/* =====================================================================
   ImgVault — Design Kit v2 (SaaS · Hero-Centric · Aurora · Glass)
   Tokens đồng nhất: màu, spacing, radius, shadow, typography, motion
   Font: Poppins (heading) + Open Sans (body)
   ===================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Open+Sans:wght@300;400;500;600;700&family=Poppins:wght@400;500;600;700;800&display=swap');

/* ---------- Design Tokens ---------- */
:root {
  /* Brand */
  --color-primary:    #0F0F10;
  --color-secondary:  #3F3F46;
  --color-cta:        #D4AF37;
  --color-cta-2:      #F2D680;     /* gold sáng để làm gradient */
  --color-cta-hover:  #C49E2A;
  --color-bg:         #FBFBFD;
  --color-text:       #18181B;
  --color-muted:      #52525B;     /* zinc-600 — đủ contrast */
  --color-faint:      #71717A;     /* zinc-500 */
  --color-border:     #ECECEF;
  --color-border-2:   #E0E0E6;
  --color-surface:    #F4F4F6;
  --color-white:      #FFFFFF;
  --color-success:    #16A34A;
  --color-danger:     #DC2626;

  /* Glass */
  --glass-bg:     rgba(255, 255, 255, 0.72);
  --glass-strong: rgba(255, 255, 255, 0.88);
  --glass-blur:   20px;

  /* Aurora accent colors */
  --aura-1: rgba(212,175,55,0.22);
  --aura-2: rgba(99,102,241,0.14);
  --aura-3: rgba(236,72,153,0.10);

  /* Typography */
  --font-heading: 'Poppins', system-ui, sans-serif;
  --font-body:    'Open Sans', system-ui, sans-serif;

  /* Spacing (4px base) */
  --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;

  /* Radius */
  --radius-sm: 8px; --radius-md: 12px; --radius-lg: 16px;
  --radius-xl: 20px; --radius-2xl: 28px; --radius-full: 9999px;

  /* Shadow — soft, layered (premium) */
  --shadow-xs: 0 1px 2px rgba(15,15,16,0.05);
  --shadow-sm: 0 2px 6px rgba(15,15,16,0.06);
  --shadow-md: 0 8px 24px rgba(15,15,16,0.08);
  --shadow-lg: 0 20px 50px -12px rgba(15,15,16,0.18);
  --shadow-glow: 0 12px 32px -8px rgba(212,175,55,0.45);

  /* Motion */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --transition: 220ms var(--ease);

  --z-nav: 30; --z-toast: 50;
}

/* ---------- 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-body);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Aurora mesh background — chuyển động chậm, tạo chiều sâu */
body::before {
  content: ""; position: fixed; inset: -20% -10% auto -10%; height: 120vh; z-index: -1;
  background:
    radial-gradient(40vw 40vw at 15% 8%,  var(--aura-1), transparent 60%),
    radial-gradient(45vw 45vw at 88% 2%,  var(--aura-2), transparent 60%),
    radial-gradient(50vw 50vw at 60% 30%, var(--aura-3), transparent 60%);
  filter: saturate(1.1);
  animation: aura-float 16s ease-in-out infinite alternate;
  pointer-events: none;
}
@keyframes aura-float {
  0%   { transform: translate3d(0,0,0) scale(1); }
  100% { transform: translate3d(0,-3%,0) scale(1.08); }
}

h1, h2, h3, h4 { font-family: var(--font-heading); font-weight: 600; line-height: 1.18; color: var(--color-primary); letter-spacing: -0.01em; }
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
::selection { background: var(--color-cta); color: var(--color-primary); }

/* ---------- Layout ---------- */
.container { width: 100%; max-width: 1160px; margin: 0 auto; padding: 0 var(--space-6); }
.section { padding: var(--space-12) 0; }
[id] { scroll-margin-top: 96px; }

/* ---------- Navbar (floating glass) ---------- */
.navbar {
  position: sticky; top: var(--space-4); z-index: var(--z-nav);
  margin: var(--space-5) auto 0; max-width: 1160px; width: calc(100% - 2rem);
}
/* Dải nền full-width phía sau để nội dung không lòi ra hai bên khi cuộn */
.navbar::before {
  content: ""; position: absolute; z-index: -1;
  top: calc(var(--space-4) * -1); left: 50%; transform: translateX(-50%);
  width: 100vw; height: calc(100% + var(--space-5) + var(--space-4));
  background: rgba(251, 251, 253, 0.75);
  -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px);
  -webkit-mask-image: linear-gradient(to bottom, #000 60%, transparent);
  mask-image: linear-gradient(to bottom, #000 60%, transparent);
  pointer-events: none;
}
.navbar__inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--space-3) var(--space-3) var(--space-3) var(--space-5);
  background: rgba(255, 255, 255, 0.96);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(1.4);
  backdrop-filter: blur(var(--glass-blur)) saturate(1.4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-md);
}
.brand { display: flex; align-items: center; gap: var(--space-3); font-family: var(--font-heading); font-weight: 700; font-size: 1.125rem; }
.brand__mark {
  display: grid; place-items: center; width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--color-primary), #2b2b30);
  color: var(--color-cta); border-radius: 10px; box-shadow: var(--shadow-xs);
}
.brand__accent { color: var(--color-cta); }
.navbar__links { display: flex; align-items: center; gap: var(--space-2); }

/* ---------- Hero ---------- */
.hero { text-align: center; padding-top: var(--space-16); padding-bottom: var(--space-10); }
.hero h1 { font-weight: 800; font-size: clamp(2.25rem, 5.5vw, 3.75rem); letter-spacing: -0.03em; }
.hero h1 .accent {
  background: linear-gradient(120deg, var(--color-cta), var(--color-cta-hover));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.hero p { color: var(--color-muted); max-width: 54ch; margin: var(--space-5) auto 0; font-size: 1.0625rem; }
.badge {
  display: inline-flex; align-items: center; gap: var(--space-2);
  padding: var(--space-2) var(--space-4); margin-bottom: var(--space-6);
  background: var(--glass-strong);
  -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px);
  border: 1px solid var(--color-border-2); border-radius: var(--radius-full);
  font-size: 0.8125rem; font-weight: 600; color: var(--color-secondary);
  box-shadow: var(--shadow-xs);
}
.badge .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--color-success); box-shadow: 0 0 0 3px rgba(22,163,74,0.18); }

/* Feature pills dưới hero */
.feature-row { display: flex; flex-wrap: wrap; justify-content: center; gap: var(--space-3); margin-top: var(--space-8); }
.pill {
  display: inline-flex; align-items: center; gap: var(--space-2);
  padding: var(--space-2) var(--space-4); font-size: 0.8125rem; font-weight: 600; color: var(--color-secondary);
  background: var(--color-white); border: 1px solid var(--color-border); border-radius: var(--radius-full); box-shadow: var(--shadow-xs);
}
.pill svg { color: var(--color-cta); }

/* ---------- Card (glass, layered) ---------- */
.card {
  position: relative;
  background: var(--glass-strong);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(1.3);
  backdrop-filter: blur(var(--glass-blur)) saturate(1.3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-lg);
  padding: var(--space-6);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2);
  font-family: var(--font-heading); font-weight: 500; font-size: 0.9375rem;
  padding: var(--space-3) var(--space-5); border-radius: var(--radius-full);
  border: 1px solid transparent; cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition), transform var(--transition);
  white-space: nowrap; min-height: 44px;
}
.btn:focus-visible { outline: 3px solid rgba(212,175,55,0.45); outline-offset: 2px; }
.btn:active { transform: translateY(1px); }
.btn--primary { background: var(--color-primary); color: #fff; box-shadow: var(--shadow-sm); }
.btn--primary:hover { background: #000; box-shadow: var(--shadow-md); }
.btn--cta { background: linear-gradient(135deg, var(--color-cta-2), var(--color-cta)); color: var(--color-primary); box-shadow: var(--shadow-sm); }
.btn--cta:hover { box-shadow: var(--shadow-glow); }
.btn--ghost { background: transparent; color: var(--color-secondary); border-color: var(--color-border-2); }
.btn--ghost:hover { background: var(--color-surface); color: var(--color-primary); }
.btn--sm { padding: var(--space-2) var(--space-3); min-height: 38px; font-size: 0.8125rem; border-radius: var(--radius-md); }
.btn--danger { background: transparent; color: var(--color-danger); border-color: var(--color-border-2); }
.btn--danger:hover { background: #FEF2F2; border-color: #FCA5A5; }
.btn:disabled { opacity: 0.55; cursor: not-allowed; }

.icon { width: 20px; height: 20px; flex-shrink: 0; }
.icon--sm { width: 16px; height: 16px; }

/* ---------- Dropzone ---------- */
.dropzone {
  position: relative; display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: var(--space-4); text-align: center;
  padding: var(--space-16) var(--space-6);
  border: 2px dashed var(--color-border-2); border-radius: var(--radius-xl);
  background:
    linear-gradient(var(--color-surface), var(--color-surface)) padding-box,
    linear-gradient(135deg, rgba(212,175,55,0.2), transparent) border-box;
  cursor: pointer; overflow: hidden;
  transition: border-color var(--transition), background var(--transition), transform var(--transition);
}
.dropzone:hover { transform: translateY(-2px); }
.dropzone.is-dragover { border-color: var(--color-cta); background: rgba(212,175,55,0.07); }
.dropzone__icon {
  display: grid; place-items: center; width: 64px; height: 64px; border-radius: var(--radius-lg);
  background: linear-gradient(135deg, #fff, var(--color-surface)); color: var(--color-cta);
  box-shadow: var(--shadow-md); transition: transform var(--transition), box-shadow var(--transition);
}
.dropzone:hover .dropzone__icon { transform: translateY(-3px); box-shadow: var(--shadow-glow); }
.dropzone__icon .icon { width: 30px; height: 30px; }
.dropzone h3 { font-size: 1.1875rem; font-weight: 600; }
.dropzone__hint { color: var(--color-faint); font-size: 0.875rem; }
.dropzone input[type="file"] { display: none; }

/* ---------- Gallery ---------- */
.gallery {
  display: grid; gap: var(--space-5);
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  margin-top: var(--space-6);
}
.thumb {
  position: relative; border: 1px solid var(--color-border); border-radius: var(--radius-lg);
  overflow: hidden; background: var(--color-white); box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}
.thumb:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); border-color: var(--color-border-2); }
.thumb__img { aspect-ratio: 4 / 3; width: 100%; object-fit: cover; background: var(--color-surface); }
.thumb__body { padding: var(--space-4); }
.thumb__name { font-family: var(--font-heading); font-size: 0.8125rem; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.thumb__meta { font-size: 0.75rem; color: var(--color-faint); margin-top: 3px; }
.thumb__actions { display: flex; gap: var(--space-2); margin-top: var(--space-3); }
.thumb__actions .btn--cta { flex: 1; }

/* ---------- Result row (sau upload) ---------- */
.result {
  display: flex; align-items: center; gap: var(--space-4);
  padding: var(--space-3); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); background: var(--color-white); margin-top: var(--space-3);
  box-shadow: var(--shadow-xs);
}
.result__thumb { width: 56px; height: 56px; border-radius: var(--radius-md); object-fit: cover; flex-shrink: 0; background: var(--color-surface); }
.result__info { flex: 1; min-width: 0; }
.result__name { font-weight: 600; font-size: 0.875rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.result__link { display: flex; gap: var(--space-2); margin-top: var(--space-2); }
.result__link input {
  flex: 1; min-width: 0; padding: var(--space-2) var(--space-3); font-size: 0.8125rem;
  font-family: var(--font-body); border: 1px solid var(--color-border-2); border-radius: var(--radius-sm);
  background: var(--color-surface); color: var(--color-secondary);
}
.result__link input:focus-visible { outline: 2px solid rgba(212,175,55,0.45); }

/* ---------- Progress ---------- */
.progress { height: 6px; border-radius: var(--radius-full); background: var(--color-border-2); overflow: hidden; margin-top: var(--space-2); }
.progress__bar { height: 100%; width: 0; background: linear-gradient(90deg, var(--color-cta-2), var(--color-cta)); transition: width 150ms linear; }

/* ---------- Section heading ---------- */
.section-head { display: flex; align-items: flex-end; justify-content: space-between; gap: var(--space-4); margin-bottom: var(--space-5); flex-wrap: wrap; }
.section-head h2 { font-size: 1.5rem; font-weight: 700; }
.section-head .sub { color: var(--color-faint); font-size: 0.875rem; margin-top: 2px; }

/* ---------- Stats ---------- */
.stats { display: flex; gap: var(--space-6); }
.stat { text-align: right; }
.stat__num { font-family: var(--font-heading); font-weight: 700; font-size: 1.75rem; color: var(--color-primary); line-height: 1; }
.stat__label { font-size: 0.75rem; color: var(--color-faint); margin-top: var(--space-1); text-transform: uppercase; letter-spacing: 0.05em; }

.empty {
  text-align: center; color: var(--color-faint); padding: var(--space-16) var(--space-6);
  border: 1px dashed var(--color-border-2); border-radius: var(--radius-xl); background: var(--glass-bg);
}
.empty svg { width: 40px; height: 40px; color: var(--color-border-2); margin: 0 auto var(--space-3); }

/* ---------- Toast ---------- */
.toast-wrap { position: fixed; bottom: var(--space-6); right: var(--space-6); z-index: var(--z-toast); display: flex; flex-direction: column; gap: var(--space-2); }
.toast {
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-3) var(--space-5); border-radius: var(--radius-full);
  background: var(--color-primary); color: #fff; box-shadow: var(--shadow-lg);
  font-size: 0.875rem; font-weight: 500; animation: toast-in 280ms var(--ease);
}
.toast--success { background: var(--color-success); }
.toast--error { background: var(--color-danger); }
@keyframes toast-in { from { opacity: 0; transform: translateY(10px) scale(0.96); } to { opacity: 1; transform: none; } }

/* ---------- Footer ---------- */
.footer { text-align: center; color: var(--color-faint); font-size: 0.8125rem; padding: var(--space-12) 0 var(--space-16); }
.footer code { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: 6px; padding: 2px 6px; font-size: 0.75rem; }

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
  .navbar__links .btn span { display: none; }
  .hero { padding-top: var(--space-12); }
  .section-head { align-items: flex-start; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}