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

:root[data-theme="dark"] {
  --bg: #0f1117; --bg2: #161b27; --bg3: #0f1117;
  --border: #1e2638; --border2: #252d42;
  --text: #e8eaf0; --text2: #8892aa; --text3: #6c7a9c;
  --accent: #6c63ff; --accent2: #48cfad;
  --shadow: 0 8px 40px rgba(0,0,0,0.4);
  --result-bg: linear-gradient(135deg,#1a1f35,#161b2a);
  --toggle-bg: #1e2638;
}
:root[data-theme="light"] {
  --bg: #f4f6fb; --bg2: #ffffff; --bg3: #f0f2f8;
  --border: #e2e6f0; --border2: #d0d6e8;
  --text: #1a1d2e; --text2: #4a5270; --text3: #7a85a8;
  --accent: #5b52f0; --accent2: #2fb89a;
  --shadow: 0 4px 24px rgba(91,82,240,0.08);
  --result-bg: linear-gradient(135deg,#f0eeff,#e8f8f4);
  --toggle-bg: #e2e6f0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg); color: var(--text);
  min-height: 100vh; transition: background 0.3s, color 0.3s;
  display: flex;
  flex-direction: column;
}

main { flex: 1; }

/* ── Header ── */
header {
  background: var(--bg2); border-bottom: 1px solid var(--border);
  padding: 14px 28px; position: sticky; top: 0; z-index: 100;
  transition: background 0.3s;
}
.header-inner { max-width: 1100px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; }
.logo {
  font-size: 1.35rem; font-weight: 800; text-decoration: none; letter-spacing: -0.5px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.header-right { display: flex; align-items: center; gap: 24px; }
nav a { color: var(--text3); text-decoration: none; font-size: 0.9rem; margin-left: 20px; transition: color 0.2s; }
nav a:hover { color: var(--text); }

/* Theme toggle */
.toggle-wrap { display: flex; align-items: center; gap: 8px; font-size: 0.85rem; color: var(--text3); }
.toggle {
  width: 44px; height: 24px; background: var(--toggle-bg);
  border-radius: 99px; position: relative; cursor: pointer;
  border: none; transition: background 0.3s; flex-shrink: 0;
}
.toggle::after {
  content: ''; position: absolute;
  width: 18px; height: 18px; background: var(--accent);
  border-radius: 50%; top: 3px; left: 3px; transition: transform 0.3s;
}
[data-theme="light"] .toggle::after { transform: translateX(20px); }

/* ── Footer ── */
footer {
  border-top: 1px solid var(--border); padding: 24px 28px;
  background: var(--bg2); transition: background 0.3s;
}
.footer-inner {
  max-width: 1100px; margin: 0 auto;
  display: flex; justify-content: space-between; align-items: center;
  font-size: 0.85rem; color: var(--text3); flex-wrap: wrap; gap: 10px;
}
footer nav a { color: var(--text3); text-decoration: none; margin-left: 16px; }
footer nav a:hover { color: var(--accent); }

/* ── Homepage Hub ── */
.hub { max-width: 1100px; margin: 0 auto; padding: 0 24px 80px; }

.hub-hero { text-align: center; padding: 60px 20px 48px; }
.hub-hero h1 {
  font-size: 3rem; font-weight: 800; letter-spacing: -1.5px;
  line-height: 1.1; margin-bottom: 14px; color: var(--text);
}
.hub-hero h1 span {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.hub-hero p { color: var(--text2); font-size: 1.1rem; max-width: 500px; margin: 0 auto; }

.hub-section-title {
  font-size: 1rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.1em; color: var(--text3);
  margin: 0 0 16px; padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.calc-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 14px; margin-bottom: 48px; }
.calc-card {
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: 16px; padding: 22px 20px;
  text-decoration: none; display: block;
  transition: transform 0.15s, box-shadow 0.15s, border-color 0.15s;
}
.calc-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--accent); }
.calc-card .icon { font-size: 1.8rem; margin-bottom: 10px; }
.calc-card .name { font-size: 1rem; font-weight: 700; color: var(--text); margin-bottom: 4px; }
.calc-card .desc { font-size: 0.82rem; color: var(--text3); line-height: 1.5; }

/* ── Calculator Page ── */
.calc-page { max-width: 740px; margin: 0 auto; padding: 0 20px 80px; }

.calc-hero { padding: 48px 0 36px; }
.calc-hero h1 { font-size: 2.4rem; font-weight: 800; letter-spacing: -1px; margin-bottom: 10px; color: var(--text); }
.calc-hero p { color: var(--text2); font-size: 1rem; }

.card {
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: 20px; padding: 32px; margin-bottom: 28px;
  box-shadow: var(--shadow); transition: background 0.3s, border 0.3s;
}

/* Fields */
.field { margin-bottom: 22px; }
.field label {
  display: block; font-size: 0.75rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.09em;
  color: var(--text3); margin-bottom: 10px;
}
.input-wrap { position: relative; }
.input-prefix {
  position: absolute; left: 16px; top: 50%; transform: translateY(-50%);
  color: var(--accent); font-weight: 700; font-size: 1.05rem; pointer-events: none;
}
input[type="number"] {
  width: 100%; background: var(--bg3); border: 1px solid var(--border2);
  border-radius: 12px; padding: 13px 16px 13px 34px;
  font-size: 1.05rem; color: var(--text); outline: none;
  transition: border 0.2s, box-shadow 0.2s, background 0.3s;
  -moz-appearance: textfield;
}
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button { -webkit-appearance: none; }
input[type="number"]:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(108,99,255,0.12); }
.no-prefix input[type="number"] { padding-left: 16px; }

/* Select dropdowns */
.calc-select {
  width: 100%; background: var(--bg3); border: 1px solid var(--border2);
  border-radius: 12px; padding: 13px 16px;
  font-size: 1.05rem; color: var(--text); outline: none;
  transition: border 0.2s, box-shadow 0.2s, background 0.3s;
  appearance: none; cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath fill='%236c7a9c' d='M0 0l6 8 6-8z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 40px;
}
.calc-select:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(108,99,255,0.12); }

/* Tip buttons */
.tip-btns { display: grid; grid-template-columns: repeat(5,1fr); gap: 8px; margin-bottom: 12px; }
.tip-btn {
  padding: 10px 4px; border: 1px solid var(--border2);
  border-radius: 10px; background: var(--bg3);
  color: var(--text2); cursor: pointer; font-size: 0.9rem;
  font-weight: 600; transition: all 0.15s;
}
.tip-btn:hover { border-color: var(--accent); color: var(--accent); }
.tip-btn.active {
  background: linear-gradient(135deg, var(--accent), #5a54d4);
  color: #fff; border-color: transparent;
  box-shadow: 0 4px 14px rgba(108,99,255,0.35);
}

/* Stepper */
.stepper {
  display: flex; align-items: center; background: var(--bg3);
  border: 1px solid var(--border2); border-radius: 12px;
  overflow: hidden; width: fit-content;
}
.step-btn {
  width: 44px; height: 44px; background: none; border: none;
  color: var(--accent); font-size: 1.4rem; font-weight: 300;
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  transition: background 0.15s;
}
.step-btn:hover { background: var(--border); }
#peopleVal {
  min-width: 48px; text-align: center; font-size: 1.05rem;
  font-weight: 700; color: var(--text);
  border-left: 1px solid var(--border2); border-right: 1px solid var(--border2);
  height: 44px; line-height: 44px;
}

/* Results */
.results {
  background: var(--result-bg); border: 1px solid var(--border);
  border-radius: 16px; padding: 8px 24px; margin: 28px 0 24px;
  transition: background 0.3s;
}
.result-row {
  display: flex; justify-content: space-between; align-items: center;
  padding: 13px 0; border-bottom: 1px solid var(--border);
}
.result-row:last-child { border-bottom: none; }
.result-label { color: var(--text3); font-size: 0.95rem; }
.result-val { font-size: 1.1rem; font-weight: 700; color: var(--text); }
.result-row.highlight .result-label { color: var(--text2); }
.result-row.highlight .result-val {
  font-size: 1.7rem;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}

.reset-btn {
  width: 100%; padding: 12px; background: none;
  border: 1px solid var(--border2); border-radius: 12px;
  color: var(--text3); font-size: 0.9rem; cursor: pointer;
  transition: all 0.2s; font-weight: 500;
}
.reset-btn:hover { border-color: var(--accent); color: var(--accent); background: rgba(108,99,255,0.05); }

/* Article sections */
.section-title {
  font-size: 1.3rem; font-weight: 700; color: var(--text);
  margin: 40px 0 16px; padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}
.guide-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-bottom: 28px; }
.guide-item {
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: 14px; padding: 16px 18px; transition: background 0.3s;
}
.guide-item .service { font-size: 0.88rem; font-weight: 600; color: var(--text); margin-bottom: 4px; }
.guide-item .amount {
  font-size: 0.93rem; font-weight: 700;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}

.prose h2 { font-size: 1.2rem; font-weight: 700; color: var(--text); margin: 32px 0 10px; }
.prose h2:first-child { margin-top: 0; }
.prose p { color: var(--text2); line-height: 1.8; margin-bottom: 14px; font-size: 0.96rem; }
.prose strong { color: var(--text); }

.example-box {
  background: var(--bg3); border: 1px solid var(--border2);
  border-radius: 12px; padding: 18px 20px; margin: 14px 0 20px;
  font-size: 0.92rem; color: var(--text2); line-height: 1.9;
}
.example-box .ex-title {
  font-weight: 700; color: var(--text); margin-bottom: 6px;
  font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.06em;
}
.example-box span { color: var(--accent); font-weight: 600; }

.world-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 12px; margin-bottom: 28px; }
.world-card {
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: 14px; padding: 18px; transition: background 0.3s;
}
.world-card .flag { font-size: 1.6rem; margin-bottom: 8px; }
.world-card .country { font-weight: 700; font-size: 0.95rem; color: var(--text); margin-bottom: 6px; }
.world-card .desc { font-size: 0.83rem; color: var(--text2); line-height: 1.6; }

/* FAQ */
.faq-item {
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: 14px; margin-bottom: 10px; overflow: hidden; transition: background 0.3s;
}
.faq-q {
  width: 100%; background: none; border: none; padding: 16px 20px;
  text-align: left; font-size: 0.97rem; font-weight: 600;
  color: var(--text); cursor: pointer;
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
}
.faq-q:hover { color: var(--accent); }
.faq-icon { font-size: 1.1rem; color: var(--accent); flex-shrink: 0; transition: transform 0.25s; }
.faq-item.open .faq-icon { transform: rotate(45deg); }
.faq-a {
  max-height: 0; overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s;
  font-size: 0.93rem; color: var(--text2); line-height: 1.75; padding: 0 20px;
}
.faq-item.open .faq-a { max-height: 300px; padding: 0 20px 16px; }

/* Blog */
.blog-list { max-width: 740px; margin: 0 auto; padding: 0 20px 80px; }
.blog-hero { padding: 48px 0 36px; }
.blog-hero h1 { font-size: 2.2rem; font-weight: 800; color: var(--text); }
.post-card {
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: 16px; padding: 24px; margin-bottom: 14px;
  text-decoration: none; display: block; transition: border-color 0.15s, transform 0.15s;
}
.post-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.post-date { font-size: 0.78rem; color: var(--text3); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 6px; }
.post-title { font-size: 1.1rem; font-weight: 700; color: var(--text); margin-bottom: 6px; }
.post-excerpt { font-size: 0.88rem; color: var(--text2); line-height: 1.6; }

/* Simple pages (about, privacy, contact) */
.simple-page { max-width: 680px; margin: 0 auto; padding: 48px 20px 80px; flex: 1; width: 100%; }
.simple-page h1 { font-size: 2rem; font-weight: 800; color: var(--text); margin-bottom: 24px; }
.simple-page h2 { font-size: 1.15rem; font-weight: 700; color: var(--text); margin: 28px 0 10px; }
.simple-page p { color: var(--text2); line-height: 1.8; margin-bottom: 14px; font-size: 0.96rem; }
.simple-page a { color: var(--accent); }

/* Contact form */
.contact-form { margin-top: 28px; }
.contact-form .field { margin-bottom: 20px; }
.contact-form label {
  display: block; font-size: 0.75rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.09em;
  color: var(--text3); margin-bottom: 8px;
}
.contact-form input[type="text"],
.contact-form input[type="email"],
.contact-form textarea {
  width: 100%; background: var(--bg3); border: 1px solid var(--border2);
  border-radius: 12px; padding: 12px 16px; font-size: 0.97rem;
  color: var(--text); outline: none; font-family: inherit;
  transition: border 0.2s, box-shadow 0.2s;
}
.contact-form textarea { resize: vertical; }
.contact-form input:focus, .contact-form textarea:focus {
  border-color: var(--accent); box-shadow: 0 0 0 3px rgba(108,99,255,0.12);
}
.contact-submit {
  width: auto; padding: 12px 28px;
  background: linear-gradient(135deg, var(--accent), #5a54d4);
  color: #fff; border: none; font-weight: 600;
}
.contact-submit:hover { color: #fff; background: linear-gradient(135deg, #5a54d4, var(--accent)); }

/* Responsive */
@media (max-width: 640px) {
  .hub-hero h1 { font-size: 2.1rem; }
  .calc-hero h1 { font-size: 1.8rem; }
  .guide-grid { grid-template-columns: 1fr; }
  .world-grid { grid-template-columns: 1fr 1fr; }
  nav { display: none; }
  .footer-inner { flex-direction: column; text-align: center; }
  footer nav a { margin: 0 8px; }
}