[data-theme="light"] {
  --color-bg:          #f8f8fc;
  --color-surface:     #ffffff;
  --color-surface-2:   #f1f1f8;
  --color-surface-3:   #e8e8f0;
  --color-border:      rgba(0,0,0,0.08);
  --color-border-hover:rgba(0,0,0,0.16);

  --color-text:        #0f0f1a;
  --color-text-2:      #4a4a6a;
  --color-text-3:      #9090b0;

  --gradient-hero-bg:  radial-gradient(ellipse 80% 50% at 50% -10%, rgba(168,85,247,0.07), transparent 70%);
  --shadow-sm:   0 1px 3px rgba(0,0,0,0.08);
  --shadow-md:   0 4px 16px rgba(0,0,0,0.1);
  --shadow-lg:   0 8px 32px rgba(0,0,0,0.12);
}

/* ── 2. Reset ──────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  transition: background-color 0.3s var(--ease-out), color 0.3s var(--ease-out);
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input { font-family: inherit; }
ul { list-style: none; }

/* ── 3. Layout ─────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: 820px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

/* ── 4. Navbar ─────────────────────────────────────────────── */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  transition: background 0.3s;
}
:root[data-theme="light"] .navbar {
  background: rgba(248, 248, 252, 0.85);
}
.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.navbar__brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: var(--weight-bold);
  font-size: var(--text-lg);
  letter-spacing: -0.02em;
}
.navbar__brand-name {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.navbar__actions { display: flex; align-items: center; gap: var(--space-2); }

/* ── 5. Buttons ─────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: var(--weight-semi);
  line-height: 1;
  transition: all var(--duration) var(--ease-out);
  user-select: none;
  white-space: nowrap;
  border: 1.5px solid transparent;
}

.btn--primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 4px 20px rgba(168,85,247,0.35);
}
.btn--primary:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 6px 28px rgba(168,85,247,0.5);
}
.btn--primary:active:not(:disabled) { transform: translateY(0); }
.btn--primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}
.btn--primary.btn--loading {
  background: var(--gradient-primary);
  opacity: 0.75;
}

.btn--secondary {
  background: var(--color-surface-2);
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn--secondary:hover { background: var(--color-surface-3); border-color: var(--color-border-hover); }

.btn--ghost {
  color: var(--color-text-2);
  background: transparent;
  border-color: var(--color-border);
}
.btn--ghost:hover { color: var(--color-text); border-color: var(--color-border-hover); background: var(--color-surface-2); }

.btn--lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-base);
  font-weight: var(--weight-bold);
  width: 100%;
  border-radius: var(--radius-lg);
  margin-top: var(--space-4);
}

.btn-icon {
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-md);
  color: var(--color-text-2);
  transition: all var(--duration) var(--ease-out);
  border: 1.5px solid var(--color-border);
}
.btn-icon:hover { color: var(--color-text); background: var(--color-surface-2); border-color: var(--color-border-hover); }

/* ── 6. Hero Section ────────────────────────────────────────── */
.hero {
  padding: var(--space-20) 0 var(--space-12);
  background: var(--gradient-hero-bg);
  text-align: center;
}
.hero__inner { display: flex; flex-direction: column; align-items: center; gap: var(--space-6); }

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: rgba(168,85,247,0.12);
  color: var(--color-primary-2);
  border: 1px solid rgba(168,85,247,0.25);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: var(--weight-semi);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.badge svg { flex-shrink: 0; }

.hero__title {
  font-size: clamp(var(--text-3xl), 6vw, var(--text-6xl));
  font-weight: var(--weight-black);
  line-height: 1.1;
  letter-spacing: -0.04em;
  max-width: 700px;
}
.hero__title-highlight {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero__subtitle {
  color: var(--color-text-2);
  font-size: var(--text-lg);
  max-width: 480px;
  line-height: 1.7;
}

/* ── 7. Tabs ────────────────────────────────────────────────── */
.tabs {
  display: flex;
  gap: var(--space-2);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: var(--space-1);
  border-radius: var(--radius-full);
}
.tab {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-2);
  transition: all var(--duration) var(--ease-out);
  white-space: nowrap;
}
.tab:hover { color: var(--color-text); background: var(--color-surface-2); }
.tab--active {
  background: var(--gradient-primary);
  color: #fff;
  font-weight: var(--weight-semi);
}
.tab--active:hover { color: #fff; }

/* ── 8. Input Card ──────────────────────────────────────────── */
.input-card {
  width: 100%;
  max-width: 640px;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.input-wrapper {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4) var(--space-5);
  transition: border-color var(--duration) var(--ease-out), box-shadow var(--duration) var(--ease-out);
}
.input-wrapper:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(168,85,247,0.12);
}
.input-wrapper--error {
  border-color: var(--color-error);
  box-shadow: 0 0 0 4px rgba(248,113,113,0.1);
}
.input-icon { color: var(--color-text-3); flex-shrink: 0; display: flex; }
.url-input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  color: var(--color-text);
  font-size: var(--text-base);
  min-width: 0;
}
.url-input::placeholder { color: var(--color-text-3); }

.clear-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 22px; height: 22px;
  border-radius: var(--radius-full);
  color: var(--color-text-3);
  background: var(--color-surface-2);
  flex-shrink: 0;
  transition: all var(--duration);
}
.clear-btn:hover { color: var(--color-text); background: var(--color-surface-3); }

.input-error {
  font-size: var(--text-sm);
  color: var(--color-error);
  text-align: left;
  padding: 0 var(--space-2);
  animation: slideIn 0.15s var(--ease-out);
}

/* ── 9. Result Section ──────────────────────────────────────── */
.result-section {
  padding: var(--space-8) var(--space-4);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-6);
}
.result-card {
  width: 100%;
  max-width: 640px;
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  animation: fadeUp 0.3s var(--ease-out);
}

/* Loading skeleton */
.result-card--loading {
  display: flex;
  gap: var(--space-4);
  padding: var(--space-6);
}
.skeleton-thumb {
  width: 120px; height: 120px;
  border-radius: var(--radius-md);
  background: var(--color-surface-2);
  flex-shrink: 0;
  animation: pulse 1.5s ease-in-out infinite;
}
.skeleton-lines {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding-top: var(--space-2);
}
.skeleton-line {
  height: 14px;
  border-radius: var(--radius-full);
  background: var(--color-surface-2);
  animation: pulse 1.5s ease-in-out infinite;
}
.skeleton-line--wide   { width: 80%; }
.skeleton-line--medium { width: 55%; animation-delay: 0.1s; }
.skeleton-line--short  { width: 30%; animation-delay: 0.2s; }

.loading-label {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text-2);
  font-size: var(--text-sm);
}

/* Spinner */
.spinner {
  display: inline-block;
  width: 16px; height: 16px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: var(--radius-full);
  animation: spin 0.7s linear infinite;
}

/* Error card */
.result-card--error {
  padding: var(--space-10) var(--space-6);
  text-align: center;
  border-color: rgba(248,113,113,0.25);
  background: rgba(248,113,113,0.04);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
}
.error-icon { color: var(--color-error); }
.error-title { font-size: var(--text-xl); font-weight: var(--weight-bold); }
.error-message { color: var(--color-text-2); font-size: var(--text-sm); max-width: 380px; }

/* Success card */
.result-card--success {
  border-color: rgba(168,85,247,0.2);
}
.result-media {
  display: flex;
  gap: var(--space-5);
  padding: var(--space-6);
  border-bottom: 1px solid var(--color-border);
}
.result-thumb-wrap {
  width: 120px;
  height: 120px;
  border-radius: var(--radius-md);
  overflow: hidden;
  flex-shrink: 0;
  position: relative;
  background: var(--color-surface-2);
}
.result-thumb {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.3s var(--ease-out);
}
.result-thumb-wrap:hover .result-thumb { transform: scale(1.05); }
.result-thumb-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--duration);
}
.result-thumb-wrap:hover .result-thumb-overlay { opacity: 1; }

.result-meta {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  justify-content: center;
}
.result-title {
  font-size: var(--text-base);
  font-weight: var(--weight-semi);
  line-height: 1.4;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.result-tags { display: flex; flex-wrap: wrap; gap: var(--space-2); }

/* Tags */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px var(--space-3);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  color: var(--color-text-2);
  font-weight: var(--weight-medium);
}
.tag--success { color: var(--color-success); background: rgba(34,197,94,0.08); border-color: rgba(34,197,94,0.2); }

/* Formats */
.formats-section { padding: var(--space-5) var(--space-6); }
.formats-title {
  font-size: var(--text-sm);
  font-weight: var(--weight-semi);
  color: var(--color-text-2);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-4);
}
.formats-grid { display: flex; flex-direction: column; gap: var(--space-4); }
.format-group { display: flex; flex-direction: column; gap: var(--space-2); }
.format-group-label {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: var(--weight-semi);
  color: var(--color-text-3);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-1);
}
.format-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--duration) var(--ease-out);
  cursor: pointer;
}
.format-row:hover {
  border-color: var(--color-primary);
  background: rgba(168,85,247,0.06);
  transform: translateX(2px);
}
.format-quality {
  font-size: var(--text-sm);
  font-weight: var(--weight-semi);
  color: var(--color-text);
}
.format-ext {
  font-size: var(--text-xs);
  color: var(--color-text-3);
  font-family: var(--font-mono);
  background: var(--color-surface-3);
  padding: 1px 6px;
  border-radius: var(--radius-sm);
}
.format-dl-icon {
  margin-left: auto;
  color: var(--color-primary);
  display: flex;
  opacity: 0;
  transition: opacity var(--duration);
}
.format-row:hover .format-dl-icon { opacity: 1; }

.new-download-btn { margin-top: var(--space-2); }

/* ── 10. How To Use ─────────────────────────────────────────── */
.how-to-section {
  padding: var(--space-20) 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}
.section-header { text-align: center; margin-bottom: var(--space-12); }
.section-title {
  font-size: clamp(var(--text-2xl), 4vw, var(--text-3xl));
  font-weight: var(--weight-black);
  letter-spacing: -0.03em;
  margin-bottom: var(--space-3);
}
.section-subtitle { color: var(--color-text-2); font-size: var(--text-base); }

.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-6);
}
.step-card {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8) var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  transition: border-color var(--duration), transform var(--duration);
  position: relative;
}
.step-card:hover { border-color: var(--color-primary); transform: translateY(-3px); }
.step-number {
  font-size: var(--text-4xl);
  font-weight: var(--weight-black);
  letter-spacing: -0.04em;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  opacity: 0.4;
  line-height: 1;
}
.step-icon-wrap {
  color: var(--color-primary);
  display: flex;
}
.step-title { font-size: var(--text-base); font-weight: var(--weight-bold); }
.step-desc  { font-size: var(--text-sm); color: var(--color-text-2); line-height: 1.6; }

/* ── 11. FAQ ────────────────────────────────────────────────── */
.faq-section { padding: var(--space-20) 0; }
.faq-list { display: flex; flex-direction: column; gap: var(--space-3); }
.faq-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--duration);
}
.faq-item:has(.faq-question--open) { border-color: var(--color-primary); }

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-6);
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
  color: var(--color-text);
  text-align: left;
  gap: var(--space-4);
  transition: background var(--duration);
}
.faq-question:hover { background: var(--color-surface-2); }
.faq-chevron {
  flex-shrink: 0;
  color: var(--color-text-3);
  transition: transform 0.25s var(--ease-out);
  display: flex;
}
.faq-question--open .faq-chevron { transform: rotate(180deg); color: var(--color-primary); }

.faq-answer {
  padding: 0 var(--space-6) var(--space-5);
  font-size: var(--text-sm);
  color: var(--color-text-2);
  line-height: 1.7;
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-4);
}
.faq-answer[hidden] { display: none; }

/* ── 12. Footer ─────────────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-8) 0;
}
.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  text-align: center;
}
.footer__brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: var(--weight-bold);
  font-size: var(--text-sm);
}
.footer__copy        { font-size: var(--text-sm); color: var(--color-text-2); }
.footer__disclaimer  { font-size: var(--text-xs); color: var(--color-text-3); }

/* ── 13. Theme icon visibility ──────────────────────────────── */
.theme-icon { display: flex; align-items: center; justify-content: center; }
[data-theme="dark"]  .theme-icon--light { display: none; }
[data-theme="dark"]  .theme-icon--dark  { display: flex; }
[data-theme="light"] .theme-icon--dark  { display: none; }
[data-theme="light"] .theme-icon--light { display: flex; }

/* ── 14. Utilities ──────────────────────────────────────────── */
.hidden { display: none !important; }

/* ── 15. Animations ─────────────────────────────────────────── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes slideIn {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.4; }
}
@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ── 16. Responsive ─────────────────────────────────────────── */
@media (max-width: 600px) {
  .hero { padding: var(--space-12) 0 var(--space-8); }

  .tabs {
    flex-wrap: wrap;
    border-radius: var(--radius-lg);
    justify-content: center;
  }
  .tab { font-size: var(--text-xs); padding: var(--space-2) var(--space-3); }

  .btn--lg { padding: var(--space-4) var(--space-6); }

  .result-media { flex-direction: column; }
  .result-thumb-wrap { width: 100%; height: 180px; }

  .steps-grid { grid-template-columns: 1fr; }

  .faq-question { padding: var(--space-4) var(--space-4); font-size: var(--text-sm); }
  .faq-answer   { padding: 0 var(--space-4) var(--space-4); padding-top: var(--space-3); }
}