/* ===== AMANE Contact Us - Stylesheet ===== */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@300;400;500;700&family=Inter:wght@300;400;500;600;700&display=swap');

/* CSS Custom Properties */
:root {
  /* Colors - AMANE Brand */
  --color-bg-primary: #0a0a1a;
  --color-bg-secondary: #12122a;
  --color-bg-card: rgba(255, 255, 255, 0.04);
  --color-bg-card-hover: rgba(255, 255, 255, 0.07);
  --color-border: rgba(255, 255, 255, 0.1);
  --color-border-focus: rgba(139, 92, 246, 0.6);

  --color-text-primary: #e8e8f0;
  --color-text-secondary: #9ca3af;
  --color-text-muted: #6b7280;
  --color-text-heading: #f5f5ff;

  --color-accent-purple: #8b5cf6;
  --color-accent-pink: #ec4899;
  --color-accent-blue: #6366f1;
  --color-accent-green: #10b981;
  --color-accent-red: #ef4444;

  --gradient-brand: linear-gradient(135deg, #8b5cf6 0%, #ec4899 50%, #6366f1 100%);
  --gradient-brand-hover: linear-gradient(135deg, #a78bfa 0%, #f472b6 50%, #818cf8 100%);
  --gradient-bg: linear-gradient(180deg, #0a0a1a 0%, #12122a 40%, #1a1040 100%);
  --gradient-glow: radial-gradient(ellipse 600px 400px at 50% 0%, rgba(139, 92, 246, 0.15) 0%, transparent 70%);

  /* Typography */
  --font-sans: 'Noto Sans JP', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* Shadows */
  --shadow-glow: 0 0 30px rgba(139, 92, 246, 0.2);
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg-primary);
  background-image: var(--gradient-bg), var(--gradient-glow);
  background-attachment: fixed;
  color: var(--color-text-primary);
  line-height: 1.7;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Page Wrapper */
.page-wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 26, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: var(--space-4) var(--space-6);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
}

.logo-text {
  font-size: var(--font-size-xl);
  font-weight: 700;
  letter-spacing: 0.1em;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo-divider {
  width: 1px;
  height: 16px;
  background: var(--color-border);
}

.logo-subtitle {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  font-weight: 500;
  letter-spacing: 0.05em;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: var(--space-6);
}

.nav-links a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: var(--font-size-sm);
  font-weight: 500;
  transition: color 0.2s ease;
}

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

.nav-links a.active {
  position: relative;
}

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-brand);
  border-radius: 2px;
}

/* Main Content */
.main-content {
  flex: 1;
  max-width: 760px;
  width: 100%;
  margin: 0 auto;
  padding: var(--space-12) var(--space-6) var(--space-16);
}

/* Hero Section */
.hero {
  text-align: center;
  margin-bottom: var(--space-10);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-4);
  background: rgba(139, 92, 246, 0.12);
  border: 1px solid var(--color-border);
  border-radius: 100px;
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--color-accent-purple);
  letter-spacing: 0.1em;
  margin-bottom: var(--space-4);
}

.hero-badge-dot {
  width: 6px;
  height: 6px;
  background: var(--color-accent-pink);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--color-accent-pink);
}

.hero h1 {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  color: var(--color-text-heading);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-3);
}

.hero-description {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  max-width: 560px;
  margin: 0 auto;
}

/* Form Container Card */
.form-card {
  background: var(--color-bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-10);
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}

.form-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-brand);
}

/* Form Groups */
.form-group {
  margin-bottom: var(--space-6);
}

.form-group label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text-heading);
  margin-bottom: var(--space-2);
}

.required-tag {
  display: inline-block;
  margin-left: var(--space-2);
  font-size: var(--font-size-xs);
  color: var(--color-accent-pink);
  font-weight: 500;
}

.form-control {
  width: 100%;
  padding: var(--space-4) var(--space-5);
  background: rgba(10, 10, 26, 0.6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-family: inherit;
  font-size: var(--font-size-base);
  transition: all 0.25s ease;
  outline: none;
}

.form-control:focus {
  border-color: var(--color-accent-purple);
  box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.25);
  background: rgba(10, 10, 26, 0.85);
}

.form-control::placeholder {
  color: var(--color-text-muted);
}

select.form-control {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%239ca3af' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-4) center;
  padding-right: var(--space-10);
  cursor: pointer;
}

select.form-control option {
  background-color: var(--color-bg-secondary);
  color: var(--color-text-primary);
}

textarea.form-control {
  resize: vertical;
  min-height: 140px;
}

.form-help {
  margin-top: var(--space-2);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

/* Submit Button */
.btn-submit {
  width: 100%;
  padding: var(--space-4) var(--space-6);
  background: var(--gradient-brand);
  border: none;
  border-radius: var(--radius-md);
  color: #ffffff;
  font-family: inherit;
  font-size: var(--font-size-base);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-glow);
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-3);
  position: relative;
}

.btn-submit:hover:not(:disabled) {
  background: var(--gradient-brand-hover);
  transform: translateY(-2px);
  box-shadow: 0 0 35px rgba(139, 92, 246, 0.4);
}

.btn-submit:active:not(:disabled) {
  transform: translateY(0);
}

.btn-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* Loading Spinner */
.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: #ffffff;
  animation: spin 0.8s linear infinite;
  display: none;
}

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

.btn-submit.loading .spinner {
  display: block;
}

.btn-submit.loading .btn-text {
  opacity: 0.8;
}

/* Notifications & Status */
.error-banner {
  padding: var(--space-4) var(--space-5);
  background: rgba(239, 68, 68, 0.12);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: var(--radius-md);
  color: #fca5a5;
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-6);
  display: none;
  align-items: center;
  gap: var(--space-3);
}

/* Success Card */
.success-card {
  text-align: center;
  padding: var(--space-8) var(--space-4);
  display: none;
  animation: fadeIn 0.5s ease-out;
}

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

.success-icon-wrap {
  width: 72px;
  height: 72px;
  background: rgba(16, 185, 129, 0.12);
  border: 2px solid var(--color-accent-green);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-6);
  box-shadow: 0 0 30px rgba(16, 185, 129, 0.25);
}

.success-icon {
  width: 36px;
  height: 36px;
  stroke: var(--color-accent-green);
  stroke-width: 3;
  fill: none;
}

.success-card h2 {
  font-size: var(--font-size-2xl);
  color: var(--color-text-heading);
  margin-bottom: var(--space-3);
}

.success-card p {
  color: var(--color-text-secondary);
  font-size: var(--font-size-base);
  margin-bottom: var(--space-8);
  line-height: 1.8;
}

.btn-secondary {
  display: inline-block;
  padding: var(--space-3) var(--space-6);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-size: var(--font-size-sm);
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-8) var(--space-6);
  background: rgba(10, 10, 26, 0.95);
  margin-top: auto;
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.copyright {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.footer-links {
  display: flex;
  gap: var(--space-6);
  list-style: none;
}

.footer-links a {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: var(--color-text-heading);
}

/* Responsive adjustments */
@media (max-width: 640px) {
  .hero h1 {
    font-size: var(--font-size-3xl);
  }

  .form-card {
    padding: var(--space-6);
  }

  .header-inner,
  .footer-inner {
    flex-direction: column;
    text-align: center;
    gap: var(--space-4);
  }
}