/* ============================================================
   CalcAnything — Stylesheet
   Font: Plus Jakarta Sans
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

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

:root {
  --bg:           #f5f8fd;
  --bg-sidebar:   #dceaf7;
  --bg-white:     #ffffff;
  --text:         #101828;
  --text-muted:   #506070;
  --border:       #c4d6ea;
  --accent:       #1a56a8;
  --accent-hover: #134490;
  --accent-light: #e8f0fb;
  --result-bg:    #e8f0fb;
  --header-bg:    #edf3ff;
  --radius:       4px;
  --sidebar-w:    224px;
  --header-h:     50px;
  --font:         'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  --mono:         'Courier New', Courier, monospace;
}

html { scroll-behavior: smooth; }
body { font-family: var(--font); font-size: 15px; line-height: 1.65; color: var(--text); background: var(--bg); }
a { color: var(--accent); }
a:hover { color: var(--accent-hover); }

/* ---- Header ---- */
.site-header { position: sticky; top: 0; z-index: 200; height: var(--header-h); background: var(--header-bg); border-bottom: 1px solid var(--border); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 100%; padding: 0 20px; max-width: 1280px; margin: 0 auto; }
.logo { font-size: 16px; font-weight: 800; color: var(--text); text-decoration: none; letter-spacing: -0.3px; white-space: nowrap; }
.logo .logo-accent { color: var(--accent); }
.header-nav { display: flex; gap: 20px; }
.header-nav a { font-size: 13.5px; color: var(--text-muted); text-decoration: none; }
.header-nav a:hover { color: var(--accent); }

/* ---- Sidebar toggle ---- */
.sidebar-toggle { display: none; align-items: center; gap: 6px; margin: 10px 16px 0; padding: 6px 12px; background: var(--bg-white); border: 1px solid var(--border); border-radius: var(--radius); font-size: 13.5px; font-family: var(--font); cursor: pointer; color: var(--text); }
.sidebar-toggle:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ---- Layout ---- */
.layout { display: flex; min-height: calc(100vh - var(--header-h)); }

/* ---- Sidebar ---- */
.sidebar { width: var(--sidebar-w); min-width: var(--sidebar-w); background: var(--bg-sidebar); border-right: 1px solid var(--border); position: sticky; top: var(--header-h); height: calc(100vh - var(--header-h)); overflow-y: auto; flex-shrink: 0; }
.sidebar-nav { padding: 16px 0 24px; }
.sidebar-heading { display: block; font-size: 10px; font-weight: 700; letter-spacing: 1px; text-transform: uppercase; color: var(--text-muted); padding: 0 16px 8px; }
.sidebar-nav ul { list-style: none; }
.sidebar-nav ul li a { display: block; padding: 7px 16px 7px 14px; border-left: 3px solid transparent; font-size: 13.5px; color: var(--text); text-decoration: none; line-height: 1.4; }
.sidebar-nav ul li a:hover { background: rgba(26,86,168,0.1); color: var(--accent); }
.sidebar-nav ul li a.active { border-left-color: var(--accent); background: rgba(26,86,168,0.1); color: var(--accent); font-weight: 600; }

/* ---- Main content ---- */
.main-content { flex: 1; min-width: 0; padding: 28px 32px 48px; max-width: 880px; }

/* ---- Tool header ---- */
.tool-header { margin-bottom: 18px; }
.tool-header h1 { font-size: 1.45rem; font-weight: 800; line-height: 1.25; margin-bottom: 4px; letter-spacing: -0.3px; }
.tool-tagline { font-size: 14px; color: var(--text-muted); }

/* ---- Tool section ---- */
.tool-section { background: var(--bg-white); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; margin-bottom: 20px; }

/* ---- Classic Calculator ---- */
.calc-wrapper { max-width: 340px; }
.calc-display-area { background: var(--result-bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 12px 14px; margin-bottom: 8px; text-align: right; min-height: 80px; display: flex; flex-direction: column; justify-content: flex-end; }
.calc-expr { font-family: var(--font); font-size: 13px; color: var(--text-muted); min-height: 18px; word-break: break-all; }
.calc-result-display { font-family: var(--font); font-size: 2.2rem; font-weight: 800; color: var(--text); word-break: break-all; }
.calc-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 5px; }
.calc-btn { padding: 15px 8px; font-size: 15px; font-family: var(--font); border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg-white); cursor: pointer; font-weight: 500; color: var(--text); line-height: 1; transition: background 0.08s; }
.calc-btn:hover { background: var(--bg); }
.calc-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
.calc-btn.op { background: var(--accent-light); color: var(--accent); font-weight: 600; }
.calc-btn.op:hover { background: var(--accent); color: white; }
.calc-btn.equals { background: var(--accent); color: white; font-weight: 700; }
.calc-btn.equals:hover { background: var(--accent-hover); }
.calc-btn.clear { background: #f0e8e8; color: #b32d2d; }
.calc-btn.clear:hover { background: #e8d0d0; }
.calc-btn.span2 { grid-column: span 2; }
.calc-btn.span3 { grid-column: span 3; }

/* ---- Scientific ---- */
.sci-wrapper { max-width: 480px; }
.sci-grid { grid-template-columns: repeat(5, 1fr); }
.calc-btn.fn { font-size: 11.5px; background: #e8f0fb; color: #1a4080; }
.calc-btn.fn:hover { background: #1a4080; color: white; }
.calc-mode-toggle { display: flex; gap: 8px; margin-bottom: 10px; }
.calc-mode-toggle button { padding: 4px 12px; font-size: 12.5px; font-family: var(--font); border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg-white); cursor: pointer; }
.calc-mode-toggle button.active { background: var(--accent); color: white; border-color: var(--accent); }

/* ---- Form-based result card ---- */
.calc-result-card { background: var(--result-bg); border: 1px solid var(--accent); border-radius: var(--radius); padding: 16px 20px; margin-bottom: 16px; }
.calc-result-main { font-size: 1.8rem; font-weight: 800; color: var(--accent); margin-bottom: 4px; line-height: 1.2; }
.calc-result-label { font-size: 13px; color: var(--text-muted); margin-bottom: 10px; }
.calc-result-rows {}
.calc-result-row { display: flex; justify-content: space-between; font-size: 14px; padding: 5px 0; border-bottom: 1px solid var(--border); }
.calc-result-row:last-child { border-bottom: none; }
.calc-result-row .label { color: var(--text-muted); }
.calc-result-row .value { font-weight: 600; }

/* ---- Investment calculator ---- */
.invest-chart-wrap { position: relative; height: 260px; margin-bottom: 16px; }
.invest-summary-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 10px; margin-bottom: 16px; }
.invest-stat { background: var(--result-bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 12px 14px; }
.invest-stat-val { font-size: 1.3rem; font-weight: 800; color: var(--accent); line-height: 1.2; margin-bottom: 2px; }
.invest-stat-label { font-size: 12px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.4px; font-weight: 600; }

/* ---- Form controls ---- */
.tool-controls { display: flex; flex-wrap: wrap; gap: 14px; align-items: flex-end; margin-bottom: 16px; }
.control-group { display: flex; flex-direction: column; gap: 5px; }
.control-group label { font-size: 12px; font-weight: 700; color: var(--text); text-transform: uppercase; letter-spacing: 0.4px; }
.control-group input[type="text"], .control-group input[type="number"], .control-group input[type="date"], .control-group select { border: 1px solid var(--border); border-radius: var(--radius); padding: 7px 10px; font-size: 14px; font-family: var(--font); color: var(--text); background: var(--bg-white); height: 34px; }
.control-group input[type="number"] { width: 110px; }
.control-group input[type="date"]   { width: 160px; }
.control-group select               { min-width: 140px; }
.control-group input:focus, .control-group select:focus { outline: 2px solid var(--accent); outline-offset: 0; border-color: var(--accent); }
.control-full { width: 100%; }
.check-group { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }
.check-label { display: flex; align-items: center; gap: 6px; font-size: 13.5px; cursor: pointer; user-select: none; }
.check-label input[type="checkbox"] { width: 15px; height: 15px; accent-color: var(--accent); cursor: pointer; flex-shrink: 0; }

/* ---- Buttons ---- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 5px; padding: 8px 18px; border: 1px solid transparent; border-radius: var(--radius); font-size: 14px; font-weight: 600; font-family: var(--font); cursor: pointer; line-height: 1; white-space: nowrap; transition: background 0.1s, color 0.1s, border-color 0.1s; }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.btn-primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn-secondary { background: var(--bg-white); color: var(--text); border-color: var(--border); }
.btn-secondary:hover { background: var(--bg); }
.btn-sm { padding: 5px 12px; font-size: 13px; }
.btn-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }

/* ---- Range slider ---- */
input[type="range"] { accent-color: var(--accent); cursor: pointer; width: 100%; }

/* ---- Unit converter tabs ---- */
.unit-tabs { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 16px; }
.unit-tab { padding: 5px 12px; font-size: 13px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg-white); cursor: pointer; font-family: var(--font); }
.unit-tab.active { background: var(--accent); color: white; border-color: var(--accent); }
.unit-tab:hover:not(.active) { background: var(--bg); }

/* ---- Sub-tab patterns (discount, date, percentage) ---- */
.perc-tabs, .disc-tabs, .dc-tabs { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 16px; }
.perc-tab, .disc-tab, .dc-tab { padding: 6px 14px; font-size: 13px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg-white); cursor: pointer; font-family: var(--font); font-weight: 500; }
.perc-tab.active, .disc-tab.active, .dc-tab.active { background: var(--accent); color: white; border-color: var(--accent); }
.perc-tab:hover:not(.active), .disc-tab:hover:not(.active), .dc-tab:hover:not(.active) { background: var(--bg); }
.perc-panel, .disc-panel, .dc-panel { display: none; }
.perc-panel.active, .disc-panel.active, .dc-panel.active { display: block; }

/* ---- Ad slots ---- */
.ad-slot { display: flex; align-items: center; justify-content: center; min-height: 90px; border: 1px dashed var(--border); background: #f5f8fd; border-radius: var(--radius); margin-bottom: 20px; }
.ad-label { font-size: 11px; text-transform: uppercase; letter-spacing: 0.8px; color: #a8b8c8; }

/* ---- Content blocks ---- */
.content-sections { border-top: 1px solid var(--border); }
.content-block { padding: 20px 0; border-bottom: 1px solid var(--border); }
.content-block:last-child { border-bottom: none; }
.content-block h2 { font-size: 1.05rem; font-weight: 700; margin-bottom: 10px; }
.content-block p { margin-bottom: 10px; }
.content-block p:last-child { margin-bottom: 0; }
.content-block ul, .content-block ol { padding-left: 20px; }
.content-block ul li, .content-block ol li { margin-bottom: 5px; }
.faq-section dt { font-weight: 600; margin-top: 14px; margin-bottom: 3px; }
.faq-section dt:first-child { margin-top: 0; }
.faq-section dd { color: var(--text-muted); margin-left: 0; }

/* ---- Hub grid ---- */
.hub-intro { margin-bottom: 24px; }
.hub-intro h1 { font-size: 1.5rem; font-weight: 800; margin-bottom: 6px; letter-spacing: -0.3px; }
.hub-intro p { color: var(--text-muted); max-width: 560px; }
.tools-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(185px, 1fr)); gap: 12px; margin-bottom: 24px; }
.tool-card { display: block; background: var(--bg-white); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 16px; text-decoration: none; color: var(--text); transition: border-color 0.1s, background 0.1s; }
.tool-card:hover { border-color: var(--accent); background: var(--accent-light); color: var(--text); }
.tool-card-name { font-size: 14px; font-weight: 700; margin-bottom: 4px; }
.tool-card-desc { font-size: 12.5px; color: var(--text-muted); line-height: 1.5; }

/* ---- Static pages ---- */
.static-page { max-width: 680px; }
.static-page h1 { font-size: 1.5rem; font-weight: 800; margin-bottom: 16px; letter-spacing: -0.3px; }
.static-page h2 { font-size: 1.05rem; font-weight: 700; margin: 20px 0 8px; }
.static-page p { margin-bottom: 12px; }
.static-page ul { padding-left: 20px; margin-bottom: 12px; }
.static-page ul li { margin-bottom: 5px; }
.contact-form .control-group { margin-bottom: 14px; }
.contact-form input, .contact-form textarea { width: 100%; border: 1px solid var(--border); border-radius: var(--radius); padding: 8px 10px; font-size: 14px; font-family: var(--font); color: var(--text); background: var(--bg-white); }
.contact-form textarea { min-height: 120px; resize: vertical; }
.contact-form input:focus, .contact-form textarea:focus { outline: 2px solid var(--accent); border-color: var(--accent); }
.form-note { font-size: 13px; color: var(--text-muted); margin-top: 8px; }

/* ---- Footer ---- */
.site-footer { border-top: 1px solid var(--border); background: var(--bg-white); padding: 20px 32px; }
.footer-inner { max-width: 1280px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 10px; }
.footer-copy { font-size: 13px; color: var(--text-muted); }
.footer-nav a { font-size: 13px; color: var(--text-muted); text-decoration: none; margin-left: 16px; }
.footer-nav a:first-child { margin-left: 0; }
.footer-nav a:hover { color: var(--accent); }

/* ---- Responsive ---- */
@media (max-width: 800px) {
  .sidebar { position: fixed; top: var(--header-h); left: 0; z-index: 150; height: calc(100vh - var(--header-h)); transform: translateX(-100%); transition: transform 0.2s ease; box-shadow: 2px 0 8px rgba(0,0,0,0.08); }
  .sidebar.open { transform: translateX(0); }
  .sidebar-toggle { display: flex; }
  .main-content { padding: 16px 16px 40px; }
  .header-nav { display: none; }
  .calc-result-display { font-size: 1.7rem; }
  .tools-grid { grid-template-columns: repeat(auto-fill, minmax(155px, 1fr)); }
  .footer-inner { flex-direction: column; align-items: flex-start; }
  .sci-grid { grid-template-columns: repeat(4, 1fr); }
  .invest-summary-grid { grid-template-columns: repeat(2, 1fr); }
}