/* ============================================================
   DESIGN SYSTEM — ToolVerse Premium Platform
   Global CSS variables, reset, typography, utilities
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&display=swap');

/* ─── CSS CUSTOM PROPERTIES ─────────────────────────────── */
:root {
  /* Brand Colors */
  --primary:        #2563EB;
  --primary-light:  #3B82F6;
  --primary-dark:   #1D4ED8;
  --secondary:      #06B6D4;
  --secondary-light:#22D3EE;
  --accent:         #8B5CF6;
  --accent-light:   #A78BFA;

  /* Status Colors */
  --success:  #22C55E;
  --warning:  #F59E0B;
  --danger:   #EF4444;
  --info:     #06B6D4;

  /* Backgrounds */
  --bg:           #F8FAFC;
  --bg-dark:      #0F172A;
  --bg-card:      #FFFFFF;
  --bg-muted:     #F1F5F9;
  --bg-overlay:   rgba(15,23,42,0.6);

  /* Text */
  --text:         #0F172A;
  --text-muted:   #64748B;
  --text-light:   #94A3B8;
  --text-invert:  #FFFFFF;

  /* Borders */
  --border:       #E2E8F0;
  --border-focus: #2563EB;

  /* Shadows */
  --shadow-xs:  0 1px 2px rgba(0,0,0,0.05);
  --shadow-sm:  0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md:  0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -1px rgba(0,0,0,0.04);
  --shadow-lg:  0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -2px rgba(0,0,0,0.03);
  --shadow-xl:  0 20px 25px -5px rgba(0,0,0,0.08), 0 10px 10px -5px rgba(0,0,0,0.03);
  --shadow-2xl: 0 25px 50px -12px rgba(0,0,0,0.15);
  --shadow-glow:0 0 30px rgba(37,99,235,0.15);

  /* Radius */
  --radius-xs:  4px;
  --radius-sm:  8px;
  --radius-md:  12px;
  --radius-lg:  16px;
  --radius-xl:  20px;
  --radius-2xl: 24px;
  --radius-full:9999px;

  /* Spacing scale */
  --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;

  /* Typography */
  --font-sans:   'Inter', 'Plus Jakarta Sans', system-ui, sans-serif;
  --font-display:'Plus Jakarta Sans', 'Inter', system-ui, sans-serif;

  --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;
  --text-7xl:  4.5rem;

  /* Transitions */
  --transition-fast:   150ms cubic-bezier(0.4,0,0.2,1);
  --transition-base:   250ms cubic-bezier(0.4,0,0.2,1);
  --transition-slow:   400ms cubic-bezier(0.4,0,0.2,1);
  --transition-bounce: 300ms cubic-bezier(0.34,1.56,0.64,1);

  /* Z-index */
  --z-dropdown: 100;
  --z-sticky:   200;
  --z-modal:    300;
  --z-toast:    400;
  --z-tooltip:  500;

  /* Header height */
  --header-h: 70px;
}

/* ─── DARK MODE ──────────────────────────────────────────── */
[data-theme="dark"] {
  --bg:       #0F172A;
  --bg-dark:  #020617;
  --bg-card:  #1E293B;
  --bg-muted: #1E293B;
  --text:     #F1F5F9;
  --text-muted:#94A3B8;
  --text-light:#64748B;
  --border:   #334155;
  --shadow-md:0 4px 6px -1px rgba(0,0,0,0.3), 0 2px 4px -1px rgba(0,0,0,0.2);
  --shadow-lg:0 10px 15px -3px rgba(0,0,0,0.35), 0 4px 6px -2px rgba(0,0,0,0.2);
  --shadow-xl:0 20px 25px -5px rgba(0,0,0,0.4), 0 10px 10px -5px rgba(0,0,0,0.2);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  transition: background var(--transition-base), color var(--transition-base);
}

img, video { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; font-family: inherit; border: none; background: none; }
ul, ol { list-style: none; }
input, textarea, select { font-family: inherit; }
h1,h2,h3,h4,h5,h6 { font-family: var(--font-display); line-height: 1.2; }

/* ─── LAYOUT UTILITIES ───────────────────────────────────── */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}
.container-sm  { max-width: 860px; margin: 0 auto; padding: 0 var(--space-6); }
.container-lg  { max-width: 1440px; margin: 0 auto; padding: 0 var(--space-6); }

.flex         { display: flex; }
.flex-center  { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-col     { display: flex; flex-direction: column; }
.grid         { display: grid; }
.hidden       { display: none !important; }
.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; }

/* ─── TYPOGRAPHY ─────────────────────────────────────────── */
.text-xs    { font-size: var(--text-xs); }
.text-sm    { font-size: var(--text-sm); }
.text-base  { font-size: var(--text-base); }
.text-lg    { font-size: var(--text-lg); }
.text-xl    { font-size: var(--text-xl); }
.text-2xl   { font-size: var(--text-2xl); }
.text-3xl   { font-size: var(--text-3xl); }
.text-4xl   { font-size: var(--text-4xl); }
.text-5xl   { font-size: var(--text-5xl); }
.font-light  { font-weight: 300; }
.font-normal { font-weight: 400; }
.font-medium { font-weight: 500; }
.font-semi   { font-weight: 600; }
.font-bold   { font-weight: 700; }
.font-extra  { font-weight: 800; }
.font-black  { font-weight: 900; }
.text-center { text-align: center; }
.text-muted  { color: var(--text-muted); }

/* ─── BUTTONS ────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.625rem 1.375rem;
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.01em;
  transition: all var(--transition-base);
  white-space: nowrap;
  outline: none;
  position: relative;
  overflow: hidden;
}
.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0);
  transition: background var(--transition-fast);
}
.btn:hover::after  { background: rgba(255,255,255,0.08); }
.btn:active::after { background: rgba(0,0,0,0.06); }

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 14px rgba(37,99,235,0.35);
}
.btn-primary:hover {
  background: var(--primary-dark);
  box-shadow: 0 6px 20px rgba(37,99,235,0.45);
  transform: translateY(-1px);
}
.btn-secondary {
  background: var(--secondary);
  color: #fff;
  box-shadow: 0 4px 14px rgba(6,182,212,0.3);
}
.btn-secondary:hover {
  background: #0891B2;
  transform: translateY(-1px);
}
.btn-accent {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 14px rgba(139,92,246,0.3);
}
.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 1.5px solid var(--primary);
}
.btn-outline:hover {
  background: var(--primary);
  color: #fff;
  transform: translateY(-1px);
}
.btn-ghost {
  background: transparent;
  color: var(--text-muted);
}
.btn-ghost:hover { background: var(--bg-muted); color: var(--text); }
.btn-danger { background: var(--danger); color: #fff; }

.btn-lg { padding: 0.875rem 2rem; font-size: var(--text-base); }
.btn-sm { padding: 0.375rem 0.875rem; font-size: var(--text-xs); }
.btn-xl { padding: 1.1rem 2.5rem; font-size: var(--text-lg); }

.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none !important; }

/* Gradient button */
.btn-gradient {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  color: #fff;
  box-shadow: 0 4px 20px rgba(139,92,246,0.35);
}
.btn-gradient:hover {
  box-shadow: 0 8px 30px rgba(139,92,246,0.45);
  transform: translateY(-2px);
}

/* ─── CARDS ──────────────────────────────────────────────── */
.card {
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
  overflow: hidden;
}
.card:hover {
  box-shadow: var(--shadow-xl);
  transform: translateY(-3px);
  border-color: transparent;
}
.card-body { padding: var(--space-6); }
.card-sm .card-body { padding: var(--space-4); }

/* Glass card */
.card-glass {
  background: rgba(255,255,255,0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255,255,255,0.5);
  box-shadow: var(--shadow-lg);
}
[data-theme="dark"] .card-glass {
  background: rgba(30,41,59,0.7);
  border-color: rgba(255,255,255,0.08);
}

/* ─── BADGES ─────────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 10px;
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}
.badge-primary  { background: rgba(37,99,235,0.1);  color: var(--primary); }
.badge-success  { background: rgba(34,197,94,0.1);  color: var(--success); }
.badge-warning  { background: rgba(245,158,11,0.1); color: var(--warning); }
.badge-danger   { background: rgba(239,68,68,0.1);  color: var(--danger); }
.badge-accent   { background: rgba(139,92,246,0.1); color: var(--accent); }
.badge-new      { background: linear-gradient(135deg,#22C55E,#16A34A); color:#fff; }
.badge-hot      { background: linear-gradient(135deg,#EF4444,#DC2626); color:#fff; }
.badge-free     { background: linear-gradient(135deg,#06B6D4,#0891B2); color:#fff; }

/* ─── INPUTS ─────────────────────────────────────────────── */
.input {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  color: var(--text);
  transition: all var(--transition-fast);
  outline: none;
}
.input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.12);
}
.input-lg { padding: 1rem 1.25rem; font-size: var(--text-base); border-radius: var(--radius-lg); }

/* ─── DIVIDERS / SECTIONS ────────────────────────────────── */
.section {
  padding: var(--space-20) 0;
}
.section-sm {
  padding: var(--space-12) 0;
}
.section-header {
  text-align: center;
  margin-bottom: var(--space-12);
}
.section-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: var(--space-4);
  background: rgba(37,99,235,0.08);
  padding: 6px 14px;
  border-radius: var(--radius-full);
}
.section-title {
  font-size: clamp(var(--text-2xl), 4vw, var(--text-4xl));
  font-weight: 800;
  color: var(--text);
  margin-bottom: var(--space-4);
  line-height: 1.15;
}
.section-subtitle {
  font-size: var(--text-lg);
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ─── GRADIENTS ──────────────────────────────────────────── */
.gradient-text {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 50%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.gradient-bg {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
}
.gradient-bg-soft {
  background: linear-gradient(135deg, rgba(37,99,235,0.06) 0%, rgba(139,92,246,0.06) 100%);
}

/* ─── UPLOAD AREA ────────────────────────────────────────── */
.upload-area {
  border: 2px dashed var(--border);
  border-radius: var(--radius-2xl);
  padding: var(--space-16) var(--space-8);
  text-align: center;
  transition: all var(--transition-base);
  cursor: pointer;
  background: var(--bg-muted);
  position: relative;
  overflow: hidden;
}
.upload-area::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(37,99,235,0.03), rgba(139,92,246,0.03));
  opacity: 0;
  transition: opacity var(--transition-base);
}
.upload-area:hover, .upload-area.dragover {
  border-color: var(--primary);
  background: rgba(37,99,235,0.04);
  transform: scale(1.005);
}
.upload-area:hover::before, .upload-area.dragover::before { opacity: 1; }
.upload-area.dragover { border-style: solid; box-shadow: var(--shadow-glow); }

/* ─── PROGRESS BAR ───────────────────────────────────────── */
.progress {
  width: 100%;
  height: 6px;
  background: var(--bg-muted);
  border-radius: var(--radius-full);
  overflow: hidden;
}
.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: var(--radius-full);
  transition: width 0.3s ease;
  position: relative;
}
.progress-bar::after {
  content: '';
  position: absolute;
  top: 0; left: -100%; right: 0; bottom: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
  animation: shimmer 1.5s infinite;
}
@keyframes shimmer {
  0%  { transform: translateX(0); }
  100%{ transform: translateX(200%); }
}

/* ─── TOAST NOTIFICATIONS ────────────────────────────────── */
.toast-container {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  pointer-events: none;
}
.toast {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--border);
  min-width: 280px;
  max-width: 400px;
  pointer-events: all;
  animation: toastIn 0.35s var(--transition-bounce) forwards;
}
.toast.hide { animation: toastOut 0.25s ease forwards; }
@keyframes toastIn  {
  from { transform: translateX(120%); opacity: 0; }
  to   { transform: translateX(0);    opacity: 1; }
}
@keyframes toastOut {
  from { transform: translateX(0);    opacity: 1; }
  to   { transform: translateX(120%); opacity: 0; }
}
.toast-icon { width: 20px; height: 20px; flex-shrink: 0; }
.toast-msg  { font-size: var(--text-sm); font-weight: 500; color: var(--text); flex: 1; }
.toast-close { width: 18px; height: 18px; color: var(--text-light); cursor: pointer; flex-shrink: 0; }
.toast-success { border-left: 3px solid var(--success); }
.toast-error   { border-left: 3px solid var(--danger); }
.toast-warning { border-left: 3px solid var(--warning); }
.toast-info    { border-left: 3px solid var(--info); }

/* ─── MODAL ──────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg-overlay);
  backdrop-filter: blur(8px);
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}
.modal-overlay.active {
  opacity: 1;
  pointer-events: all;
}
.modal {
  background: var(--bg-card);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-2xl);
  max-width: 560px;
  width: 100%;
  transform: scale(0.95) translateY(20px);
  transition: transform var(--transition-bounce);
  overflow: hidden;
}
.modal-overlay.active .modal { transform: scale(1) translateY(0); }
.modal-header {
  padding: var(--space-6);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.modal-body    { padding: var(--space-6); }
.modal-footer  { padding: var(--space-4) var(--space-6); border-top: 1px solid var(--border); display:flex; gap: var(--space-3); justify-content: flex-end; }

/* ─── SKELETON LOADER ────────────────────────────────────── */
.skeleton {
  background: linear-gradient(90deg, var(--bg-muted) 25%, var(--border) 50%, var(--bg-muted) 75%);
  background-size: 200% 100%;
  animation: skeleton 1.5s infinite;
  border-radius: var(--radius-md);
}
@keyframes skeleton {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ─── BACK TO TOP ────────────────────────────────────────── */
.back-to-top {
  position: fixed;
  bottom: var(--space-8);
  right: var(--space-8);
  width: 44px;
  height: 44px;
  background: var(--primary);
  color: #fff;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  z-index: var(--z-sticky);
  transform: translateY(80px);
  opacity: 0;
  transition: all var(--transition-base);
}
.back-to-top.visible { transform: translateY(0); opacity: 1; }
.back-to-top:hover   { background: var(--primary-dark); transform: translateY(-2px); }

/* ─── ANIMATIONS ─────────────────────────────────────────── */
@keyframes fadeIn    { from{opacity:0} to{opacity:1} }
@keyframes fadeInUp  { from{opacity:0;transform:translateY(24px)} to{opacity:1;transform:translateY(0)} }
@keyframes fadeInDown{ from{opacity:0;transform:translateY(-24px)} to{opacity:1;transform:translateY(0)} }
@keyframes scaleIn   { from{opacity:0;transform:scale(0.9)} to{opacity:1;transform:scale(1)} }
@keyframes slideLeft { from{opacity:0;transform:translateX(24px)} to{opacity:1;transform:translateX(0)} }
@keyframes pulse     { 0%,100%{transform:scale(1)} 50%{transform:scale(1.05)} }
@keyframes float     { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-8px)} }
@keyframes spin      { from{transform:rotate(0)} to{transform:rotate(360deg)} }

.animate-fade-in    { animation: fadeIn    0.5s ease forwards; }
.animate-fade-up    { animation: fadeInUp  0.5s ease forwards; }
.animate-fade-down  { animation: fadeInDown 0.5s ease forwards; }
.animate-scale-in   { animation: scaleIn   0.4s var(--transition-bounce) forwards; }
.animate-pulse      { animation: pulse     2s infinite; }
.animate-float      { animation: float     3s ease-in-out infinite; }
.animate-spin       { animation: spin      1s linear infinite; }

/* Scroll-triggered animations */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ─── SCROLLBAR ──────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: var(--radius-full); }
::-webkit-scrollbar-thumb:hover { background: var(--text-light); }

/* ─── RESPONSIVE ─────────────────────────────────────────── */
@media (max-width: 1024px) {
  .container { padding: 0 var(--space-5); }
}
@media (max-width: 768px) {
  .container { padding: 0 var(--space-4); }
  .section    { padding: var(--space-12) 0; }
  .section-sm { padding: var(--space-8) 0; }
}
@media (max-width: 480px) {
  .container { padding: 0 var(--space-4); }
  .btn-xl    { padding: 0.875rem 1.75rem; font-size: var(--text-base); }
}