@import url('https://fonts.googleapis.com/css2?family=DM+Serif+Display:ital@0;1&family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;1,9..40,300&display=swap');

:root {
  --navy: #0f1e2e;
  --navy-mid: #172840;
  --navy-light: #1e3450;
  --teal: #00b09b;
  --teal-light: #00c9b1;
  --gold: #f0a500;
  --white: #ffffff;
  --off-white: #f7f9fb;
  --gray-100: #eef1f5;
  --gray-200: #dde3ec;
  --gray-400: #8a9ab0;
  --gray-600: #4a5e78;
  --text: #0f1e2e;
  --text-soft: #4a5e78;
  --radius: 14px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(15,30,46,0.10);
  --shadow-lg: 0 12px 48px rgba(15,30,46,0.16);
  --transition: 0.22s cubic-bezier(.4,0,.2,1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: 'DM Sans', sans-serif; background: var(--off-white); color: var(--text); line-height: 1.6; font-size: 16px; }

nav { background: var(--navy); padding: 0 5%; display: flex; align-items: center; justify-content: space-between; height: 64px; position: sticky; top: 0; z-index: 100; box-shadow: 0 2px 16px rgba(0,0,0,0.18); }
.nav-logo { font-family: 'DM Serif Display', serif; color: var(--white); font-size: 1.45rem; text-decoration: none; letter-spacing: -0.02em; }
.nav-logo span { color: var(--teal); }
.nav-links { display: flex; gap: 2rem; }
.nav-links a { color: var(--gray-400); text-decoration: none; font-size: 0.9rem; font-weight: 500; transition: color var(--transition); }
.nav-links a:hover { color: var(--white); }

.hero { background: linear-gradient(135deg, var(--navy) 0%, var(--navy-light) 60%, #163d5a 100%); color: var(--white); padding: 80px 5% 90px; text-align: center; position: relative; overflow: hidden; }
.hero::before { content: ''; position: absolute; inset: 0; background: radial-gradient(ellipse 80% 60% at 50% 110%, rgba(0,176,155,0.18) 0%, transparent 70%); }
.hero-inner { position: relative; max-width: 720px; margin: 0 auto; }
.hero-badge { display: inline-block; background: rgba(0,176,155,0.18); border: 1px solid rgba(0,176,155,0.4); color: var(--teal-light); font-size: 0.78rem; font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase; padding: 6px 16px; border-radius: 100px; margin-bottom: 24px; }
.hero h1 { font-family: 'DM Serif Display', serif; font-size: clamp(2.2rem, 5vw, 3.4rem); line-height: 1.18; letter-spacing: -0.02em; margin-bottom: 20px; }
.hero h1 em { font-style: italic; color: var(--teal-light); }
.hero p { font-size: 1.1rem; color: rgba(255,255,255,0.72); max-width: 520px; margin: 0 auto 36px; font-weight: 300; }
.hero-stats { display: flex; justify-content: center; gap: 40px; flex-wrap: wrap; }
.stat { text-align: center; }
.stat-num { font-family: 'DM Serif Display', serif; font-size: 1.9rem; color: var(--white); display: block; }
.stat-label { font-size: 0.78rem; color: rgba(255,255,255,0.5); text-transform: uppercase; letter-spacing: 0.08em; }

.ad-slot { background: var(--gray-100); border: 2px dashed var(--gray-200); border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; color: var(--gray-400); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.08em; font-weight: 500; }
.ad-slot-leaderboard { width: 100%; height: 90px; max-width: 728px; margin: 24px auto; }
.ad-slot-rectangle { width: 300px; height: 250px; }
.ad-slot-inline { width: 100%; height: 90px; margin: 20px 0; }

.section { padding: 64px 5%; }
.section-header { text-align: center; margin-bottom: 48px; }
.section-header h2 { font-family: 'DM Serif Display', serif; font-size: clamp(1.7rem, 3.5vw, 2.4rem); letter-spacing: -0.02em; margin-bottom: 12px; }
.section-header p { color: var(--text-soft); max-width: 520px; margin: 0 auto; }

.calc-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; max-width: 1200px; margin: 0 auto; }
.calc-card { background: var(--white); border-radius: var(--radius); padding: 28px 24px; text-decoration: none; color: inherit; box-shadow: var(--shadow); border: 1px solid var(--gray-100); transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition); display: flex; flex-direction: column; gap: 12px; position: relative; overflow: hidden; }
.calc-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: linear-gradient(90deg, var(--teal), var(--teal-light)); transform: scaleX(0); transform-origin: left; transition: transform var(--transition); }
.calc-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--gray-200); }
.calc-card:hover::before { transform: scaleX(1); }
.calc-icon { width: 48px; height: 48px; background: linear-gradient(135deg, #e8f8f6, #d0f2ee); border-radius: 12px; display: flex; align-items: center; justify-content: center; font-size: 1.4rem; }
.calc-card h3 { font-size: 1.05rem; font-weight: 600; letter-spacing: -0.01em; }
.calc-card p { font-size: 0.875rem; color: var(--text-soft); line-height: 1.5; flex: 1; }
.calc-card .card-cta { font-size: 0.82rem; font-weight: 600; color: var(--teal); display: flex; align-items: center; gap: 4px; }

.calc-page { max-width: 1100px; margin: 0 auto; padding: 40px 5%; }
.calc-page-grid { display: grid; grid-template-columns: 1fr 320px; gap: 32px; align-items: start; }
@media(max-width:900px){ .calc-page-grid { grid-template-columns: 1fr; } }

.calc-main { background: var(--white); border-radius: var(--radius); box-shadow: var(--shadow); padding: 36px; border: 1px solid var(--gray-100); }
.calc-title-area { margin-bottom: 32px; }
.calc-title-area h1 { font-family: 'DM Serif Display', serif; font-size: clamp(1.6rem, 3vw, 2.1rem); letter-spacing: -0.02em; margin-bottom: 8px; }
.calc-title-area p { color: var(--text-soft); font-size: 0.95rem; }

.field-group { margin-bottom: 20px; }
.field-group label { display: block; font-size: 0.85rem; font-weight: 600; color: var(--gray-600); margin-bottom: 8px; text-transform: uppercase; letter-spacing: 0.06em; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.input-wrap { position: relative; }
.input-prefix, .input-suffix { position: absolute; top: 50%; transform: translateY(-50%); color: var(--gray-400); font-size: 0.95rem; font-weight: 500; pointer-events: none; }
.input-prefix { left: 14px; }
.input-suffix { right: 14px; }
.input-wrap input { padding-left: 28px; }
.input-wrap.has-suffix input { padding-right: 40px; }

input[type="number"], input[type="text"], select { width: 100%; padding: 12px 14px; border: 1.5px solid var(--gray-200); border-radius: var(--radius-sm); font-size: 1rem; font-family: 'DM Sans', sans-serif; color: var(--text); background: var(--off-white); transition: border-color var(--transition), box-shadow var(--transition); -moz-appearance: textfield; }
input::-webkit-outer-spin-button, input::-webkit-inner-spin-button { -webkit-appearance: none; }
input:focus, select:focus { outline: none; border-color: var(--teal); box-shadow: 0 0 0 3px rgba(0,176,155,0.12); background: var(--white); }
select { cursor: pointer; appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%238a9ab0' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 14px center; padding-right: 36px; }

.range-wrap { display: flex; flex-direction: column; gap: 6px; }
input[type="range"] { width: 100%; height: 6px; padding: 0; border: none; border-radius: 100px; background: var(--gray-200); accent-color: var(--teal); cursor: pointer; }
.range-val { font-size: 0.85rem; color: var(--text-soft); text-align: right; font-weight: 500; }

.btn-calculate { width: 100%; padding: 14px 24px; background: linear-gradient(135deg, var(--teal), var(--teal-light)); color: var(--white); border: none; border-radius: var(--radius-sm); font-size: 1rem; font-weight: 600; font-family: 'DM Sans', sans-serif; cursor: pointer; transition: transform var(--transition), box-shadow var(--transition); letter-spacing: 0.02em; margin-top: 8px; }
.btn-calculate:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,176,155,0.35); }
.btn-calculate:active { transform: translateY(0); }

.results-panel { margin-top: 28px; background: linear-gradient(135deg, var(--navy), var(--navy-light)); border-radius: var(--radius); padding: 28px; color: var(--white); display: none; animation: fadeUp 0.3s ease; }
.results-panel.show { display: block; }
@keyframes fadeUp { from { opacity:0; transform:translateY(12px); } to { opacity:1; transform:translateY(0); } }
.results-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 20px; margin-bottom: 20px; }
.result-item { text-align: center; }
.result-label { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.1em; color: rgba(255,255,255,0.5); margin-bottom: 6px; }
.result-value { font-family: 'DM Serif Display', serif; font-size: 1.9rem; color: var(--white); line-height: 1; }
.result-value.highlight { color: var(--teal-light); }
.breakdown-table { width: 100%; border-collapse: collapse; margin-top: 16px; }
.breakdown-table th { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.1em; color: rgba(255,255,255,0.45); text-align: left; padding: 8px 0; border-bottom: 1px solid rgba(255,255,255,0.1); }
.breakdown-table td { padding: 10px 0; font-size: 0.9rem; border-bottom: 1px solid rgba(255,255,255,0.07); color: rgba(255,255,255,0.85); }
.breakdown-table td:last-child { text-align: right; font-weight: 500; }

.calc-sidebar { display: flex; flex-direction: column; gap: 20px; }
.sidebar-card { background: var(--white); border-radius: var(--radius); box-shadow: var(--shadow); padding: 24px; border: 1px solid var(--gray-100); }
.sidebar-card h4 { font-size: 0.9rem; font-weight: 600; margin-bottom: 12px; color: var(--navy); }
.related-links { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.related-links a { display: flex; align-items: center; gap: 8px; font-size: 0.875rem; color: var(--gray-600); text-decoration: none; padding: 8px 12px; border-radius: var(--radius-sm); background: var(--off-white); transition: background var(--transition), color var(--transition); }
.related-links a:hover { background: #e8f8f6; color: var(--teal); }

.seo-content { max-width: 780px; margin: 48px auto 0; padding: 0 5%; }
.seo-content h2 { font-family: 'DM Serif Display', serif; font-size: 1.5rem; margin-bottom: 16px; margin-top: 32px; letter-spacing: -0.01em; }
.seo-content p { color: var(--text-soft); line-height: 1.75; margin-bottom: 16px; }
.seo-content ul { color: var(--text-soft); padding-left: 20px; margin-bottom: 16px; line-height: 1.9; }
.faq-item { border-bottom: 1px solid var(--gray-200); padding: 20px 0; }
.faq-q { font-weight: 600; margin-bottom: 8px; }
.faq-a { color: var(--text-soft); font-size: 0.95rem; line-height: 1.7; }

.breadcrumb { padding: 16px 5%; max-width: 1100px; margin: 0 auto; font-size: 0.82rem; color: var(--gray-400); display: flex; gap: 8px; align-items: center; }
.breadcrumb a { color: var(--teal); text-decoration: none; }

footer { background: var(--navy); color: rgba(255,255,255,0.55); padding: 48px 5% 32px; margin-top: 80px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; max-width: 1200px; margin: 0 auto 40px; }
@media(max-width:768px){ .footer-grid { grid-template-columns: 1fr 1fr; } }
.footer-brand p { font-size: 0.875rem; line-height: 1.7; margin-top: 12px; max-width: 280px; }
.footer-col h5 { color: var(--white); font-size: 0.85rem; font-weight: 600; margin-bottom: 16px; text-transform: uppercase; letter-spacing: 0.08em; }
.footer-col a { display: block; color: rgba(255,255,255,0.5); text-decoration: none; font-size: 0.875rem; margin-bottom: 10px; transition: color var(--transition); }
.footer-col a:hover { color: var(--teal-light); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 24px; text-align: center; font-size: 0.8rem; max-width: 1200px; margin: 0 auto; }
.disclaimer { font-size: 0.75rem; color: rgba(255,255,255,0.35); margin-top: 8px; max-width: 700px; margin-left: auto; margin-right: auto; }

@media(max-width:640px){ .hero { padding: 56px 5% 64px; } .hero-stats { gap: 24px; } .calc-main { padding: 24px 20px; } .field-row { grid-template-columns: 1fr; } nav { padding: 0 4%; } .nav-links { display: none; } }