/* ===================================================================
   Book&Mind - Minimalist & Presentable Stylesheet
   Palette: Coffee (#6B4E3D), Terracotta (#D97757), Cream (#F8EEDD)
   Neutrals: N900 (#1A1A1A), N700 (#4A4A4A), N500 (#7A7A7A), N300 (#E4E4E0), N100 (#FAFAF8)
   =================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Newsreader:ital,opsz,wght@0,6..72,500;0,6..72,600;0,6..72,700;1,6..72,500&family=Plus+Jakarta+Sans:wght@400;500;600;700&display=swap');

:root {
  --coffee: #6B4E3D;
  --coffee-dark: #453125;
  --terracotta: #D97757;
  --terracotta-dark: #B85839;
  --cream: #F8EEDD;
  --cream-soft: #FCF8F2;
  --cream-light: #F7EFE4;

  --n900: #1A1A1A;
  --n700: #4A4A4A;
  --n500: #7A7A7A;
  --n300: #E4E4E0;
  --n200: #EFEFEF;
  --n100: #FAFAF8;
  --white: #FFFFFF;

  --font-serif: 'Newsreader', Georgia, serif;
  --font-sans: 'Plus Jakarta Sans', -apple-system, sans-serif;

  --container: 1040px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --radius-full: 9999px;

  --shadow-sm: 0 2px 8px rgba(107, 78, 61, 0.04);
  --shadow-md: 0 8px 24px rgba(107, 78, 61, 0.08);
  --shadow-lg: 0 16px 36px rgba(107, 78, 61, 0.12);
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--n100);
  color: var(--n900);
  line-height: 1.5;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  color: var(--coffee-dark);
}

/* Minimal Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  transition: all 0.2s ease;
  cursor: pointer;
  border: none;
}

.btn-terracotta {
  background: var(--terracotta);
  color: var(--white);
  box-shadow: 0 4px 12px rgba(217, 119, 87, 0.25);
}

.btn-terracotta:hover {
  background: var(--terracotta-dark);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--cream);
  color: var(--coffee);
  border: 1px solid rgba(107, 78, 61, 0.18);
}

.btn-secondary:hover {
  background: #f1e3cc;
  transform: translateY(-1px);
}

/* Navbar */
.navbar-wrap {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 250, 248, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--n300);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand-logo img {
  height: 32px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  list-style: none;
}

.nav-link {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--n700);
  transition: color 0.2s;
}

.nav-link:hover {
  color: var(--coffee);
}

.guide-pill {
  background: var(--cream);
  color: var(--coffee);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(107, 78, 61, 0.2);
  transition: all 0.2s;
}

.guide-pill:hover {
  background: var(--terracotta);
  color: var(--white);
  border-color: var(--terracotta);
}

/* Navbar Actions (Lang Switcher & Download APK) */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.lang-switch-wrap {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  background: var(--cream);
  border: 1px solid rgba(107, 78, 61, 0.18);
  border-radius: var(--radius-full);
  padding: 3px 6px;
}

.lang-toggle-btn {
  background: transparent;
  border: none;
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--n500);
  cursor: pointer;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  transition: all 0.2s ease;
  font-family: var(--font-sans);
}

.lang-toggle-btn:hover {
  color: var(--coffee-dark);
}

.lang-toggle-btn.active {
  background: var(--coffee);
  color: var(--white);
  box-shadow: 0 1px 4px rgba(107, 78, 61, 0.2);
}

.lang-divider {
  font-size: 0.72rem;
  color: rgba(107, 78, 61, 0.35);
  user-select: none;
}

.btn-download-apk {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: var(--terracotta);
  color: var(--white);
  padding: 7px 16px;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 700;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 3px 10px rgba(217, 119, 87, 0.25);
  font-family: var(--font-sans);
}

.btn-download-apk:hover {
  background: var(--terracotta-dark);
  transform: translateY(-1px);
  box-shadow: 0 5px 14px rgba(217, 119, 87, 0.35);
}

.btn-download-apk:active {
  transform: translateY(0);
}

.btn-download-apk svg {
  flex-shrink: 0;
}

/* Hero */
.hero {
  padding: 55px 0 65px;
}

.hero-layout {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 40px;
}

.hero-text {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.hero-tagline {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--terracotta);
}

.hero-title {
  font-size: 3.1rem;
  font-weight: 700;
  line-height: 1.12;
  color: var(--coffee-dark);
}

.hero-title span {
  color: var(--terracotta);
  font-style: italic;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--n700);
  line-height: 1.55;
  max-width: 460px;
}

.hero-cta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 4px;
}

.hero-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
  padding-top: 14px;
  border-top: 1px solid var(--n300);
}

.pill-item {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--n700);
  background: var(--white);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--n300);
}

.hero-phone-wrap {
  display: flex;
  justify-content: center;
}

/* Hero Frameless Screen */
.hero-screen-wrap {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-screen-img {
  width: 100%;
  max-width: 240px;
  border-radius: 20px;
  box-shadow: 0 18px 40px -8px rgba(107, 78, 61, 0.22);
  border: 1px solid rgba(107, 78, 61, 0.12);
  background: #FAF8F5;
  display: block;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.hero-screen-img:hover {
  transform: translateY(-4px);
  box-shadow: 0 22px 46px -6px rgba(107, 78, 61, 0.28);
}

/* Minimal 4-Grid Features */
.features-section {
  padding: 55px 0;
  background: var(--cream-soft);
  border-top: 1px solid var(--n300);
  border-bottom: 1px solid var(--n300);
}

.features-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.feat-card {
  background: var(--white);
  border-radius: var(--radius-md);
  padding: 20px 18px;
  border: 1px solid rgba(107, 78, 61, 0.08);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: transform 0.2s;
}

.feat-card:hover {
  transform: translateY(-3px);
  border-color: var(--terracotta);
}

.feat-icon {
  font-size: 1.5rem;
}

.feat-card h3 {
  font-size: 1.1rem;
}

.feat-card span {
  font-size: 0.84rem;
  color: var(--n700);
}

/* UI Showcase - Frameless, Tidy & Clean */
.ui-section {
  padding: 70px 0;
  background: var(--cream-light);
}

.section-head {
  text-align: center;
  margin-bottom: 36px;
}

.section-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--terracotta);
  background: rgba(217, 119, 87, 0.08);
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 8px;
}

.section-head h2 {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  color: var(--coffee-dark);
  margin: 0;
}

.section-sub {
  font-size: 0.95rem;
  color: var(--n700);
  max-width: 580px;
  margin: 8px auto 0;
  line-height: 1.5;
}

.ui-grid-6 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.ui-card {
  background: var(--white);
  border: 1px solid rgba(107, 78, 61, 0.12);
  border-radius: 24px;
  padding: 24px 20px 22px;
  box-shadow: 0 4px 16px rgba(107, 78, 61, 0.05);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  cursor: default;
}

.ui-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 32px rgba(107, 78, 61, 0.11);
  border-color: rgba(217, 119, 87, 0.35);
}

.ui-card-meta {
  margin-bottom: 16px;
  width: 100%;
}

.ui-card-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--terracotta);
  text-transform: uppercase;
  margin-bottom: 4px;
}

.ui-card-title {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--coffee-dark);
  margin-bottom: 4px;
}

.ui-card-desc {
  font-size: 0.8rem;
  color: var(--n500);
  line-height: 1.4;
  margin: 0;
}

/* Frameless Screenshot Presentation */
.ui-screen-wrap {
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
}

.ui-screen-img {
  width: 100%;
  max-width: 215px;
  border-radius: 16px;
  box-shadow: 0 10px 24px rgba(107, 78, 61, 0.10);
  border: 1px solid rgba(107, 78, 61, 0.10);
  background: #FAF8F5;
  display: block;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.ui-card:hover .ui-screen-img {
  transform: translateY(-2px);
  box-shadow: 0 14px 28px rgba(107, 78, 61, 0.14);
}

/* ===================================================================
   ENHANCED USER GUIDELINE (Frameless 2-Column Showcase)
   =================================================================== */
.guideline-section {
  padding: 70px 0 80px;
  background: var(--cream-soft);
  border-top: 1px solid var(--n300);
}

/* Stepper Navigation Bar */
.guide-stepper-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 28px;
}

.g-step-tab {
  background: var(--white);
  border: 1.5px solid var(--n300);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 12px;
  transition: all 0.22s ease;
  user-select: none;
}

.g-step-tab:hover {
  border-color: rgba(217, 119, 87, 0.5);
  background: #FFFDFB;
}

.g-step-tab.active {
  background: var(--white);
  border-color: var(--terracotta);
  box-shadow: 0 4px 14px rgba(217, 119, 87, 0.16);
}

.g-num-badge {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--n200);
  color: var(--n700);
  font-size: 0.78rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.2s;
}

.g-step-tab.active .g-num-badge {
  background: var(--terracotta);
  color: var(--white);
}

.g-step-title {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--n700);
  transition: color 0.2s;
}

.g-step-tab.active .g-step-title {
  color: var(--coffee-dark);
  font-weight: 700;
}

/* Main Showcase Card */
.guide-showcase-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(107, 78, 61, 0.12);
  box-shadow: var(--shadow-md);
  padding: 40px 44px;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 40px;
  position: relative;
}

/* Left Column: Step Details */
.guide-info-side {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.guide-step-tag {
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--terracotta);
}

.guide-step-h3 {
  font-size: 1.9rem;
  color: var(--coffee-dark);
  line-height: 1.2;
}

.guide-step-lead {
  font-size: 0.98rem;
  color: var(--n700);
  line-height: 1.55;
}

.guide-bullet-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 4px;
}

.guide-bullet-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--coffee-dark);
}

.guide-bullet-icon {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--cream);
  color: var(--coffee);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.78rem;
  flex-shrink: 0;
}

/* Nav Buttons inside Step */
.guide-actions-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 6px;
  padding-top: 16px;
  border-top: 1px solid var(--n200);
}

.guide-step-btn {
  padding: 8px 16px;
  border-radius: var(--radius-md);
  font-size: 0.84rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  border: 1px solid var(--n300);
  background: var(--white);
  color: var(--n700);
}

.guide-step-btn:hover {
  background: var(--cream);
  color: var(--coffee-dark);
  border-color: rgba(107, 78, 61, 0.2);
}

.guide-step-btn.next-btn {
  background: var(--coffee);
  color: var(--white);
  border-color: var(--coffee);
}

.guide-step-btn.next-btn:hover {
  background: var(--coffee-dark);
}

/* Right Column: Frameless Clean Showcase & Floating Badge */
.guide-mockup-side {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.guide-screen-wrap {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.guide-screen-img {
  width: 100%;
  max-width: 215px;
  border-radius: 18px;
  box-shadow: 0 16px 36px rgba(107, 78, 61, 0.16);
  border: 1px solid rgba(107, 78, 61, 0.12);
  background: #FAF8F5;
  display: block;
  transition: opacity 0.2s ease, transform 0.25s ease;
}

.guide-screen-img:hover {
  transform: translateY(-3px);
}

.guide-floating-badge {
  position: absolute;
  bottom: 18px;
  right: -8px;
  z-index: 4;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
  padding: 9px 14px;
  border-radius: var(--radius-md);
  box-shadow: 0 8px 24px rgba(107, 78, 61, 0.16);
  border: 1px solid rgba(107, 78, 61, 0.15);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--coffee-dark);
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 8px;
  animation: floatSubtle 3.5s ease-in-out infinite alternate;
}

@keyframes floatSubtle {
  0% { transform: translateY(0); }
  100% { transform: translateY(-6px); }
}

/* Footer */
.footer-min {
  background: #25201D;
  color: rgba(255, 255, 255, 0.6);
  padding: 26px 0;
  font-size: 0.82rem;
}

.footer-flex {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--cream);
  font-weight: 600;
}

.footer-brand img {
  height: 22px;
  filter: brightness(0) invert(1);
}

/* Toast Notice */
.toast-notice {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(30px);
  background: #25201D;
  color: #FFFFFF;
  padding: 12px 24px;
  border-radius: var(--radius-full);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.25);
  font-size: 0.88rem;
  font-weight: 600;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.toast-notice.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}

/* Responsive */
@media (max-width: 900px) {
  .hero-layout { grid-template-columns: 1fr; text-align: center; }
  .hero-text { align-items: center; }
  .hero-cta { justify-content: center; }
  .hero-pills { justify-content: center; }
  .features-grid-4 { grid-template-columns: repeat(2, 1fr); }
  .ui-grid-6 { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .guide-stepper-bar { grid-template-columns: repeat(2, 1fr); }
  .guide-showcase-card { grid-template-columns: 1fr; padding: 32px 24px; text-align: center; }
  .guide-info-side { align-items: center; }
  .guide-actions-row { justify-content: center; }
  .guide-floating-badge { right: auto; bottom: -12px; }
}

@media (max-width: 680px) {
  .navbar { height: auto; padding: 12px 0; flex-wrap: wrap; gap: 12px; }
  .nav-links { order: 3; width: 100%; justify-content: center; gap: 14px; }
  .nav-actions { margin-left: auto; }
}

@media (max-width: 600px) {
  .hero-title { font-size: 2.2rem; }
  .features-grid-4 { grid-template-columns: 1fr; }
  .ui-grid-6 { grid-template-columns: 1fr; gap: 18px; }
  .ui-card { padding: 20px 16px 18px; }
  .guide-stepper-bar { grid-template-columns: 1fr; }
  .footer-flex { flex-direction: column; text-align: center; }
}