/* =========================================================
   Google AI Pro — Global CSS Design System
   Google-inspired: minimalist, clean, premium
   ========================================================= */

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

/* --- Variables --- */
:root {
  --c-bg:          #ffffff;
  --c-bg-alt:      #f8f9fa;
  --c-surface:     #ffffff;
  --c-border:      #e8eaed;
  --c-border-hover:#dadce0;
  --c-text-primary:#202124;
  --c-text-sec:    #5f6368;
  --c-text-hint:   #9aa0a6;

  --c-blue:        #1a73e8;
  --c-blue-dark:   #1557b0;
  --c-blue-light:  #e8f0fe;
  --c-blue-mid:    #4285f4;

  --c-green:       #34a853;
  --c-green-light: #e6f4ea;
  --c-red:         #ea4335;
  --c-red-light:   #fce8e6;
  --c-yellow:      #fbbc04;
  --c-purple:      #9c27b0;

  --c-google-g:    linear-gradient(135deg, #4285f4, #34a853, #fbbc04, #ea4335);

  --radius-sm:     6px;
  --radius-md:     12px;
  --radius-lg:     24px;
  --radius-xl:     32px;
  --radius-pill:   999px;

  --shadow-xs:     0 1px 2px rgba(60,64,67,.08);
  --shadow-sm:     0 1px 3px rgba(60,64,67,.12), 0 1px 2px rgba(60,64,67,.08);
  --shadow-md:     0 4px 12px rgba(60,64,67,.12), 0 2px 4px rgba(60,64,67,.08);
  --shadow-lg:     0 8px 32px rgba(60,64,67,.14), 0 4px 8px rgba(60,64,67,.1);
  --shadow-xl:     0 20px 60px rgba(60,64,67,.18);

  --font-main:     'Google Sans', 'Roboto', system-ui, sans-serif;
  --font-display:  'Google Sans Display', 'Google Sans', sans-serif;

  --t-fast:        150ms cubic-bezier(.2,0,0,1);
  --t-med:         250ms cubic-bezier(.2,0,0,1);
  --t-slow:        400ms cubic-bezier(.2,0,0,1);

  --header-h:      64px;
  --max-w:         1200px;
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-main);
  font-size: 14px;
  line-height: 1.6;
  color: var(--c-text-primary);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--c-blue); text-decoration: none; }
a:hover { text-decoration: underline; }
button { cursor: pointer; font-family: inherit; }
input, select, textarea { font-family: inherit; }

/* --- Typography --- */
h1 { font-family: var(--font-display); font-size: clamp(28px, 5vw, 48px); font-weight: 400; line-height: 1.2; }
h2 { font-family: var(--font-display); font-size: clamp(20px, 3vw, 32px); font-weight: 400; }
h3 { font-size: 18px; font-weight: 500; }
h4 { font-size: 15px; font-weight: 500; }
p  { margin-bottom: 8px; }

/* --- Header --- */
.header {
  position: sticky; top: 0; z-index: 100;
  height: var(--header-h);
  display: flex; align-items: center;
  padding: 0 24px;
  background: rgba(255,255,255,.96);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-border);
}
.header__logo {
  display: flex; align-items: center; gap: 8px;
  font-size: 20px; font-weight: 500;
  color: var(--c-text-primary); text-decoration: none;
}
.header__logo svg { width: 28px; height: 28px; }
.header__logo:hover { text-decoration: none; }
.header__nav { margin-left: auto; display: flex; align-items: center; gap: 8px; }

/* --- Buttons --- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 0 24px; height: 40px;
  border-radius: var(--radius-pill);
  font-size: 14px; font-weight: 500; letter-spacing: .01em;
  border: none; outline: none;
  transition: background var(--t-fast), box-shadow var(--t-fast), transform var(--t-fast);
  white-space: nowrap;
}
.btn:hover { text-decoration: none; }
.btn:active { transform: scale(.97); }

.btn--primary {
  background: var(--c-blue); color: #fff;
}
.btn--primary:hover { background: var(--c-blue-dark); box-shadow: var(--shadow-sm); color: #fff; }

.btn--outline {
  background: transparent; color: var(--c-blue);
  border: 1px solid var(--c-border);
}
.btn--outline:hover { background: var(--c-blue-light); border-color: var(--c-blue); color: var(--c-blue); }

.btn--ghost {
  background: transparent; color: var(--c-text-sec);
  border: 1px solid var(--c-border);
}
.btn--ghost:hover { background: var(--c-bg-alt); color: var(--c-text-primary); }

.btn--lg { height: 48px; padding: 0 32px; font-size: 16px; border-radius: var(--radius-pill); }
.btn--sm { height: 32px; padding: 0 16px; font-size: 13px; }

.btn--full { width: 100%; }

.btn--google {
  background: var(--c-blue); color: #fff;
  box-shadow: var(--shadow-sm);
}
.btn--google:hover { background: var(--c-blue-dark); box-shadow: var(--shadow-md); color: #fff; }

/* --- Hero Section --- */
.hero {
  text-align: center;
  padding: 80px 24px 64px;
  max-width: var(--max-w);
  margin: 0 auto;
}
.hero__eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 16px;
  background: var(--c-blue-light);
  border-radius: var(--radius-pill);
  font-size: 13px; font-weight: 500; color: var(--c-blue);
  margin-bottom: 24px;
}
.hero__title { color: var(--c-text-primary); margin-bottom: 16px; }
.hero__title span {
  background: var(--c-google-g);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero__subtitle { font-size: 18px; color: var(--c-text-sec); max-width: 600px; margin: 0 auto 32px; }

/* --- Pricing Card --- */
.pricing-section {
  padding: 0 24px 80px;
  max-width: var(--max-w);
  margin: 0 auto;
}
.pricing-card {
  max-width: 480px;
  margin: 0 auto;
  border: 2px solid var(--c-blue);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  position: relative;
}
.pricing-card__badge {
  position: absolute; top: 16px; right: 16px;
  background: var(--c-blue); color: #fff;
  font-size: 12px; font-weight: 600; padding: 3px 10px;
  border-radius: var(--radius-pill);
  letter-spacing: .05em; text-transform: uppercase;
}
.pricing-card__header {
  background: linear-gradient(135deg, #1a73e8 0%, #4285f4 100%);
  color: #fff;
  padding: 32px 32px 28px;
}
.pricing-card__name { font-size: 22px; font-weight: 600; margin-bottom: 4px; }
.pricing-card__tagline { font-size: 14px; opacity: .88; margin-bottom: 20px; }
.pricing-card__price { display: flex; align-items: baseline; gap: 4px; }
.pricing-card__amount { font-size: 40px; font-weight: 700; line-height: 1; }
.pricing-card__period { font-size: 15px; opacity: .8; }
.pricing-card__promo {
  display: inline-flex; align-items: center; gap: 6px;
  margin-top: 8px;
  background: rgba(255,255,255,.2);
  border-radius: var(--radius-pill);
  padding: 4px 12px;
  font-size: 13px;
}
.pricing-card__body {
  padding: 24px 32px 32px;
  background: var(--c-surface);
}
.pricing-card__cta { margin-bottom: 24px; }

/* --- Feature List --- */
.feature-list { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.feature-list li {
  display: flex; align-items: flex-start; gap: 12px;
  font-size: 14px; color: var(--c-text-sec);
}
.feature-list li::before {
  content: '✓';
  display: inline-flex; align-items: center; justify-content: center;
  width: 20px; height: 20px; min-width: 20px;
  background: var(--c-green-light); color: var(--c-green);
  border-radius: 50%; font-size: 11px; font-weight: 700;
  margin-top: 1px;
}
.feature-list li strong { color: var(--c-text-primary); }

/* --- Features Grid --- */
.features-section {
  padding: 64px 24px;
  background: var(--c-bg-alt);
}
.features-section h2 {
  text-align: center; margin-bottom: 8px;
}
.features-section .subtitle {
  text-align: center; color: var(--c-text-sec); font-size: 16px; margin-bottom: 48px;
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  max-width: var(--max-w);
  margin: 0 auto;
}
.feature-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: box-shadow var(--t-med), border-color var(--t-med), transform var(--t-med);
}
.feature-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--c-border-hover);
  transform: translateY(-2px);
}
.feature-card__icon {
  width: 44px; height: 44px;
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  display: flex; align-items: center; justify-content: center;
}
.feature-card__icon svg {
  width: 22px; height: 22px; flex-shrink: 0;
}
.feature-card__title { font-size: 15px; font-weight: 600; margin-bottom: 6px; }
.feature-card__desc { font-size: 13px; color: var(--c-text-sec); line-height: 1.5; }

/* --- Trust bar --- */
.trust-bar {
  display: flex; align-items: center; justify-content: center;
  flex-wrap: wrap; gap: 32px;
  padding: 32px 24px;
  border-top: 1px solid var(--c-border);
  border-bottom: 1px solid var(--c-border);
}
.trust-item {
  display: flex; align-items: center; gap: 8px;
  font-size: 13px; color: var(--c-text-sec); font-weight: 500;
}
.trust-item svg { width: 18px; height: 18px; color: var(--c-green); }

/* --- Footer --- */
.footer {
  padding: 32px 24px;
  text-align: center;
  color: var(--c-text-hint);
  font-size: 12px;
  border-top: 1px solid var(--c-border);
}
.footer a { color: var(--c-text-hint); }
.footer a:hover { color: var(--c-text-sec); }

/* --- Form elements --- */
.form-group { margin-bottom: 20px; }
.form-label {
  display: block;
  font-size: 13px; font-weight: 500;
  color: var(--c-text-primary);
  margin-bottom: 6px;
}
.form-control {
  width: 100%;
  height: 44px;
  padding: 0 14px;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  background: var(--c-surface);
  color: var(--c-text-primary);
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
  outline: none;
}
.form-control:focus {
  border-color: var(--c-blue);
  box-shadow: 0 0 0 3px rgba(26,115,232,.15);
}
.form-control::placeholder { color: var(--c-text-hint); }
.form-hint { font-size: 12px; color: var(--c-text-hint); margin-top: 4px; }

/* --- Alerts --- */
.alert {
  display: flex; align-items: flex-start; gap: 12px;
  padding: 14px 18px;
  border-radius: var(--radius-md);
  font-size: 14px;
  margin-bottom: 16px;
}
.alert--error   { background: var(--c-red-light);   color: #c5221f; border: 1px solid #f5c6c4; }
.alert--success { background: var(--c-green-light);  color: #1e6e28; border: 1px solid #c6e9c9; }
.alert--info    { background: var(--c-blue-light);   color: var(--c-blue); border: 1px solid #c6d9f8; }
.alert--warn    { background: #fff8e1; color: #977200; border: 1px solid #ffe082; }

/* --- Loading spinner --- */
.spinner {
  display: inline-block;
  width: 20px; height: 20px;
  border: 2px solid var(--c-border);
  border-top-color: var(--c-blue);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* --- Fade in animation --- */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}
.fade-up { animation: fadeUp .5s var(--t-slow) both; }
.fade-up--1 { animation-delay: .05s; }
.fade-up--2 { animation-delay: .12s; }
.fade-up--3 { animation-delay: .20s; }
.fade-up--4 { animation-delay: .28s; }

/* --- Divider --- */
.divider {
  display: flex; align-items: center; gap: 12px;
  color: var(--c-text-hint); font-size: 13px;
  margin: 24px 0;
}
.divider::before, .divider::after {
  content: ''; flex: 1; height: 1px; background: var(--c-border);
}

/* --- Method selector cards --- */
.method-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-bottom: 24px; }
.method-card {
  border: 2px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 16px;
  cursor: pointer;
  transition: border-color var(--t-fast), background var(--t-fast), box-shadow var(--t-fast);
  text-align: center;
}
.method-card:hover { border-color: var(--c-blue-mid); background: var(--c-blue-light); }
.method-card.active { border-color: var(--c-blue); background: var(--c-blue-light); box-shadow: 0 0 0 4px rgba(26,115,232,.1); }
.method-card__icon { font-size: 28px; margin-bottom: 8px; }
.method-card__title { font-size: 13px; font-weight: 600; color: var(--c-text-primary); }
.method-card__sub   { font-size: 11px; color: var(--c-text-sec); margin-top: 2px; }

/* --- Responsive --- */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .header { padding: 0 16px; }
  .header__nav .btn--ghost { display: none; }
  .hero { padding: 48px 16px 40px; }
  .hero__subtitle { font-size: 16px; }
  .pricing-section { padding: 0 16px 48px; }
  .pricing-card__header, .pricing-card__body { padding: 20px; }
  .features-section { padding: 48px 16px; }
  .features-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .feature-card { padding: 16px; }
  .feature-card__icon { width: 36px; height: 36px; margin-bottom: 12px; }
  .feature-card__title { font-size: 13px; }
  .feature-card__desc { font-size: 12px; }
  .trust-bar { gap: 16px; padding: 20px 16px; }
  .method-cards { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
  .btn--lg { height: 44px; padding: 0 24px; font-size: 15px; }
  .pricing-card__amount { font-size: 32px; }
  .features-grid { grid-template-columns: 1fr; gap: 10px; }
  .method-cards { grid-template-columns: 1fr; }
  .hero__subtitle { font-size: 15px; }
  .trust-bar { flex-direction: column; gap: 10px; align-items: flex-start; padding: 16px; }
}

/* --- Toast Notification --- */
#toast-container {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--c-surface);
  color: #fff;
  padding: 12px 24px;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  font-size: 14px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 12px;
  z-index: 9999;
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  pointer-events: none;
}
#toast-container.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}
#toast-container.toast-error { background: var(--c-red); }
#toast-container.toast-success { background: var(--c-green); }
#toast-container.toast-info { background: var(--c-blue); }