/* =========================================================
   EDUPIDIA — PDF TOOLS HUB
   Production-ready, responsive, accessible stylesheet
   ========================================================= */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 120px;
}

:root {
  --c-primary: #4F46E5;
  --c-primary-dark: #4338CA;
  --c-primary-light: #6366F1;
  --c-secondary: #7C3AED;
  --c-accent: #06B6D4;
  --c-success: #10B981;
  --c-warning: #F59E0B;
  --c-danger: #EF4444;

  --c-bg: #FFFFFF;
  --c-bg-alt: #F8FAFC;
  --c-bg-elev: #FFFFFF;
  --c-surface: #F1F5F9;
  --c-border: #E2E8F0;
  --c-text: #0F172A;
  --c-text-muted: #64748B;
  --c-text-soft: #94A3B8;

  --grad-primary: linear-gradient(135deg, #4F46E5 0%, #7C3AED 100%);
  --grad-soft: linear-gradient(135deg, #EEF2FF 0%, #F5F3FF 100%);
  --grad-hero: radial-gradient(1200px 600px at 10% -10%, #EEF2FF 0%, transparent 60%),
    radial-gradient(900px 500px at 90% 10%, #F5F3FF 0%, transparent 60%),
    linear-gradient(180deg, #FFFFFF 0%, #F8FAFC 100%);

  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.05);
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 6px 20px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 20px 40px rgba(79, 70, 229, 0.15);
  --shadow-xl: 0 30px 60px rgba(79, 70, 229, 0.22);

  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 16px;
  --r-xl: 24px;
  --r-full: 999px;

  --f-body: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --f-display: 'Poppins', 'Inter', sans-serif;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --t-fast: 160ms;
  --t-base: 260ms;
  --t-slow: 420ms;

  --header-h: 72px;
  --cat-h: 60px;
  --max-w: 1240px;
}

[data-theme="dark"] {
  --c-bg: #0B1020;
  --c-bg-alt: #0F172A;
  --c-bg-elev: #111A33;
  --c-surface: #1E293B;
  --c-border: #1E293B;
  --c-text: #F1F5F9;
  --c-text-muted: #94A3B8;
  --c-text-soft: #64748B;
  --grad-hero: radial-gradient(1200px 600px at 10% -10%, rgba(79, 70, 229, 0.18) 0%, transparent 60%),
    radial-gradient(900px 500px at 90% 10%, rgba(124, 58, 237, 0.15) 0%, transparent 60%),
    linear-gradient(180deg, #0B1020 0%, #0F172A 100%);
  --grad-soft: linear-gradient(135deg, #1E1B4B 0%, #2E1065 100%);
  --shadow-md: 0 6px 20px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.45);
}

body {
  font-family: var(--f-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: 0; background: none; color: inherit; }
ul { list-style: none; }
::selection { background: var(--c-primary); color: #fff; }

/* ---------- UTILITIES ---------- */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: 20px;
}

.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;
}

.skip-link {
  position: absolute;
  top: -40px;
  left: 16px;
  background: var(--c-primary);
  color: #fff;
  padding: 10px 16px;
  border-radius: var(--r-sm);
  z-index: 9999;
  transition: top var(--t-fast);
}

.skip-link:focus { top: 16px; }

.grad-text {
  background: var(--grad-primary);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: var(--grad-soft);
  color: var(--c-primary);
  border: 1px solid rgba(79, 70, 229, 0.15);
  border-radius: var(--r-full);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.eyebrow .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-success);
  box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.2);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.2); }
  50% { box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
}

.section { padding: clamp(56px, 8vw, 96px) 0; position: relative; }
.section-head { text-align: center; max-width: 720px; margin: 0 auto clamp(32px, 5vw, 56px); }
.section-title {
  font-family: var(--f-display);
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 800;
  line-height: 1.2;
  margin: 14px 0 12px;
  color: var(--c-text);
}
.section-sub {
  color: var(--c-text-muted);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.7;
}

/* ---------- BUTTONS ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 24px;
  border-radius: var(--r-full);
  font-weight: 600;
  font-size: 15px;
  transition: all var(--t-base) var(--ease);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}

.btn-primary {
  background: var(--grad-primary);
  color: #fff;
  box-shadow: 0 8px 20px rgba(79, 70, 229, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 30px rgba(79, 70, 229, 0.4);
}

.btn-ghost {
  background: transparent;
  color: var(--c-text);
  border: 1.5px solid var(--c-border);
}

.btn-ghost:hover {
  border-color: var(--c-primary);
  color: var(--c-primary);
  background: var(--grad-soft);
}

.ripple { position: relative; overflow: hidden; }
.ripple-effect {
  position: absolute;
  border-radius: 50%;
  transform: scale(0);
  animation: rippleAnim 600ms linear;
  background: rgba(255, 255, 255, 0.4);
  pointer-events: none;
}

@keyframes rippleAnim { to { transform: scale(4); opacity: 0; } }

/* ---------- HEADER ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: all var(--t-base) var(--ease);
}

[data-theme="dark"] .site-header { background: rgba(11, 16, 32, 0.85); }

.site-header.scrolled {
  border-bottom-color: var(--c-border);
  box-shadow: var(--shadow-sm);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--f-display);
  font-weight: 800;
  font-size: 22px;
  color: var(--c-text);
}

/* EDUPIDIA LOGO MARK */
.logo-mark {
  width: 38px;
  height: 38px;
  display: inline-grid;
  place-items: center;
  border-radius: 10px;
  background: var(--grad-primary);
  color: #fff;
  font-weight: 800;
  font-size: 20px;
  box-shadow: 0 6px 16px rgba(79, 70, 229, 0.35);
  transition: transform var(--t-base) var(--ease);
}

.logo:hover .logo-mark {
  transform: rotate(-8deg) scale(1.05);
}

.logo-text {
  background: var(--grad-primary);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.nav-desktop .nav-list { display: flex; gap: 6px; }

.nav-desktop a {
  padding: 10px 16px;
  border-radius: var(--r-sm);
  font-weight: 500;
  font-size: 15px;
  color: var(--c-text-muted);
  transition: all var(--t-fast) var(--ease);
  position: relative;
}

.nav-desktop a:hover {
  color: var(--c-primary);
  background: var(--grad-soft);
}

.nav-desktop a[aria-current="page"] {
  color: var(--c-primary);
  background: var(--grad-soft);
  font-weight: 600;
}

.nav-actions { display: flex; align-items: center; gap: 8px; }

.theme-toggle {
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--r-sm);
  color: var(--c-text-muted);
  transition: all var(--t-fast) var(--ease);
}

.theme-toggle:hover {
  color: var(--c-primary);
  background: var(--grad-soft);
}

.theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

/* HAMBURGER - SMOOTH X ANIMATION */
.hamburger {
  display: none;
  width: 42px;
  height: 42px;
  position: relative;
  border-radius: var(--r-sm);
  transition: background var(--t-fast);
}

.hamburger:hover { background: var(--grad-soft); }

.hamburger-line {
  position: absolute;
  left: 10px;
  right: 10px;
  height: 2.5px;
  background: var(--c-text);
  border-radius: 2px;
  transition: transform 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55),
              opacity 0.2s ease,
              top 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  transform-origin: center;
}

.hamburger-line:nth-child(1) { top: 14px; }
.hamburger-line:nth-child(2) { top: 20px; }
.hamburger-line:nth-child(3) { top: 26px; }

.hamburger[aria-expanded="true"] .hamburger-line:nth-child(1) {
  top: 20px;
  transform: rotate(45deg);
}

.hamburger[aria-expanded="true"] .hamburger-line:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.hamburger[aria-expanded="true"] .hamburger-line:nth-child(3) {
  top: 20px;
  transform: rotate(-45deg);
}

/* MOBILE MENU - SMOOTH SLIDE */
.mobile-menu {
  position: fixed;
  top: var(--header-h);
  left: 0;
  right: 0;
  background: var(--c-bg);
  border-bottom: 1px solid var(--c-border);
  box-shadow: var(--shadow-md);
  max-height: 0;
  opacity: 0;
  visibility: hidden;
  overflow: hidden;
  transition: max-height var(--t-slow) var(--ease),
              opacity var(--t-base) var(--ease),
              visibility var(--t-base);
  z-index: 99;
}

.mobile-menu[aria-hidden="false"] {
  max-height: 500px;
  opacity: 1;
  visibility: visible;
}

.mobile-list { padding: 12px 20px 20px; }

.mobile-list li {
  border-bottom: 1px solid var(--c-border);
  opacity: 0;
  transform: translateX(-20px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.mobile-list li:last-child { border-bottom: 0; }

.mobile-menu[aria-hidden="false"] .mobile-list li {
  opacity: 1;
  transform: translateX(0);
}

.mobile-menu[aria-hidden="false"] .mobile-list li:nth-child(1) { transition-delay: 0.05s; }
.mobile-menu[aria-hidden="false"] .mobile-list li:nth-child(2) { transition-delay: 0.1s; }
.mobile-menu[aria-hidden="false"] .mobile-list li:nth-child(3) { transition-delay: 0.15s; }
.mobile-menu[aria-hidden="false"] .mobile-list li:nth-child(4) { transition-delay: 0.2s; }
.mobile-menu[aria-hidden="false"] .mobile-list li:nth-child(5) { transition-delay: 0.25s; }
.mobile-menu[aria-hidden="false"] .mobile-list li:nth-child(6) { transition-delay: 0.3s; }

.mobile-list a {
  display: block;
  padding: 16px 4px;
  font-weight: 500;
  font-size: 16px;
  color: var(--c-text);
  transition: color var(--t-fast);
}

.mobile-list a:hover,
.mobile-list a[aria-current="page"] {
  color: var(--c-primary);
}

/* ---------- HERO ---------- */
.hero {
  position: relative;
  padding: clamp(60px, 9vw, 110px) 0 clamp(60px, 7vw, 90px);
  background: var(--grad-hero);
  overflow: hidden;
}

.hero-bg { position: absolute; inset: 0; pointer-events: none; }

.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.55;
  animation: float 14s ease-in-out infinite;
}

.blob-1 { width: 380px; height: 380px; background: #C7D2FE; top: -120px; left: -80px; }
.blob-2 { width: 320px; height: 320px; background: #DDD6FE; top: 10%; right: -80px; animation-delay: -4s; }
.blob-3 { width: 260px; height: 260px; background: #A5F3FC; bottom: -80px; left: 30%; animation-delay: -8s; }

[data-theme="dark"] .blob { opacity: 0.25; }

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(30px, -30px) scale(1.05); }
  66% { transform: translate(-20px, 20px) scale(0.95); }
}

.hero-inner { position: relative; text-align: center; max-width: 860px; margin: 0 auto; }

.hero-title {
  font-family: var(--f-display);
  font-size: clamp(34px, 6vw, 64px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 18px 0 18px;
}

.hero-sub {
  font-size: clamp(16px, 1.7vw, 19px);
  color: var(--c-text-muted);
  max-width: 680px;
  margin: 0 auto 32px;
  line-height: 1.7;
}

.hero-search { max-width: 620px; margin: 0 auto 36px; }

.search-wrap {
  position: relative;
  display: flex;
  align-items: center;
  background: var(--c-bg-elev);
  border: 1.5px solid var(--c-border);
  border-radius: var(--r-full);
  padding: 6px 8px 6px 20px;
  box-shadow: var(--shadow-sm);
  transition: all var(--t-base) var(--ease);
}

.search-wrap:focus-within {
  border-color: var(--c-primary);
  box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.12), var(--shadow-md);
}

.search-icon { color: var(--c-text-soft); flex-shrink: 0; }

.search-wrap input {
  flex: 1;
  border: 0;
  outline: 0;
  background: transparent;
  padding: 12px 12px;
  font-size: 15px;
  color: var(--c-text);
  font-family: inherit;
}

.search-wrap input::placeholder { color: var(--c-text-soft); }

.search-wrap kbd {
  font-family: inherit;
  font-size: 12px;
  font-weight: 600;
  padding: 4px 8px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 6px;
  color: var(--c-text-muted);
  margin-right: 4px;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px 28px;
  margin-bottom: 36px;
}

.hero-stats li {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 12px 18px;
  background: var(--c-bg-elev);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  min-width: 110px;
  box-shadow: var(--shadow-xs);
  transition: transform var(--t-base) var(--ease);
}

.hero-stats li:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.hero-stats strong {
  font-family: var(--f-display);
  font-size: 22px;
  font-weight: 800;
  background: var(--grad-primary);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-stats span { font-size: 13px; color: var(--c-text-muted); margin-top: 2px; }
.hero-ctas { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* ---------- POPULAR TOOLS ---------- */
.popular-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; }

.popular-card {
  position: relative;
  padding: 32px 28px;
  background: var(--c-bg-elev);
  border: 1.5px solid var(--c-border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--t-base) var(--ease);
  overflow: hidden;
}

.popular-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--grad-soft);
  opacity: 0;
  transition: opacity var(--t-base);
  z-index: 0;
}

.popular-card > * { position: relative; z-index: 1; }

.popular-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(79, 70, 229, 0.3);
}

.popular-card:hover::before { opacity: 1; }
.popular-card.featured { border-color: rgba(79, 70, 229, 0.2); }

.popular-icon {
  width: 72px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--grad-soft);
  border-radius: var(--r-md);
  margin-bottom: 18px;
}

.popular-card h3 { font-family: var(--f-display); font-size: 22px; font-weight: 700; margin-bottom: 10px; }
.popular-card p { color: var(--c-text-muted); font-size: 15px; line-height: 1.6; margin-bottom: 16px; }
.popular-meta { display: flex; gap: 14px; font-size: 13px; color: var(--c-text-muted); margin-bottom: 18px; }

.badge {
  position: absolute;
  top: 18px;
  right: 18px;
  padding: 5px 12px;
  border-radius: var(--r-full);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.badge-ready { background: rgba(16, 185, 129, 0.12); color: var(--c-success); border: 1px solid rgba(16, 185, 129, 0.25); }
.badge-soon { background: rgba(245, 158, 11, 0.12); color: var(--c-warning); border: 1px solid rgba(245, 158, 11, 0.25); }

/* ---------- CATEGORY NAV ---------- */
.cat-nav {
  position: sticky;
  top: var(--header-h);
  z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--c-border);
}

[data-theme="dark"] .cat-nav { background: rgba(11, 16, 32, 0.92); }

.cat-list {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  padding: 10px 0;
  scrollbar-width: none;
}

.cat-list::-webkit-scrollbar { display: none; }

.cat-link {
  flex-shrink: 0;
  padding: 9px 18px;
  border-radius: var(--r-full);
  font-size: 14px;
  font-weight: 600;
  color: var(--c-text-muted);
  background: transparent;
  border: 1.5px solid transparent;
  transition: all var(--t-fast) var(--ease);
  white-space: nowrap;
}

.cat-link:hover { color: var(--c-primary); background: var(--grad-soft); }

.cat-link.active {
  color: #fff;
  background: var(--grad-primary);
  border-color: transparent;
  box-shadow: 0 6px 16px rgba(79, 70, 229, 0.3);
}

/* ---------- TOOL CARDS ---------- */
.tools-section { background: var(--c-bg-alt); }
.tool-category { margin-bottom: 56px; }
.tool-category:last-child { margin-bottom: 0; }

.cat-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px dashed var(--c-border);
}

.cat-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--grad-primary);
  color: #fff;
  border-radius: var(--r-md);
  box-shadow: 0 8px 18px rgba(79, 70, 229, 0.25);
  flex-shrink: 0;
}

.cat-header h3 { font-family: var(--f-display); font-size: clamp(20px, 2.4vw, 26px); font-weight: 700; margin-bottom: 4px; }
.cat-header p { color: var(--c-text-muted); font-size: 14px; }

.tools-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 18px; }

.tool-card {
  position: relative;
  padding: 24px 22px 22px;
  background: var(--c-bg-elev);
  border: 1.5px solid var(--c-border);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-xs);
  transition: all var(--t-base) var(--ease);
  display: flex;
  flex-direction: column;
}

.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(79, 70, 229, 0.25);
}

.tool-card.coming-soon { opacity: 0.92; }
.tool-card.coming-soon:hover { transform: translateY(-2px); }

.tool-icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--grad-soft);
  color: var(--c-primary);
  border-radius: var(--r-sm);
  margin-bottom: 14px;
  transition: transform var(--t-base) var(--ease);
}

.tool-card:hover .tool-icon { transform: scale(1.08) rotate(-4deg); }

.tool-card h4 { font-family: var(--f-display); font-size: 17px; font-weight: 700; margin-bottom: 6px; }

.tool-card p {
  color: var(--c-text-muted);
  font-size: 14px;
  line-height: 1.55;
  margin-bottom: 14px;
  flex-grow: 1;
}

.tool-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--c-primary);
  transition: all var(--t-base) var(--ease);
  margin-top: auto;
}

.tool-link:hover { color: var(--c-primary-dark); transform: translateX(4px); }

.tool-link.disabled {
  color: var(--c-text-soft);
  cursor: not-allowed;
  pointer-events: none;
}

.empty-state { text-align: center; padding: 60px 20px; color: var(--c-text-muted); }
.empty-state[hidden] { display: none; }
.empty-icon { color: var(--c-text-soft); margin-bottom: 16px; }
.empty-state h3 { font-size: 20px; margin-bottom: 8px; color: var(--c-text); }

/* ---------- ABOUT ---------- */
.about-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: 48px; align-items: start; }
.about-text h3 { font-family: var(--f-display); font-size: 20px; font-weight: 700; margin: 24px 0 10px; color: var(--c-text); }
.about-text p { color: var(--c-text-muted); font-size: 16px; line-height: 1.8; margin-bottom: 14px; }
.about-text a { color: var(--c-primary); font-weight: 600; }
.about-text a:hover { text-decoration: underline; }

.about-card {
  background: var(--grad-soft);
  border: 1px solid rgba(79, 70, 229, 0.15);
  border-radius: var(--r-lg);
  padding: 32px 28px;
  position: sticky;
  top: calc(var(--header-h) + var(--cat-h) + 20px);
}

.about-card h3 { font-family: var(--f-display); font-size: 20px; font-weight: 700; margin-bottom: 18px; }

.highlights li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px dashed rgba(79, 70, 229, 0.15);
  font-size: 15px;
  color: var(--c-text);
}

.highlights li:last-child { border-bottom: 0; }

.check {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--c-success);
  color: #fff;
  border-radius: 50%;
  font-size: 12px;
  font-weight: 700;
}

/* ---------- HOW TO ---------- */
.howto { background: var(--c-bg-alt); }
.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 20px; counter-reset: step; }

.step {
  background: var(--c-bg-elev);
  border: 1.5px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: 28px 22px;
  text-align: center;
  position: relative;
  transition: all var(--t-base) var(--ease);
}

.step:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: rgba(79, 70, 229, 0.25); }

.step-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--grad-primary);
  color: #fff;
  border-radius: var(--r-md);
  box-shadow: 0 10px 24px rgba(79, 70, 229, 0.3);
}

.step h3 { font-family: var(--f-display); font-size: 17px; font-weight: 700; margin-bottom: 6px; }
.step p { color: var(--c-text-muted); font-size: 14px; line-height: 1.6; }

/* ---------- FEATURES ---------- */
.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; }

.feature {
  background: var(--c-bg-elev);
  border: 1.5px solid var(--c-border);
  border-radius: var(--r-md);
  padding: 26px 22px;
  transition: all var(--t-base) var(--ease);
}

.feature:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: rgba(79, 70, 229, 0.25); }

.feature-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--grad-soft);
  color: var(--c-primary);
  border-radius: var(--r-sm);
  margin-bottom: 14px;
}

.feature h3 { font-family: var(--f-display); font-size: 17px; font-weight: 700; margin-bottom: 6px; }
.feature p { color: var(--c-text-muted); font-size: 14px; line-height: 1.6; }

/* ---------- FAQ ---------- */
.faq-list { max-width: 820px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }

.faq-item {
  background: var(--c-bg-elev);
  border: 1.5px solid var(--c-border);
  border-radius: var(--r-md);
  overflow: hidden;
  transition: all var(--t-base) var(--ease);
}

.faq-item[open] { border-color: rgba(79, 70, 229, 0.3); box-shadow: var(--shadow-sm); }

.faq-item summary {
  padding: 18px 22px;
  font-weight: 600;
  font-size: 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  list-style: none;
  transition: color var(--t-fast);
}

.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary:hover { color: var(--c-primary); }
.faq-item summary a { color: var(--c-primary); font-weight: 600; }
.faq-item summary a:hover { text-decoration: underline; }

.faq-icon {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  position: relative;
  transition: transform var(--t-base) var(--ease);
}

.faq-icon::before, .faq-icon::after {
  content: "";
  position: absolute;
  background: var(--c-primary);
  border-radius: 2px;
  top: 50%;
  left: 50%;
  transition: transform var(--t-base) var(--ease);
}

.faq-icon::before { width: 14px; height: 2px; transform: translate(-50%, -50%); }
.faq-icon::after { width: 2px; height: 14px; transform: translate(-50%, -50%); }
.faq-item[open] .faq-icon::after { transform: translate(-50%, -50%) rotate(90deg); }
.faq-item p { padding: 0 22px 20px; color: var(--c-text-muted); line-height: 1.7; font-size: 15px; }

/* ---------- EXPLORE MORE ---------- */
.explore { background: var(--c-bg-alt); }
.explore-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 18px; margin-bottom: 32px; }

.explore-card {
  position: relative;
  background: var(--c-bg-elev);
  border: 1.5px solid var(--c-border);
  border-radius: var(--r-md);
  padding: 24px 20px;
  text-align: center;
  transition: all var(--t-base) var(--ease);
}

.explore-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(79, 70, 229, 0.25);
}

.explore-card.explore-coming-soon {
  opacity: 0.85;
  cursor: pointer;
}

.explore-card.explore-coming-soon:hover {
  transform: translateY(-2px);
  border-color: var(--c-warning);
  box-shadow: 0 6px 20px rgba(245, 158, 11, 0.15);
}

.explore-badge {
  position: absolute;
  top: 12px;
  right: 12px;
  padding: 4px 10px;
  background: rgba(245, 158, 11, 0.12);
  color: var(--c-warning);
  border: 1px solid rgba(245, 158, 11, 0.25);
  border-radius: var(--r-full);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.explore-icon { font-size: 32px; margin-bottom: 10px; }
.explore-card h3 { font-family: var(--f-display); font-size: 16px; font-weight: 700; margin-bottom: 4px; }
.explore-card p { color: var(--c-text-muted); font-size: 13px; }

.coming-soon-banner {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 28px;
  background: var(--grad-primary);
  color: #fff;
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-lg);
  flex-wrap: wrap;
}

.csb-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.18);
  border-radius: var(--r-md);
  font-size: 28px;
  flex-shrink: 0;
}

.coming-soon-banner h3 { font-family: var(--f-display); font-size: 20px; margin-bottom: 4px; }
.coming-soon-banner p { opacity: 0.9; font-size: 14px; margin: 0; flex: 1; min-width: 200px; }

.coming-soon-banner .btn-ghost { color: #fff; border-color: rgba(255, 255, 255, 0.4); }

.coming-soon-banner .btn-ghost:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: #fff;
  color: #fff;
}

/* ---------- BACK TO TOP ---------- */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 46px;
  height: 46px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--grad-primary);
  color: #fff;
  border-radius: 50%;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--t-base) var(--ease);
  z-index: 80;
}

.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

/* ---------- REVEAL ANIMATIONS ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--t-slow) var(--ease), transform var(--t-slow) var(--ease);
}

.reveal.in-view { opacity: 1; transform: translateY(0); }

/* ---------- RESPONSIVE ---------- */
@media (max-width: 1024px) {
  .about-grid { grid-template-columns: 1fr; gap: 36px; }
  .about-card { position: static; }
}

@media (max-width: 768px) {
  :root { --header-h: 64px; }
  .nav-desktop { display: none; }
  .hamburger { display: block; }
  .hero-stats li { min-width: 90px; padding: 10px 12px; }
  .hero-stats strong { font-size: 18px; }
  .hero-stats span { font-size: 12px; }
  .tools-grid { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }
  .coming-soon-banner { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .container { padding-inline: 16px; }
  .hero-title { font-size: 34px; }
  .section-title { font-size: 26px; }
  .btn { padding: 12px 20px; font-size: 14px; }
  .hero-ctas { flex-direction: column; width: 100%; }
  .hero-ctas .btn { width: 100%; justify-content: center; }
  .tools-grid { grid-template-columns: 1fr; }
  .explore-grid { grid-template-columns: repeat(2, 1fr); }
  .back-to-top { bottom: 16px; right: 16px; width: 42px; height: 42px; }
}

/* ---------- ACCESSIBILITY ---------- */
:focus-visible {
  outline: 3px solid var(--c-primary);
  outline-offset: 2px;
  border-radius: 4px;
}

@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;
  }
  .reveal { opacity: 1; transform: none; }
}