/* ===================================================
   TF's apps — Main Stylesheet
   =================================================== */

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

:root {
  --sky: #45b6fe;
  --sky-dark: #1a8fd1;
  --sky-light: #a8dcff;
  --dark: #0d1117;
  --dark-card: #161b22;
  --dark-surface: #1c2333;
  --dark-border: #2d3748;
  --white: #ffffff;
  --gray-100: #f0f6ff;
  --gray-400: #9ba3b8;
  --gray-600: #5a6478;
  --accent-green: #39d353;
  --accent-orange: #f0883e;
  --accent-purple: #a78bfa;

  --font-ja: 'Noto Sans JP', sans-serif;
  --font-en: 'Outfit', sans-serif;

  --header-h: 68px;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --shadow-card: 0 4px 24px rgba(0,0,0,0.35);
  --shadow-hover: 0 12px 40px rgba(69,182,254,0.25);
  --transition: 0.3s cubic-bezier(.4,0,.2,1);
}

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

body {
  font-family: var(--font-ja);
  background: var(--dark);
  color: var(--white);
  line-height: 1.7;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
ul, ol { list-style: none; }

/* ---- Scrollbar ---- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--dark); }
::-webkit-scrollbar-thumb { background: var(--sky-dark); border-radius: 3px; }

/* ===================================================
   HEADER
   =================================================== */
#site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-h);
  z-index: 1000;
  background: rgba(13,17,23,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(69,182,254,0.15);
  transition: background var(--transition), box-shadow var(--transition);
}
#site-header.scrolled {
  background: rgba(13,17,23,0.97);
  box-shadow: 0 2px 20px rgba(0,0,0,0.4);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
}

.header-logo { display: flex; align-items: center; }
.logo-img { height: 44px; width: auto; object-fit: contain; transition: transform var(--transition); }
.header-logo:hover .logo-img { transform: scale(1.05); }

.header-nav ul {
  display: flex;
  gap: 8px;
}
.header-nav a {
  font-family: var(--font-en);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--gray-400);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
  white-space: nowrap;
}
.header-nav a:hover {
  color: var(--sky);
  background: rgba(69,182,254,0.1);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-sm);
}
.hamburger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile Nav */
@media (max-width: 768px) {
  .hamburger { display: flex; }
  .header-nav {
    position: fixed;
    top: var(--header-h); left: 0; right: 0;
    background: rgba(13,17,23,0.98);
    border-bottom: 1px solid var(--dark-border);
    padding: 16px 24px;
    transform: translateY(-110%);
    opacity: 0;
    transition: transform 0.35s ease, opacity 0.35s ease;
    pointer-events: none;
  }
  .header-nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }
  .header-nav ul { flex-direction: column; gap: 4px; }
  .header-nav a { font-size: 0.95rem; padding: 10px 16px; }
}

/* ===================================================
   HERO
   =================================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
  padding-top: var(--header-h);
  background: radial-gradient(ellipse 80% 80% at 50% 20%, rgba(69,182,254,0.18) 0%, transparent 70%),
              linear-gradient(180deg, #0d1117 0%, #0a1628 50%, #0d1117 100%);
}

.hero-bg-overlay {
  position: absolute; inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%2345b6fe' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

/* Particles */
.hero-particles { position: absolute; inset: 0; pointer-events: none; }
.particle {
  position: absolute;
  border-radius: 50%;
  background: radial-gradient(circle, var(--sky) 0%, transparent 70%);
  opacity: 0.3;
  animation: float 8s ease-in-out infinite;
}
.p1 { width: 300px; height: 300px; top: 10%; left: -10%; animation-delay: 0s; }
.p2 { width: 200px; height: 200px; top: 60%; right: -5%; animation-delay: 2s; }
.p3 { width: 150px; height: 150px; top: 30%; right: 20%; animation-delay: 4s; }
.p4 { width: 100px; height: 100px; bottom: 20%; left: 30%; animation-delay: 1s; }
.p5 { width: 80px; height: 80px; top: 80%; left: 10%; animation-delay: 3s; }

@keyframes float {
  0%, 100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-30px) scale(1.05); }
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  padding: 40px 24px;
}

.hero-logo-wrap {
  margin-bottom: 32px;
}
.hero-logo-img {
  width: 180px; height: auto;
  margin: 0 auto;
  border-radius: var(--radius-md);
  box-shadow: 0 0 40px rgba(69,182,254,0.4), 0 0 80px rgba(69,182,254,0.15);
  transition: transform var(--transition), box-shadow var(--transition);
}
.hero-logo-img:hover {
  transform: scale(1.05);
  box-shadow: 0 0 60px rgba(69,182,254,0.6), 0 0 100px rgba(69,182,254,0.2);
}

.hero-title {
  font-family: var(--font-ja);
  font-size: clamp(1.8rem, 5vw, 3rem);
  font-weight: 900;
  line-height: 1.3;
  background: linear-gradient(135deg, var(--white) 0%, var(--sky-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
}

.hero-subtitle {
  font-family: var(--font-en);
  font-size: 1rem;
  color: var(--sky);
  letter-spacing: 0.1em;
  margin-bottom: 40px;
  opacity: 0.85;
}

.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

.btn {
  font-family: var(--font-en);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 14px 32px;
  border-radius: 50px;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
  cursor: pointer;
  border: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-primary {
  background: linear-gradient(135deg, var(--sky) 0%, var(--sky-dark) 100%);
  color: var(--white);
  box-shadow: 0 4px 20px rgba(69,182,254,0.4);
}
.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(69,182,254,0.5);
}
.btn-secondary {
  background: transparent;
  color: var(--sky);
  border: 1.5px solid var(--sky);
}
.btn-secondary:hover {
  background: rgba(69,182,254,0.12);
  transform: translateY(-3px);
}

/* Scroll hint */
.hero-scroll-hint {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s ease-in-out infinite;
}
.scroll-arrow {
  width: 24px; height: 24px;
  border-right: 2px solid var(--sky);
  border-bottom: 2px solid var(--sky);
  transform: rotate(45deg);
  opacity: 0.6;
}
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

/* ===================================================
   SECTIONS — Common
   =================================================== */
.section {
  padding: 100px 0;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}
.section-label {
  display: inline-block;
  font-family: var(--font-en);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--sky);
  background: rgba(69,182,254,0.1);
  padding: 4px 16px;
  border-radius: 50px;
  border: 1px solid rgba(69,182,254,0.25);
  margin-bottom: 16px;
}
.section-title {
  font-family: var(--font-ja);
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 900;
  margin-bottom: 12px;
  background: linear-gradient(135deg, var(--white) 0%, var(--sky-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-subtitle {
  font-size: 0.95rem;
  color: var(--gray-400);
  margin-bottom: 4px;
}
.section-subtitle span { font-family: var(--font-en); font-size: 0.85rem; }
.section-divider {
  width: 60px; height: 3px;
  background: linear-gradient(90deg, var(--sky), var(--sky-dark));
  border-radius: 2px;
  margin: 16px auto 0;
}

/* ===================================================
   ABOUT
   =================================================== */
.about-section {
  background: linear-gradient(180deg, var(--dark) 0%, var(--dark-surface) 50%, var(--dark) 100%);
}
.about-content {
  display: flex;
  gap: 56px;
  align-items: center;
  max-width: 900px;
  margin: 0 auto;
}
.about-icon { flex-shrink: 0; }
.about-logo {
  width: 140px; height: auto;
  border-radius: var(--radius-md);
  box-shadow: 0 0 30px rgba(69,182,254,0.3);
}
.about-text { flex: 1; }
.about-main-text {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 6px;
  line-height: 1.8;
}
.about-main-text-en {
  font-family: var(--font-en);
  font-size: 0.85rem;
  color: var(--sky);
  margin-bottom: 20px;
  opacity: 0.85;
}
.about-sub-text {
  font-size: 0.95rem;
  color: var(--gray-400);
  line-height: 1.8;
  margin-bottom: 4px;
}
.about-sub-text-en {
  font-family: var(--font-en);
  font-size: 0.8rem;
  color: var(--gray-600);
  font-style: italic;
}

@media (max-width: 640px) {
  .about-content { flex-direction: column; gap: 32px; text-align: center; }
  .about-logo { width: 100px; }
}

/* ===================================================
   APPS
   =================================================== */
.apps-section {
  background: var(--dark);
}

.platform-block { margin-bottom: 16px; }

.platform-title {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-ja);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--sky);
  margin-bottom: 28px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--dark-border);
}
.ios-title { color: var(--accent-purple); }

.apps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 20px;
}

.app-card {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.app-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(69,182,254,0.4);
}

.app-card-link {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 20px 16px;
  gap: 12px;
}

.app-icon-wrap {
  width: 80px; height: 80px;
  margin: 0 auto;
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0,0,0,0.4);
  flex-shrink: 0;
  background: var(--dark-surface);
}
.app-icon {
  width: 100%; height: 100%;
  object-fit: cover;
}

.app-info {
  text-align: center;
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}
.app-name {
  font-size: 0.82rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--white);
}
.app-badge {
  display: inline-block;
  font-family: var(--font-en);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 50px;
  letter-spacing: 0.05em;
}
.badge-android {
  background: rgba(57,211,83,0.15);
  color: var(--accent-green);
  border: 1px solid rgba(57,211,83,0.3);
}
.badge-ios {
  background: rgba(167,139,250,0.15);
  color: var(--accent-purple);
  border: 1px solid rgba(167,139,250,0.3);
}

/* ===================================================
   PRIVACY
   =================================================== */
.privacy-section {
  background: linear-gradient(180deg, var(--dark) 0%, var(--dark-surface) 100%);
}
.privacy-content {
  max-width: 800px;
  margin: 0 auto;
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius-lg);
  padding: 48px;
}
.privacy-content p {
  font-size: 0.92rem;
  color: var(--gray-400);
  margin-bottom: 16px;
  line-height: 1.9;
}
.privacy-content em {
  font-family: var(--font-en);
  font-size: 0.82rem;
  color: var(--gray-600);
}
.privacy-content h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--sky);
  margin: 28px 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(69,182,254,0.2);
}
.privacy-content ol, .privacy-content ul {
  list-style: none;
  margin-bottom: 16px;
}
.privacy-content ol li, .privacy-content ul li {
  font-size: 0.9rem;
  color: var(--gray-400);
  line-height: 1.9;
  margin-bottom: 12px;
  padding-left: 20px;
  position: relative;
}
.privacy-content ol li::before {
  content: counter(list-item) '.';
  counter-increment: list-item;
  position: absolute; left: 0;
  color: var(--sky);
  font-weight: 700;
}
.privacy-content ul li::before {
  content: '▸';
  position: absolute; left: 0;
  color: var(--sky);
}
.privacy-content ol { counter-reset: list-item; }
.privacy-content strong { color: var(--white); font-weight: 700; }

.contact-box {
  margin-top: 20px;
  padding: 20px;
  background: rgba(69,182,254,0.08);
  border: 1px solid rgba(69,182,254,0.2);
  border-radius: var(--radius-md);
  text-align: center;
}
.contact-name {
  font-weight: 700;
  font-size: 1rem;
  color: var(--white) !important;
  margin-bottom: 8px !important;
}
.contact-email {
  font-family: var(--font-en);
  font-size: 0.95rem;
  color: var(--sky);
  text-decoration: underline;
  transition: color var(--transition);
}
.contact-email:hover { color: var(--sky-light); }

.privacy-revised {
  font-family: var(--font-en);
  font-size: 0.78rem;
  color: var(--gray-600);
  margin-top: 12px !important;
}

/* Privacy items */
.privacy-item {
  background: rgba(69,182,254,0.05);
  border: 1px solid rgba(69,182,254,0.15);
  border-left: 3px solid var(--sky);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin-bottom: 16px;
}
.privacy-item-title {
  font-size: 0.95rem !important;
  font-weight: 700 !important;
  color: var(--white) !important;
  margin-bottom: 4px !important;
}
.privacy-item-note {
  font-size: 0.78rem !important;
  color: var(--sky) !important;
  margin-bottom: 12px !important;
  font-style: italic;
}
.privacy-link {
  color: var(--sky);
  text-decoration: underline;
  transition: color var(--transition);
}
.privacy-link:hover { color: var(--sky-light); }


@media (max-width: 640px) {
  .privacy-content { padding: 28px 20px; }
}

/* ===================================================
   LINKS
   =================================================== */
.links-section { background: var(--dark); }

.links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
  max-width: 900px;
  margin: 0 auto;
}

.link-card {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.link-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(69,182,254,0.4);
}
.link-icon { font-size: 2rem; flex-shrink: 0; }
.link-text { display: flex; flex-direction: column; gap: 4px; }
.link-title { font-weight: 700; font-size: 0.95rem; }
.link-url { font-family: var(--font-en); font-size: 0.75rem; color: var(--sky); opacity: 0.8; }

/* ===================================================
   FOOTER
   =================================================== */
.site-footer {
  background: var(--dark-surface);
  border-top: 1px solid var(--dark-border);
  padding: 48px 24px;
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  text-align: center;
}
.footer-logo-img { height: 40px; width: auto; object-fit: contain; opacity: 0.8; }
.footer-copy {
  font-size: 0.82rem;
  color: var(--gray-600);
  font-family: var(--font-en);
}
.footer-nav {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  justify-content: center;
}
.footer-nav a {
  font-size: 0.82rem;
  color: var(--gray-400);
  transition: color var(--transition);
}
.footer-nav a:hover { color: var(--sky); }

/* ===================================================
   ANIMATIONS
   =================================================== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  animation: fadeUp 0.8s ease forwards;
}
.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }
.delay-3 { animation-delay: 0.6s; }

@keyframes fadeUp {
  to { opacity: 1; transform: translateY(0); }
}

.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-card {
  opacity: 0;
  transform: translateY(30px) scale(0.96);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.reveal-card.visible {
  opacity: 1;
  transform: translateY(0) scale(1);
}

/* ===================================================
   RESPONSIVE
   =================================================== */
@media (max-width: 900px) {
  .apps-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
}
@media (max-width: 600px) {
  .section { padding: 64px 0; }
  .apps-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .links-grid { grid-template-columns: 1fr; }
  .hero-title { font-size: 1.6rem; }
}