/* ==========================================================================
   CalcRef.com - Cyber-Slate & Amber Master Design System
   ========================================================================== */

:root {
  --bg-dark: #090a0f;
  --bg-surface: #12141c;
  --bg-surface-elevated: #1a1d29;
  --glass-bg: rgba(18, 20, 28, 0.85);
  --glass-border: rgba(245, 158, 11, 0.2);

  --accent-amber: #f59e0b;
  --accent-amber-hover: #d97706;
  --accent-cyan: #06b6d4;
  --accent-rose: #f43f5e;

  --text-main: #f8fafc;
  --text-muted: #cbd5e1;
  --text-dim: #94a3b8;

  --font-primary: 'Inter', system-ui, -apple-system, sans-serif;
  --font-heading: 'Outfit', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 18px;
  --radius-full: 9999px;

  --shadow-sm: 0 4px 6px rgba(0,0,0,0.4);
  --shadow-md: 0 12px 30px rgba(0,0,0,0.6);
  --shadow-amber: 0 0 25px rgba(245, 158, 11, 0.25);

  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-image: 
    radial-gradient(circle at 10% 10%, rgba(245, 158, 11, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 90% 90%, rgba(6, 182, 212, 0.06) 0%, transparent 40%);
  background-attachment: fixed;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--text-main);
}

.text-amber { color: var(--accent-amber); }

/* Header */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(9, 10, 15, 0.9);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--glass-border);
  padding: 0.85rem 1.5rem;
}

.header-container {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.brand-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--accent-amber), var(--accent-amber-hover));
  color: var(--bg-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  box-shadow: var(--shadow-amber);
}

.brand-title {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 800;
  color: white;
}

.brand-subtitle {
  font-size: 0.72rem;
  color: var(--accent-amber);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
}

.nav-links {
  display: flex;
  gap: 0.4rem;
  background: rgba(0, 0, 0, 0.4);
  padding: 0.3rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--glass-border);
}

.nav-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 0.88rem;
  font-weight: 500;
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: all var(--transition);
}

.nav-btn:hover { color: white; background: rgba(255, 255, 255, 0.05); }

.nav-btn.active {
  background: var(--accent-amber);
  color: var(--bg-dark);
  font-weight: 700;
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.35);
}

.btn-pro-pass {
  background: linear-gradient(135deg, var(--accent-amber), #d97706);
  color: var(--bg-dark);
  border: none;
  border-radius: var(--radius-full);
  padding: 0.6rem 1.25rem;
  font-size: 0.88rem;
  font-weight: 800;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all var(--transition);
}

.btn-pro-pass:hover { transform: translateY(-1px); box-shadow: 0 6px 18px rgba(245, 158, 11, 0.4); }

/* Hero */
.hero-section {
  padding: 3rem 1.5rem 2rem;
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(245, 158, 11, 0.12);
  border: 1px solid rgba(245, 158, 11, 0.3);
  color: var(--accent-amber);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.35rem 1rem;
  border-radius: var(--radius-full);
  margin-bottom: 1rem;
}

.hero-title {
  font-size: 2.6rem;
  line-height: 1.2;
  letter-spacing: -0.03em;
  margin-bottom: 0.85rem;
  background: linear-gradient(135deg, #ffffff 40%, #fde68a 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 720px;
  margin: 0 auto 1.75rem;
}

.search-bar-wrapper {
  position: relative;
  max-width: 640px;
  margin: 0 auto;
}

.search-icon {
  position: absolute;
  left: 1.25rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--accent-amber);
  font-size: 1.1rem;
}

.search-bar-wrapper input {
  width: 100%;
  background: var(--bg-surface);
  border: 1px solid var(--accent-amber);
  border-radius: var(--radius-full);
  padding: 1rem 1.25rem 1rem 3rem;
  color: white;
  font-family: var(--font-primary);
  font-size: 1rem;
  box-shadow: var(--shadow-md);
}

/* Main Container */
.main-container {
  max-width: 1280px;
  margin: 0 auto;
  width: 100%;
  padding: 1.5rem;
  flex: 1;
}

.calc-workspace-card {
  background: var(--bg-surface);
  border: 1px solid var(--accent-amber);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-bottom: 3rem;
  box-shadow: var(--shadow-md);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1.75rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.tool-meta h2 { font-size: 1.5rem; margin-bottom: 0.35rem; }
.tool-meta p { font-size: 0.95rem; color: var(--text-muted); }

.suite-tag {
  font-size: 0.8rem;
  color: var(--accent-amber);
  background: rgba(245, 158, 11, 0.15);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  border: 1px solid rgba(245, 158, 11, 0.3);
  font-weight: 600;
}

.calc-body-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.form-group {
  margin-bottom: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-group label { font-size: 0.88rem; font-weight: 600; }

.form-group input, .form-group select {
  width: 100%;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  color: white;
  font-family: var(--font-primary);
  font-size: 0.95rem;
}

.btn-compute {
  width: 100%;
  background: linear-gradient(135deg, var(--accent-amber), var(--accent-amber-hover));
  color: var(--bg-dark);
  border: none;
  border-radius: var(--radius-sm);
  padding: 0.95rem;
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 800;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 1rem;
}

/* Output Panel */
.hero-output-box {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.15), rgba(0,0,0,0.4));
  border: 1px solid var(--accent-amber);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  text-align: center;
  margin-bottom: 1.5rem;
}

.output-label { font-size: 0.85rem; color: var(--accent-amber); text-transform: uppercase; letter-spacing: 0.05em; font-weight: 700; display: block; margin-bottom: 0.25rem; }
.output-value { font-family: var(--font-mono); font-size: 2.2rem; font-weight: 800; color: white; display: block; }
.output-note { font-size: 0.82rem; color: var(--text-muted); margin-top: 0.35rem; display: block; }

.breakdown-box {
  background: var(--bg-surface-elevated);
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-bottom: 1.5rem;
}

.breakdown-box h4 { font-size: 0.95rem; margin-bottom: 0.85rem; }

.breakdown-row {
  display: flex;
  justify-content: space-between;
  padding: 0.5rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.05);
  font-size: 0.9rem;
}

.breakdown-row strong { font-family: var(--font-mono); color: var(--accent-amber); }

.btn-export {
  width: 100%;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--glass-border);
  color: white;
  padding: 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

/* Articles */
.adsense-articles-section { margin-bottom: 3rem; }
.section-title { font-size: 1.6rem; margin-bottom: 1.5rem; text-align: center; }

.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.article-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
}

.article-card h3 { font-size: 1.1rem; margin-bottom: 0.75rem; }
.article-card p { font-size: 0.9rem; color: var(--text-muted); line-height: 1.6; }

/* Modals */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(9, 10, 15, 0.85);
  backdrop-filter: blur(8px);
  z-index: 1000;
  display: flex; align-items: center; justify-content: center;
  padding: 1.5rem;
}

.modal-card {
  background: var(--bg-surface);
  border: 1px solid var(--accent-amber);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  max-width: 520px; width: 100%;
  position: relative;
  box-shadow: var(--shadow-md);
}

.modal-close {
  position: absolute; top: 1.25rem; right: 1.25rem;
  background: transparent; border: none; color: var(--text-muted);
  font-size: 1.2rem; cursor: pointer;
}

.modal-header { text-align: center; margin-bottom: 1.5rem; }
.modal-icon { font-size: 2.5rem; margin-bottom: 0.5rem; }

.btn-submit-pro {
  width: 100%;
  background: linear-gradient(135deg, var(--accent-amber), var(--accent-amber-hover));
  color: var(--bg-dark);
  border: none; border-radius: var(--radius-sm);
  padding: 0.95rem; font-family: var(--font-heading); font-size: 1.05rem; font-weight: 800;
  cursor: pointer; display: flex; align-items: center; justify-content: center; gap: 0.5rem;
  margin-top: 1rem;
}

.modal-privacy { font-size: 0.78rem; color: var(--text-muted); text-align: center; margin-top: 0.75rem; }

/* Footer */
.app-footer {
  background: #040508;
  border-top: 1px solid var(--glass-border);
  padding: 2rem 1.5rem;
  margin-top: auto;
}

.footer-container { max-width: 1280px; margin: 0 auto; }
.footer-disclaimer { font-size: 0.78rem; color: var(--text-dim); margin-bottom: 1.5rem; }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; font-size: 0.85rem; color: var(--text-muted); border-top: 1px solid rgba(255,255,255,0.05); padding-top: 1rem; }
.footer-links a { color: var(--text-muted); text-decoration: none; }
.footer-links a:hover { color: var(--accent-amber); }

.toast {
  position: fixed; bottom: 2rem; right: 2rem;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--accent-amber);
  color: white; padding: 0.85rem 1.25rem;
  border-radius: var(--radius-md); box-shadow: var(--shadow-md);
  display: flex; align-items: center; gap: 0.6rem; z-index: 2000;
}

.hidden { display: none !important; }

@media (max-width: 768px) {
  .header-container { flex-direction: column; align-items: flex-start; }
  .nav-links { width: 100%; overflow-x: auto; }
  .calc-body-grid { grid-template-columns: 1fr; }
}