/* ============================================
   CPMCalculator.info — Main Stylesheet
   style.css
   ============================================ */

/* CSS VARIABLES */
:root {
  --accent: #00e676;
  --accent2: #1de9b6;
  --bg: #0a0f0d;
  --bg2: #0f1a14;
  --surface: #111e16;
  --surface2: #1a2e20;
  --text: #e8f5e9;
  --text2: #a5d6a7;
  --muted: #4a7c59;
  --border: rgba(0,230,118,0.15);
  --radius: 12px;
  --font-head: 'Syne', sans-serif;
  --font-body: 'DM Sans', sans-serif;
}
[data-theme="light"] {
  --bg: #f0faf3;
  --bg2: #e8f5ec;
  --surface: #ffffff;
  --surface2: #e0f2e9;
  --text: #0d2b15;
  --text2: #1b5e2f;
  --muted: #5a9e6f;
  --border: rgba(0,150,80,0.18);
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.6;
  min-height: 100vh;
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  padding: 64px clamp(16px,4vw,48px) 0;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content:'';
  position:absolute; top:-80px; right:-80px;
  width:500px; height:500px;
  background: radial-gradient(circle, rgba(0,230,118,0.06) 0%, transparent 70%);
  pointer-events:none;
}
.hero-inner {
  max-width:1200px; margin:0 auto;
  display:grid; grid-template-columns:1fr 1fr;
  gap:48px; align-items:start;
}
.hero-text { padding-bottom:64px; }
.hero-badge {
  display:inline-flex; align-items:center; gap:6px;
  background:rgba(0,230,118,0.1); border:1px solid rgba(0,230,118,0.2);
  padding:5px 12px; border-radius:99px;
  font-size:0.78rem; color:var(--accent);
  font-family:var(--font-body); margin-bottom:20px;
  letter-spacing:0.04em; text-transform:uppercase;
}
.hero h1 {
  font-family:var(--font-head); font-size:clamp(2rem,4vw,3rem);
  font-weight:800; line-height:1.15;
  color:var(--text); margin-bottom:16px;
  letter-spacing:-0.03em;
}
.hero h1 .highlight { color:var(--accent); }
.hero .sub {
  color:var(--text2); font-size:1.05rem;
  line-height:1.7; max-width:480px;
}

/* ============================================
   CALCULATOR CARD
   ============================================ */
.calc-card {
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:20px;
  padding:32px;
  box-shadow:0 24px 80px rgba(0,0,0,0.4);
  position:relative;
}
.calc-card::before {
  content:'';
  position:absolute; inset:0;
  border-radius:20px;
  background:linear-gradient(135deg, rgba(0,230,118,0.04), transparent);
  pointer-events:none;
}
.calc-tabs {
  display:flex; gap:4px;
  background:var(--surface2); border-radius:10px;
  padding:4px; margin-bottom:24px;
  overflow-x:auto;
}
.calc-tab {
  flex:1; padding:8px 12px; border-radius:7px;
  border:none; cursor:pointer; font-size:0.78rem;
  font-family:var(--font-body); font-weight:500;
  color:var(--text2); background:transparent;
  transition:all 0.2s; white-space:nowrap;
}
.calc-tab.active {
  background:var(--surface); color:var(--accent);
  box-shadow:0 2px 8px rgba(0,0,0,0.3);
}

/* Tool panels */
.tool-panel { display:none; }
.tool-panel.active { display:block; }

.input-group { margin-bottom:16px; }
.input-group label {
  display:block; font-size:0.82rem;
  color:var(--text2); margin-bottom:6px;
  font-weight:500;
}
.input-wrap {
  position:relative; display:flex; align-items:center;
}
.input-wrap .prefix {
  position:absolute; left:14px;
  color:var(--muted); font-size:0.9rem; pointer-events:none;
  font-weight:600;
}
.input-wrap input {
  width:100%; padding:12px 14px 12px 32px;
  background:var(--surface2); border:1px solid var(--border);
  border-radius:var(--radius); color:var(--text);
  font-size:0.95rem; font-family:var(--font-body);
  outline:none; transition:border-color 0.2s;
}
.input-wrap input:focus { border-color:var(--accent); }
.input-wrap input.no-prefix { padding-left:14px; }

.calc-btn {
  width:100%; padding:14px;
  background:linear-gradient(135deg, var(--accent), var(--accent2));
  color:#0a0f0d; border:none; border-radius:var(--radius);
  font-size:0.95rem; font-weight:700;
  font-family:var(--font-head); cursor:pointer;
  transition:opacity 0.2s, transform 0.1s;
  letter-spacing:0.02em; margin-top:8px;
}
.calc-btn:hover { opacity:0.9; }
.calc-btn:active { transform:scale(0.98); }

.result-box {
  margin-top:16px; padding:16px 20px;
  background:var(--bg2); border:1px solid var(--border);
  border-radius:var(--radius); display:none;
}
.result-box.show { display:block; }
.result-label { font-size:0.78rem; color:var(--text2); margin-bottom:4px; }
.result-value {
  font-family:var(--font-head); font-size:2rem;
  font-weight:800; color:var(--accent);
}
.result-sub { font-size:0.8rem; color:var(--muted); margin-top:4px; }

/* ============================================
   MAIN CONTENT
   ============================================ */
.main-content {
  max-width:1200px; margin:0 auto;
  padding:64px clamp(16px,4vw,48px);
}

/* AdSense placeholder */
.adsense-slot {
  background:var(--surface2); border:1px dashed var(--border);
  border-radius:var(--radius); padding:16px;
  text-align:center; color:var(--muted);
  font-size:0.78rem; margin:32px 0;
}

/* CONTENT SECTIONS */
.content-section { margin-bottom:56px; }
.content-section h2 {
  font-family:var(--font-head); font-size:1.6rem;
  font-weight:700; color:var(--text);
  margin-bottom:16px; letter-spacing:-0.02em;
}
.content-section h3 {
  font-family:var(--font-head); font-size:1.15rem;
  font-weight:600; color:var(--text2);
  margin:24px 0 10px;
}
.content-section p {
  color:var(--text2); line-height:1.8;
  margin-bottom:14px; font-size:0.96rem;
}

/* Formula box */
.formula-box {
  background:var(--surface); border:1px solid var(--border);
  border-radius:var(--radius); padding:24px 28px;
  margin:20px 0; text-align:center;
}
.formula-box .formula {
  font-family:var(--font-head); font-size:1.3rem;
  color:var(--accent); font-weight:700;
}
.formula-box .formula-note {
  font-size:0.82rem; color:var(--muted); margin-top:8px;
}

/* Key terms grid */
.terms-grid {
  display:grid; grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
  gap:16px; margin:20px 0;
}
.term-card {
  background:var(--surface); border:1px solid var(--border);
  border-radius:var(--radius); padding:20px;
  transition:border-color 0.2s;
}
.term-card:hover { border-color:var(--accent); }
.term-card .term-name {
  font-family:var(--font-head); font-size:0.85rem;
  color:var(--accent); font-weight:700;
  text-transform:uppercase; letter-spacing:0.05em;
  margin-bottom:6px;
}
.term-card p { font-size:0.86rem; color:var(--text2); margin:0; }

/* Tools Grid (cards) */
.tools-grid {
  display:grid; grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
  gap:16px; margin:20px 0;
}
.tool-card {
  background:var(--surface); border:1px solid var(--border);
  border-radius:var(--radius); padding:22px;
  text-decoration:none; transition:all 0.2s;
  display:block;
}
.tool-card:hover {
  border-color:var(--accent);
  transform:translateY(-3px);
  box-shadow:0 8px 30px rgba(0,230,118,0.1);
}
.tool-card .tool-icon { font-size:1.8rem; margin-bottom:10px; }
.tool-card .tool-name {
  font-family:var(--font-head); font-size:1rem;
  font-weight:700; color:var(--text); margin-bottom:6px;
}
.tool-card .tool-desc { font-size:0.82rem; color:var(--muted); line-height:1.5; }

/* Benchmarks table */
.bench-table {
  width:100%; border-collapse:collapse; margin:16px 0;
  font-size:0.88rem;
}
.bench-table th, .bench-table td {
  padding:12px 16px; text-align:left;
  border-bottom:1px solid var(--border);
}
.bench-table th {
  font-family:var(--font-head); font-size:0.78rem;
  text-transform:uppercase; letter-spacing:0.06em;
  color:var(--accent); background:var(--surface);
}
.bench-table tr:hover td { background:rgba(0,230,118,0.04); }
.bench-table td { color:var(--text2); }

/* FAQ Accordion */
.faq-list { margin:16px 0; }
.faq-item {
  border:1px solid var(--border); border-radius:var(--radius);
  margin-bottom:10px; overflow:hidden;
}
.faq-question {
  width:100%; background:var(--surface); border:none;
  padding:18px 20px; text-align:left;
  display:flex; align-items:center; justify-content:space-between;
  cursor:pointer; gap:16px;
  font-family:var(--font-body); font-size:0.95rem;
  color:var(--text); font-weight:500;
  transition:background 0.2s;
}
.faq-question:hover { background:var(--surface2); }
.faq-question .faq-icon {
  flex-shrink:0; width:22px; height:22px;
  border-radius:50%; background:var(--surface2);
  border:1px solid var(--border);
  display:flex; align-items:center; justify-content:center;
  font-size:14px; color:var(--accent);
  transition:transform 0.3s;
}
.faq-item.open .faq-icon { transform:rotate(45deg); }
.faq-answer {
  max-height:0; overflow:hidden;
  transition:max-height 0.4s ease;
  background:var(--bg2);
}
.faq-answer-inner {
  padding:16px 20px; color:var(--text2);
  font-size:0.9rem; line-height:1.75;
}
.faq-answer-inner a { color:var(--accent); text-decoration:none; }
.faq-answer-inner a:hover { text-decoration:underline; }

/* Tool Detail List (numbered cards) */
.tool-detail-list { margin-top:20px; display:flex; flex-direction:column; gap:20px; }
.tool-detail-item {
  background:var(--surface); border:1px solid var(--border);
  border-radius:var(--radius); padding:22px 24px;
  transition:border-color 0.2s;
}
.tool-detail-item:hover { border-color:rgba(0,230,118,0.35); }
.tool-detail-header {
  display:flex; align-items:flex-start; gap:14px; margin-bottom:12px;
}
.tool-detail-num {
  flex-shrink:0; width:30px; height:30px; border-radius:8px;
  background:linear-gradient(135deg, var(--accent), var(--accent2));
  color:#0a0f0d; font-family:var(--font-head); font-size:0.85rem;
  font-weight:800; display:flex; align-items:center; justify-content:center;
}
.tool-detail-title {
  font-family:var(--font-head); font-size:1.05rem;
  font-weight:700; color:var(--text); margin:0;
}
.tool-detail-title a { color:var(--text); text-decoration:none; transition:color 0.2s; }
.tool-detail-title a:hover { color:var(--accent); }
.tool-detail-item p { color:var(--text2); font-size:0.92rem; line-height:1.8; }
.tool-detail-item p a { color:var(--accent); text-decoration:none; }
.tool-detail-item p a:hover { text-decoration:underline; }

/* ============================================
   RESPONSIVE
   ============================================ */
@media(max-width:900px) {
  .hero-inner { grid-template-columns:1fr; }
  .hero-text { padding-bottom:0; }
  .hero { padding-bottom:48px; }
}
@media(max-width:520px) {
  .calc-tab { font-size:0.7rem; padding:7px 8px; }
}