/* =============================================
   CALC PRO — Global Stylesheet
   Stack: Pure HTML + CSS + Vanilla JS
   ============================================= */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Syne:wght@700;800&display=swap');

/* --- CSS Variables --- */
:root {
  --black:   #0d0f12;
  --dark:    #161a20;
  --card:    #1e2330;
  --border:  #2a3040;
  --accent:  #f5a623;
  --accent2: #e8891a;
  --white:   #f0f2f5;
  --muted:   #8a94a6;
  --success: #22c55e;
  --radius:  10px;
  --shadow:  0 4px 24px rgba(0,0,0,0.35);
  --font-head: 'Syne', sans-serif;
  --font-body: 'Inter', sans-serif;
  --max-w: 1100px;
  --nav-h: 64px;
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--black);
  color: var(--white);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
ul { list-style: none; }

/* --- Typography --- */
h1, h2, h3, h4 { font-family: var(--font-head); line-height: 1.2; color: var(--white); }
h1 { font-size: clamp(2rem, 5vw, 3rem); font-weight: 800; }
h2 { font-size: clamp(1.4rem, 3vw, 2rem); font-weight: 700; }
h3 { font-size: 1.15rem; font-weight: 700; }
p  { color: #c5ccd9; margin-bottom: 0.9rem; }
p:last-child { margin-bottom: 0; }

/* --- Layout --- */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 20px; }
.section    { padding: 72px 0; }
.section--sm { padding: 48px 0; }

/* =============================================
   NAVBAR
   ============================================= */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--nav-h);
  background: rgba(13,15,18,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
}
.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}
.nav-logo {
  font-family: var(--font-body);
  display: flex;
  align-items: center;
  gap: 12px;
  white-space: nowrap;
  flex-shrink: 0;
  text-decoration: none;
}
.nav-logo:hover { text-decoration: none; opacity: 0.9; }
.nav-logo .logo-icon {
  width: 40px; height: 40px;
  background: var(--accent);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.nav-logo .logo-icon svg {
  width: 22px; height: 22px;
  display: block;
}
.logo-text-wrap {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}
.logo-text-top {
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.logo-text-main {
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: -0.01em;
}
/* Footer logo slightly smaller */
.footer-brand .nav-logo .logo-icon { width: 36px; height: 36px; border-radius: 9px; }
.footer-brand .nav-logo .logo-icon svg { width: 20px; height: 20px; }
.footer-brand .logo-text-main { font-size: 0.92rem; }
.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: 6px;
  transition: color 0.2s, background 0.2s;
}
.nav-links a:hover, .nav-links a.active {
  color: var(--white);
  background: var(--card);
  text-decoration: none;
}
.nav-toggle { display: none; cursor: pointer; background: none; border: none; color: var(--white); font-size: 1.4rem; padding: 4px; }
.mobile-menu {
  display: none;
  position: fixed;
  top: var(--nav-h);
  left: 0; right: 0;
  background: var(--dark);
  border-bottom: 1px solid var(--border);
  padding: 16px 20px;
  z-index: 999;
  flex-direction: column;
  gap: 4px;
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  color: var(--muted);
  font-size: 1rem;
  font-weight: 500;
  padding: 10px 12px;
  border-radius: 8px;
  transition: color 0.2s, background 0.2s;
}
.mobile-menu a:hover { color: var(--white); background: var(--card); text-decoration: none; }

/* =============================================
   HERO
   ============================================= */
.hero {
  background: linear-gradient(135deg, #0d0f12 0%, #161a20 50%, #1a1e26 100%);
  padding: 80px 0 60px;
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -80px; right: -80px;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(245,166,35,0.12) 0%, transparent 70%);
  pointer-events: none;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(245,166,35,0.12);
  border: 1px solid rgba(245,166,35,0.3);
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: 100px;
  margin-bottom: 20px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.hero h1 { margin-bottom: 16px; }
.hero h1 .highlight { color: var(--accent); }
.hero p.subtitle {
  font-size: 1.05rem;
  color: var(--muted);
  max-width: 600px;
  margin-bottom: 32px;
}
.hero-stats {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
  margin-top: 40px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}
.stat-item .stat-num { font-family: var(--font-head); font-size: 1.6rem; font-weight: 800; color: var(--accent); }
.stat-item .stat-label { font-size: 0.8rem; color: var(--muted); }

/* =============================================
   CALCULATOR CARD
   ============================================= */
.calc-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow);
}
.calc-card-header {
  background: var(--dark);
  border-bottom: 1px solid var(--border);
  padding: 20px 28px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.calc-card-header .calc-icon {
  width: 40px; height: 40px;
  background: rgba(245,166,35,0.15);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem;
  color: var(--accent);
}
.calc-card-header h2 { font-size: 1.1rem; margin: 0; }
.calc-card-header p { font-size: 0.82rem; color: var(--muted); margin: 0; }
.calc-body { padding: 28px; }

/* Form Elements */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group.full { grid-column: 1 / -1; }
.form-group label { font-size: 0.82rem; font-weight: 600; color: var(--muted); letter-spacing: 0.04em; text-transform: uppercase; }
.form-group input, .form-group select {
  background: var(--dark);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--white);
  font-size: 0.95rem;
  font-family: var(--font-body);
  padding: 10px 14px;
  transition: border-color 0.2s, box-shadow 0.2s;
  outline: none;
  width: 100%;
}
.form-group input:focus, .form-group select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(245,166,35,0.15);
}
.form-group input::placeholder { color: var(--muted); }
.form-group select option { background: var(--dark); }
.input-prefix { position: relative; }
.input-prefix input { padding-left: 32px; }
.input-prefix .prefix { position: absolute; left: 12px; top: 50%; transform: translateY(-50%); color: var(--muted); font-size: 0.9rem; pointer-events: none; }

/* Unit toggle */
.unit-toggle {
  display: flex;
  background: var(--dark);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 3px;
  width: fit-content;
  margin-bottom: 20px;
}
.unit-toggle button {
  padding: 6px 18px;
  border-radius: 6px;
  border: none;
  background: transparent;
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font-body);
}
.unit-toggle button.active {
  background: var(--accent);
  color: var(--black);
}

/* Calculate Button */
.btn-calc {
  width: 100%;
  padding: 14px;
  background: var(--accent);
  color: var(--black);
  font-size: 0.95rem;
  font-weight: 700;
  font-family: var(--font-head);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  margin-top: 20px;
  transition: background 0.2s, transform 0.1s;
  letter-spacing: 0.02em;
}
.btn-calc:hover { background: var(--accent2); transform: translateY(-1px); }
.btn-calc:active { transform: translateY(0); }

/* Results */
.results-box {
  margin-top: 24px;
  background: var(--dark);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  display: none;
}
.results-box.show { display: block; }
.results-title {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}
.result-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.result-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px;
}
.result-item .r-label { font-size: 0.75rem; color: var(--muted); font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; margin-bottom: 4px; }
.result-item .r-value { font-family: var(--font-head); font-size: 1.3rem; font-weight: 800; color: var(--white); }
.result-item .r-unit { font-size: 0.75rem; color: var(--muted); font-weight: 500; }
.result-item.accent-item { border-color: rgba(245,166,35,0.4); background: rgba(245,166,35,0.07); }
.result-item.accent-item .r-value { color: var(--accent); }
.result-total {
  background: rgba(245,166,35,0.1);
  border: 1px solid rgba(245,166,35,0.3);
  border-radius: 8px;
  padding: 16px;
  margin-top: 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.result-total .t-label { font-size: 0.85rem; font-weight: 600; color: var(--muted); }
.result-total .t-value { font-family: var(--font-head); font-size: 1.5rem; font-weight: 800; color: var(--accent); }
.result-note { font-size: 0.75rem; color: var(--muted); margin-top: 12px; font-style: italic; }

/* =============================================
   TOOL CARDS GRID (Homepage)
   ============================================= */
.tools-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.tool-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px;
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
  cursor: pointer;
  display: block;
  color: inherit;
}
.tool-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(245,166,35,0.12);
  text-decoration: none;
}
.tool-card-icon {
  width: 48px; height: 48px;
  background: rgba(245,166,35,0.12);
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 14px;
  color: var(--accent);
}
.tool-card h3 { font-size: 1rem; margin-bottom: 6px; color: var(--white); }
.tool-card p { font-size: 0.82rem; color: var(--muted); margin: 0; }
.tool-card .card-arrow {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.8rem;
  color: var(--accent);
  font-weight: 600;
  margin-top: 14px;
}

/* =============================================
   HOW IT WORKS / STEPS
   ============================================= */
.steps-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.step-item { text-align: center; padding: 16px; }
.step-num {
  width: 48px; height: 48px;
  background: var(--accent);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-head);
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--black);
  margin: 0 auto 14px;
}
.step-item h3 { margin-bottom: 6px; }
.step-item p { font-size: 0.85rem; margin: 0; }

/* =============================================
   FAQ
   ============================================= */
.faq-list { max-width: 780px; margin: 0 auto; }
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 10px;
  overflow: hidden;
  background: var(--card);
}
.faq-question {
  width: 100%;
  background: none;
  border: none;
  color: var(--white);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 18px 20px;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  transition: color 0.2s;
}
.faq-question:hover { color: var(--accent); }
.faq-icon { font-size: 1.2rem; color: var(--accent); flex-shrink: 0; transition: transform 0.3s; }
.faq-item.open .faq-icon { transform: rotate(45deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.3s;
  padding: 0 20px;
}
.faq-item.open .faq-answer { max-height: 400px; padding-bottom: 18px; }
.faq-answer p { font-size: 0.9rem; color: #a0aab8; margin: 0; }

/* =============================================
   INFO SECTIONS (content pages)
   ============================================= */
.content-page { padding: 64px 0; }
.content-page h2 { margin: 36px 0 12px; }
.content-page h3 { margin: 24px 0 8px; color: var(--accent); }
.content-page p, .content-page li { color: #c5ccd9; font-size: 0.95rem; line-height: 1.8; }
.content-page ul { list-style: disc; padding-left: 20px; }
.content-page ul li { margin-bottom: 6px; }

/* =============================================
   SECTION HEADINGS
   ============================================= */
.section-head { text-align: center; margin-bottom: 48px; }
.section-head .eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 10px;
}
.section-head h2 { margin-bottom: 10px; }
.section-head p { color: var(--muted); max-width: 540px; margin: 0 auto; font-size: 0.95rem; }

/* =============================================
   CONTACT FORM
   ============================================= */
.contact-grid { display: grid; grid-template-columns: 1fr 1.5fr; gap: 48px; align-items: start; }
.contact-info h2 { margin-bottom: 14px; }
.contact-info p { font-size: 0.95rem; }
.contact-methods { margin-top: 28px; display: flex; flex-direction: column; gap: 14px; }
.contact-method {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.9rem;
  color: var(--muted);
}
.contact-method .m-icon {
  width: 38px; height: 38px;
  background: rgba(245,166,35,0.1);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  color: var(--accent);
  font-size: 1rem;
  flex-shrink: 0;
}
.contact-form-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px;
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.contact-form-card textarea {
  background: var(--dark);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--white);
  font-size: 0.95rem;
  font-family: var(--font-body);
  padding: 12px 14px;
  width: 100%;
  resize: vertical;
  min-height: 120px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.contact-form-card textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(245,166,35,0.15);
}
.success-msg { display: none; background: rgba(34,197,94,0.1); border: 1px solid rgba(34,197,94,0.3); border-radius: 8px; padding: 14px 18px; color: var(--success); font-size: 0.9rem; margin-top: 14px; }
.success-msg.show { display: block; }

/* =============================================
   FOOTER
   ============================================= */
.footer {
  background: var(--dark);
  border-top: 1px solid var(--border);
  padding: 56px 0 28px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand p { font-size: 0.85rem; color: var(--muted); margin-top: 10px; max-width: 280px; }
.footer-col h4 { font-size: 0.8rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); margin-bottom: 14px; }
.footer-col ul { display: flex; flex-direction: column; gap: 8px; }
.footer-col ul li a { font-size: 0.85rem; color: var(--muted); transition: color 0.2s; }
.footer-col ul li a:hover { color: var(--white); text-decoration: none; }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--muted);
  flex-wrap: wrap;
  gap: 8px;
}
.footer-bottom a { color: var(--muted); }
.footer-bottom a:hover { color: var(--white); }

/* =============================================
   PAGE HERO (inner pages)
   ============================================= */
.page-hero {
  background: var(--dark);
  border-bottom: 1px solid var(--border);
  padding: 52px 0 40px;
}
.page-hero .breadcrumb {
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 14px;
}
.page-hero .breadcrumb a { color: var(--muted); }
.page-hero .breadcrumb a:hover { color: var(--accent); text-decoration: none; }
.page-hero h1 { font-size: clamp(1.6rem, 4vw, 2.2rem); margin-bottom: 10px; }
.page-hero p { color: var(--muted); font-size: 0.95rem; max-width: 560px; margin: 0; }

/* =============================================
   UTILITY
   ============================================= */
.text-accent { color: var(--accent); }
.text-center { text-align: center; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-40 { margin-top: 40px; }
.bg-dark { background: var(--dark); }
.divider { border: none; border-top: 1px solid var(--border); margin: 0; }

/* =============================================
   RESPONSIVE
   ============================================= */
@media (max-width: 900px) {
  .tools-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .steps-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .tools-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  .result-grid { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .nav-toggle { display: block; }
  .hero-stats { gap: 20px; }
}
@media (max-width: 400px) {
  .footer-grid { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
}