/* ============================================================
   0083 Swiss Typography / 瑞士国际主义 Style System
   Strict 3-color palette: White #ffffff + Red #e11d48 + Black #000000
   ============================================================ */

/* === GOOGLE FONTS IMPORT === */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* === CSS CUSTOM PROPERTIES === */
:root {
  --swiss-white: #ffffff;
  --swiss-red: #e11d48;
  --swiss-black: #000000;
  --swiss-font: 'Inter', 'Helvetica Neue', 'Arial', sans-serif;
  --swiss-grid-gap: 1.5rem;
  --swiss-border-thick: 4px solid var(--swiss-black);
  --swiss-border-thin: 1px solid var(--swiss-black);
  --swiss-red-line: 3px solid var(--swiss-red);
}

/* === BASE RESET === */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--swiss-font);
  background-color: var(--swiss-white);
  color: var(--swiss-black);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* === TYPOGRAPHIC SCALE === */
.swiss-h1 {
  font-family: var(--swiss-font);
  font-size: clamp(2.5rem, 6vw, 4.5rem); /* up to 72px */
  font-weight: 900;
  line-height: 0.95;
  letter-spacing: -0.03em;
  text-transform: none;
}

.swiss-h2 {
  font-family: var(--swiss-font);
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.swiss-h3 {
  font-family: var(--swiss-font);
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  font-weight: 700;
  line-height: 1.2;
}

.swiss-label {
  font-family: var(--swiss-font);
  font-size: 0.6875rem; /* 11px */
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--swiss-red);
}

.swiss-body {
  font-family: var(--swiss-font);
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.7;
}

.swiss-body-sm {
  font-family: var(--swiss-font);
  font-size: 0.8125rem;
  font-weight: 400;
  line-height: 1.6;
}

.swiss-number {
  font-family: var(--swiss-font);
  font-size: clamp(2rem, 4vw, 3.5rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--swiss-black);
  line-height: 1;
}

/* === GRID SYSTEM === */
.swiss-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--swiss-grid-gap);
}

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

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

.swiss-grid-2-1 {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--swiss-grid-gap);
}

.swiss-grid-1-2 {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--swiss-grid-gap);
}

.swiss-grid-1-3 {
  display: grid;
  grid-template-columns: 1fr 3fr;
  gap: var(--swiss-grid-gap);
}

.swiss-grid-footer {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--swiss-grid-gap);
}

/* === HORIZONTAL RULES === */
.swiss-hr-thick {
  border: none;
  border-top: var(--swiss-border-thick);
  margin: 2rem 0;
}

.swiss-hr-thin {
  border: none;
  border-top: var(--swiss-border-thin);
  margin: 1.5rem 0;
}

.swiss-hr-red {
  border: none;
  border-top: 2px solid var(--swiss-red);
  width: 4rem;
  margin: 1rem 0;
}

/* === RED ACCENT LINE (left border) === */
.swiss-red-accent {
  border-left: var(--swiss-red-line);
  padding-left: 1rem;
}

.swiss-red-accent-top {
  border-top: var(--swiss-red-line);
  padding-top: 0.5rem;
}

/* === BLACK BARS === */
.swiss-black-bar {
  background-color: var(--swiss-black);
  color: var(--swiss-white);
  padding: 0.75rem 1.5rem;
  display: inline-block;
  font-weight: 700;
  font-size: 0.875rem;
  letter-spacing: 0.05em;
}

.swiss-black-bar-full {
  background-color: var(--swiss-black);
  color: var(--swiss-white);
  padding: 1rem 2rem;
  width: 100%;
}

/* === BUTTONS === */
.swiss-btn {
  display: inline-block;
  font-family: var(--swiss-font);
  font-weight: 700;
  font-size: 0.9375rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.85rem 2.25rem;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
  text-align: center;
}

.swiss-btn-red {
  background-color: var(--swiss-red);
  color: var(--swiss-white);
  border: 2px solid var(--swiss-red);
}

.swiss-btn-red:hover {
  background-color: var(--swiss-white);
  color: var(--swiss-red);
}

.swiss-btn-black {
  background-color: var(--swiss-black);
  color: var(--swiss-white);
  border: 2px solid var(--swiss-black);
}

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

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

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

/* === HEADER / NAVIGATION === */
.swiss-header {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  padding: 1.25rem 3rem;
  border-bottom: var(--swiss-border-thick);
  position: sticky;
  top: 0;
  background: var(--swiss-white);
  z-index: 100;
}

.swiss-logo {
  font-family: var(--swiss-font);
  font-size: 1.25rem;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--swiss-black);
  text-decoration: none;
}

.swiss-logo span {
  color: var(--swiss-red);
}

.swiss-nav {
  display: flex;
  justify-content: flex-end;
  gap: 2rem;
  list-style: none;
}

.swiss-nav a {
  font-family: var(--swiss-font);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--swiss-black);
  text-decoration: none;
  padding-bottom: 0.25rem;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s ease;
}

.swiss-nav a:hover,
.swiss-nav a.active {
  border-bottom-color: var(--swiss-red);
}

.swiss-nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 0.5rem;
  background: none;
  border: none;
}

.swiss-nav-toggle span {
  display: block;
  width: 24px;
  height: 3px;
  background: var(--swiss-black);
  transition: all 0.3s ease;
}

/* === SECTIONS === */
.swiss-section {
  padding: 5rem 3rem;
}

.swiss-section-tight {
  padding: 3rem;
}

.swiss-section-label {
  font-family: var(--swiss-font);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--swiss-red);
  margin-bottom: 0.5rem;
}

/* === HERO ASYMMETRIC === */
.swiss-hero-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.6fr;
  gap: 2rem;
  align-items: center;
  min-height: 75vh;
}

.swiss-hero-title-zone {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.swiss-hero-side {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  justify-content: center;
  border-left: var(--swiss-red-line);
  padding-left: 2rem;
}

/* === FEATURE CARDS (numbered) === */
.swiss-feature-card {
  border: var(--swiss-border-thin);
  padding: 2rem;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.swiss-feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--swiss-red);
}

.swiss-feature-number {
  font-family: var(--swiss-font);
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--swiss-black);
  line-height: 1;
}

/* === STAT BLOCK === */
.swiss-stat-item {
  text-align: left;
  padding: 2rem 0;
  border-top: var(--swiss-border-thin);
}

.swiss-stat-number {
  font-family: var(--swiss-font);
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.03em;
}

.swiss-stat-label {
  font-size: 0.6875rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--swiss-black);
  opacity: 0.6;
  margin-top: 0.5rem;
}

/* === TESTIMONIALS === */
.swiss-quote {
  border-left: var(--swiss-red-line);
  padding: 1rem 0 1rem 1.5rem;
  font-size: 1.125rem;
  font-weight: 400;
  line-height: 1.7;
  font-style: italic;
  margin-bottom: 1rem;
}

.swiss-quote-author {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding-left: 1.5rem;
}

/* === FAQ ACCORDION === */
.swiss-faq-item {
  border-top: var(--swiss-border-thin);
}

.swiss-faq-item:last-child {
  border-bottom: var(--swiss-border-thin);
}

.swiss-faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  padding: 1.25rem 0;
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--swiss-font);
  font-size: 1.0625rem;
  font-weight: 600;
  text-align: left;
  color: var(--swiss-black);
}

.swiss-faq-question:hover {
  color: var(--swiss-red);
}

.swiss-faq-toggle {
  font-size: 1.5rem;
  font-weight: 300;
  line-height: 1;
  transition: transform 0.3s ease;
  flex-shrink: 0;
  margin-left: 1rem;
}

.swiss-faq-item.active .swiss-faq-toggle {
  transform: rotate(45deg);
}

.swiss-faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
}

.swiss-faq-item.active .swiss-faq-answer {
  max-height: 20rem;
  padding-bottom: 1.25rem;
}

/* === CTA BLOCK === */
.swiss-cta-block {
  background: var(--swiss-black);
  color: var(--swiss-white);
  padding: 4rem 3rem;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2rem;
  align-items: center;
}

/* === FOOTER === */
.swiss-footer {
  background: var(--swiss-black);
  color: var(--swiss-white);
  padding: 4rem 3rem 2rem;
}

.swiss-footer a {
  color: var(--swiss-white);
  text-decoration: none;
  font-size: 0.8125rem;
  opacity: 0.7;
  transition: opacity 0.2s;
}

.swiss-footer a:hover {
  opacity: 1;
  color: var(--swiss-red);
}

.swiss-footer h4 {
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--swiss-red);
  margin-bottom: 1.25rem;
}

.swiss-footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.15);
  margin-top: 3rem;
  padding-top: 1.5rem;
  font-size: 0.75rem;
  opacity: 0.5;
  display: flex;
  justify-content: space-between;
}

/* === TABS === */
.swiss-tabs {
  display: flex;
  gap: 0;
  border-bottom: var(--swiss-border-thick);
  margin-bottom: 2rem;
}

.swiss-tab-btn {
  font-family: var(--swiss-font);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 1rem 2rem;
  background: none;
  border: none;
  border-bottom: 3px solid transparent;
  cursor: pointer;
  color: var(--swiss-black);
  opacity: 0.5;
  transition: all 0.2s ease;
}

.swiss-tab-btn.active {
  opacity: 1;
  border-bottom-color: var(--swiss-red);
}

.swiss-tab-btn:hover {
  opacity: 0.8;
}

.swiss-tab-content {
  display: none;
}

.swiss-tab-content.active {
  display: block;
}

/* === PROCESS STEPS === */
.swiss-step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 2rem;
  align-items: start;
  padding: 1.5rem 0;
}

.swiss-step-number {
  font-family: var(--swiss-font);
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 900;
  line-height: 0.75;
  color: var(--swiss-red);
}

/* === TABLE / TIER GRID === */
.swiss-table {
  width: 100%;
  border-collapse: collapse;
}

.swiss-table th {
  font-size: 0.6875rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  text-align: left;
  padding: 0.75rem 1rem;
  background: var(--swiss-black);
  color: var(--swiss-white);
  font-weight: 600;
}

.swiss-table td {
  padding: 0.75rem 1rem;
  border-bottom: var(--swiss-border-thin);
  font-size: 0.9375rem;
}

.swiss-table tr:hover td {
  background: #f5f5f5;
}

/* === CONTAINER === */
.swiss-container {
  max-width: 1280px;
  margin: 0 auto;
}

.swiss-container-narrow {
  max-width: 960px;
  margin: 0 auto;
}

/* === UTILITY SPACING === */
.swiss-mb-1 { margin-bottom: 0.5rem; }
.swiss-mb-2 { margin-bottom: 1rem; }
.swiss-mb-3 { margin-bottom: 1.5rem; }
.swiss-mb-4 { margin-bottom: 2rem; }
.swiss-mb-6 { margin-bottom: 3rem; }
.swiss-gap-1 { gap: 1rem; }
.swiss-gap-2 { gap: 2rem; }
.swiss-gap-3 { gap: 3rem; }

/* === BACK TO TOP === */
.swiss-back-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 44px;
  height: 44px;
  background: var(--swiss-red);
  color: var(--swiss-white);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
  font-size: 1.25rem;
  z-index: 50;
}

.swiss-back-top.visible {
  opacity: 1;
  pointer-events: auto;
}

/* === MOBILE MENU === */
.swiss-mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--swiss-black);
  color: var(--swiss-white);
  z-index: 200;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 2rem;
}

.swiss-mobile-menu.active {
  display: flex;
}

.swiss-mobile-menu a {
  font-family: var(--swiss-font);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--swiss-white);
  text-decoration: none;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  transition: color 0.2s;
}

.swiss-mobile-menu a:hover {
  color: var(--swiss-red);
}

.swiss-mobile-close {
  position: absolute;
  top: 1.5rem;
  right: 2rem;
  font-size: 2rem;
  color: var(--swiss-white);
  background: none;
  border: none;
  cursor: pointer;
  line-height: 1;
}

/* === RESPONSIVE === */
@media (max-width: 1024px) {
  .swiss-section {
    padding: 3.5rem 2rem;
  }
  .swiss-grid-3 { grid-template-columns: repeat(2, 1fr); }
  .swiss-grid-4 { grid-template-columns: repeat(2, 1fr); }
  .swiss-grid-footer { grid-template-columns: 1fr 1fr; }
  .swiss-hero-grid { grid-template-columns: 1fr; }
  .swiss-hero-side {
    border-left: none;
    border-top: var(--swiss-red-line);
    padding-left: 0;
    padding-top: 1.5rem;
  }
}

@media (max-width: 768px) {
  .swiss-section {
    padding: 2.5rem 1.25rem;
  }
  .swiss-section-tight {
    padding: 2rem 1.25rem;
  }
  .swiss-header {
    padding: 1rem 1.25rem;
  }
  .swiss-nav {
    display: none;
  }
  .swiss-nav-toggle {
    display: flex;
  }
  .swiss-grid-2,
  .swiss-grid-2-1,
  .swiss-grid-1-2,
  .swiss-grid-1-3 { grid-template-columns: 1fr; }
  .swiss-grid-3 { grid-template-columns: 1fr; }
  .swiss-grid-4 { grid-template-columns: 1fr; }
  .swiss-grid-footer { grid-template-columns: 1fr; }
  .swiss-cta-block { grid-template-columns: 1fr; text-align: left; }
  .swiss-tabs { overflow-x: auto; }
  .swiss-tab-btn {
    padding: 0.75rem 1rem;
    font-size: 0.75rem;
    white-space: nowrap;
  }
  .swiss-hero-grid { min-height: auto; }
}

@media (max-width: 480px) {
  .swiss-section {
    padding: 2rem 1rem;
  }
  .swiss-footer {
    padding: 2.5rem 1rem 1.5rem;
  }
}