/* ===== 灵感课间 — Landing Page (Cartoon Brutalist Redesign) ===== */
/* Bold black outlines, flat solid colors, chunky drop shadows, expressive typography */

:root {
  --yellow: #fbbf24;
  --yellow-dark: #f59e0b;
  --yellow-light: #fef3c7;
  --black: #1a1a1a;
  --white: #ffffff;
  --off-white: #fafafa;
  --gray-100: #f5f5f5;
  --gray-200: #e5e5e5;
  --gray-300: #d4d4d4;
  --gray-400: #a3a3a3;
  --gray-500: #737373;
  --gray-600: #525252;
  --gray-700: #404040;
  --gray-800: #262626;
  --blue: #3b82f6;
  --blue-dark: #1d4ed8;
  --green: #22c55e;
  --red: #ef4444;
  --orange: #f97316;
  --pink: #ec4899;
  --purple: #a855f7;
  --teal: #14b8a6;

  --shadow-chunky: 6px 6px 0px var(--black);
  --shadow-chunky-hover: 8px 8px 0px var(--black);
  --shadow-chunky-sm: 4px 4px 0px var(--black);
  --shadow-chunky-blue: 6px 6px 0px var(--blue-dark);
  --border-thick: 3px solid var(--black);
  --border-medium: 2px solid var(--black);
  --radius: 16px;
  --radius-sm: 8px;
  --radius-full: 9999px;

  --transition-bounce: 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  --transition: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--off-white);
  color: var(--black);
  line-height: 1.5;
  overflow-x: hidden;
}

/* ===== Background squiggles (fun brutalist touch) ===== */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(circle at 10% 20%, rgba(251,191,36,0.12) 0%, transparent 50%),
    radial-gradient(circle at 90% 80%, rgba(59,130,246,0.08) 0%, transparent 50%),
    radial-gradient(circle at 50% 50%, rgba(34,197,94,0.05) 0%, transparent 50%);
  pointer-events: none;
  z-index: -1;
}

/* ===== Beta Banner ===== */
.beta-banner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--yellow-light);
  border-bottom: 2px solid var(--orange);
  font-size: 13px;
  font-weight: 600;
  color: var(--gray-700);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1001;
}

.beta-banner__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--orange);
  animation: pulse 2s ease-in-out infinite;
}

.beta-banner__close {
  position: absolute;
  right: 12px;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 16px;
  color: var(--gray-500);
  padding: 4px 8px;
  border-radius: 4px;
  transition: all var(--transition);
}

.beta-banner__close:hover {
  background: var(--gray-200);
  color: var(--black);
}

/* ===== Demo Button ===== */
.hero__btn--demo {
  background: var(--green);
  color: var(--white);
  box-shadow: var(--shadow-chunky);
  border-color: #16a34a;
}

.hero__btn--demo:hover {
  transform: translate(-3px, -3px);
  box-shadow: 8px 8px 0px #15803d;
  background: #16a34a;
}

/* ===== Navigation ===== */
.landing-nav {
  position: fixed;
  top: 36px;
  left: 0;
  right: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 32px;
  height: 64px;
  background: var(--white);
  border-bottom: var(--border-thick);
  transition: box-shadow var(--transition);
}

.landing-nav.scrolled {
  box-shadow: 0 4px 0 var(--black);
}

.landing-nav__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-weight: 800;
  font-size: 22px;
  color: var(--black);
  transition: transform var(--transition-bounce);
}

.landing-nav__brand:hover { transform: scale(1.03); }

.landing-nav__logo {
  width: 36px;
  height: 36px;
}

.landing-nav__links {
  display: flex;
  align-items: center;
  gap: 6px;
}

.landing-nav__link {
  text-decoration: none;
  color: var(--gray-600);
  font-size: 14px;
  font-weight: 700;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  border: 2px solid transparent;
  transition: all var(--transition-bounce);
}

.landing-nav__link:hover {
  color: var(--black);
  border-color: var(--black);
  background: var(--yellow-light);
}

.landing-nav__link--primary {
  background: var(--yellow);
  color: var(--black);
  border: var(--border-medium);
  box-shadow: var(--shadow-chunky-sm);
}

.landing-nav__link--primary:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-chunky);
  background: var(--yellow-dark);
  color: var(--white);
  border-color: var(--black);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 156px 24px 80px;
  overflow: hidden;
  min-height: 80vh;
}

/* Hero background - big yellow blob */
.hero::before {
  content: "";
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(251,191,36,0.2) 0%, rgba(251,191,36,0.05) 40%, transparent 65%);
  pointer-events: none;
  border-radius: 50%;
}

/* Decorative floating shapes */
.hero__deco {
  position: absolute;
  pointer-events: none;
  font-size: 48px;
  opacity: 0.3;
  animation: float 6s ease-in-out infinite;
}
.hero__deco--1 { top: 15%; left: 8%; animation-delay: 0s; }
.hero__deco--2 { top: 25%; right: 10%; animation-delay: 2s; font-size: 32px; }
.hero__deco--3 { bottom: 30%; left: 5%; animation-delay: 4s; font-size: 40px; }

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-20px) rotate(8deg); }
}

.hero__badge {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px 8px 16px;
  border-radius: var(--radius-full);
  background: var(--white);
  border: var(--border-medium);
  box-shadow: var(--shadow-chunky-sm);
  color: var(--gray-700);
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 32px;
  animation: popIn 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

.hero__badge-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--green);
  border: 2px solid var(--black);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.3); }
}

.hero__title {
  position: relative;
  font-size: 64px;
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
  animation: popIn 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) 0.1s both;
}

.hero__title-line {
  display: block;
}

.hero__title-line--highlight {
  display: inline-block;
  background: var(--yellow);
  padding: 0 12px;
  border: var(--border-thick);
  box-shadow: var(--shadow-chunky-sm);
  transform: rotate(-1deg);
  margin-top: 4px;
}

@keyframes popIn {
  from { opacity: 0; transform: scale(0.9) translateY(20px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.hero__subtitle {
  position: relative;
  font-size: 18px;
  color: var(--gray-600);
  max-width: 600px;
  margin-bottom: 36px;
  line-height: 1.7;
  font-weight: 500;
  animation: fadeUp 0.6s ease-out 0.2s both;
}

.hero__actions {
  position: relative;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
  animation: fadeUp 0.6s ease-out 0.3s both;
}

.hero__btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 16px 36px;
  border-radius: var(--radius-sm);
  font-size: 17px;
  font-weight: 800;
  text-decoration: none;
  transition: all var(--transition-bounce);
  cursor: pointer;
  border: var(--border-thick);
  letter-spacing: 0.01em;
  background: var(--white);
  color: var(--black);
}

.hero__btn--primary {
  background: var(--yellow);
  box-shadow: var(--shadow-chunky);
}

.hero__btn--primary:hover {
  transform: translate(-3px, -3px);
  box-shadow: 8px 8px 0px var(--black);
  background: var(--yellow-dark);
  color: var(--white);
}

.hero__btn--secondary {
  background: var(--white);
  box-shadow: var(--shadow-chunky-sm);
}

.hero__btn--secondary:hover {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-chunky);
  background: var(--gray-100);
}

/* ===== Hero Stats ===== */
.hero-stats {
  position: relative;
  display: flex;
  gap: 40px;
  justify-content: center;
  margin-top: 56px;
  animation: fadeUp 0.6s ease-out 0.4s both;
  flex-wrap: wrap;
}

.hero-stat {
  text-align: center;
  background: var(--white);
  border: var(--border-medium);
  border-radius: var(--radius);
  padding: 20px 28px;
  box-shadow: var(--shadow-chunky-sm);
  min-width: 120px;
}

.hero-stat__number {
  font-size: 36px;
  font-weight: 900;
  color: var(--black);
  line-height: 1.1;
}

.hero-stat__label {
  font-size: 13px;
  font-weight: 600;
  color: var(--gray-500);
  margin-top: 4px;
}

/* ===== Trust Bar ===== */
.trust-bar {
  padding: 40px 24px;
  text-align: center;
  border-top: var(--border-thick);
  border-bottom: var(--border-thick);
  background: var(--white);
}

.trust-bar__label {
  font-size: 14px;
  font-weight: 800;
  color: var(--gray-500);
  margin-bottom: 20px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.trust-bar__logos {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
}

.trust-bar__logo {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  background: var(--yellow-light);
  border: 2px solid var(--black);
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 700;
  color: var(--gray-700);
  white-space: nowrap;
  transition: transform var(--transition-bounce);
}

.trust-bar__logo:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-chunky-sm);
}

/* ===== Persona Cards ===== */
.persona-section {
  padding: 100px 24px;
  max-width: 1120px;
  margin: 0 auto;
}

.section-title {
  text-align: center;
  font-size: 40px;
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 12px;
}

.section-subtitle {
  text-align: center;
  font-size: 18px;
  color: var(--gray-500);
  font-weight: 500;
  max-width: 600px;
  margin: 0 auto 48px;
}

.persona-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.persona-card {
  background: var(--white);
  border: var(--border-thick);
  border-radius: var(--radius);
  padding: 40px 32px;
  text-align: center;
  transition: all var(--transition-bounce);
  cursor: pointer;
  position: relative;
  box-shadow: var(--shadow-chunky-sm);
}

.persona-card:hover {
  transform: translate(-4px, -4px);
  box-shadow: var(--shadow-chunky);
}

.persona-card:active {
  transform: translate(0px, 0px);
  box-shadow: var(--shadow-chunky-sm);
}

.persona-card__icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 40px;
  background: var(--yellow-light);
  border: var(--border-thick);
  border-radius: var(--radius);
  transition: transform var(--transition-bounce);
}

.persona-card:hover .persona-card__icon {
  transform: scale(1.1) rotate(-3deg);
}

/* Per-card accent colors */
.persona-card[data-preset="student"] .persona-card__btn { background: #dbeafe; border-color: var(--blue); color: var(--blue-dark); }
.persona-card[data-preset="teacher"] .persona-card__btn { background: #fef3c7; border-color: var(--yellow-dark); color: var(--gray-700); }
.persona-card[data-preset="researcher"] .persona-card__btn { background: #f3e8ff; border-color: var(--purple); color: #7c3aed; }

.persona-card[data-preset="student"]:hover .persona-card__btn,
.persona-card[data-preset="teacher"]:hover .persona-card__btn,
.persona-card[data-preset="researcher"]:hover .persona-card__btn {
  background: var(--black);
  color: var(--white);
  border-color: var(--black);
}

.persona-card__title {
  font-size: 24px;
  font-weight: 800;
  margin-bottom: 12px;
}

.persona-card__desc {
  font-size: 14px;
  color: var(--gray-500);
  line-height: 1.7;
  margin-bottom: 24px;
}

.persona-card__btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 700;
  border: var(--border-medium);
  cursor: pointer;
  transition: all var(--transition-bounce);
  text-decoration: none;
}

.persona-card__btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-chunky-sm);
}

/* ===== Tool Cards Section (like MagicSchool) ===== */
.tools-section {
  padding: 80px 24px;
  background: var(--yellow);
  border-top: var(--border-thick);
  border-bottom: var(--border-thick);
}

.tools-section .container {
  max-width: 1120px;
  margin: 0 auto;
}

.tools-section .section-title { color: var(--black); }
.tools-section .section-subtitle { color: var(--gray-600); }

.tools-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.tool-card {
  background: var(--white);
  border: var(--border-thick);
  border-radius: var(--radius);
  padding: 24px 20px;
  text-align: center;
  transition: all var(--transition-bounce);
  box-shadow: var(--shadow-chunky-sm);
  position: relative;
  overflow: hidden;
}

.tool-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: var(--black);
  opacity: 0;
  transition: opacity var(--transition);
}

.tool-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-chunky);
}

.tool-card:hover::after { opacity: 1; }

.tool-card__icon {
  font-size: 36px;
  margin-bottom: 12px;
  display: block;
}

.tool-card__title {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 4px;
}

.tool-card__desc {
  font-size: 12px;
  color: var(--gray-500);
  line-height: 1.5;
}

.tool-card__tag {
  display: inline-block;
  margin-top: 8px;
  padding: 3px 10px;
  font-size: 10px;
  font-weight: 800;
  border: 2px solid var(--black);
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ===== Social Proof ===== */
.testimonial-section {
  padding: 100px 24px;
  max-width: 1120px;
  margin: 0 auto;
}

.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.testimonial-card {
  background: var(--white);
  border: var(--border-thick);
  border-radius: var(--radius);
  padding: 32px 28px;
  box-shadow: var(--shadow-chunky-sm);
  position: relative;
  transition: transform var(--transition-bounce);
}

.testimonial-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-chunky);
}

.testimonial-card__quote {
  font-size: 36px;
  font-weight: 900;
  color: var(--yellow);
  line-height: 0.6;
  margin-bottom: 12px;
  font-family: Georgia, serif;
}

.testimonial-card__text {
  font-size: 14px;
  color: var(--gray-600);
  line-height: 1.7;
  margin-bottom: 16px;
}

.testimonial-card__author {
  font-size: 14px;
  font-weight: 800;
  color: var(--black);
}

.testimonial-card__role {
  font-size: 12px;
  color: var(--gray-400);
  font-weight: 600;
}

/* ===== Features Section ===== */
.features-section {
  padding: 100px 24px;
  background: var(--white);
  border-top: var(--border-thick);
  border-bottom: var(--border-thick);
}

.features-section .container { max-width: 1120px; margin: 0 auto; }

.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.feature-card {
  background: var(--off-white);
  border: var(--border-medium);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  gap: 20px;
  align-items: flex-start;
  transition: all var(--transition-bounce);
  box-shadow: var(--shadow-chunky-sm);
}

.feature-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-chunky);
  border-color: var(--black);
}

.feature-card__icon {
  width: 56px;
  height: 56px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  background: var(--yellow-light);
  border: var(--border-medium);
  border-radius: var(--radius-sm);
}

.feature-card__title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
}

.feature-card__desc {
  font-size: 13px;
  color: var(--gray-500);
  line-height: 1.7;
}

/* ===== CTA ===== */
.cta-section {
  text-align: center;
  padding: 100px 24px;
  background: var(--black);
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  right: -50%;
  bottom: -50%;
  background:
    radial-gradient(ellipse at 30% 50%, rgba(251,191,36,0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 70% 50%, rgba(59,130,246,0.1) 0%, transparent 50%);
  pointer-events: none;
}

.cta-section h2 {
  position: relative;
  font-size: 40px;
  font-weight: 900;
  color: var(--white);
  margin-bottom: 16px;
  line-height: 1.2;
}

.cta-section p {
  position: relative;
  color: var(--gray-400);
  font-size: 16px;
  margin-bottom: 36px;
  line-height: 1.7;
}

.cta-section .hero__btn--primary {
  position: relative;
  background: var(--yellow);
  color: var(--black);
  box-shadow: 6px 6px 0px rgba(251,191,36,0.4);
  border-color: var(--white);
}

.cta-section .hero__btn--primary:hover {
  background: var(--white);
  color: var(--black);
  box-shadow: 8px 8px 0px var(--yellow);
  transform: translate(-3px, -3px);
}

/* ===== Footer ===== */
.landing-footer {
  padding: 48px 24px;
  background: var(--off-white);
  text-align: center;
  border-top: var(--border-thick);
}

.landing-footer__brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-bottom: 20px;
}

.landing-footer__brand img {
  width: 32px;
  height: 32px;
}

.landing-footer__brand span {
  font-size: 18px;
  font-weight: 800;
  color: var(--black);
}

.landing-footer__links {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.landing-footer__link {
  font-size: 13px;
  font-weight: 600;
  color: var(--gray-500);
  text-decoration: none;
  padding: 4px 12px;
  border: 2px solid transparent;
  border-radius: var(--radius-sm);
  transition: all var(--transition-bounce);
}

.landing-footer__link:hover {
  color: var(--black);
  border-color: var(--black);
  background: var(--yellow-light);
}

.landing-footer__text {
  font-size: 12px;
  color: var(--gray-400);
  line-height: 1.8;
}

.landing-footer__text a {
  color: var(--gray-500);
  text-decoration: none;
  font-weight: 600;
}

.landing-footer__text a:hover { color: var(--black); }

/* ===== Auth Modal ===== */
.auth-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(26, 26, 26, 0.7);
  backdrop-filter: blur(4px);
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.auth-overlay.is-open { display: flex; }

.auth-modal {
  background: var(--white);
  border: var(--border-thick);
  border-radius: var(--radius);
  width: 440px;
  max-width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  padding: 40px 36px 32px;
  position: relative;
  box-shadow: 12px 12px 0px var(--black);
  animation: modalBounce 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes modalBounce {
  from { opacity: 0; transform: scale(0.9) translateY(30px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.auth-modal__close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: var(--border-medium);
  background: var(--white);
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--black);
  transition: all var(--transition-bounce);
}

.auth-modal__close:hover {
  background: var(--red);
  color: var(--white);
  transform: rotate(90deg);
}

.auth-modal__logo {
  width: 60px;
  height: 60px;
  margin: 0 auto 20px;
  display: block;
}

.auth-modal__title {
  text-align: center;
  font-size: 24px;
  font-weight: 800;
  margin-bottom: 4px;
}

.auth-modal__subtitle {
  text-align: center;
  font-size: 14px;
  color: var(--gray-500);
  font-weight: 500;
  margin-bottom: 24px;
}

.auth-modal__field { margin-bottom: 16px; }

.auth-modal__label {
  display: block;
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--black);
}

.auth-modal__input,
.auth-modal__select {
  width: 100%;
  padding: 12px 14px;
  border: var(--border-medium);
  border-radius: var(--radius-sm);
  font-size: 14px;
  transition: all var(--transition);
  outline: none;
  background: var(--white);
  color: var(--black);
  font-family: inherit;
  box-shadow: 2px 2px 0px var(--gray-200);
}

.auth-modal__input:focus,
.auth-modal__select:focus {
  border-color: var(--yellow-dark);
  box-shadow: 4px 4px 0px var(--yellow);
  transform: translate(-1px, -1px);
}

.auth-modal__submit {
  width: 100%;
  padding: 14px;
  border-radius: var(--radius-sm);
  background: var(--yellow);
  color: var(--black);
  font-size: 16px;
  font-weight: 800;
  border: var(--border-thick);
  box-shadow: var(--shadow-chunky-sm);
  cursor: pointer;
  transition: all var(--transition-bounce);
  margin-top: 8px;
}

.auth-modal__submit:hover {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-chunky);
  background: var(--yellow-dark);
  color: var(--white);
}

.auth-modal__submit:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none;
  box-shadow: var(--shadow-chunky-sm);
}

.auth-modal__error {
  background: #fef2f2;
  border: var(--border-medium);
  border-color: var(--red);
  color: var(--red);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 16px;
  display: none;
}

.auth-modal__error.show { display: block; }

.auth-modal__toggle {
  text-align: center;
  margin-top: 20px;
  font-size: 14px;
  color: var(--gray-400);
}

.auth-modal__toggle button {
  background: none;
  border: none;
  color: var(--black);
  font-weight: 700;
  cursor: pointer;
  font-size: 14px;
  padding: 0;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.auth-modal__toggle button:hover { color: var(--blue-dark); }

.auth-modal__role-hint {
  font-size: 13px;
  font-weight: 600;
  color: var(--gray-600);
  margin-bottom: 20px;
  padding: 12px 16px;
  background: var(--yellow-light);
  border: var(--border-medium);
  border-radius: var(--radius-sm);
  display: none;
}

.auth-modal__role-hint.show { display: block; }

/* ===== Social Login Buttons ===== */
.auth-social {
  margin-bottom: 20px;
  text-align: center;
}

.auth-social__label {
  font-size: 12px;
  font-weight: 600;
  color: var(--gray-400);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.auth-social__buttons {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-bottom: 16px;
}

.auth-social__btn {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  border: var(--border-medium);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-bounce);
  background: var(--white);
  color: var(--black);
  box-shadow: 2px 2px 0px var(--gray-200);
}

.auth-social__btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-chunky-sm);
}

.auth-social__btn--wechat {
  background: #07c160;
  color: var(--white);
  border-color: #06ad56;
}

.auth-social__btn--wechat:hover {
  background: #06ad56;
  border-color: var(--black);
}

.auth-social__btn--qq {
  background: #12b7f5;
  color: var(--white);
  border-color: #0ea5e0;
}

.auth-social__btn--qq:hover {
  background: #0ea5e0;
  border-color: var(--black);
}

.auth-social__icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
}

.auth-social__divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 4px;
}

.auth-social__divider-line {
  flex: 1;
  height: 2px;
  background: var(--gray-200);
  border-radius: 1px;
}

.auth-social__divider-text {
  font-size: 12px;
  font-weight: 600;
  color: var(--gray-400);
  white-space: nowrap;
  letter-spacing: 0.03em;
}

/* ===== Terms Checkboxes ===== */
.auth-modal__terms {
  margin-bottom: 20px;
  padding: 14px 16px;
  background: var(--gray-100);
  border: var(--border-medium);
  border-radius: var(--radius-sm);
}

.auth-modal__terms-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin-bottom: 8px;
  cursor: pointer;
  font-size: 12px;
  font-weight: 500;
  color: var(--gray-600);
  line-height: 1.5;
}

.auth-modal__terms-item:last-child {
  margin-bottom: 0;
}

.auth-modal__terms-item input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border: var(--border-medium);
  border-radius: 4px;
  background: var(--white);
  cursor: pointer;
  flex-shrink: 0;
  margin-top: 1px;
  transition: all var(--transition);
  position: relative;
}

.auth-modal__terms-item input[type="checkbox"]:checked {
  background: var(--yellow);
  border-color: var(--black);
}

.auth-modal__terms-item input[type="checkbox"]:checked::after {
  content: "✓";
  position: absolute;
  top: -1px;
  left: 3px;
  font-size: 12px;
  font-weight: 900;
  color: var(--black);
}

.auth-modal__terms-item a {
  color: var(--blue-dark);
  text-decoration: underline;
  text-underline-offset: 2px;
  font-weight: 600;
}

.auth-modal__terms-item a:hover {
  color: var(--black);
  background: var(--yellow-light);
}

/* ===== Animations ===== */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.5s ease-out, transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .landing-nav {
    padding: 0 16px;
    height: 56px;
  }

  .landing-nav__links { gap: 4px; }
  .landing-nav__link--primary { padding: 6px 12px; font-size: 13px; }
  .landing-nav__link:not(.landing-nav__link--primary):nth-child(-n+2) { display: none; }

  .hero { padding: 100px 16px 60px; min-height: auto; }
  .hero__title { font-size: 36px; }
  .hero__subtitle { font-size: 16px; margin-bottom: 28px; }
  .hero__actions { flex-direction: column; align-items: center; }
  .hero-stats { gap: 16px; margin-top: 36px; }
  .hero-stat { padding: 16px 20px; min-width: 100px; }
  .hero-stat__number { font-size: 28px; }

  .persona-grid,
  .tools-grid,
  .features-grid,
  .testimonial-grid { grid-template-columns: 1fr; }

  .section-title { font-size: 30px; }
  .section-subtitle { font-size: 16px; margin-bottom: 36px; }

  .persona-section { padding: 60px 16px; }
  .tools-section { padding: 60px 16px; }
  .features-section { padding: 60px 16px; }
  .testimonial-section { padding: 60px 16px; }
  .cta-section { padding: 60px 16px; }
  .cta-section h2 { font-size: 30px; }

  .auth-modal { padding: 32px 24px 28px; }
  .trust-bar__logos { gap: 12px; }
  .trust-bar__logo { font-size: 12px; padding: 4px 12px; }

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

@media (max-width: 480px) {
  .hero__title { font-size: 28px; }
  .persona-card { padding: 28px 20px; }
  .feature-card { flex-direction: column; }
  .tools-grid { grid-template-columns: 1fr; }
}