/* Style system for Nhật Ký App - "Heritage" Theme */
/* Architectural Minimalism meets Journalistic Gravitas. Matte finish broadsheet/gallery feel. */

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

:root {
  --font-sans: 'Public Sans', sans-serif;
  --font-caps: 'Space Grotesk', sans-serif;
  
  /* Color Palette - Heritage */
  --bg-neutral: #F7F5F2; /* Warm limestone foundation */
  --bg-card: #FFFFFF;    /* Crisp paper white */
  --color-primary: #1A1C1E; /* Deep ink for headlines and core text */
  --color-secondary: #6C7278; /* Sophisticated slate for borders, captions, metadata */
  --color-tertiary: #B8422E; /* "Boston Clay" — sole interaction accent */
  --color-tertiary-hover: #9E3220;
  
  --border-thin: 1px solid rgba(108, 114, 120, 0.25);
  --border-focus: 1px solid var(--color-primary);
  --border-accent: 1px solid var(--color-tertiary);
  
  /* Border Radii - Sharp & Architectural */
  --radius-sm: 4px;
  --radius-md: 8px;
  
  /* Spacing */
  --spacing-sm: 8px;
  --spacing-md: 16px;
  
  --transition-fast: 0.15s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Reset & Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-family: var(--font-sans);
  background-color: var(--bg-neutral);
  color: var(--color-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  overflow-x: hidden;
  background-color: var(--bg-neutral);
  line-height: 1.6;
}

/* Custom Scrollbar - Editorial Style */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-neutral);
}
::-webkit-scrollbar-thumb {
  background: var(--color-secondary);
  border-radius: var(--radius-sm);
  border: 2px solid var(--bg-neutral);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary);
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Editorial Panel (Broadsheet columns/cards) */
.glass-panel {
  background: var(--bg-card);
  border: var(--border-thin);
  border-radius: var(--radius-md);
  box-shadow: 0 2px 8px rgba(26, 28, 30, 0.04);
  transition: var(--transition-normal);
}

.glass-panel:hover {
  border-color: rgba(26, 28, 30, 0.4);
  box-shadow: 0 4px 16px rgba(26, 28, 30, 0.08);
}

/* Section Common Styling */
section {
  padding: 100px 0;
  border-bottom: var(--border-thin);
}

.section-tag {
  display: inline-block;
  font-family: var(--font-caps);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-tertiary);
  margin-bottom: 12px;
}

.section-title {
  font-family: var(--font-sans);
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.15;
  color: var(--color-primary);
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-desc {
  font-family: var(--font-sans);
  font-size: 1.125rem;
  color: var(--color-secondary);
  max-width: 650px;
  margin-bottom: 48px;
  font-weight: 400;
}

/* Typography & Links */
a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition-fast);
}

p {
  color: var(--color-primary);
  opacity: 0.9;
}

/* Header & Navbar */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  padding: 24px 0;
  transition: var(--transition-normal);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 32px;
  border-radius: var(--radius-md);
  background: rgba(247, 245, 242, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: var(--border-thin);
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-caps);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.logo-icon {
  width: 28px;
  height: 28px;
  background: var(--color-primary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--bg-neutral);
  font-size: 0.9rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  font-family: var(--font-caps);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-secondary);
  position: relative;
}

.nav-links a:hover, .nav-links a.active {
  color: var(--color-primary);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-tertiary);
  transition: var(--transition-normal);
}

.nav-links a:hover::after, .nav-links a.active::after {
  width: 100%;
}

.nav-cta {
  font-family: var(--font-caps);
  padding: 8px 20px;
  border-radius: var(--radius-sm);
  background: var(--color-tertiary);
  color: white;
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  box-shadow: none;
}

.nav-cta:hover {
  background: var(--color-tertiary-hover);
  transform: translateY(-1px);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  cursor: pointer;
}

.menu-toggle span {
  width: 20px;
  height: 2px;
  background-color: var(--color-primary);
  transition: var(--transition-normal);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  font-family: var(--font-caps);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: var(--transition-normal);
}

.btn-primary {
  background: var(--color-tertiary);
  color: white;
  border: 1px solid var(--color-tertiary);
}

.btn-primary:hover {
  background: var(--color-tertiary-hover);
  border-color: var(--color-tertiary-hover);
  transform: translateY(-2px);
}

.btn-secondary {
  background: transparent;
  color: var(--color-primary);
  border: var(--border-thin);
}

.btn-secondary:hover {
  background: var(--bg-card);
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 140px;
  position: relative;
  overflow: hidden;
  border-bottom: var(--border-thin);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.hero-title {
  font-family: var(--font-sans);
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 24px;
  letter-spacing: -0.03em;
  color: var(--color-primary);
}

.hero-title span {
  color: var(--color-tertiary);
}

.hero-desc {
  font-family: var(--font-sans);
  font-size: 1.15rem;
  color: var(--color-secondary);
  margin-bottom: 36px;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-bottom: 48px;
}

.hero-stats {
  display: flex;
  gap: 48px;
  border-top: var(--border-thin);
  padding-top: 24px;
  width: 100%;
}

.stat-item h3 {
  font-family: var(--font-sans);
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.stat-item p {
  font-family: var(--font-caps);
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--color-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.hero-preview {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.phone-mockup {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 310px;
  border-radius: var(--radius-md);
  padding: 8px;
  background: var(--bg-card);
  border: var(--border-thin);
  box-shadow: 0 12px 32px rgba(26, 28, 30, 0.06);
  animation: floatPhone 6s ease-in-out infinite;
}

.phone-screen {
  background: var(--bg-neutral);
  border-radius: var(--radius-sm);
  overflow: hidden;
  aspect-ratio: 9 / 19.5;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  border: var(--border-thin);
}

.phone-screen img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Features Section */
.features {
  background: #FAF8F5; /* Extremely soft limestone variation */
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 32px;
}

.feature-card {
  padding: 40px;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: var(--border-thin);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.feature-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: var(--bg-neutral);
  border: var(--border-thin);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-tertiary);
  margin-bottom: 24px;
  font-size: 1.1rem;
  transition: var(--transition-fast);
}

.feature-card:hover {
  border-color: var(--color-primary);
}

.feature-card:hover .feature-icon {
  background: var(--color-primary);
  color: var(--bg-neutral);
  border-color: var(--color-primary);
}

.feature-card h3 {
  font-family: var(--font-sans);
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.feature-card p {
  color: var(--color-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Showcase Section - Gallery Style */
.showcase-slider-wrapper {
  position: relative;
  width: 100%;
  margin-top: 40px;
}

.showcase-slider {
  display: flex;
  gap: 32px;
  overflow-x: auto;
  padding: 16px 4px;
  scroll-snap-type: x mandatory;
  scrollbar-width: none; /* Firefox */
  scroll-behavior: smooth;
}

.showcase-slider::-webkit-scrollbar {
  display: none; /* Chrome/Safari */
}

.showcase-item {
  flex: 0 0 280px;
  scroll-snap-align: center;
  border-radius: var(--radius-md);
  overflow: hidden;
  padding: 12px;
  background: var(--bg-card);
  border: var(--border-thin);
  transition: var(--transition-normal);
  cursor: pointer;
}

.showcase-item:hover {
  transform: translateY(-8px);
  border-color: var(--color-primary);
  box-shadow: 0 16px 32px rgba(26, 28, 30, 0.08);
}

.showcase-img-container {
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--bg-neutral);
  aspect-ratio: 9 / 19.5;
  display: flex;
  align-items: center;
  justify-content: center;
  border: var(--border-thin);
}

.showcase-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition-normal);
}

.showcase-info {
  padding: 16px 4px 4px;
  text-align: left;
}

.showcase-info h4 {
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--color-primary);
}

.showcase-info p {
  font-family: var(--font-caps);
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-secondary);
}

/* Slider Controls */
.slider-nav {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 32px;
}

.slider-btn {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: var(--border-thin);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-fast);
}

.slider-btn:hover {
  background: var(--color-primary);
  color: var(--bg-neutral);
  border-color: var(--color-primary);
}

/* Download Section */
.download {
  position: relative;
  background: var(--bg-neutral);
}

.download-box {
  padding: 80px 48px;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: var(--border-thin);
  text-align: center;
}

.download-content {
  max-width: 650px;
  margin: 0 auto;
}

.download-title {
  font-family: var(--font-sans);
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  color: var(--color-primary);
}

.download-desc {
  color: var(--color-secondary);
  font-size: 1.1rem;
  margin-bottom: 40px;
}

.download-buttons {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 24px;
}

.play-store-btn {
  display: inline-block;
  max-width: 200px;
  transition: var(--transition-normal);
  border: var(--border-thin);
  border-radius: var(--radius-sm);
  padding: 6px;
  background: #000; /* Contrast black frame for play store button badge */
}

.play-store-btn:hover {
  transform: translateY(-2px);
  border-color: var(--color-primary);
}

.play-store-btn img {
  width: 100%;
  display: block;
}

/* Footer - Broadhseet Editorial Style */
footer {
  background: var(--bg-neutral);
  border-top: var(--border-thin);
  padding: 80px 0 40px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 64px;
  margin-bottom: 64px;
}

.footer-info {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 20px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-caps);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.footer-desc {
  max-width: 400px;
  font-size: 0.95rem;
  color: var(--color-secondary);
}

.footer-links-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.footer-col h4 {
  font-family: var(--font-caps);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 24px;
  color: var(--color-primary);
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.footer-col a {
  font-size: 0.9rem;
  color: var(--color-secondary);
}

.footer-col a:hover {
  color: var(--color-tertiary);
  padding-left: 2px;
}

.footer-bottom {
  border-top: var(--border-thin);
  padding-top: 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-bottom p {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--color-secondary);
}

.footer-socials {
  display: flex;
  gap: 12px;
}

.social-link {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: var(--border-thin);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-secondary);
  font-size: 0.95rem;
}

.social-link:hover {
  background: var(--color-primary);
  color: var(--bg-neutral);
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

/* Privacy Page Specific Styles */
.privacy-hero {
  padding: 160px 0 60px;
  text-align: left;
  border-bottom: var(--border-thin);
}

.privacy-content-wrapper {
  padding: 60px 0 100px;
}

.privacy-grid {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 48px;
  align-items: start;
}

.privacy-nav {
  position: sticky;
  top: 100px;
  padding: 24px;
  background: var(--bg-card);
}

.privacy-nav h3 {
  font-family: var(--font-caps);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: var(--border-thin);
  color: var(--color-primary);
}

.privacy-nav-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.privacy-nav-links a {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-secondary);
  display: block;
}

.privacy-nav-links a:hover, .privacy-nav-links a.active {
  color: var(--color-tertiary);
  padding-left: 4px;
}

.privacy-text {
  padding: 48px;
  background: var(--bg-card);
}

.privacy-text section {
  padding: 0 0 32px 0;
  border-bottom: var(--border-thin);
  margin-bottom: 32px;
}

.privacy-text section:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.privacy-text h2 {
  font-family: var(--font-sans);
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: 8px;
  letter-spacing: -0.01em;
}

.privacy-text h2 span {
  font-family: var(--font-caps);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-tertiary);
}

.privacy-text p {
  color: var(--color-primary);
  opacity: 0.85;
  margin-bottom: 16px;
  line-height: 1.7;
  font-size: 0.95rem;
}

.privacy-text ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 16px;
  padding-left: 8px;
}

.privacy-text li {
  color: var(--color-primary);
  opacity: 0.85;
  position: relative;
  padding-left: 18px;
  font-size: 0.95rem;
  line-height: 1.6;
}

.privacy-text li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--color-tertiary);
  font-weight: bold;
}

.privacy-text a {
  color: var(--color-tertiary);
  text-decoration: underline;
}

.privacy-text a:hover {
  color: var(--color-primary);
}

.last-updated {
  font-family: var(--font-caps);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-secondary);
  margin-top: 40px;
  display: block;
}

/* Animations */
@keyframes floatPhone {
  0% { transform: translateY(0px); }
  50% { transform: translateY(-10px); }
  100% { transform: translateY(0px); }
}

/* Interactive Image Modal - Lightbox */
.image-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(26, 28, 30, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 200;
  display: none;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.image-modal.active {
  display: flex;
  opacity: 1;
}

.modal-content {
  position: relative;
  max-width: 90%;
  max-height: 85vh;
}

.modal-img {
  max-width: 100%;
  max-height: 80vh;
  border-radius: var(--radius-sm);
  border: var(--border-thin);
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.5);
}

.modal-close {
  position: absolute;
  top: -44px;
  right: 0;
  color: var(--bg-neutral);
  font-size: 2rem;
  cursor: pointer;
  background: none;
  border: none;
}

/* Media Queries */
@media (max-width: 991px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 48px;
  }
  .hero-content {
    align-items: center;
  }
  .hero-title {
    font-size: 2.8rem;
  }
  .hero-actions {
    justify-content: center;
  }
  .hero-stats {
    justify-content: center;
  }
  .privacy-grid {
    grid-template-columns: 1fr;
  }
  .privacy-nav {
    display: none;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .menu-toggle {
    display: flex;
  }
  .section-title {
    font-size: 2rem;
  }
  .privacy-text {
    padding: 24px;
  }
  .download-box {
    padding: 40px 24px;
  }
  .download-buttons {
    flex-direction: column;
    gap: 16px;
  }
  .navbar.active .nav-links {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 80px;
    left: 24px;
    right: 24px;
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 32px;
    border: var(--border-thin);
    gap: 20px;
    z-index: 99;
    box-shadow: 0 10px 24px rgba(26, 28, 30, 0.1);
  }
}