/* =============================================
   MEMO NOTEPAD ONLINE – STYLES
   Educational Theme with Animations
   ============================================= */

/* ---- CSS VARIABLES ---- */
:root {
  --primary: #2D6A4F;
  --primary-light: #52B788;
  --primary-dark: #1B4332;
  --accent: #F4A261;
  --accent-dark: #E76F51;
  --bg: #F8F5F0;
  --bg-alt: #FFFEF9;
  --surface: #FFFFFF;
  --surface-2: #F0EDE7;
  --border: #DDD8CE;
  --text: #1A1A2E;
  --text-muted: #6B6560;
  --text-light: #9E998F;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-md: 0 6px 24px rgba(0,0,0,0.10);
  --shadow-lg: 0 16px 48px rgba(0,0,0,0.14);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --font-display: 'Playfair Display', Georgia, serif;
  --font-body: 'DM Sans', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --header-h: 68px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.dark-mode {
  --bg: #0F1117;
  --bg-alt: #161923;
  --surface: #1E2130;
  --surface-2: #252839;
  --border: #2E3348;
  --text: #EEEAE2;
  --text-muted: #9BA3BF;
  --text-light: #6B7280;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-md: 0 6px 24px rgba(0,0,0,0.4);
  --shadow-lg: 0 16px 48px rgba(0,0,0,0.5);
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, select, textarea { font-family: inherit; }
ul { list-style: none; }

/* ---- CONTAINER ---- */
.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---- TYPOGRAPHY ---- */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--primary-light);
  background: rgba(82, 183, 136, 0.12);
  padding: 6px 14px;
  border-radius: 100px;
  margin-bottom: 18px;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 3.5vw, 2.8rem);
  font-weight: 700;
  line-height: 1.22;
  color: var(--text);
  margin-bottom: 16px;
}

.section-sub {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 560px;
  margin-bottom: 56px;
}

.accent-text {
  color: var(--primary-light);
  position: relative;
}

.accent-text::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 0;
  width: 100%;
  height: 6px;
  background: rgba(82, 183, 136, 0.22);
  border-radius: 4px;
  z-index: -1;
}

/* ---- BUTTONS ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  transition: all var(--transition);
  cursor: pointer;
}

.btn svg { width: 18px; height: 18px; }

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 20px rgba(45, 106, 79, 0.35);
}
.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(45, 106, 79, 0.45);
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 2px solid var(--border);
}
.btn-ghost:hover {
  border-color: var(--primary-light);
  color: var(--primary-light);
  transform: translateY(-2px);
}

.btn-large { padding: 16px 36px; font-size: 1.05rem; }

.btn-sm {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 500;
  background: var(--surface-2);
  color: var(--text);
  transition: all var(--transition);
  border: 1px solid var(--border);
}
.btn-sm svg { width: 14px; height: 14px; }
.btn-sm:hover { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-sm.btn-danger:hover { background: #E63946; border-color: #E63946; }

.btn-icon {
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--primary);
  color: #fff;
  transition: all var(--transition);
}
.btn-icon svg { width: 16px; height: 16px; }
.btn-icon:hover { background: var(--primary-dark); transform: scale(1.1); }

/* ---- HEADER ---- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-h);
  z-index: 1000;
  background: rgba(248, 245, 240, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}
.dark-mode .site-header { background: rgba(15, 17, 23, 0.88); }

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.header-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  white-space: nowrap;
}

.logo-icon {
  width: 36px; height: 36px;
  background: var(--primary);
  border-radius: 9px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem;
}

.header-nav { display: flex; align-items: center; gap: 4px; }
.nav-link {
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: all var(--transition);
}
.nav-link:hover { color: var(--text); background: var(--surface-2); }
.nav-link.active { color: var(--primary); }

.header-actions { display: flex; align-items: center; gap: 10px; }

.dark-toggle {
  width: 40px; height: 40px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  color: var(--text);
  font-size: 1.1rem;
  transition: all var(--transition);
  border: 1px solid var(--border);
}
.dark-toggle:hover { background: var(--primary); color: #fff; }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  background: none;
}
.hamburger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all var(--transition);
}

.mobile-nav {
  display: none;
  flex-direction: column;
  position: fixed;
  top: var(--header-h);
  left: 0; right: 0;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: 16px;
  gap: 4px;
  z-index: 999;
  animation: slideDown 0.3s ease;
}
.mobile-nav.open { display: flex; }
.mobile-nav .nav-link { padding: 12px 16px; border-radius: var(--radius-sm); }

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---- HERO SECTION ---- */
.hero-section {
  min-height: 100vh;
  padding-top: calc(var(--header-h) + 60px);
  padding-bottom: 80px;
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

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

.lines-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(45, 106, 79, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(45, 106, 79, 0.04) 1px, transparent 1px);
  background-size: 60px 60px;
}

.floating-papers { position: absolute; inset: 0; }
.paper {
  position: absolute;
  font-size: 2rem;
  animation: floatPaper 8s ease-in-out infinite;
  opacity: 0.45;
}
.p1 { top: 15%; left: 8%; animation-delay: 0s; }
.p2 { top: 60%; left: 4%; animation-delay: 1.5s; }
.p3 { top: 20%; right: 10%; animation-delay: 3s; }
.p4 { top: 70%; right: 7%; animation-delay: 2s; }
.p5 { top: 40%; right: 20%; animation-delay: 4s; }

@keyframes floatPaper {
  0%, 100% { transform: translateY(0) rotate(-5deg); }
  50% { transform: translateY(-20px) rotate(5deg); }
}

.hero-inner {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 780px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 8px 18px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 28px;
  box-shadow: var(--shadow-sm);
  animation: fadeUp 0.7s ease both;
}
.badge-dot {
  width: 8px; height: 8px;
  background: var(--primary-light);
  border-radius: 50%;
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(1.3); }
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  font-weight: 900;
  line-height: 1.14;
  margin-bottom: 22px;
  animation: fadeUp 0.8s ease 0.1s both;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 550px;
  margin: 0 auto 36px;
  animation: fadeUp 0.8s ease 0.2s both;
}

.hero-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 56px;
  animation: fadeUp 0.8s ease 0.3s both;
}

.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 18px 32px;
  box-shadow: var(--shadow-sm);
  animation: fadeUp 0.8s ease 0.4s both;
}

.stat { text-align: center; padding: 0 28px; }
.stat-num {
  display: block;
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--primary);
}
.stat-label { font-size: 0.78rem; color: var(--text-muted); font-weight: 500; }
.stat-div { width: 1px; height: 36px; background: var(--border); }

.hero-scroll-hint {
  position: absolute;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  color: var(--text-light);
  animation: fadeUp 1s ease 1s both;
}
.scroll-arrow {
  width: 20px; height: 20px;
  border-right: 2px solid var(--text-light);
  border-bottom: 2px solid var(--text-light);
  transform: rotate(45deg);
  animation: arrowBounce 1.5s ease-in-out infinite;
}
@keyframes arrowBounce {
  0%, 100% { transform: rotate(45deg) translateY(0); }
  50% { transform: rotate(45deg) translateY(4px); }
}

/* ---- APP SECTION ---- */
.app-section {
  padding: 100px 0;
  background: var(--bg-alt);
}

.app-section .section-title,
.app-section .section-sub,
.app-section .section-label { text-align: center; }
.app-section .section-sub { margin: 0 auto 48px; }

.app-wrapper {
  display: grid;
  grid-template-columns: 260px 1fr;
  height: 600px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

/* Sidebar */
.app-sidebar {
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border);
  background: var(--surface-2);
}
.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 16px 12px;
  border-bottom: 1px solid var(--border);
}
.sidebar-header h3 { font-size: 0.9rem; font-weight: 600; }
.sidebar-search {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
}
.sidebar-search svg { width: 14px; height: 14px; color: var(--text-light); flex-shrink: 0; }
.sidebar-search input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  font-size: 0.83rem;
  color: var(--text);
}
.notes-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}
.notes-list::-webkit-scrollbar { width: 4px; }
.notes-list::-webkit-scrollbar-track { background: transparent; }
.notes-list::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

.note-item {
  padding: 11px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  border: 1px solid transparent;
}
.note-item:hover { background: var(--surface); border-color: var(--border); }
.note-item.active {
  background: var(--surface);
  border-color: var(--primary-light);
  box-shadow: var(--shadow-sm);
}
.note-item-title {
  font-size: 0.85rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 3px;
}
.note-item-preview {
  font-size: 0.76rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.note-item-date {
  font-size: 0.7rem;
  color: var(--text-light);
  margin-top: 4px;
}

/* Editor */
.app-editor { display: flex; flex-direction: column; overflow: hidden; }

.editor-toolbar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-2);
}

.toolbar-group { display: flex; align-items: center; gap: 2px; }

.tool-btn {
  width: 30px; height: 30px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 6px;
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: all var(--transition);
}
.tool-btn:hover { background: var(--surface); color: var(--text); }
.tool-btn.active { background: var(--primary); color: #fff; }

.tool-select {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 8px;
  font-size: 0.8rem;
  color: var(--text);
  outline: none;
  cursor: pointer;
}

.tool-divider {
  width: 1px; height: 20px;
  background: var(--border);
  margin: 0 4px;
}

.color-picker {
  width: 30px; height: 30px;
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  padding: 2px;
  background: var(--surface);
}

.note-title-input {
  padding: 14px 20px 10px;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border);
  outline: none;
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text);
  width: 100%;
}
.note-title-input::placeholder { color: var(--text-light); }

.note-editor {
  flex: 1;
  padding: 18px 20px;
  outline: none;
  overflow-y: auto;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--text);
  min-height: 0;
}
.note-editor:empty::before {
  content: attr(data-placeholder);
  color: var(--text-light);
  pointer-events: none;
}
.note-editor::-webkit-scrollbar { width: 4px; }
.note-editor::-webkit-scrollbar-track { background: transparent; }
.note-editor::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

.editor-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  padding: 10px 16px;
  border-top: 1px solid var(--border);
  background: var(--surface-2);
}
.footer-meta { display: flex; align-items: center; gap: 14px; font-size: 0.78rem; color: var(--text-light); }
.save-status { color: var(--primary-light); font-weight: 500; }
.footer-actions { display: flex; align-items: center; gap: 8px; }

/* ---- FEATURES SECTION ---- */
.features-section { padding: 100px 0; }

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 22px;
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 30px;
  transition: all var(--transition);
  opacity: 0;
  transform: translateY(30px);
}
.feature-card.visible { opacity: 1; transform: translateY(0); }
.feature-card:hover {
  border-color: var(--primary-light);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.feature-icon { font-size: 2rem; margin-bottom: 14px; }
.feature-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 10px; }
.feature-card p { font-size: 0.9rem; color: var(--text-muted); line-height: 1.65; }

/* ---- HOW IT WORKS ---- */
.how-section {
  padding: 100px 0;
  background: var(--bg-alt);
}

.steps-wrapper { position: relative; display: flex; flex-direction: column; gap: 0; }
.steps-line {
  position: absolute;
  left: 50px;
  top: 0; bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--primary-light), transparent);
}

.step {
  display: grid;
  grid-template-columns: 100px 1fr 1fr;
  gap: 32px;
  align-items: center;
  padding: 48px 0;
  border-bottom: 1px solid var(--border);
}
.step:last-child { border-bottom: none; }

.step-reverse { grid-template-columns: 100px 1fr 1fr; }
.step-reverse .step-content { order: 1; }
.step-reverse .step-visual { order: -1; }

.step-num {
  font-family: var(--font-display);
  font-size: 3.5rem;
  font-weight: 900;
  color: var(--primary-light);
  opacity: 0.35;
  text-align: center;
  position: relative;
  z-index: 1;
}

.step-content h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 12px; }
.step-content p { font-size: 0.93rem; color: var(--text-muted); line-height: 1.7; }

.step-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}
.step-card-header {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 12px 16px;
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
}
.step-card-header span {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--border);
}
.step-card-header span:first-child { background: #FF5F57; }
.step-card-header span:nth-child(2) { background: #FEBC2E; }
.step-card-header span:last-child { background: #28C840; }

.step-card-body { padding: 20px; display: flex; flex-direction: column; gap: 10px; }
.line-sim { height: 10px; background: var(--surface-2); border-radius: 6px; }

.typing-demo {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--text);
  padding: 6px;
}
.cursor-blink { animation: blink 1s step-end infinite; }
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:0} }

.btn-sim {
  display: inline-block;
  padding: 8px 16px;
  background: var(--primary);
  color: #fff;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 600;
  text-align: center;
  margin-bottom: 8px;
}
.btn-sim-ghost {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
}

/* ---- USE CASES ---- */
.usecases-section { padding: 100px 0; }

.usecases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.usecase-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: all var(--transition);
  position: relative;
}
.usecase-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--primary-light); }
.usecase-badge {
  position: absolute;
  top: -12px; left: 20px;
  background: var(--accent);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 100px;
  letter-spacing: 0.06em;
}
.usecase-emoji { font-size: 2.2rem; margin-bottom: 14px; }
.usecase-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 10px; }
.usecase-card > p { font-size: 0.88rem; color: var(--text-muted); margin-bottom: 14px; }
.usecase-card ul { display: flex; flex-direction: column; gap: 6px; }
.usecase-card li {
  font-size: 0.83rem;
  color: var(--text-muted);
  padding-left: 16px;
  position: relative;
}
.usecase-card li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--primary-light);
  font-size: 0.8rem;
}
.usecase-featured { border-color: var(--primary-light); }

/* ---- WHY US ---- */
.why-section { padding: 100px 0; background: var(--bg-alt); }

.why-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.why-content > p { font-size: 0.95rem; color: var(--text-muted); margin-bottom: 32px; }

.why-list { display: flex; flex-direction: column; gap: 22px; }
.why-item { display: flex; align-items: flex-start; gap: 16px; }
.why-check {
  width: 26px; height: 26px;
  background: var(--primary);
  color: #fff;
  border-radius: 6px;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.9rem;
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 2px;
}
.why-item strong { display: block; font-size: 0.95rem; font-weight: 700; margin-bottom: 4px; }
.why-item p { font-size: 0.87rem; color: var(--text-muted); margin: 0; }

.comparison-table {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}
.ct-header, .ct-row {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 0;
}
.ct-header {
  background: var(--primary);
  color: #fff;
  font-size: 0.82rem;
  font-weight: 700;
}
.ct-header > *, .ct-row > * {
  padding: 12px 18px;
  border-right: 1px solid rgba(255,255,255,0.12);
  font-size: 0.88rem;
}
.ct-header .ct-us, .ct-row .ct-us { background: rgba(255,255,255,0.1); }
.ct-row { border-bottom: 1px solid var(--border); font-size: 0.88rem; }
.ct-row:last-child { border-bottom: none; }
.ct-row > * { border-right: 1px solid var(--border); text-align: center; }
.ct-row > *:first-child { text-align: left; color: var(--text-muted); }
.ct-row .ct-us { background: rgba(82, 183, 136, 0.07); color: var(--primary-light); font-weight: 600; }
.ct-row:last-child > * { border-bottom: none; }

/* ---- TIPS ---- */
.tips-section { padding: 100px 0; }

.tips-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.tip-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.tip-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 4px; height: 100%;
  background: var(--primary);
  opacity: 0;
  transition: opacity var(--transition);
}
.tip-card:hover::before { opacity: 1; }
.tip-card:hover { transform: translateX(4px); box-shadow: var(--shadow-md); }

.tip-number {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--primary-light);
  background: rgba(82, 183, 136, 0.12);
  display: inline-block;
  padding: 4px 10px;
  border-radius: 100px;
  margin-bottom: 14px;
}
.tip-card h4 { font-size: 1rem; font-weight: 700; margin-bottom: 10px; }
.tip-card p { font-size: 0.87rem; color: var(--text-muted); line-height: 1.65; }

/* ---- FAQ ---- */
.faq-section { padding: 100px 0; background: var(--bg-alt); }
.faq-section .section-title, .faq-section .section-label { text-align: center; }

.faq-list { max-width: 760px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }

.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition);
}
.faq-item.open { border-color: var(--primary-light); }

.faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 22px;
  text-align: left;
  font-size: 0.97rem;
  font-weight: 600;
  color: var(--text);
  transition: color var(--transition);
}
.faq-q:hover { color: var(--primary-light); }
.faq-icon {
  font-size: 1.3rem;
  font-weight: 300;
  color: var(--primary-light);
  transition: transform var(--transition);
  flex-shrink: 0;
}
.faq-item.open .faq-icon { transform: rotate(45deg); }

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}
.faq-item.open .faq-a { max-height: 300px; }
.faq-a p {
  padding: 0 22px 20px;
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.75;
}

/* ---- CTA SECTION ---- */
.cta-section { padding: 100px 0; }

.cta-box {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-light) 100%);
  border-radius: var(--radius-lg);
  padding: 80px 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-dots {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(255,255,255,0.08) 1px, transparent 1px);
  background-size: 28px 28px;
}

.cta-box h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  font-weight: 700;
  color: #fff;
  margin-bottom: 18px;
  position: relative;
  z-index: 1;
}
.cta-box h2 .accent-text { color: #B7E4C7; }
.cta-box h2 .accent-text::after { background: rgba(183, 228, 199, 0.25); }
.cta-box > p {
  color: rgba(255,255,255,0.78);
  max-width: 520px;
  margin: 0 auto 36px;
  font-size: 1rem;
  position: relative;
  z-index: 1;
}
.cta-box .btn-primary {
  background: #fff;
  color: var(--primary-dark);
  box-shadow: 0 4px 20px rgba(0,0,0,0.2);
  position: relative;
  z-index: 1;
}
.cta-box .btn-primary:hover {
  background: #F0FFF4;
  transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.28);
}
.cta-note {
  margin-top: 20px;
  font-size: 0.82rem;
  color: rgba(255,255,255,0.55);
  position: relative;
  z-index: 1;
}

/* ---- FOOTER ---- */
.site-footer {
  background: var(--text);
  color: rgba(255,255,255,0.7);
  padding: 64px 0 32px;
}
.dark-mode .site-footer { background: #0A0C10; }

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 56px;
}

.footer-brand .header-logo { color: #fff; margin-bottom: 14px; }
.footer-brand p { font-size: 0.87rem; line-height: 1.7; max-width: 260px; }

.footer-col h4 {
  font-size: 0.85rem;
  font-weight: 700;
  color: #fff;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col a {
  font-size: 0.87rem;
  color: rgba(255,255,255,0.55);
  transition: color var(--transition);
}
.footer-col a:hover { color: var(--primary-light); }

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.1);
  font-size: 0.82rem;
}
.footer-bottom p { color: rgba(255,255,255,0.35); }

/* ---- TOAST ---- */
.toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--text);
  color: var(--bg);
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  z-index: 9999;
  transition: transform 0.3s ease;
  pointer-events: none;
}
.dark-mode .toast { background: #E8E8E8; color: #111; }
.toast.show { transform: translateX(-50%) translateY(0); }

/* ---- ANIMATIONS ---- */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---- SCROLLBAR ---- */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 8px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ---- RESPONSIVE ---- */
@media (max-width: 960px) {
  .app-wrapper { grid-template-columns: 1fr; height: auto; }
  .app-sidebar { height: 220px; border-right: none; border-bottom: 1px solid var(--border); }
  .app-editor { height: 480px; }
  .usecases-grid { grid-template-columns: repeat(2, 1fr); }
  .tips-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .why-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  :root { --header-h: 60px; }
  .header-nav { display: none; }
  .hamburger { display: flex; }
  .step { grid-template-columns: 70px 1fr; }
  .step-visual { display: none; }
  .steps-line { left: 34px; }
  .usecases-grid { grid-template-columns: 1fr; }
  .tips-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .hero-stats { padding: 14px 16px; }
  .stat { padding: 0 14px; }
  .stat-num { font-size: 1.4rem; }
  .cta-box { padding: 48px 24px; }
  .section-sub { margin-bottom: 36px; }
}

@media (max-width: 500px) {
  .editor-toolbar { gap: 2px; }
  .toolbar-group { flex-wrap: wrap; }
  .hero-cta { flex-direction: column; }
  .features-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
}