/* ═══════════════════════════════════════════════
   CalcMitra – style.css
   Design: Clean Financial Dark/Light
   Font: Sora (display) + JetBrains Mono (numbers)
═══════════════════════════════════════════════ */

/* ─── CSS Variables ─── */
:root {
  --bg:          #f8fafc;
  --bg2:         #f1f5f9;
  --bg3:         #e2e8f0;
  --surface:     #ffffff;
  --border:      #e2e8f0;
  --text:        #0f172a;
  --text2:       #475569;
  --text3:       #94a3b8;
  --accent:      #6366f1;
  --accent2:     #8b5cf6;
  --accent-glow: rgba(99,102,241,0.18);
  --green:       #10b981;
  --red:         #ef4444;
  --amber:       #f59e0b;
  --radius:      14px;
  --radius-sm:   8px;
  --shadow:      0 4px 24px rgba(0,0,0,0.06);
  --shadow-lg:   0 8px 48px rgba(0,0,0,0.12);
  --transition:  0.22s cubic-bezier(0.4,0,0.2,1);
  --header-h:    64px;
}

[data-theme="dark"] {
  --bg:      #0a0f1e;
  --bg2:     #0f172a;
  --bg3:     #1e293b;
  --surface: #1e293b;
  --border:  #334155;
  --text:    #f1f5f9;
  --text2:   #94a3b8;
  --text3:   #475569;
  --shadow:      0 4px 24px rgba(0,0,0,0.4);
  --shadow-lg:   0 8px 48px rgba(0,0,0,0.6);
}

/* ─── Reset ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: 'Sora', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
}

/* ─── Typography ─── */
h1 { font-size: clamp(2rem, 5vw, 3.2rem); font-weight: 800; line-height: 1.15; }
h2 { font-size: clamp(1.4rem, 3vw, 2rem); font-weight: 700; }
h3 { font-size: 1.1rem; font-weight: 700; }
h4 { font-size: 0.9rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text3); }
p  { color: var(--text2); }
a  { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.gradient-text {
  background: linear-gradient(135deg, var(--accent), var(--accent2), #ec4899);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ═══════════════ HEADER ═══════════════ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-h);
  background: rgba(var(--surface-rgb, 255,255,255), 0.85);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), border-color var(--transition);
}

[data-theme="dark"] .site-header {
  background: rgba(10,15,30,0.85);
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}
.logo-icon { font-size: 1.5rem; }
.logo-text strong { color: var(--accent); }

.main-nav { display: flex; gap: 0.25rem; }
.main-nav a {
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text2);
  transition: background var(--transition), color var(--transition);
}
.main-nav a:hover { background: var(--bg2); color: var(--text); text-decoration: none; }

.header-actions { display: flex; align-items: center; gap: 0.5rem; }

.dark-toggle {
  width: 40px; height: 40px;
  border-radius: 50%;
  border: 1.5px solid var(--border);
  background: var(--surface);
  cursor: pointer;
  font-size: 1.1rem;
  display: flex; align-items: center; justify-content: center;
  transition: background var(--transition), border var(--transition), transform 0.2s;
}
.dark-toggle:hover { transform: scale(1.1); }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 40px; height: 40px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  cursor: pointer;
  padding: 10px 9px;
  justify-content: center;
}
.hamburger span {
  display: block;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.2s;
}

/* ═══════════════ PAGES ═══════════════ */
.page { display: none; min-height: calc(100vh - var(--header-h)); }
.page.active { display: block; animation: fadeUp 0.4s ease both; }

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

/* ═══════════════ HERO ═══════════════ */
.hero {
  position: relative;
  overflow: hidden;
  padding: 5rem 1.5rem 4rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1280px;
  margin: 0 auto;
  gap: 2rem;
}

.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 40px 40px;
  opacity: 0.5;
  pointer-events: none;
}

.hero-content { position: relative; max-width: 600px; }

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--accent-glow);
  border: 1px solid var(--accent);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.3rem 0.8rem;
  border-radius: 999px;
  margin-bottom: 1.2rem;
  letter-spacing: 0.04em;
}

.hero-title { margin-bottom: 1rem; }
.hero-subtitle { font-size: 1.15rem; color: var(--text2); margin-bottom: 2rem; max-width: 480px; }

/* Search */
.search-wrapper {
  position: relative;
  max-width: 500px;
}
.search-icon {
  position: absolute;
  left: 1rem; top: 50%;
  transform: translateY(-50%);
  font-size: 1rem;
  pointer-events: none;
}
.search-input {
  width: 100%;
  padding: 0.85rem 3.5rem 0.85rem 2.8rem;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font-family: 'Sora', sans-serif;
  font-size: 0.95rem;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}
.search-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-glow);
}
.search-input::placeholder { color: var(--text3); }
.search-shortcut {
  position: absolute;
  right: 1rem; top: 50%;
  transform: translateY(-50%);
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 6px;
  font-size: 0.7rem;
  color: var(--text3);
  font-family: 'JetBrains Mono', monospace;
}

/* Hero visual floaters */
.hero-visual {
  position: relative;
  width: 280px;
  height: 280px;
  flex-shrink: 0;
}
.float-card {
  position: absolute;
  width: 90px; height: 90px;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  gap: 0.2rem;
}
.float-card small { font-size: 0.65rem; font-weight: 600; color: var(--text3); font-family: 'JetBrains Mono', monospace; }
.fc1 { top: 10px; left: 10px; animation: float1 4s ease-in-out infinite; }
.fc2 { top: 10px; right: 10px; animation: float2 4.5s ease-in-out infinite; }
.fc3 { bottom: 10px; left: 10px; animation: float2 3.8s ease-in-out infinite; }
.fc4 { bottom: 10px; right: 10px; animation: float1 5s ease-in-out infinite; }

@keyframes float1 { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-12px)} }
@keyframes float2 { 0%,100%{transform:translateY(0)} 50%{transform:translateY(10px)} }

/* ═══════════════ AD SLOTS ═══════════════ */
.ad-slot {
  max-width: 1280px;
  margin: 1rem auto;
  padding: 0 1.5rem;
}
.ad-slot > span,
.ad-slot > div {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 90px;
  background: var(--bg2);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  color: var(--text3);
  font-size: 0.8rem;
  font-style: italic;
}

/* ═══════════════ CALC SECTION ═══════════════ */
.calc-section {
  max-width: 1280px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}
.section-header { text-align: center; margin-bottom: 2.5rem; }
.section-header h2 { margin-bottom: 0.4rem; }

.calc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1.2rem;
}

.calc-card {
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}
.calc-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--accent-glow), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}
.calc-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--accent); }
.calc-card:hover::before { opacity: 1; }
.calc-card:active { transform: translateY(-2px); }

.card-icon {
  width: 52px; height: 52px;
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 1rem;
  flex-shrink: 0;
}
.calc-card h3 { margin-bottom: 0.4rem; }
.calc-card p  { font-size: 0.88rem; margin-bottom: 0.8rem; }

.card-badge {
  display: inline-block;
  background: var(--bg2);
  border: 1px solid var(--border);
  color: var(--text3);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.no-results { text-align: center; color: var(--text3); font-size: 1rem; padding: 2rem; }

/* ═══════════════ FEATURES STRIP ═══════════════ */
.features-strip {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
  padding: 3rem 1.5rem;
  background: var(--bg2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin-top: 2rem;
}
.feature { display: flex; flex-direction: column; align-items: center; gap: 0.4rem; }
.feature span { font-size: 1.8rem; }
.feature p { font-size: 0.85rem; font-weight: 600; color: var(--text2); margin: 0; }

/* ═══════════════ INNER PAGES ═══════════════ */
.inner-page {
  max-width: 760px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}
.inner-page h1 { margin-bottom: 1.2rem; }
.inner-page h2 { margin: 2rem 0 0.8rem; font-size: 1.3rem; }
.inner-page p  { margin-bottom: 1rem; line-height: 1.8; }
.inner-page ul { padding-left: 0; list-style: none; display: flex; flex-direction: column; gap: 0.6rem; }
.inner-page li { padding: 0.6rem 0; border-bottom: 1px solid var(--border); color: var(--text2); }

.about-list { margin-bottom: 2rem; }

/* Contact Form */
.contact-form { display: flex; flex-direction: column; gap: 1.2rem; margin-top: 1.5rem; }
.form-group { display: flex; flex-direction: column; gap: 0.4rem; }
.form-group label { font-size: 0.88rem; font-weight: 600; color: var(--text2); }
.form-group input, .form-group textarea {
  padding: 0.8rem 1rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg2);
  color: var(--text);
  font-family: 'Sora', sans-serif;
  font-size: 0.95rem;
  transition: border-color var(--transition);
  outline: none;
  resize: vertical;
}
.form-group input:focus, .form-group textarea:focus { border-color: var(--accent); }
.form-note { color: var(--green); font-weight: 600; margin-top: 0.5rem; }

/* Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 0.75rem 1.5rem;
  font-family: 'Sora', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity var(--transition), transform var(--transition);
}
.btn-primary:hover { opacity: 0.9; transform: translateY(-1px); }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: transparent;
  color: var(--text2);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.7rem 1.4rem;
  font-family: 'Sora', sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}
.btn-secondary:hover { background: var(--bg2); color: var(--text); }

/* ═══════════════ FAQ ═══════════════ */
.faq-list { display: flex; flex-direction: column; gap: 0.8rem; margin-top: 1.5rem; }
.faq-item {
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.faq-item summary {
  padding: 1.1rem 1.3rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: '+'; font-size: 1.3rem; color: var(--accent); transition: transform 0.2s; }
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item p { padding: 0 1.3rem 1.1rem; color: var(--text2); font-size: 0.93rem; }

/* ═══════════════ MODAL ═══════════════ */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px);
  z-index: 2000;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  animation: fadeIn 0.2s ease;
}
.modal-overlay.active { display: flex; }

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.modal {
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  width: 100%;
  max-width: 680px;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  animation: slideUp 0.3s cubic-bezier(0.4,0,0.2,1);
  box-shadow: var(--shadow-lg);
}

@keyframes slideUp { from { transform: translateY(40px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }

.modal-close {
  position: sticky;
  top: 1rem;
  float: right;
  margin: 1rem 1rem 0 0;
  width: 36px; height: 36px;
  border-radius: 50%;
  border: 1.5px solid var(--border);
  background: var(--bg2);
  color: var(--text);
  font-size: 1rem;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  z-index: 10;
  transition: background var(--transition);
}
.modal-close:hover { background: var(--red); color: #fff; border-color: var(--red); }

.modal-body { padding: 1.5rem 2rem 2rem; clear: both; }
.modal-body h2 { margin-bottom: 1.5rem; font-size: 1.5rem; }

/* ─── Calc Form ─── */
.calc-form { display: flex; flex-direction: column; gap: 1rem; }
.calc-form .form-group { display: flex; flex-direction: column; gap: 0.4rem; }
.calc-form label { font-size: 0.85rem; font-weight: 600; color: var(--text2); }
.calc-form input, .calc-form select {
  padding: 0.75rem 1rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg2);
  color: var(--text);
  font-family: 'Sora', sans-serif;
  font-size: 1rem;
  font-family: 'JetBrains Mono', monospace;
  outline: none;
  transition: border-color var(--transition);
}
.calc-form input:focus, .calc-form select:focus { border-color: var(--accent); }

.calc-btn {
  margin-top: 0.5rem;
  padding: 0.9rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-family: 'Sora', sans-serif;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: opacity var(--transition), transform var(--transition);
  letter-spacing: 0.02em;
}
.calc-btn:hover { opacity: 0.9; transform: translateY(-1px); }
.calc-btn:active { transform: translateY(0); }

/* ─── Result Panel ─── */
.result-panel {
  margin-top: 1.5rem;
  background: var(--bg2);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  display: none;
  animation: fadeUp 0.3s ease;
}
.result-panel.show { display: block; }
.result-panel h3 { font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text3); margin-bottom: 1rem; }

.result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
  margin-bottom: 1.2rem;
}
.result-item { display: flex; flex-direction: column; gap: 0.2rem; }
.result-label { font-size: 0.78rem; color: var(--text3); font-weight: 500; }
.result-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--accent);
}
.result-value.green { color: var(--green); }
.result-value.red   { color: var(--red); }
.result-value.amber { color: var(--amber); }

.formula-box {
  background: var(--bg3);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 1rem;
  margin-top: 1rem;
}
.formula-box p {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82rem;
  color: var(--text2);
  margin: 0 0 0.4rem;
  line-height: 1.7;
}
.formula-box p:last-child { margin: 0; }
.formula-box strong { color: var(--text); }

.toggle-row {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
}
.toggle-btn {
  flex: 1;
  padding: 0.6rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text2);
  font-family: 'Sora', sans-serif;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
}
.toggle-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.error-msg { color: var(--red); font-size: 0.83rem; margin-top: 0.3rem; display: none; }
.error-msg.show { display: block; }

/* ─── Donut Chart ─── */
.donut-wrap { display: flex; align-items: center; justify-content: center; gap: 1.5rem; flex-wrap: wrap; margin-top: 1rem; }
.donut-svg { transform: rotate(-90deg); }
.donut-legend { display: flex; flex-direction: column; gap: 0.5rem; }
.donut-legend-item { display: flex; align-items: center; gap: 0.5rem; font-size: 0.82rem; }
.donut-dot { width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; }

/* ═══════════════ FOOTER ═══════════════ */
.site-footer {
  background: var(--bg2);
  border-top: 1px solid var(--border);
  padding: 3rem 1.5rem 0;
  margin-top: 4rem;
}
.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2rem;
  padding-bottom: 2rem;
}
.footer-brand .logo-icon { font-size: 1.5rem; }
.footer-brand strong { font-size: 1.2rem; }
.footer-brand p { margin-top: 0.5rem; font-size: 0.88rem; }
.footer-links { display: flex; flex-direction: column; gap: 0.5rem; }
.footer-links h4 { margin-bottom: 0.5rem; }
.footer-links a { font-size: 0.88rem; color: var(--text2); transition: color var(--transition); }
.footer-links a:hover { color: var(--accent); text-decoration: none; }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 1.2rem 0;
  text-align: center;
  max-width: 1280px;
  margin: 0 auto;
}
.footer-bottom p { font-size: 0.82rem; color: var(--text3); margin: 0; }

/* ═══════════════ RESPONSIVE ═══════════════ */
@media (max-width: 900px) {
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .hero { flex-direction: column; padding: 3rem 1.5rem 2.5rem; text-align: center; }
  .hero-visual { display: none; }
  .search-wrapper { max-width: 100%; }
}

@media (max-width: 640px) {
  .main-nav { 
    display: none;
    position: fixed;
    top: var(--header-h);
    left: 0; right: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 1rem;
    gap: 0.25rem;
    z-index: 999;
    box-shadow: var(--shadow);
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 0.75rem 1rem; }
  .hamburger { display: flex; }
  .search-shortcut { display: none; }
  .footer-inner { grid-template-columns: 1fr; }
  .modal-body { padding: 1rem 1.2rem 1.5rem; }
  .result-grid { grid-template-columns: 1fr 1fr; }
  .donut-wrap { flex-direction: column; }
}

@media (max-width: 420px) {
  .calc-grid { grid-template-columns: 1fr; }
}

/* ─── Scrollbar ─── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--bg3); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text3); }

/* ─── Selection ─── */
::selection { background: var(--accent); color: #fff; }