/* style.css - Premium, Minimalist, and Elegant Design System */

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

:root {
  --font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  
  /*（Monochrome & Soft Neutrals） */
  --bg-color: #FAF9F6;           /* */
  --card-bg: #FFFFFF;
  --card-bg-alt: #F3F4F6;
  --text-primary: #111827;       /* */
  --text-secondary: #4B5563;     /* */
  --text-muted: #8E939E;         /* */
  
  --accent-color: #0F172A;       /*） */
  --accent-hover: #1E293B;
  --accent-light: rgba(15, 23, 42, 0.05);
  
  --border-color: rgba(0, 0, 0, 0.06); /* */
  --border-radius-sm: 8px;
  --border-radius-md: 16px;
  --border-radius-lg: 24px;
  
  /* */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.02);
  --shadow-md: 0 12px 30px -10px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 20px 40px -15px rgba(0, 0, 0, 0.06);
  
  --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

/* */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

html {
  scroll-behavior: smooth;
  background-color: var(--bg-color);
}

body {
  font-family: var(--font-family);
  color: var(--text-primary);
  background-color: var(--bg-color);
  line-height: 1.6;
  overflow-x: hidden;
  padding-top: 80px; /* */
}

/* modern-web-guidance） */
h1, h2, h3, h4 {
  font-weight: 700;
  letter-spacing: -0.02em;
  text-wrap: balance;
  line-height: 1.2;
}

p, li {
  text-wrap: pretty;
  color: var(--text-secondary);
}

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

/* */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 80px;
  background: rgba(250, 249, 246, 0.8); /* */
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  display: flex;
  align-items: center;
}

.nav-container {
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.03em;
}

.logo-icon {
  width: 28px;
  height: 28px;
  color: var(--accent-color);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2.5rem;
  font-size: 0.95rem;
  font-weight: 500;
}

.nav-links a:not(.nav-btn) {
  color: var(--text-secondary);
}

.nav-links a:not(.nav-btn):hover {
  color: var(--text-primary);
}

.nav-btn {
  background: var(--accent-color);
  color: #FFFFFF !important;
  padding: 0.6rem 1.25rem;
  border-radius: 40px;
  font-size: 0.9rem;
  font-weight: 600;
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.1);
}

.nav-btn:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(15, 23, 42, 0.15);
}

/* Hero */
.hero-section {
  padding: 5rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.hero-container {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 4rem;
  align-items: center;
}

.hero-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.badge {
  display: inline-flex;
  align-items: center;
  background: var(--accent-light);
  color: var(--accent-color);
  padding: 0.35rem 0.85rem;
  border-radius: 40px;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.15;
  margin-bottom: 1.5rem;
  letter-spacing: -0.03em;
}

.hero-subtitle {
  font-size: 1.125rem;
  line-height: 1.6;
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 2rem;
  border-radius: 40px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.btn-primary {
  background: var(--accent-color);
  color: #FFFFFF;
  box-shadow: 0 4px 14px rgba(15, 23, 42, 0.15);
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.2);
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid rgba(0, 0, 0, 0.1);
}

.btn-secondary:hover {
  background: rgba(0, 0, 0, 0.02);
  border-color: rgba(0, 0, 0, 0.2);
  transform: translateY(-2px);
}

/* Hero Media - */
.hero-media {
  display: flex;
  justify-content: center;
  position: relative;
}

.image-wrapper {
  transition: var(--transition-smooth);
  animation: floatEffect 6s ease-in-out infinite alternate;
}

.image-wrapper:hover {
  transform: scale(1.02) translateY(-5px);
}

.dashboard-preview {
  display: block;
  width: 100%;
  max-width: 440px;
  height: auto;
  border-radius: calc(var(--border-radius-lg) - 8px);
}

@keyframes floatEffect {
  0% { transform: translateY(0px); }
  100% { transform: translateY(-12px); }
}

/* Section */
.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 4rem auto;
}

.section-title {
  font-size: 2.25rem;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
}

/* Section (Features) */
.features-section {
  padding: 7rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.5rem;
}

.feature-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  padding: 2.5rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-smooth);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(15, 23, 42, 0.1);
}

.feature-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-light);
  color: var(--accent-color);
  border-radius: 12px;
  margin-bottom: 1.5rem;
}

.feature-icon svg {
  width: 24px;
  height: 24px;
}

.feature-card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.feature-card p {
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Section (Calculator) */
.calculator-section {
  padding: 7rem 2rem;
  background: #F3F4F6; /* */
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.calculator-container {
  max-width: 1000px;
  margin: 0 auto;
  background: var(--card-bg);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  overflow: hidden;
}

.calc-panel.static-mode {
  padding: 3.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 2rem;
  background: var(--card-bg-alt);
}

.calc-badge-row {
  margin-bottom: 0.5rem;
}

.calc-illustration-badge {
  display: inline-block;
  background: rgba(0, 0, 0, 0.05);
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.3rem 0.75rem;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.calc-card {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  padding: 1.75rem;
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-smooth);
}

.calc-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: rgba(15, 23, 42, 0.1);
}

.calc-card-icon {
  width: 52px;
  height: 52px;
  background: var(--accent-light);
  color: var(--accent-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.calc-card-icon svg {
  width: 24px;
  height: 24px;
}

.calc-card-text {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.calc-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.calc-value {
  font-size: 1.85rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
}

.calc-value .currency {
  font-size: 1rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-right: 0.25rem;
}

.calc-value .days-text {
  font-size: 1.1rem;
  color: var(--text-secondary);
  font-weight: 600;
}

/* */
.calc-results {
  background: #FAF9F6;
  padding: 3.5rem;
  border-left: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
}

.calc-results h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 2rem;
  color: var(--text-primary);
}

.results-table {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  flex-grow: 1;
}

.result-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.95rem;
}

.result-row span:first-child {
  color: var(--text-secondary);
}

.rate-badge {
  background: rgba(0, 0, 0, 0.04);
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
}

.amount-accent {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
}

.calc-divider {
  border: 0;
  height: 1px;
  background: var(--border-color);
  margin: 0.5rem 0;
}

.total-row {
  margin-top: 0.5rem;
}

.total-row span:first-child {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary) !important;
}

.amount-accent-total {
  font-size: 1.85rem;
  font-weight: 700;
  color: var(--accent-color);
}

.calc-notice {
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-top: 2rem;
}

/* Section (Details) */
.details-section {
  padding: 7rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.details-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: center;
}

.details-text h2 {
  font-size: 2.25rem;
  margin-bottom: 1.5rem;
}

.details-lead {
  font-size: 1.1rem;
  margin-bottom: 3rem;
}

.terms-list {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.term-item {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
}

.term-bullet {
  flex-shrink: 0;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-color);
  margin-top: 0.6rem;
}

.term-item strong {
  display: block;
  font-size: 1.05rem;
  margin-bottom: 0.35rem;
  color: var(--text-primary);
}

.term-item p {
  font-size: 0.95rem;
}

/* */
.qualification-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  transition: var(--transition-smooth);
}

.qualification-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 30px 60px -20px rgba(0,0,0,0.08);
}

.illustration-wrapper {
  background: #F9FAFB;
  padding: 2.5rem;
  display: flex;
  justify-content: center;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
}

.security-img {
  width: 100%;
  max-width: 260px;
  height: auto;
  mix-blend-mode: multiply; /* */
}

.qualification-body {
  padding: 3rem;
}

.qualification-body h3 {
  font-size: 1.35rem;
  margin-bottom: 1.5rem;
}

.qualification-body ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.qualification-body li {
  font-size: 0.95rem;
  position: relative;
  padding-left: 1.5rem;
}

.qualification-body li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--accent-color);
  font-weight: 700;
}

.terms-disclaimer {
  font-size: 0.8rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-color);
  padding-top: 1.25rem;
  margin-top: 1.25rem;
}

/* (Footer) */
.footer {
  background: var(--text-primary);
  color: #FFFFFF;
  padding: 5rem 2rem 2.5rem 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto 4rem auto;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 4rem;
}

.footer-branding {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1rem;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.footer-logo .logo-icon {
  color: #FFFFFF;
}

.footer-branding p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.footer-links {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1rem;
}

.footer-links h4 {
  font-size: 1.1rem;
  color: #FFFFFF;
  margin-bottom: 0.25rem;
}

.footer-links p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.email-link {
  color: #FFFFFF !important;
  font-size: 1.25rem;
  font-weight: 600;
  border-bottom: 2px solid rgba(255, 255, 255, 0.2);
  padding-bottom: 0.2rem;
}

.email-link:hover {
  border-color: #FFFFFF;
  padding-bottom: 0.3rem;
}

.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 2rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* */
@media (max-width: 968px) {
  .hero-container {
    grid-template-columns: 1fr;
    gap: 3rem;
    text-align: center;
  }
  
  .hero-text {
    align-items: center;
  }
  
  .hero-title {
    font-size: 2.75rem;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .calculator-container {
    grid-template-columns: 1fr;
  }
  
  .calc-results {
    border-left: none;
    border-top: 1px solid var(--border-color);
  }
  
  .details-grid {
    grid-template-columns: 1fr;
    gap: 4rem;
  }
  
  .footer-container {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
}

@media (max-width: 640px) {
  body {
    padding-top: 70px;
  }
  
  .navbar {
    height: 70px;
  }
  
  .nav-links {
    display: none; /* */
  }
  
  .hero-title {
    font-size: 2.25rem;
  }
  
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  
  .btn {
    width: 100%;
  }
  
  .calc-panel, .calc-results {
    padding: 2rem;
  }
  
  .qualification-body {
    padding: 2rem;
  }
}