/* ==========================================
   AKANUKELAB - Main Stylesheet
   Design Inspired by 45r.jp - Dark, Sophisticated
   ========================================== */

/* ==========================================
   CSS Variables
   ========================================== */
:root {
  /* Colors - Dark, Sophisticated Palette */
  --color-bg-primary: #0a0a0a;
  --color-bg-secondary: #111111;
  --color-bg-tertiary: #1a1a1a;
  --color-bg-card: #141414;
  
  --color-text-primary: #ffffff;
  --color-text-secondary: #b8b8b8;
  --color-text-muted: #666666;
  
  --color-accent: #c9a96e;
  --color-accent-light: #e0c99a;
  --color-accent-dark: #a68b4d;
  
  --color-line-green: #06c755;
  
  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-light: rgba(255, 255, 255, 0.15);
  
  /* Typography */
  --font-primary: 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', sans-serif;
  --font-accent: 'Cormorant Garamond', serif;
  --font-english: 'Inter', sans-serif;
  
  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;
  --space-xxl: 10rem;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.4s ease;
  --transition-slow: 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  
  /* Container */
  --container-max: 1200px;
  --container-narrow: 800px;
}

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

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

body {
  font-family: var(--font-primary);
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  line-height: 1.8;
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition-fast);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

ul, ol {
  list-style: none;
}

/* ==========================================
   Typography
   ========================================== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 400;
  line-height: 1.4;
  letter-spacing: 0.05em;
}

.heading-xl {
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-weight: 300;
  letter-spacing: 0.1em;
}

.heading-lg {
  font-size: clamp(2rem, 4vw, 3.5rem);
  font-weight: 300;
  letter-spacing: 0.08em;
}

.heading-md {
  font-size: clamp(1.5rem, 3vw, 2.5rem);
  font-weight: 400;
  letter-spacing: 0.06em;
}

.heading-sm {
  font-size: clamp(1.25rem, 2vw, 1.75rem);
  font-weight: 400;
  letter-spacing: 0.04em;
}

.text-lg {
  font-size: 1.125rem;
  line-height: 2;
}

.text-md {
  font-size: 1rem;
  line-height: 1.9;
}

.text-sm {
  font-size: 0.875rem;
  line-height: 1.8;
}

.text-xs {
  font-size: 0.75rem;
  line-height: 1.7;
}

.text-accent {
  color: var(--color-accent);
}

.text-muted {
  color: var(--color-text-secondary);
}

.font-english {
  font-family: var(--font-english);
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.font-serif {
  font-family: var(--font-accent);
  font-style: italic;
}

/* ==========================================
   Layout
   ========================================== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.container--narrow {
  max-width: var(--container-narrow);
}

.section {
  padding: var(--space-xxl) 0;
  position: relative;
}

.section--dark {
  background-color: var(--color-bg-secondary);
}

.section--darker {
  background-color: var(--color-bg-tertiary);
}

/* ==========================================
   Header
   ========================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--space-md) 0;
  transition: var(--transition-normal);
}

.header--scrolled {
  background-color: rgba(10, 10, 10, 0.95);
  backdrop-filter: blur(20px);
  padding: var(--space-sm) 0;
}

.header__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.header__logo {
  font-family: var(--font-english);
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--color-text-primary);
}

.header__logo span {
  color: var(--color-accent);
}

.header__nav {
  display: none;
}

@media (min-width: 1024px) {
  .header__nav {
    display: flex;
    gap: var(--space-lg);
  }
}

.header__nav-link {
  font-size: 0.75rem;
  font-family: var(--font-english);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  position: relative;
}

.header__nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-accent);
  transition: var(--transition-normal);
}

.header__nav-link:hover {
  color: var(--color-text-primary);
}

.header__nav-link:hover::after {
  width: 100%;
}

.header__cta {
  display: none;
}

@media (min-width: 768px) {
  .header__cta {
    display: block;
  }
}

.header__menu-btn {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 8px;
}

@media (min-width: 1024px) {
  .header__menu-btn {
    display: none;
  }
}

.header__menu-btn span {
  display: block;
  width: 24px;
  height: 1px;
  background-color: var(--color-text-primary);
  transition: var(--transition-fast);
}

/* Mobile Navigation */
.mobile-nav {
  position: fixed;
  inset: 0;
  background-color: var(--color-bg-primary);
  z-index: 999;
  padding: var(--space-xxl) var(--space-md);
  transform: translateX(100%);
  transition: var(--transition-slow);
}

.mobile-nav--open {
  transform: translateX(0);
}

.mobile-nav__close {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  font-size: 1.5rem;
  color: var(--color-text-primary);
}

.mobile-nav__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.mobile-nav__link {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  display: block;
  padding: var(--space-xs) 0;
  border-bottom: 1px solid var(--color-border);
}

.mobile-nav__link:hover {
  color: var(--color-text-primary);
}

/* ==========================================
   Buttons
   ========================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: 1rem 2.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  border-radius: 0;
  transition: var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.btn--primary {
  background-color: var(--color-accent);
  color: var(--color-bg-primary);
}

.btn--primary:hover {
  background-color: var(--color-accent-light);
}

.btn--outline {
  background-color: transparent;
  border: 1px solid var(--color-border-light);
  color: var(--color-text-primary);
}

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

.btn--line {
  background-color: var(--color-line-green);
  color: #ffffff;
}

.btn--line:hover {
  background-color: #05a847;
}

.btn--lg {
  padding: 1.25rem 3rem;
  font-size: 1rem;
}

.btn--sm {
  padding: 0.75rem 1.5rem;
  font-size: 0.75rem;
}

.btn--full {
  width: 100%;
}

/* ==========================================
   Hero Section
   ========================================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding: var(--space-xxl) 0;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.hero__bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(10, 10, 10, 0.3),
    rgba(10, 10, 10, 0.8) 50%,
    rgba(10, 10, 10, 1)
  );
}

.hero__bg-pattern {
  position: absolute;
  inset: 0;
  opacity: 0.03;
  background-image: 
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 80px 80px;
  animation: patternMove 20s linear infinite;
}

.hero__bg-gradient {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, rgba(201, 169, 110, 0.05) 0%, transparent 70%);
  animation: gradientPulse 8s ease-in-out infinite;
}

@keyframes gradientPulse {
  0%, 100% { opacity: 0.5; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.1); }
}

/* Hero Decorative Elements */
.hero__deco {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero__deco-line {
  position: absolute;
  width: 1px;
  height: 30vh;
  background: linear-gradient(to bottom, transparent, var(--color-accent), transparent);
  opacity: 0.3;
}

.hero__deco-line--left {
  left: 10%;
  top: 20%;
  animation: decoLineFloat 6s ease-in-out infinite;
}

.hero__deco-line--right {
  right: 10%;
  top: 30%;
  animation: decoLineFloat 6s ease-in-out infinite 3s;
}

@keyframes decoLineFloat {
  0%, 100% { transform: translateY(0); opacity: 0.3; }
  50% { transform: translateY(20px); opacity: 0.6; }
}

.hero__deco-text {
  position: absolute;
  right: var(--space-lg);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  opacity: 0.5;
}

.hero__content {
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
  padding: 0 var(--space-md);
  position: relative;
  z-index: 1;
}

.hero__tagline {
  font-family: var(--font-english);
  font-size: 0.75rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 1s 1.8s forwards;
}

.hero__title {
  font-size: clamp(2rem, 5vw, 4rem);
  font-weight: 300;
  letter-spacing: 0.15em;
  line-height: 1.3;
  margin-bottom: var(--space-md);
}

.hero__title-line {
  display: block;
  overflow: hidden;
}

.hero__title-accent {
  display: block;
  font-family: var(--font-accent);
  font-style: italic;
  color: var(--color-accent);
  font-size: 0.8em;
  margin-top: var(--space-sm);
  opacity: 0;
  animation: fadeInUp 1s 2.2s forwards;
}

.hero__description {
  font-size: 1rem;
  color: var(--color-text-secondary);
  line-height: 2;
  margin-bottom: var(--space-lg);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero__description strong {
  color: var(--color-text-primary);
}

.hero__cta {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  align-items: center;
  margin-bottom: var(--space-xl);
}

@media (min-width: 640px) {
  .hero__cta {
    flex-direction: row;
    justify-content: center;
  }
}

/* Hero Stats */
.hero__stats {
  display: flex;
  justify-content: center;
  gap: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
  opacity: 0;
  animation: fadeInUp 1s 2.5s forwards;
}

@media (max-width: 767px) {
  .hero__stats {
    gap: var(--space-md);
    flex-wrap: wrap;
  }
}

.hero__stat {
  text-align: center;
}

.hero__stat-number {
  display: block;
  font-family: var(--font-english);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 300;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: var(--space-xs);
}

.hero__stat-label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.hero__scroll {
  position: absolute;
  bottom: var(--space-lg);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  opacity: 0;
  animation: fadeIn 1s 2.8s forwards;
}

.hero__scroll-text {
  font-family: var(--font-english);
  font-size: 0.625rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.hero__scroll-line {
  width: 1px;
  height: 60px;
  background: linear-gradient(to bottom, var(--color-accent), transparent);
  animation: scrollLine 2s infinite;
}

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

@keyframes fadeIn {
  to {
    opacity: 1;
  }
}

@keyframes scrollLine {
  0% {
    transform: scaleY(0);
    transform-origin: top;
  }
  50% {
    transform: scaleY(1);
    transform-origin: top;
  }
  51% {
    transform-origin: bottom;
  }
  100% {
    transform: scaleY(0);
    transform-origin: bottom;
  }
}

/* ==========================================
   Section Header
   ========================================== */
.section-header {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.section-header__label {
  font-family: var(--font-english);
  font-size: 0.625rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.section-header__title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 300;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-sm);
}

.section-header__subtitle {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ==========================================
   Problem Section
   ========================================== */
.problems {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

@media (min-width: 768px) {
  .problems {
    grid-template-columns: repeat(2, 1fr);
  }
}

.problem-card {
  background-color: var(--color-bg-card);
  padding: var(--space-lg);
  border: 1px solid var(--color-border);
  position: relative;
  overflow: hidden;
  transition: var(--transition-normal);
}

.problem-card:hover {
  border-color: var(--color-accent);
}

.problem-card__number {
  font-family: var(--font-english);
  font-size: 4rem;
  font-weight: 200;
  color: var(--color-accent);
  opacity: 0.2;
  position: absolute;
  top: var(--space-sm);
  right: var(--space-md);
  line-height: 1;
}

.problem-card__title {
  font-size: 1.125rem;
  font-weight: 500;
  margin-bottom: var(--space-sm);
  color: var(--color-text-primary);
}

.problem-card__text {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.9;
}

/* ==========================================
   Philosophy Section
   ========================================== */
.philosophy-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

@media (min-width: 1024px) {
  .philosophy-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.philosophy-item {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  padding: var(--space-lg);
  position: relative;
}

.philosophy-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: linear-gradient(to bottom, var(--color-accent), transparent);
}

.philosophy-item__source {
  font-family: var(--font-english);
  font-size: 0.625rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-xs);
}

.philosophy-item__title {
  font-size: 1.25rem;
  font-weight: 400;
  margin-bottom: var(--space-sm);
}

.philosophy-item__principle {
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border);
}

.philosophy-item__application {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.philosophy-item__application strong {
  color: var(--color-text-secondary);
  font-weight: 500;
}

/* ==========================================
   Roadmap Section
   ========================================== */
.roadmap {
  position: relative;
}

.roadmap__line {
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, var(--color-accent), var(--color-border));
  display: none;
}

@media (min-width: 768px) {
  .roadmap__line {
    display: block;
  }
}

.roadmap__steps {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.roadmap__step {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  position: relative;
}

@media (min-width: 768px) {
  .roadmap__step {
    flex-direction: row;
    align-items: center;
  }
  
  .roadmap__step:nth-child(even) {
    flex-direction: row-reverse;
  }
  
  .roadmap__step:nth-child(even) .roadmap__content {
    text-align: right;
  }
}

.roadmap__number {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background-color: var(--color-bg-primary);
  border: 1px solid var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-english);
  font-size: 1.25rem;
  color: var(--color-accent);
  flex-shrink: 0;
}

@media (min-width: 768px) {
  .roadmap__number {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
  }
}

.roadmap__content {
  flex: 1;
  background-color: var(--color-bg-card);
  padding: var(--space-md);
  border: 1px solid var(--color-border);
}

@media (min-width: 768px) {
  .roadmap__content {
    max-width: calc(50% - 60px);
  }
}

.roadmap__title {
  font-size: 1.125rem;
  font-weight: 500;
  margin-bottom: var(--space-xs);
}

.roadmap__text {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

/* ==========================================
   Testimonials Section
   ========================================== */
.testimonials-slider {
  overflow: hidden;
  margin: 0 calc(var(--space-md) * -1);
  padding: 0 var(--space-md);
}

.testimonials-track {
  display: flex;
  gap: var(--space-md);
  transition: var(--transition-slow);
}

.testimonial-card {
  flex: 0 0 100%;
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  padding: var(--space-lg);
  position: relative;
}

@media (min-width: 768px) {
  .testimonial-card {
    flex: 0 0 calc(50% - var(--space-sm));
  }
}

@media (min-width: 1024px) {
  .testimonial-card {
    flex: 0 0 calc(33.333% - var(--space-md) * 2 / 3);
  }
}

.testimonial-card__quote {
  font-size: 3rem;
  color: var(--color-accent);
  opacity: 0.3;
  line-height: 1;
  margin-bottom: var(--space-sm);
}

.testimonial-card__text {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.9;
  margin-bottom: var(--space-md);
}

.testimonial-card__author {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border);
}

.testimonial-card__avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background-color: var(--color-bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-english);
  font-size: 0.875rem;
  color: var(--color-accent);
}

.testimonial-card__info {
  flex: 1;
}

.testimonial-card__name {
  font-size: 0.875rem;
  font-weight: 500;
}

.testimonial-card__meta {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

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

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

.faq-item__question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md) 0;
  text-align: left;
  color: var(--color-text-primary);
  font-size: 1rem;
  font-weight: 400;
  transition: var(--transition-fast);
}

.faq-item__question:hover {
  color: var(--color-accent);
}

.faq-item__icon {
  width: 24px;
  height: 24px;
  position: relative;
  flex-shrink: 0;
}

.faq-item__icon::before,
.faq-item__icon::after {
  content: '';
  position: absolute;
  background-color: currentColor;
  transition: var(--transition-fast);
}

.faq-item__icon::before {
  width: 12px;
  height: 1px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.faq-item__icon::after {
  width: 1px;
  height: 12px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.faq-item--open .faq-item__icon::after {
  transform: translate(-50%, -50%) rotate(90deg);
  opacity: 0;
}

.faq-item__answer {
  max-height: 0;
  overflow: hidden;
  transition: var(--transition-normal);
}

.faq-item--open .faq-item__answer {
  max-height: 500px;
}

.faq-item__answer-inner {
  padding-bottom: var(--space-md);
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.9;
}

/* ==========================================
   CTA Section
   ========================================== */
.cta-section {
  background: linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-bg-tertiary) 100%);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(201, 169, 110, 0.03) 0%, transparent 50%);
  animation: rotate 60s linear infinite;
}

@keyframes rotate {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

.cta-section__content {
  position: relative;
  z-index: 1;
}

.cta-section__title {
  font-size: clamp(1.5rem, 3vw, 2.5rem);
  font-weight: 300;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-md);
}

.cta-section__text {
  font-size: 1rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-lg);
}

.cta-section__buttons {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  align-items: center;
}

@media (min-width: 640px) {
  .cta-section__buttons {
    flex-direction: row;
    justify-content: center;
  }
}

/* ==========================================
   Footer
   ========================================== */
.footer {
  background-color: var(--color-bg-primary);
  padding: var(--space-xl) 0 var(--space-md);
  border-top: 1px solid var(--color-border);
}

.footer__top {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

@media (min-width: 768px) {
  .footer__top {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }
}

.footer__brand {
  max-width: 300px;
}

.footer__logo {
  font-family: var(--font-english);
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  margin-bottom: var(--space-md);
}

.footer__logo span {
  color: var(--color-accent);
}

.footer__tagline {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.footer__nav-title {
  font-family: var(--font-english);
  font-size: 0.625rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
}

.footer__nav-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer__nav-link {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.footer__nav-link:hover {
  color: var(--color-text-primary);
}

.footer__bottom {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  align-items: center;
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
}

@media (min-width: 768px) {
  .footer__bottom {
    flex-direction: row;
    justify-content: space-between;
  }
}

.footer__copyright {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.footer__legal {
  display: flex;
  gap: var(--space-md);
}

.footer__legal-link {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.footer__legal-link:hover {
  color: var(--color-text-secondary);
}

/* ==========================================
   Fixed LINE Button
   ========================================== */
.line-fixed {
  position: fixed;
  bottom: var(--space-md);
  right: var(--space-md);
  z-index: 900;
  opacity: 0;
  transform: translateY(20px);
  transition: var(--transition-normal);
  pointer-events: none;
}

.line-fixed--visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.line-fixed__btn {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 1rem 1.5rem;
  background-color: var(--color-line-green);
  color: #ffffff;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: 50px;
  box-shadow: 0 4px 20px rgba(6, 199, 85, 0.3);
  transition: var(--transition-fast);
}

.line-fixed__btn:hover {
  background-color: #05a847;
  transform: scale(1.05);
}

.line-fixed__btn svg {
  width: 24px;
  height: 24px;
}

/* ==========================================
   Scroll Animations
   ========================================== */
.fade-in {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

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

.fade-in-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

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

.fade-in-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

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

.stagger > * {
  opacity: 0;
  transform: translateY(30px);
}

.stagger--visible > * {
  opacity: 1;
  transform: translateY(0);
}

.stagger--visible > *:nth-child(1) { transition-delay: 0.1s; }
.stagger--visible > *:nth-child(2) { transition-delay: 0.2s; }
.stagger--visible > *:nth-child(3) { transition-delay: 0.3s; }
.stagger--visible > *:nth-child(4) { transition-delay: 0.4s; }
.stagger--visible > *:nth-child(5) { transition-delay: 0.5s; }
.stagger--visible > *:nth-child(6) { transition-delay: 0.6s; }

/* ==========================================
   Utilities
   ========================================== */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

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

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

.text-right {
  text-align: right;
}

.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }

.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

/* ==========================================
   Page Transitions
   ========================================== */
.page-transition {
  position: fixed;
  inset: 0;
  background-color: var(--color-bg-primary);
  z-index: 9999;
  pointer-events: none;
  transform: scaleY(0);
  transform-origin: bottom;
}

.page-transition--enter {
  animation: pageEnter 0.6s ease forwards;
}

.page-transition--exit {
  animation: pageExit 0.6s ease forwards;
}

@keyframes pageEnter {
  0% {
    transform: scaleY(1);
    transform-origin: top;
  }
  100% {
    transform: scaleY(0);
    transform-origin: top;
  }
}

@keyframes pageExit {
  0% {
    transform: scaleY(0);
    transform-origin: bottom;
  }
  100% {
    transform: scaleY(1);
    transform-origin: bottom;
  }
}

/* ==========================================
   Why Section
   ========================================== */
.why-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.why-content__text {
  text-align: center;
}

.why-content__text p {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

.why-content__text p:last-child {
  margin-bottom: 0;
}

.why-solution {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  padding: var(--space-lg);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.why-solution::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
}

/* ==========================================
   Journey Section
   ========================================== */
.journey {
  position: relative;
}

.journey__steps {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.journey__step {
  display: flex;
  gap: var(--space-md);
  position: relative;
}

.journey__step-marker {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex-shrink: 0;
}

.journey__step-number {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background-color: var(--color-bg-primary);
  border: 1px solid var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-english);
  font-size: 1rem;
  color: var(--color-accent);
  position: relative;
  z-index: 1;
  transition: all var(--transition-normal);
}

.journey__step:hover .journey__step-number {
  background-color: var(--color-accent);
  color: var(--color-bg-primary);
}

.journey__step-line {
  width: 1px;
  flex: 1;
  min-height: 40px;
  background: linear-gradient(to bottom, var(--color-accent), var(--color-border));
}

.journey__step-line--last {
  background: transparent;
}

.journey__step-content {
  flex: 1;
  padding-bottom: var(--space-lg);
}

.journey__step-title {
  font-size: 1.125rem;
  font-weight: 500;
  margin-bottom: var(--space-xs);
  color: var(--color-text-primary);
}

.journey__step-text {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.9;
}

/* ==========================================
   Responsive Utilities
   ========================================== */
@media (max-width: 767px) {
  .hide-mobile {
    display: none !important;
  }
}

@media (min-width: 768px) {
  .hide-desktop {
    display: none !important;
  }
}

/* ==========================================
   Font Utilities
   ========================================== */
.font-serif {
  font-family: var(--font-accent);
  font-style: italic;
}

/* ==========================================
   Mobile Layout Improvements
   ========================================== */
@media (max-width: 767px) {
  /* Section spacing */
  .section {
    padding: var(--space-xl) 0;
  }
  
  /* Container padding */
  .container {
    padding-left: var(--space-sm);
    padding-right: var(--space-sm);
  }
  
  /* Hero section */
  .hero {
    padding: calc(var(--space-xxl) + 40px) 0 var(--space-lg);
    min-height: auto;
  }
  
  .hero__content {
    padding: 0 var(--space-sm);
  }
  
  .hero__title {
    font-size: 1.75rem;
    letter-spacing: 0.08em;
  }
  
  .hero__description {
    font-size: 0.9375rem;
    line-height: 1.9;
  }
  
  .hero__cta {
    flex-direction: column;
    gap: var(--space-sm);
    width: 100%;
  }
  
  .hero__cta .btn {
    width: 100%;
    justify-content: center;
  }
  
  .hero__stats {
    flex-direction: column;
    gap: var(--space-sm);
    width: 100%;
  }
  
  .hero__stat {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    padding: var(--space-md);
    width: 100%;
  }
  
  /* Section headers */
  .section-header {
    margin-bottom: var(--space-lg);
  }
  
  .section-header__title {
    font-size: 1.5rem;
  }
  
  /* Grid layouts - force vertical stacking */
  .problems,
  .philosophy-grid,
  .roadmap__steps {
    display: flex !important;
    flex-direction: column !important;
    gap: var(--space-md) !important;
  }
  
  /* Roadmap mobile */
  .roadmap__step {
    flex-direction: column !important;
    gap: var(--space-sm) !important;
  }
  
  .roadmap__number {
    position: relative !important;
    left: auto !important;
    transform: none !important;
    margin: 0 !important;
  }
  
  .roadmap__content {
    max-width: 100% !important;
    text-align: left !important;
  }
  
  .roadmap__line {
    display: none !important;
  }
  
  /* Testimonials */
  .testimonial-card {
    flex: 0 0 100% !important;
    margin-bottom: var(--space-md);
  }
  
  .testimonials-track {
    flex-direction: column;
  }
  
  /* Journey section */
  .journey__step {
    gap: var(--space-sm);
  }
  
  .journey__step-number {
    width: 40px;
    height: 40px;
    font-size: 0.875rem;
  }
  
  .journey__step-content {
    padding-bottom: var(--space-md);
  }
  
  /* CTA section */
  .cta-section__buttons {
    flex-direction: column !important;
    width: 100%;
    gap: var(--space-sm);
  }
  
  .cta-section__buttons .btn {
    width: 100%;
    justify-content: center;
  }
  
  /* Footer */
  .footer__top {
    display: flex !important;
    flex-direction: column !important;
    gap: var(--space-lg) !important;
  }
  
  .footer__nav {
    width: 100%;
  }
  
  .footer__bottom {
    flex-direction: column !important;
    text-align: center;
    gap: var(--space-md);
  }
  
  .footer__legal {
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-sm) var(--space-md);
  }
  
  /* Button adjustments */
  .btn {
    padding: 0.875rem 1.5rem;
    font-size: 0.875rem;
  }
  
  .btn--lg {
    padding: 1rem 2rem;
    font-size: 0.9375rem;
  }
  
  /* Hide decorative elements */
  .hero__deco-text,
  .hero__deco-line {
    display: none !important;
  }
  
  .hero__scroll {
    display: none;
  }
  
  /* FAQ items */
  .faq-item__question {
    padding: var(--space-md) 0;
    font-size: 0.9375rem;
  }
  
  /* Problem cards */
  .problem-card {
    padding: var(--space-md);
  }
  
  .problem-card__number {
    font-size: 2.5rem;
  }
  
  /* Philosophy items */
  .philosophy-item {
    padding: var(--space-md);
  }
}

/* Extra small mobile */
@media (max-width: 374px) {
  :root {
    font-size: 14px;
  }
  
  .hero__title {
    font-size: 1.5rem;
  }
  
  .header__logo {
    font-size: 1rem;
  }
}