/* ====================================================================
   WIFISERIAL 2.0 - DESIGN SYSTEM & THEMES
   ==================================================================== */

:root {
  /* DARK THEME (DEFAULT) */
  --bg-primary: #090d16;
  --bg-secondary: #0f172a;
  --bg-card: rgba(17, 24, 39, 0.75);
  --bg-card-hover: rgba(30, 41, 59, 0.85);
  --border: rgba(51, 65, 85, 0.4);
  --border-focus: #38bdf8;
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --accent: #38bdf8;
  --accent-glow: rgba(56, 189, 248, 0.25);
  --accent-gradient: linear-gradient(135deg, #38bdf8 0%, #6366f1 100%);
  --success: #10b981;
  --success-bg: rgba(16, 185, 129, 0.15);
  --warning: #f59e0b;
  --warning-bg: rgba(245, 158, 11, 0.15);
  --danger: #ef4444;
  --danger-bg: rgba(239, 68, 68, 0.15);

  --terminal-bg: #030712;
  --terminal-border: #1e293b;

  --header-bg: rgba(9, 13, 22, 0.85);
  --card-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

:root[data-theme="light"],
html[data-theme="light"],
body[data-theme="light"],
[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.95);
  --bg-card-hover: #f1f5f9;
  --border: rgba(203, 213, 225, 0.85);
  --border-focus: #0284c7;

  --text-main: #0f172a;
  --text-muted: #334155;
  --text-dim: #64748b;

  --accent: #0284c7;
  --accent-glow: rgba(2, 132, 199, 0.15);
  --accent-gradient: linear-gradient(135deg, #0284c7 0%, #4f46e5 100%);

  --terminal-bg: #0f172a;
  --terminal-border: #334155;

  --header-bg: rgba(255, 255, 255, 0.95);
  --card-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.08);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* CONTAINER & LAYOUT */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* NAVBAR */
header.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--header-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-logo {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 800;
  font-size: 1.15rem;
  box-shadow: 0 4px 14px var(--accent-glow);
}

.brand-text h1 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

.brand-text span {
  font-size: 0.72rem;
  color: var(--accent);
  text-transform: uppercase;
  font-weight: 600;
  letter-spacing: 0.05em;
  display: block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.92rem;
  font-weight: 500;
  transition: var(--transition);
}

.nav-links a:hover {
  color: var(--accent);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* CONTROLS (THEME & LANG) */
.btn-icon {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-main);
  width: 38px;
  height: 38px;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
  font-size: 1.1rem;
}

.btn-icon:hover {
  border-color: var(--accent);
  background: var(--bg-card-hover);
  transform: translateY(-1px);
}

.lang-select {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-main);
  padding: 6px 10px;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  outline: none;
  transition: var(--transition);
}

.lang-select option {
  background: var(--bg-secondary);
  color: var(--text-main);
}

.lang-select:focus, .lang-select:hover {
  border-color: var(--accent);
}

/* BUTTONS */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 8px;
  font-size: 0.92rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  border: none;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #fff;
  box-shadow: 0 4px 16px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--accent-glow);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-main);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  border-color: var(--accent);
  background: var(--bg-card-hover);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.82rem;
}

/* HERO SECTION */
.hero {
  padding: 80px 0 60px;
  text-align: center;
  position: relative;
}

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: var(--accent-glow);
  border: 1px solid rgba(56, 189, 248, 0.3);
  border-radius: 30px;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--success);
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.hero h2 {
  font-size: 2.85rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.hero h2 span.gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p.lead {
  font-size: 1.18rem;
  color: var(--text-muted);
  max-width: 720px;
  margin: 0 auto 36px;
  font-weight: 400;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

/* HIGHLIGHTS BAR */
.highlights-bar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-top: 20px;
}

.highlight-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 16px 20px;
  border-radius: 12px;
  text-align: left;
  display: flex;
  align-items: center;
  gap: 14px;
}

.highlight-icon {
  font-size: 1.6rem;
}

.highlight-info h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
}

.highlight-info p {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* SECTION STYLES */
section {
  padding: 80px 0;
  border-top: 1px solid var(--border);
}

.section-title-wrap {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 48px;
}

.section-label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--accent);
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.section-title {
  font-size: 2.1rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--text-muted);
}

/* ARCHITECTURE DIAGRAM (SVG & ANIMATIONS) */
.diagram-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px 24px;
  box-shadow: var(--card-shadow);
  position: relative;
  overflow: hidden;
}

.diagram-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  position: relative;
  align-items: center;
}

@media (max-width: 900px) {
  .diagram-grid { grid-template-columns: 1fr; gap: 32px; }
}

.diagram-node {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px 18px;
  text-align: center;
  position: relative;
  transition: var(--transition);
  cursor: pointer;
}

.diagram-node:hover, .diagram-node.active {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px var(--accent-glow);
}

.node-icon {
  font-size: 2.2rem;
  margin-bottom: 12px;
}

.node-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 4px;
}

.node-desc {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.node-tag {
  display: inline-block;
  margin-top: 10px;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(56, 189, 248, 0.1);
  color: var(--accent);
}

.diagram-connector {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-family: monospace;
  font-size: 0.75rem;
  font-weight: 700;
}

/* PRODUCTS SECTION */
.products-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

@media (max-width: 900px) {
  .products-grid { grid-template-columns: 1fr; }
}

.product-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 36px 32px;
  position: relative;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  box-shadow: var(--card-shadow);
  overflow: hidden;
}

.product-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--accent-gradient);
  opacity: 0.8;
}

.product-card.product-rs485::before {
  background: linear-gradient(135deg, #f59e0b 0%, #10b981 100%);
}

.product-card:hover {
  transform: translateY(-6px);
  border-color: var(--accent);
  box-shadow: 0 20px 40px -15px var(--accent-glow);
}

.product-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 20px;
}

.product-icon-wrap {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: var(--accent-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
}

.product-badge {
  font-size: 0.76rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-available {
  background: var(--success-bg);
  color: var(--success);
  border: 1px solid rgba(16, 185, 129, 0.4);
}

.badge-upcoming {
  background: var(--warning-bg);
  color: var(--warning);
  border: 1px solid rgba(245, 158, 11, 0.4);
}

.product-card h3 {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 6px;
  letter-spacing: -0.02em;
}

.product-edition {
  font-size: 0.88rem;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 16px;
}

.product-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 24px;
}

.product-specs {
  list-style: none;
  margin-bottom: 28px;
  flex: 1;
}

.product-specs li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--text-main);
  margin-bottom: 12px;
  line-height: 1.5;
}

.product-specs li .check {
  color: var(--success);
  font-weight: 700;
  flex-shrink: 0;
}

/* FEATURE GRID */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.feature-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 28px;
  transition: var(--transition);
}

.feature-box:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: var(--card-shadow);
}

.feature-icon-wrapper {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: var(--accent-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 18px;
  color: var(--accent);
}

.feature-box h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.feature-box p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* CLIENT PORTAL INTERACTIVE SECTION */
.portal-interactive {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 24px;
}

@media (max-width: 900px) {
  .portal-interactive { grid-template-columns: 1fr; }
}

.portal-auth-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 28px;
  box-shadow: var(--card-shadow);
}

.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  font-size: 0.84rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-main);
}

.form-control {
  width: 100%;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--text-main);
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 0.92rem;
  font-family: inherit;
  outline: none;
  transition: var(--transition);
}

.form-control:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.portal-demo-hint {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 14px;
  line-height: 1.5;
  background: var(--bg-secondary);
  padding: 12px;
  border-radius: 8px;
  border: 1px dashed var(--border);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.portal-demo-hint .btn-demo-autofill {
  background: var(--accent-glow);
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 8px 14px;
  border-radius: 6px;
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: var(--transition);
  width: 100%;
}

.portal-demo-hint .btn-demo-autofill:hover {
  background: var(--accent);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px var(--accent-glow);
}

.flash-highlight {
  border-color: var(--accent) !important;
  box-shadow: 0 0 0 3px var(--accent-glow) !important;
  animation: pulseHighlight 0.8s ease-out;
}

@keyframes pulseHighlight {
  0% { transform: scale(1); }
  50% { transform: scale(1.02); }
  100% { transform: scale(1); }
}

/* TERMINAL VIEW */
.terminal-window {
  background: var(--terminal-bg);
  border: 1px solid var(--terminal-border);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  height: 480px;
  overflow: hidden;
  box-shadow: var(--card-shadow);
}

.terminal-header {
  background: #111827;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid #1f2937;
}

.terminal-dots {
  display: flex;
  gap: 6px;
}

.terminal-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.dot-red { background: #ef4444; }
.dot-yellow { background: #f59e0b; }
.dot-green { background: #10b981; }

.terminal-title {
  font-family: 'JetBrains Mono', Consolas, monospace;
  font-size: 0.75rem;
  color: #94a3b8;
}

.terminal-body {
  flex: 1;
  padding: 14px;
  overflow-y: auto;
  font-family: 'JetBrains Mono', Consolas, monospace;
  font-size: 0.82rem;
  line-height: 1.5;
  color: #e5e7eb;
}

.terminal-log-line {
  margin-bottom: 4px;
  word-break: break-all;
}

.ts-tag { color: #64748b; margin-right: 8px; user-select: none; }
.dir-tag {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 4px;
  margin-right: 8px;
  user-select: none;
}
.dir-esp { background: rgba(16, 185, 129, 0.2); color: #34d399; }
.dir-putty { background: rgba(245, 158, 11, 0.2); color: #fbbf24; }
.dir-sys { background: rgba(56, 189, 248, 0.2); color: #38bdf8; }

/* CONFIG BACKUPS TABLE */
.backups-table-wrap {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  box-shadow: var(--card-shadow);
}

table.backups-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.88rem;
}

table.backups-table th {
  background: var(--bg-secondary);
  padding: 14px 18px;
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border);
}

table.backups-table td {
  padding: 16px 18px;
  border-bottom: 1px solid var(--border);
  color: var(--text-main);
}

table.backups-table tr:last-child td {
  border-bottom: none;
}

table.backups-table tr:hover td {
  background: var(--bg-card-hover);
}

.badge-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 8px;
  border-radius: 12px;
  font-size: 0.74rem;
  font-weight: 600;
}

.status-ok { background: var(--success-bg); color: var(--success); }

/* DIFF MODAL */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  z-index: 999;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-overlay.active {
  display: flex;
}

.modal-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 14px;
  width: 100%;
  max-width: 820px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.6);
  animation: modalFadeIn 0.25s ease-out;
}

@keyframes modalFadeIn {
  from { opacity: 0; transform: scale(0.97); }
  to { opacity: 1; transform: scale(1); }
}

.modal-header {
  padding: 18px 24px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h3 {
  font-size: 1.15rem;
  font-weight: 700;
}

.btn-close {
  background: transparent;
  border: none;
  font-size: 1.4rem;
  color: var(--text-muted);
  cursor: pointer;
}

.modal-body {
  padding: 20px 24px;
  overflow-y: auto;
  font-family: 'JetBrains Mono', Consolas, monospace;
  font-size: 0.82rem;
  line-height: 1.5;
}

.diff-line {
  padding: 2px 6px;
  border-radius: 3px;
  margin-bottom: 2px;
  white-space: pre-wrap;
}

.diff-add { background: rgba(16, 185, 129, 0.2); color: #34d399; }
.diff-remove { background: rgba(239, 68, 68, 0.2); color: #f87171; text-decoration: line-through; }
.diff-ctx { color: #94a3b8; }

.modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
  gap: 12px;
}

/* SHIELDING BADGE / FOOTER */
.security-banner {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 40px;
}

.shield-badge {
  display: flex;
  align-items: center;
  gap: 12px;
}

.shield-icon {
  font-size: 2rem;
  color: var(--success);
}

footer {
  padding: 40px 0 30px;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-dim);
}