/* ========================================
   SORAMUSUBI FPV Drone School - Stylesheet
   White / Black / Gray minimal design
   Font: Zen Kaku Gothic New
   ======================================== */

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

:root {
  --color-black: #111111;
  --color-dark: #222222;
  --color-gray: #555555;
  --color-gray-light: #888888;
  --color-gray-border: #e0e0e0;
  --color-gray-bg: #f5f5f5;
  --color-white: #ffffff;
  --font-main: "Zen Kaku Gothic New", "Hiragino Kaku Gothic ProN", sans-serif;
  --radius: 0px;
  --radius-sm: 0px;
  --shadow: none;
  --shadow-hover: 0 2px 16px rgba(0, 0, 0, 0.06);
  --transition: 0.3s ease;
  --container: 1280px;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  font-size: 16px;
}

body {
  font-family: var(--font-main);
  font-weight: 400;
  color: var(--color-gray);
  background: var(--color-white);
  line-height: 2;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

a {
  color: var(--color-black);
  text-decoration: none;
  transition: opacity var(--transition);
}

a:hover {
  opacity: 0.6;
}

ul {
  list-style: none;
}

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

.pc-only {
  display: none;
}

.sp-only {
  display: inline;
}

@media (min-width: 768px) {
  .pc-only {
    display: inline;
  }

  .sp-only {
    display: none;
  }
}

/* ========================================
   Header
   ======================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition);
}

.header.scrolled {
  border-bottom-color: var(--color-gray-border);
}

.header-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 0px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  gap: 0;
}

.logo-main {
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--color-black);
  letter-spacing: 0.08em;
  line-height: 1.2;
  margin-bottom: 3px;
}

.logo-sub {
  font-size: 0.6rem;
  color: var(--color-gray-light);
  letter-spacing: 0.08em;
  line-height: 1.2;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-list a {
  color: var(--color-gray);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.04em;
}

.nav-list a:hover {
  opacity: 0.6;
}

.nav-cta {
  background: var(--color-black) !important;
  color: var(--color-white) !important;
  padding: 8px 20px !important;
  border-radius: 0 !important;
  font-weight: 700 !important;
  letter-spacing: 0.06em !important;
}

.nav-cta:hover {
  background: var(--color-dark) !important;
  color: var(--color-white) !important;
  opacity: 1 !important;
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  z-index: 1001;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 1px;
  background: var(--color-black);
  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);
}

@media (max-width: 960px) {
  .header-inner {
    padding: 0 24px;
  }

  .hamburger {
    display: flex;
  }

  .nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100dvh;
    background: var(--color-white);
    padding: 100px 32px 40px;
    transition: right var(--transition);
    box-shadow: -4px 0 20px rgba(0, 0, 0, 0.05);
  }

  .nav.open {
    right: 0;
  }

  .nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
  }

  .nav-list li {
    width: 100%;
  }

  .nav-list a {
    display: block;
    padding: 14px 0;
    font-size: 0.9rem;
    border-bottom: 1px solid var(--color-gray-border);
  }

  .nav-cta {
    margin-top: 20px;
    text-align: center;
    border-bottom: none !important;
    padding: 12px 20px !important;
  }
}

/* Mobile overlay */
.nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.2);
  z-index: 999;
}

.nav-overlay.active {
  display: block;
}

/* ========================================
   Buttons
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 16px 40px;
  font-size: 0.9rem;
  font-weight: 700;
  font-family: var(--font-main);
  text-decoration: none;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
  letter-spacing: 0.06em;
}

.btn-primary {
  background: var(--color-black);
  color: var(--color-white);
}

.btn-primary:hover {
  background: var(--color-dark);
  color: var(--color-white);
  opacity: 0.85;
}

.btn-secondary {
  background: transparent;
  color: var(--color-black);
  border: 1px solid var(--color-black);
}

.btn-secondary:hover {
  background: var(--color-black);
  color: var(--color-white);
  opacity: 1;
}

.btn-large {
  padding: 20px 48px;
  font-size: 0.95rem;
}

/* ========================================
   Hero
   ======================================== */
.hero {
  position: relative;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 100px 24px 80px;
  background: var(--color-white);
}

.hero-inner {
  max-width: var(--container);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-text {
  text-align: left;
}

.hero-image {
  position: relative;
}

.hero-image img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  aspect-ratio: 4 / 3;
}

@media (max-width: 768px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero-text {
    text-align: center;
    order: 1;
  }

  .hero-image {
    order: 2;
  }
}

.hero-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-gray-light);
  padding: 0;
  margin-bottom: 14px;
  letter-spacing: 0.1em;
}

.hero-title {
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  font-weight: 700;
  color: var(--color-black);
  line-height: 1.7;
  margin-bottom: 24px;
  letter-spacing: 0.04em;
}

.hero-title .highlight {
  color: var(--color-black);
}

.hero-subtitle {
  font-size: clamp(0.88rem, 2vw, 1rem);
  color: var(--color-gray);
  font-weight: 400;
  margin-bottom: 32px;
  line-height: 2;
}

.hero-desc {
  font-size: 0.88rem;
  color: var(--color-gray-light);
  margin-bottom: 12px;
  line-height: 2;
}

.hero-price {
  margin-top: 32px;
  padding: 20px 32px;
  background: var(--color-gray-bg);
  display: inline-block;
  font-size: 0.88rem;
  color: var(--color-dark);
  line-height: 1.8;
}

.hero-price strong {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-black);
}

.hero-buttons {
  margin-top: 40px;
  display: flex;
  gap: 16px;
  justify-content: flex-start;
  flex-wrap: wrap;
}

@media (max-width: 768px) {
  .hero-buttons {
    justify-content: center;
  }
}

.hero-scroll {
  position: absolute;
  bottom: -20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  z-index: 100;
}

.hero-scroll span {
  font-size: 0.65rem;
  color: var(--color-gray-light);
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.hero-scroll-line {
  width: 1px;
  height: 40px;
  background: var(--color-gray-border);
  position: relative;
  overflow: hidden;
}

.hero-scroll-line::after {
  content: "";
  position: absolute;
  top: -100%;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--color-black);
  animation: scrollLine 2s ease-in-out infinite;
}

@keyframes scrollLine {
  0% {
    top: -100%;
  }

  100% {
    top: 100%;
  }
}

/* ========================================
   Sections (common)
   ======================================== */
.section {
  padding: 100px 0;
}

.section:nth-child(even) {
  background: var(--color-gray-bg);
}

.section-label {
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--color-gray-light);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 16px;
  text-align: center;
}

.section-title {
  font-size: clamp(1.3rem, 3vw, 1.7rem);
  font-weight: 700;
  color: var(--color-black);
  text-align: center;
  margin-bottom: 56px;
  line-height: 1.7;
  letter-spacing: 0.04em;
}

/* ========================================
   About
   ======================================== */
.about-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}

.about-image img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.about-content {
  max-width: none;
  margin: 0;
  text-align: left;
}

.about-content p {
  margin-bottom: 24px;
  font-size: 0.9rem;
  line-height: 2.2;
  color: var(--color-gray);
}

@media (max-width: 768px) {
  .about-layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .about-content {
    text-align: center;
  }
}

/* ========================================
   Problems
   ======================================== */
.problems-list {
  max-width: 720px;
  margin: 0 auto 48px;
}

.problems-list li {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-gray-border);
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--color-dark);
}

.check-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  background: var(--color-black);
  border-radius: 50%;
  position: relative;
  margin-top: 4px;
}

.check-icon::after {
  content: "";
  position: absolute;
  top: 5px;
  left: 6px;
  width: 5px;
  height: 9px;
  border: solid var(--color-white);
  border-width: 0 1.5px 1.5px 0;
  transform: rotate(45deg);
}

.problems-cta {
  text-align: center;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-dark);
  line-height: 2;
}

.problems-cta a {
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
}

/* ========================================
   Reasons
   ======================================== */
.reasons-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1px;
  background: var(--color-gray-border);
  border: 1px solid var(--color-gray-border);
}

.reason-card {
  background: var(--color-white);
  padding: 40px 32px;
  transition: background var(--transition);
}

.reason-card:hover {
  background: var(--color-gray-bg);
}

.reason-num {
  font-size: 2.7rem;
  font-weight: 700;
  color: var(--color-gray-light);
  letter-spacing: 0.1em;
  line-height: 1em;
  margin-bottom: 7px;
  display: block;
}

.reason-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-black);
  margin-bottom: 12px;
  line-height: 1.6;
}

.reason-card p {
  font-size: 0.85rem;
  color: var(--color-gray);
  line-height: 2;
}

/* ========================================
   Lessons
   ======================================== */
.lessons-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 32px;
  margin-bottom: 48px;
}

.lesson-card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-border);
  padding: 36px 28px;
  border-radius: 3px;
  transition: border-color var(--transition);
}

.lesson-card:hover {
  border-color: var(--color-black);
}

.lesson-icon {
  width: 60px;
  height: 60px;
  color: var(--color-black);
  margin-bottom: 20px;
}

.lesson-icon svg {
  width: 100%;
  height: 100%;
}

.lesson-card h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-black);
  margin-bottom: 20px;
  letter-spacing: 0.04em;
}

.lesson-card ul {
  list-style: none;
}

.lesson-card li {
  font-size: 0.82rem;
  color: var(--color-gray);
  padding: 4px 0;
  padding-left: 16px;
  position: relative;
  line-height: 1.8;
}

.lesson-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--color-gray-light);
}

.lessons-note {
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-gray-light);
  line-height: 2;
}

/* ========================================
   Trial Lesson
   ======================================== */
.trial-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 24px;
}

.trial-item {
  text-align: center;
  padding: 36px 20px;
  background: var(--color-white);
  border: 1px solid var(--color-gray-border);
  border-radius: 3px;
}

.trial-num {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--color-black);
  background: transparent;
  color: var(--color-black);
  font-size: 0.9rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}

.trial-item h3 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-black);
  margin-bottom: 10px;
}

.trial-item p {
  font-size: 0.82rem;
  color: var(--color-gray);
  line-height: 1.8;
}

/* ========================================
   Flow
   ======================================== */
.flow-steps {
  max-width: 1024px;
  margin: 0 auto;
  position: relative;
}

.flow-steps::before {
  content: "";
  position: absolute;
  left: 19px;
  top: 36px;
  bottom: 36px;
  width: 1px;
  background: var(--color-gray-border);
}

.flow-step {
  display: flex;
  gap: 24px;
  align-items: center;
  padding: 24px 0;
  position: relative;
}

.flow-step-num {
  flex-shrink: 0;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  border: 2px solid var(--color-black);
  background: var(--color-white);
  color: var(--color-black);
  font-size: 0.7em;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  letter-spacing: 0.02em;
  position: relative;
  z-index: 1;
}

.flow-step h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-black);
  margin-bottom: 6px;
}

.flow-step p {
  font-size: 0.85rem;
  color: var(--color-gray);
  line-height: 1.9;
}

/* ========================================
   Pricing
   ======================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
  margin-bottom: 48px;
}

.pricing-card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-border);
  padding: 48px 36px;
  text-align: center;
}

.pricing-card--trial {
  border: 2px solid var(--color-black);
  position: relative;
}

.pricing-card--trial::before {
  content: "おすすめ";
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-black);
  color: var(--color-white);
  font-size: 0.7rem;
  font-weight: 700;
  padding: 4px 16px;
  letter-spacing: 0.06em;
}

.pricing-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-black);
  margin-bottom: 28px;
  letter-spacing: 0.06em;
}

.pricing-prices {
  margin-bottom: 32px;
}

.pricing-item {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 8px;
  padding: 8px 0;
}

.pricing-label {
  font-size: 0.85rem;
  color: var(--color-gray);
  min-width: 50px;
  text-align: right;
}

.pricing-amount {
  font-size: 1rem;
  color: var(--color-dark);
}

.pricing-amount strong {
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--color-black);
}

.pricing-duration {
  font-size: 0.95rem;
  color: var(--color-gray);
  margin-bottom: 16px;
}

.pricing-notes {
  list-style: none;
  max-width: 560px;
  margin: 32px auto 0;
  padding: 0;
  text-align: left;
}

.pricing-notes li {
  font-size: 0.82rem;
  color: var(--color-gray);
  line-height: 2;
  padding-left: 1em;
  text-indent: -1em;
}

.pricing-notes li::before {
  content: "※";
}

.pricing-features {
  text-align: left;
  margin-bottom: 24px;
}

.pricing-features li {
  padding: 12px 0;
  padding-left: 28px;
  position: relative;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--color-gray-border);
  color: var(--color-dark);
}

.pricing-features li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 17px;
  width: 14px;
  height: 14px;
  background: var(--color-black);
  border-radius: 50%;
}

.pricing-features li::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 20px;
  width: 4px;
  height: 7px;
  border: solid var(--color-white);
  border-width: 0 1.5px 1.5px 0;
  transform: rotate(45deg);
}

.pricing-note {
  font-size: 0.78rem;
  color: var(--color-gray-light);
  margin-top: 12px;
}

.pricing-supplement {
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-gray);
  line-height: 2;
}

/* ========================================
   Target
   ======================================== */
.target-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 12px;
  max-width: 800px;
  margin: 0 auto 36px;
}

.target-item {
  background: var(--color-white);
  border: 1px solid var(--color-gray-border);
  padding: 18px 24px 18px 48px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-dark);
  position: relative;
}

.target-item::before {
  content: "—";
  position: absolute;
  left: 20px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-gray-light);
  font-size: 0.8rem;
}

.target-item::after {
  display: none;
}

.target-note {
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-gray-light);
}

/* ========================================
   Instructor
   ======================================== */
.instructor-card {
  display: flex;
  gap: 40px;
  align-items: flex-start;
  max-width: 860px;
  margin: 0 auto;
  background: var(--color-white);
  border: 1px solid var(--color-gray-border);
  padding: 48px;
}

.instructor-photo {
  flex-shrink: 0;
}

.instructor-photo-placeholder {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: var(--color-gray-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-gray-light);
}

.instructor-photo-placeholder svg {
  width: 70px;
  height: 70px;
}

.instructor-name {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-black);
  margin-bottom: 4px;
}

.instructor-role {
  font-size: 0.8rem;
  color: var(--color-gray-light);
  margin-bottom: 20px;
}

.instructor-info p {
  font-size: 0.88rem;
  line-height: 2;
  margin-bottom: 12px;
  color: var(--color-gray);
}

.instructor-achievements {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--color-gray-border);
}

.instructor-achievements li {
  font-size: 0.82rem;
  color: var(--color-gray);
  padding: 3px 0 3px 16px;
  position: relative;
}

.instructor-achievements li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--color-gray-light);
}

@media (max-width: 640px) {
  .instructor-card {
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 36px 24px;
  }

  .instructor-achievements {
    text-align: left;
  }
}

/* ========================================
   FAQ
   ======================================== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--color-gray-border);
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 0;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-dark);
  cursor: pointer;
  list-style: none;
  gap: 16px;
  line-height: 1.7;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "";
  flex-shrink: 0;
  width: 10px;
  height: 10px;
  border-right: 1px solid var(--color-gray-light);
  border-bottom: 1px solid var(--color-gray-light);
  transform: rotate(45deg);
  transition: transform var(--transition);
  margin-top: -4px;
}

.faq-item[open] summary::after {
  transform: rotate(-135deg);
  margin-top: 4px;
}

.faq-answer {
  padding: 0 0 22px;
}

.faq-answer p {
  font-size: 0.85rem;
  color: var(--color-gray);
  line-height: 2;
}

/* ========================================
   Contact CTA
   ======================================== */
/* ========================================
   Access
   ======================================== */
.access-layout {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 60px;
  align-items: flex-start;
}

@media (max-width: 960px) {
  .access-layout {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

.access-info {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.access-info-item h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-black);
  margin-bottom: 12px;
  letter-spacing: 0.04em;
  border-left: 3px solid var(--color-black);
  padding-left: 12px;
  line-height: 1.2;
}

.access-info-item p {
  font-size: 0.9rem;
  color: var(--color-gray);
  line-height: 1.8;
}

.access-map {
  width: 100%;
}

.map-container {
  position: relative;
  width: 100%;
  padding-top: 66.66%; /* 3:2 Aspect Ratio */
  background: var(--color-gray-bg);
}

.map-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.contact {
  background: var(--color-black) !important;
  color: var(--color-white);
  text-align: center;
}

.contact .section-label {
  color: var(--color-gray-light);
}

.contact .section-title {
  color: var(--color-white);
}

.contact-text {
  max-width: 720px;
  margin: 0 auto 48px;
}

.contact-text p {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 16px;
  line-height: 2;
}

.contact-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.contact .btn-primary {
  background: var(--color-white);
  color: var(--color-black);
}

.contact .btn-primary:hover {
  background: var(--color-gray-bg);
  color: var(--color-black);
  opacity: 1;
}

.contact .btn-secondary {
  color: var(--color-white);
  border-color: rgba(255, 255, 255, 0.3);
}

.contact .btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-white);
  border-color: rgba(255, 255, 255, 0.6);
  opacity: 1;
}

/* ========================================
   Footer
   ======================================== */
.footer {
  background: var(--color-black);
  padding: 48px 0 32px;
  color: rgba(255, 255, 255, 0.4);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 40px;
  margin-bottom: 32px;
}

.footer-logo {
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-white);
  display: block;
  letter-spacing: 0.08em;
}

.footer-logo-sub {
  font-size: 0.65rem;
  color: rgba(255, 255, 255, 0.4);
  display: block;
  margin-top: 4px;
}

.footer-address {
  font-size: 0.75rem;
  margin-top: 8px;
}

.footer-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
}

.footer-nav a {
  color: rgba(255, 255, 255, 0.4);
  font-size: 0.78rem;
}

.footer-nav a:hover {
  color: var(--color-white);
  opacity: 1;
}

.footer-copy {
  font-size: 0.7rem;
  text-align: center;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  letter-spacing: 0.04em;
}

@media (max-width: 640px) {
  .footer-inner {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .footer-nav ul {
    justify-content: center;
  }
}

/* ========================================
   Back to Top
   ======================================== */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  border-radius: 0;
  background: var(--color-black);
  color: var(--color-white);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition);
  z-index: 100;
}

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

.back-to-top:hover {
  opacity: 0.7;
}

.back-to-top svg {
  width: 18px;
  height: 18px;
}

/* ========================================
   Scroll animations
   ======================================== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 640px) {
  .section {
    padding: 72px 0;
  }

  .section-title {
    margin-bottom: 40px;
  }

  .hero {
    padding: 100px 20px 60px;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .hero-buttons .btn {
    width: 100%;
    max-width: 300px;
  }

  .hero-scroll {
    display: none;
  }

  .reasons-grid {
    grid-template-columns: 1fr;
  }

  .lessons-grid {
    grid-template-columns: 1fr;
  }

  .pricing-grid {
    grid-template-columns: 1fr;
  }

  .trial-grid {
    grid-template-columns: 1fr 1fr;
  }

  .target-grid {
    grid-template-columns: 1fr;
  }

  .contact-buttons {
    flex-direction: column;
    align-items: center;
  }

  .contact-buttons .btn {
    width: 100%;
    max-width: 320px;
  }

  .hero-desc {
    text-align: left;
  }

  .about-content {
    text-align: left;
  }
}

@media (max-width: 400px) {
  .trial-grid {
    grid-template-columns: 1fr;
  }
}

/* ========================================
   PC font size boost
   ======================================== */
@media (min-width: 768px) {
  html {
    font-size: 17px;
  }

  .hero-title {
    font-size: 2.4rem;
  }

  .hero-subtitle {
    font-size: 1.1rem;
  }

  .hero-desc {
    font-size: 0.95rem;
  }

  .hero-price {
    font-size: 0.95rem;
  }

  .hero-price strong {
    font-size: 1.4rem;
  }

  .section-title {
    font-size: 1.8rem;
  }

  .about-content p {
    font-size: 1rem;
  }

  .problems-list li {
    font-size: 1rem;
  }

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

  .reason-card p {
    font-size: 0.92rem;
  }

  .lesson-card h3 {
    font-size: 1.05rem;
  }

  .lesson-card li {
    font-size: 0.9rem;
  }

  .trial-item h3 {
    font-size: 1rem;
  }

  .trial-item p {
    font-size: 0.9rem;
  }

  .flow-step h3 {
    font-size: 1.05rem;
  }

  .flow-step p {
    font-size: 0.92rem;
  }

  .pricing-card h3 {
    font-size: 1.2rem;
  }

  .pricing-features li {
    font-size: 1rem;
  }

  .target-item {
    font-size: 1rem;
  }

  .instructor-info p {
    font-size: 0.95rem;
  }

  .faq-item summary {
    font-size: 1rem;
  }

  .faq-answer p {
    font-size: 0.92rem;
  }

  .contact-text p {
    font-size: 1rem;
  }

  .btn {
    font-size: 0.95rem;
  }

  .btn-large {
    font-size: 1rem;
  }

  .nav-list a {
    font-size: 0.85rem;
  }

  .footer-nav a {
    font-size: 0.82rem;
  }
}