/* =========================================
   SOLAR PANEL COST CALCULATOR — style.css
   Theme: Modern Solar / Utility Premium
   ========================================= */

:root {
  --sun: #F5A623;
  --sun-bright: #FFD000;
  --solar-dark: #0B1220;
  --solar-mid: #111C2E;
  --solar-panel: #0F2040;
  --green: #22C55E;
  --green-dim: #16A34A;
  --sky: #38BDF8;
  --text: #E8EFF8;
  --text-muted: #8B9DC3;
  --card-bg: #131F35;
  --card-border: rgba(255,255,255,0.07);
  --radius: 14px;
  --radius-sm: 8px;
  --shadow: 0 4px 32px rgba(0,0,0,0.4);
  --font-display: 'Syne', sans-serif;
  --font-body: 'DM Sans', sans-serif;
  --transition: 0.25s cubic-bezier(0.4,0,0.2,1);
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-body);
  background: var(--solar-dark);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---- HEADER ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11,18,32,0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--card-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  padding-bottom: 14px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.5px;
}
.logo-icon {
  font-size: 1.4rem;
  filter: drop-shadow(0 0 8px var(--sun));
  animation: pulse-sun 3s ease-in-out infinite;
}
@keyframes pulse-sun {
  0%,100% { filter: drop-shadow(0 0 8px var(--sun)); }
  50% { filter: drop-shadow(0 0 16px var(--sun-bright)); }
}
.logo-text { color: var(--text); }

.main-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}
.main-nav a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition);
}
.main-nav a:hover { color: var(--text); }
.main-nav .nav-cta {
  background: var(--sun);
  color: #000;
  padding: 8px 20px;
  border-radius: 50px;
  font-weight: 600;
  transition: background var(--transition), transform var(--transition);
}
.main-nav .nav-cta:hover { background: var(--sun-bright); transform: translateY(-1px); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}

.mobile-nav {
  display: none;
  flex-direction: column;
  gap: 0;
  padding: 8px 24px 16px;
  border-top: 1px solid var(--card-border);
}
.mobile-nav a {
  padding: 10px 0;
  font-weight: 500;
  color: var(--text-muted);
  border-bottom: 1px solid var(--card-border);
}
.mobile-nav .nav-cta {
  margin-top: 12px;
  background: var(--sun);
  color: #000;
  text-align: center;
  padding: 12px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  border: none;
}
.mobile-nav.open { display: flex; }

/* ---- HERO ---- */
.hero {
  position: relative;
  overflow: hidden;
  padding: 100px 0 80px;
  min-height: 580px;
  display: flex;
  align-items: center;
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.sun-circle {
  position: absolute;
  top: -120px;
  right: -80px;
  width: 480px;
  height: 480px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(245,166,35,0.18) 0%, rgba(245,166,35,0.04) 60%, transparent 80%);
  animation: sun-rotate 20s linear infinite;
}
@keyframes sun-rotate {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.ray {
  position: absolute;
  top: -60px;
  right: 150px;
  width: 2px;
  height: 600px;
  background: linear-gradient(to bottom, rgba(255,208,0,0.12), transparent);
  transform-origin: top center;
}
.ray-1 { transform: rotate(15deg); animation: ray-pulse 4s ease-in-out infinite; }
.ray-2 { transform: rotate(35deg); animation: ray-pulse 4s ease-in-out 0.8s infinite; }
.ray-3 { transform: rotate(55deg); animation: ray-pulse 4s ease-in-out 1.6s infinite; }
.ray-4 { transform: rotate(75deg); animation: ray-pulse 4s ease-in-out 2.4s infinite; }

@keyframes ray-pulse {
  0%,100% { opacity: 0.4; }
  50% { opacity: 1; }
}

.grid-lines {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(56,189,248,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(56,189,248,0.04) 1px, transparent 1px);
  background-size: 60px 60px;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 680px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(245,166,35,0.12);
  border: 1px solid rgba(245,166,35,0.25);
  color: var(--sun);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 50px;
  margin-bottom: 20px;
  letter-spacing: 0.5px;
  animation: fade-up 0.6s ease both;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.4rem);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -1.5px;
  color: #fff;
  margin-bottom: 20px;
  animation: fade-up 0.6s ease 0.1s both;
}
.hero-title em {
  font-style: normal;
  color: var(--sun);
  position: relative;
}

.hero-sub {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 520px;
  margin-bottom: 32px;
  animation: fade-up 0.6s ease 0.2s both;
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-bottom: 36px;
  animation: fade-up 0.6s ease 0.3s both;
}
.stat { text-align: center; }
.stat strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--sun);
}
.stat span { font-size: 0.78rem; color: var(--text-muted); }
.stat-divider { width: 1px; height: 40px; background: var(--card-border); }

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

/* ---- BUTTONS ---- */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--sun), #FF8C00);
  color: #000;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  padding: 14px 32px;
  border-radius: 50px;
  border: none;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 8px 32px rgba(245,166,35,0.35);
  animation: fade-up 0.6s ease 0.4s both;
  text-decoration: none;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(245,166,35,0.5);
}

/* ---- SECTION LABELS ---- */
.section-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--sun);
  margin-bottom: 12px;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.8px;
  color: #fff;
  margin-bottom: 12px;
}

.section-sub {
  color: var(--text-muted);
  font-size: 1rem;
  max-width: 540px;
  margin-bottom: 48px;
}

/* ---- CALCULATOR SECTION ---- */
.calculator-section {
  padding: 80px 0;
  background: var(--solar-mid);
}

.calc-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: start;
}

.calc-form {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 36px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.3px;
}

.form-group input,
.form-group select {
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1rem;
  padding: 12px 14px;
  transition: border-color var(--transition), box-shadow var(--transition);
  -webkit-appearance: none;
}
.form-group input::placeholder { color: rgba(139,157,195,0.5); }
.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--sun);
  box-shadow: 0 0 0 3px rgba(245,166,35,0.12);
}
.form-group select option { background: var(--solar-dark); }

.form-hint {
  font-size: 0.75rem;
  color: rgba(139,157,195,0.6);
}

.btn-calculate {
  width: 100%;
  background: linear-gradient(135deg, var(--sun), #FF8C00);
  color: #000;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  padding: 14px 24px;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 4px 20px rgba(245,166,35,0.3);
  margin-top: 4px;
}
.btn-calculate:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(245,166,35,0.45);
}

.btn-reset {
  width: 100%;
  background: transparent;
  border: 1px solid var(--card-border);
  color: var(--text-muted);
  font-family: var(--font-body);
  font-size: 0.85rem;
  padding: 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition);
}
.btn-reset:hover { border-color: var(--text-muted); color: var(--text); }

/* ---- RESULTS PANEL ---- */
.calc-results {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  min-height: 400px;
  display: flex;
  flex-direction: column;
}

.results-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1;
  padding: 60px 32px;
  text-align: center;
  color: var(--text-muted);
}
.placeholder-icon { font-size: 3.5rem; margin-bottom: 16px; opacity: 0.5; }
.results-placeholder p { font-size: 0.95rem; max-width: 220px; }
.results-placeholder strong { color: var(--sun); }

.results-data { padding: 32px; }

.results-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}
.results-header h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
}
.results-tag {
  background: rgba(34,197,94,0.12);
  border: 1px solid rgba(34,197,94,0.25);
  color: var(--green);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 50px;
  letter-spacing: 0.5px;
}

.result-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 20px;
}

.result-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  padding: 16px;
}
.result-card.accent { border-color: rgba(245,166,35,0.3); background: rgba(245,166,35,0.06); }
.result-card.green { border-color: rgba(34,197,94,0.3); background: rgba(34,197,94,0.06); }

.rc-label { font-size: 0.72rem; color: var(--text-muted); font-weight: 600; letter-spacing: 0.3px; margin-bottom: 6px; text-transform: uppercase; }
.rc-value {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 800;
  color: #fff;
}
.result-card.accent .rc-value { color: var(--sun); }
.result-card.green .rc-value { color: var(--green); }
.rc-unit { font-size: 0.72rem; color: var(--text-muted); margin-top: 2px; }

.results-breakdown {
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  padding: 16px;
  margin-top: 8px;
}
.breakdown-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px 0;
  font-size: 0.85rem;
  border-bottom: 1px solid var(--card-border);
}
.breakdown-row:last-child { border-bottom: none; }
.breakdown-row .br-label { color: var(--text-muted); }
.breakdown-row .br-value { font-weight: 600; color: var(--text); }
.breakdown-row .br-value.positive { color: var(--green); }

.results-disclaimer {
  margin-top: 14px;
  font-size: 0.72rem;
  color: rgba(139,157,195,0.5);
  line-height: 1.5;
}

/* ---- FEATURES ---- */
.features-section {
  padding: 80px 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color var(--transition), transform var(--transition);
}
.feature-card:hover {
  border-color: rgba(245,166,35,0.3);
  transform: translateY(-4px);
}

.feat-icon {
  font-size: 1.8rem;
  margin-bottom: 14px;
  display: block;
}

.feature-card h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
}
.feature-card p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ---- CTA BAND ---- */
.cta-band {
  padding: 60px 0;
  background: linear-gradient(135deg, rgba(245,166,35,0.12), rgba(255,140,0,0.06));
  border-top: 1px solid rgba(245,166,35,0.15);
  border-bottom: 1px solid rgba(245,166,35,0.15);
}
.cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}
.cta-text h2 {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 6px;
}
.cta-text p { color: var(--text-muted); }
.cta-band .btn-primary { animation: none; white-space: nowrap; }

/* ---- BLOG SECTION ---- */
.blog-section {
  padding: 80px 0;
  background: var(--solar-mid);
}

.blog-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 20px;
}

.blog-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: border-color var(--transition), transform var(--transition);
}
.blog-card:hover {
  border-color: rgba(56,189,248,0.3);
  transform: translateY(-3px);
}
.blog-card.featured {
  grid-row: 1 / 3;
  background: linear-gradient(145deg, var(--card-bg), rgba(245,166,35,0.04));
  border-color: rgba(245,166,35,0.2);
  padding: 36px;
}

.blog-tag {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--sky);
  background: rgba(56,189,248,0.1);
  border: 1px solid rgba(56,189,248,0.2);
  padding: 3px 10px;
  border-radius: 50px;
  width: fit-content;
}
.blog-card.featured .blog-tag { color: var(--sun); background: rgba(245,166,35,0.1); border-color: rgba(245,166,35,0.2); }

.blog-card h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.3;
  color: #fff;
}
.blog-card.featured h3 { font-size: 1.35rem; }
.blog-card h3 a { transition: color var(--transition); }
.blog-card h3 a:hover { color: var(--sun); }

.blog-card p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
  flex: 1;
}

.blog-meta {
  display: flex;
  gap: 16px;
  font-size: 0.75rem;
  color: rgba(139,157,195,0.6);
}

.blog-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--sun);
  transition: gap var(--transition);
  margin-top: 4px;
}
.blog-link:hover { gap: 8px; }

/* ---- FOOTER ---- */
.site-footer {
  background: var(--solar-panel);
  border-top: 1px solid var(--card-border);
  padding: 60px 0 0;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 64px;
  padding-bottom: 48px;
}

.footer-brand p {
  margin-top: 12px;
  font-size: 0.88rem;
  color: var(--text-muted);
  max-width: 280px;
  line-height: 1.6;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-col h4 {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 4px;
}
.footer-col a {
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: color var(--transition);
}
.footer-col a:hover { color: var(--text); }

.footer-bottom {
  border-top: 1px solid var(--card-border);
  padding: 20px 0;
}
.footer-bottom .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}
.footer-bottom p { font-size: 0.78rem; color: rgba(139,157,195,0.5); }

/* =========================================
   BLOG POST PAGES
   ========================================= */
.blog-post-hero {
  padding: 60px 0 40px;
  background: var(--solar-mid);
  border-bottom: 1px solid var(--card-border);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 28px;
  transition: color var(--transition);
}
.back-link:hover { color: var(--text); }

.post-category {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--sun);
  margin-bottom: 14px;
}

.post-title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -1px;
  color: #fff;
  line-height: 1.15;
  margin-bottom: 16px;
  max-width: 750px;
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 0.82rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.post-content {
  max-width: 760px;
  margin: 0 auto;
  padding: 56px 24px 80px;
}

.post-content h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: #fff;
  margin: 40px 0 14px;
  letter-spacing: -0.4px;
}
.post-content h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  margin: 28px 0 10px;
}
.post-content p {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.78;
  margin-bottom: 18px;
}
.post-content ul, .post-content ol {
  padding-left: 24px;
  margin-bottom: 18px;
}
.post-content li {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 6px;
}
.post-content strong { color: var(--text); }
.post-content a { color: var(--sun); text-decoration: underline; text-decoration-color: rgba(245,166,35,0.3); }
.post-content a:hover { text-decoration-color: var(--sun); }

.post-highlight {
  background: rgba(245,166,35,0.08);
  border-left: 3px solid var(--sun);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 18px 22px;
  margin: 28px 0;
  font-size: 0.95rem;
  color: var(--text);
  line-height: 1.7;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 0.9rem;
}
.data-table th {
  background: var(--card-bg);
  color: var(--text-muted);
  font-weight: 600;
  padding: 12px 16px;
  text-align: left;
  border-bottom: 2px solid var(--card-border);
}
.data-table td {
  padding: 11px 16px;
  border-bottom: 1px solid var(--card-border);
  color: var(--text-muted);
}
.data-table tr:hover td { background: rgba(255,255,255,0.02); }
.data-table td strong { color: var(--text); }

.post-cta-box {
  background: linear-gradient(135deg, rgba(245,166,35,0.1), rgba(255,140,0,0.05));
  border: 1px solid rgba(245,166,35,0.25);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
  margin: 48px 0 32px;
}
.post-cta-box h3 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 10px;
}
.post-cta-box p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 20px;
}
.post-cta-box .btn-primary { animation: none; }

.related-posts {
  padding: 60px 0 80px;
  background: var(--solar-mid);
  border-top: 1px solid var(--card-border);
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 32px;
}

/* ---- RESPONSIVE ---- */
@media (max-width: 900px) {
  .main-nav { display: none; }
  .nav-toggle { display: flex; }
  .calc-wrapper { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: 1fr 1fr; }
  .blog-grid { grid-template-columns: 1fr; }
  .blog-card.featured { grid-row: auto; }
  .cta-inner { flex-direction: column; text-align: center; }
  .footer-inner { grid-template-columns: 1fr; gap: 32px; }
  .footer-links { grid-template-columns: repeat(3, 1fr); }
  .related-grid { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  .hero { padding: 70px 0 60px; }
  .hero-stats { gap: 16px; }
  .features-grid { grid-template-columns: 1fr; }
  .result-cards { grid-template-columns: 1fr; }
  .footer-links { grid-template-columns: 1fr 1fr; }
  .footer-bottom .container { flex-direction: column; align-items: flex-start; }
}