/* ========================================
   UriNavi - CSS Variables & Base Styles
   ======================================== */

:root {
  /* UriNavi Top Section Colors (Target Style) */
  --urinavi-bg: #f39c35;
  --urinavi-header-bg: #ffffff;
  --urinavi-green: #2a3dd9;
  --urinavi-green-dark: #00a844;
  --urinavi-text: #111111;
  --urinavi-muted: #4a4a4a;
  --urinavi-light-green: #eff1ff;

  /* Colors */
  --color-primary: #3C53F4;
  --color-primary-dark: #2a3dd9;
  --color-accent: #ED5829;
  --color-accent-dark: #d14d22;
  --color-success: #10CFA6;
  --color-white: #FFFFFF;
  --color-black: #000000;
  --color-gray-100: #f8f8f8;
  --color-gray-200: #E8E6E6;
  --color-gray-300: #c0c0c0;
  --color-gray-400: #6D6D6D;
  --color-gray-500: #4a4a4a;

  /* A/B Test Colors */
  --color-ab-red: #C00003;
  --color-ab-orange: #FB881B;
  --color-ab-green: #7AA33D;

  /* Typography */
  --font-family-base: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
  --font-family-jp: "Noto Sans JP", "Yu Gothic", "Hiragino Kaku Gothic ProN", "Meiryo", sans-serif;
  --font-size-xs: clamp(12px, 1.5vw, 14px);
  --font-size-sm: clamp(14px, 1.8vw, 16px);
  --font-size-base: clamp(16px, 2vw, 18px);
  --font-size-md: clamp(18px, 2.2vw, 22px);
  --font-size-lg: clamp(24px, 3vw, 32px);
  --font-size-xl: clamp(32px, 4vw, 48px);
  --font-size-2xl: clamp(40px, 5vw, 64px);

  /* UriNavi Top Section Font Sizes */
  --urinavi-nav-font: 15px;
  --urinavi-hero-title: clamp(48px, 6vw, 72px);
  --urinavi-hero-subtitle: clamp(18px, 2vw, 22px);
  --urinavi-hero-description: clamp(22px, 2.5vw, 28px);
  --urinavi-btn-font: 16px;

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;
  --spacing-4xl: 96px;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);

  /* Breakpoints */
  --breakpoint-mobile: 767px;
  --breakpoint-tablet: 1199px;
  --breakpoint-desktop: 1200px;

  /* Container */
  --container-max-width: 1200px;
  --container-padding: 20px;

  /* Header */
  --header-height: 70px;
  --header-height-mobile: 60px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* ========================================
   Reset & Base Styles
   ======================================== */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-black);
  background-color: var(--color-white);
  min-height: 100vh;
  overflow-x: hidden;
}

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

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

ul, ol {
  list-style: none;
}

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

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

/* ========================================
   Utility Classes
   ======================================== */

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

.section {
  padding: var(--spacing-3xl) 0;
}

.section--gray {
  background-color: var(--color-gray-100);
}

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

.section--accent {
  background-color: var(--color-accent);
  color: var(--color-white);
}

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

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

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

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

/* ========================================
   Typography
   ======================================== */

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
}

h1 {
  font-size: var(--font-size-2xl);
}

h2 {
  font-size: var(--font-size-xl);
}

h3 {
  font-size: var(--font-size-lg);
}

h4 {
  font-size: var(--font-size-md);
}

p {
  margin-bottom: var(--spacing-md);
}

p:last-child {
  margin-bottom: 0;
}

/* ========================================
   Buttons
   ======================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md) var(--spacing-xl);
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
  white-space: nowrap;
}

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

.btn--primary:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

.btn--accent:hover {
  background-color: var(--color-accent-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn--outline {
  background-color: transparent;
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
}

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

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

.btn--white:hover {
  background-color: var(--color-gray-100);
}

.btn--large {
  padding: var(--spacing-lg) var(--spacing-2xl);
  font-size: var(--font-size-md);
}

.btn--small {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
}

/* ========================================
   Cards
   ======================================== */

.card {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.card__image {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
}

.card__content {
  padding: var(--spacing-lg);
}

.card__title {
  font-size: var(--font-size-md);
  margin-bottom: var(--spacing-sm);
}

.card__text {
  font-size: var(--font-size-sm);
  color: var(--color-gray-400);
}

/* ========================================
   Grid System
   ======================================== */

.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.grid--2 {
  grid-template-columns: repeat(1, 1fr);
}

.grid--3 {
  grid-template-columns: repeat(1, 1fr);
}

.grid--4 {
  grid-template-columns: repeat(1, 1fr);
}

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

  .grid--3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid--3 {
    grid-template-columns: repeat(3, 1fr);
  }

  .grid--4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ========================================
   Flex Utilities
   ======================================== */

.flex {
  display: flex;
}

.flex--center {
  align-items: center;
  justify-content: center;
}

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

.flex--column {
  flex-direction: column;
}

.flex--wrap {
  flex-wrap: wrap;
}

.gap-sm {
  gap: var(--spacing-sm);
}

.gap-md {
  gap: var(--spacing-md);
}

.gap-lg {
  gap: var(--spacing-lg);
}

.gap-xl {
  gap: var(--spacing-xl);
}

/* ========================================
   Responsive Visibility
   ======================================== */

.mobile-only {
  display: block;
}

.desktop-only {
  display: none;
}

@media (min-width: 768px) {
  .mobile-only {
    display: none;
  }

  .desktop-only {
    display: block;
  }
}

/* ========================================
   Animations
   ======================================== */

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.animate-fade-in {
  animation: fadeIn 0.6s ease forwards;
}

.animate-slide-down {
  animation: slideDown 0.3s ease forwards;
}

/* ========================================
   Form Elements
   ======================================== */

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.form-label--required::after {
  content: '*';
  color: var(--color-accent);
  margin-left: 4px;
}

.form-input {
  width: 100%;
  padding: var(--spacing-md);
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-md);
  background-color: var(--color-white);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(60, 83, 244, 0.1);
}

.form-input::placeholder {
  color: var(--color-gray-300);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236D6D6D' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 40px;
}

.form-checkbox-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.form-checkbox {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  cursor: pointer;
}

.form-checkbox input[type="checkbox"],
.form-checkbox input[type="radio"] {
  width: 20px;
  height: 20px;
  accent-color: var(--color-primary);
  cursor: pointer;
}

.form-error {
  color: var(--color-accent);
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-xs);
}

/* ========================================
   Mobile Adjustments
   ======================================== */

@media (max-width: 767px) {
  :root {
    --container-padding: 16px;
    --spacing-3xl: 48px;
    --spacing-4xl: 64px;
  }

  .section {
    padding: var(--spacing-2xl) 0;
  }

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

  .btn--large {
    padding: var(--spacing-md) var(--spacing-xl);
  }

  /* 移动端图片安全样式 - 确保图片不溢出 */
  img,
  picture,
  video {
    max-width: 100%;
    height: auto;
  }

  /* 内容图片确保正常显示 */
  .hero__image img,
  .pageanalysis-hero__image,
  .pageanalysis-problems__image,
  .pageanalysis-optimization__image,
  .pageanalysis-features__image,
  .auto-opt-image,
  .check-features__icon img,
  .check-report__image img,
  .tag-benefits__icon img,
  .steps__image img,
  .company__map img,
  .reviews__avatar img {
    max-width: 100%;
    height: auto;
    object-fit: contain;
    display: block;
  }
}