/* ============================================
   Good Standing Room — Design System
   Brand identity: Calm, professional, warm
   All branding controlled via CSS custom properties
   ============================================ */

:root {
  /* Brand Palette */
  --gsr-navy: #0E1A2B;
  --gsr-jade: #2BAA9A;
  --gsr-mint: #DDF3EE;
  --gsr-sand: #F5E9DA;
  --gsr-clay: #E6A79A;
  --gsr-slate: #657385;
  --gsr-white: #FFFFFF;
  --gsr-ink: #071523;

  /* Semantic Tokens */
  --color-bg: var(--gsr-white);
  --color-surface: #FFFFFF;
  --color-text: var(--gsr-navy);
  --color-muted: var(--gsr-slate);
  --color-primary: var(--gsr-jade);
  --color-success: var(--gsr-jade);
  --color-success-bg: var(--gsr-mint);
  --color-accent-warm: var(--gsr-clay);
  --color-border: #E2E8F0;

  /* Typography */
  --font-heading: "Sora", system-ui, sans-serif;
  --font-body: "Inter", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;

  /* Radii */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-pill: 999px;

  /* Shadows */
  --shadow-card: 0 8px 24px rgba(14, 26, 43, 0.06);
  --shadow-elevated: 0 16px 48px rgba(14, 26, 43, 0.10);

  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;

  /* Layout */
  --max-width: 1200px;
  --nav-height: 72px;
}

/* Dark Mode */
[data-theme="dark"] {
  --color-bg: var(--gsr-ink);
  --color-surface: var(--gsr-navy);
  --color-text: #F8FAFC;
  --color-muted: #AAB6C5;
  --color-primary: var(--gsr-jade);
  --color-success: var(--gsr-jade);
  --color-success-bg: rgba(43, 170, 154, 0.18);
  --color-border: rgba(255, 255, 255, 0.1);
  --shadow-card: 0 12px 32px rgba(0, 0, 0, 0.32);
  --shadow-elevated: 0 20px 60px rgba(0, 0, 0, 0.4);
}

/* Dark mode logo swap */
[data-theme="dark"] .nav__brand-logo {
  content: url('/images/logo-light.svg');
}

/* ============================================
   Reset & Base
   ============================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-body);
  color: var(--color-text);
  line-height: 1.7;
  background: var(--color-bg);
  transition: background-color 0.3s ease, color 0.3s ease;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease, opacity 0.2s ease;
}

a:hover {
  opacity: 0.85;
}

img {
  max-width: 100%;
  height: auto;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--color-text);
  line-height: 1.2;
  margin-bottom: var(--space-4);
  font-weight: 800;
}

h1 { font-size: 3rem; letter-spacing: -0.02em; }
h2 { font-size: 2.25rem; letter-spacing: -0.015em; }
h3 { font-size: 1.5rem; letter-spacing: -0.01em; }
h4 { font-size: 1.25rem; }

p {
  margin-bottom: var(--space-4);
  color: var(--color-muted);
  line-height: 1.75;
}

code, .mono {
  font-family: var(--font-mono);
}

/* ============================================
   Layout
   ============================================ */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.section {
  padding: var(--space-8) 0;
}

.section--mint {
  background: var(--gsr-mint);
}

.section--sand {
  background: var(--gsr-sand);
}

.section--alt {
  background: linear-gradient(180deg, var(--color-bg) 0%, #FAF7F2 100%);
}

[data-theme="dark"] .section--alt {
  background: linear-gradient(180deg, var(--color-bg) 0%, rgba(14, 26, 43, 0.5) 100%);
}

[data-theme="dark"] .section--mint {
  background: rgba(43, 170, 154, 0.08);
}

[data-theme="dark"] .section--sand {
  background: rgba(245, 233, 218, 0.05);
}

/* ============================================
   Navigation
   ============================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  height: var(--nav-height);
  display: flex;
  align-items: center;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
}

.nav__brand:hover {
  opacity: 1;
}

.nav__brand-logo {
  width: 36px;
  height: 36px;
}

.nav__brand-text {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--color-text);
  line-height: 1.1;
}

.nav__brand-text span {
  display: block;
  font-size: 0.7rem;
  letter-spacing: 0.02em;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  list-style: none;
}

.nav__link {
  color: var(--color-text);
  font-weight: 500;
  font-size: 0.9rem;
  transition: color 0.2s;
}

.nav__link:hover {
  color: var(--color-primary);
  opacity: 1;
}

/* Dropdown */
.nav__dropdown {
  position: relative;
}

.nav__dropdown-toggle {
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav__dropdown-toggle::after {
  content: '';
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
  opacity: 0.5;
}

.nav__dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: -12px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-elevated);
  min-width: 200px;
  padding: var(--space-2) 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all 0.2s ease;
  list-style: none;
}

.nav__dropdown:hover .nav__dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav__dropdown-menu li a {
  display: block;
  padding: var(--space-3) var(--space-5);
  color: var(--color-text);
  font-size: 0.9rem;
  transition: background 0.15s;
}

.nav__dropdown-menu li a:hover {
  background: var(--gsr-mint);
  color: var(--color-primary);
  opacity: 1;
}

[data-theme="dark"] .nav__dropdown-menu li a:hover {
  background: rgba(43, 170, 154, 0.12);
}

/* Dark Mode Toggle */
.theme-toggle {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.1rem;
  transition: all 0.2s;
  color: var(--color-text);
}

.theme-toggle:hover {
  border-color: var(--color-primary);
  background: var(--color-success-bg);
}

/* Mobile Toggle */
.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 5px;
}

.nav__toggle span {
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all 0.3s;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  background: linear-gradient(180deg, var(--color-bg) 0%, #FAF7F2 100%);
  padding: var(--space-8) 0;
  text-align: center;
  min-height: 75vh;
  display: flex;
  align-items: center;
}

[data-theme="dark"] .hero {
  background: linear-gradient(180deg, var(--color-bg) 0%, rgba(14, 26, 43, 0.6) 100%);
}

.hero h1 {
  font-size: 3.5rem;
  margin-bottom: var(--space-5);
  max-width: 780px;
  margin-left: auto;
  margin-right: auto;
  letter-spacing: -0.03em;
}

.hero__subtitle {
  color: var(--color-muted);
  font-size: 1.2rem;
  max-width: 580px;
  margin: 0 auto var(--space-7);
  line-height: 1.7;
}

.hero__form {
  display: flex;
  gap: var(--space-3);
  max-width: 460px;
  margin: 0 auto;
  flex-wrap: wrap;
  justify-content: center;
}

.hero__form input[type="email"] {
  flex: 1;
  min-width: 240px;
  padding: var(--space-4) var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-family: var(--font-body);
  background: var(--color-surface);
  color: var(--color-text);
  outline: none;
  transition: border-color 0.2s;
}

.hero__form input[type="email"]:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(43, 170, 154, 0.12);
}

.hero__form input[type="email"]::placeholder {
  color: var(--color-muted);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3) var(--space-5);
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  font-family: var(--font-body);
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
  text-align: center;
  text-decoration: none;
  gap: var(--space-2);
}

.btn--primary {
  background: var(--color-primary);
  color: var(--gsr-white);
  box-shadow: 0 2px 8px rgba(43, 170, 154, 0.25);
}

.btn--primary:hover {
  background: #249488;
  color: var(--gsr-white);
  box-shadow: 0 4px 16px rgba(43, 170, 154, 0.35);
  transform: translateY(-1px);
  opacity: 1;
}

.btn--secondary {
  background: transparent;
  border: 1.5px solid var(--gsr-slate);
  color: var(--color-text);
}

.btn--secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  opacity: 1;
}

.btn--lg {
  padding: var(--space-4) var(--space-6);
  font-size: 1rem;
}

/* ============================================
   Status Chips
   ============================================ */
.chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  font-weight: 500;
}

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

.chip--warning {
  background: var(--gsr-sand);
  color: #B8860B;
}

.chip--alert {
  background: rgba(230, 167, 154, 0.2);
  color: #C0564A;
}

/* ============================================
   Page Header
   ============================================ */
.page-header {
  background: linear-gradient(180deg, var(--color-bg) 0%, #FAF7F2 100%);
  padding: var(--space-8) 0 var(--space-7);
  text-align: center;
}

[data-theme="dark"] .page-header {
  background: linear-gradient(180deg, var(--color-bg) 0%, rgba(14, 26, 43, 0.6) 100%);
}

.page-header h1 {
  margin-bottom: var(--space-3);
}

.page-header p {
  font-size: 1.15rem;
  max-width: 600px;
  margin: 0 auto;
}

/* ============================================
   Feature Cards
   ============================================ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-6);
  margin-top: var(--space-6);
}

.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: box-shadow 0.3s ease, transform 0.3s ease;
  box-shadow: var(--shadow-card);
}

.feature-card:hover {
  box-shadow: var(--shadow-elevated);
  transform: translateY(-3px);
}

.feature-card__icon {
  width: 52px;
  height: 52px;
  background: var(--color-success-bg);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-4);
  font-size: 1.5rem;
}

.feature-card h3 {
  font-size: 1.15rem;
  margin-bottom: var(--space-2);
}

.feature-card h3 a {
  color: var(--color-text);
}

.feature-card h3 a:hover {
  color: var(--color-primary);
}

.feature-card p {
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ============================================
   Content Sections
   ============================================ */
.content-section {
  padding: var(--space-8) 0;
}

.content-section h2 {
  text-align: center;
  margin-bottom: var(--space-7);
}

.content-section--left h2 {
  text-align: left;
  margin-bottom: var(--space-4);
}

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-7);
  align-items: center;
}

.two-col--reverse {
  direction: rtl;
}

.two-col--reverse > * {
  direction: ltr;
}

/* ============================================
   Industry / Use Case Content
   ============================================ */
.industry-content,
.usecase-content {
  padding: var(--space-7) 0;
}

.industry-content h2,
.usecase-content h2 {
  margin-top: var(--space-6);
  margin-bottom: var(--space-4);
}

.industry-content ul,
.usecase-content ul {
  list-style: none;
  padding: 0;
}

.industry-content ul li,
.usecase-content ul li {
  padding: var(--space-3) 0;
  padding-left: var(--space-6);
  position: relative;
  color: var(--color-muted);
  line-height: 1.7;
}

.industry-content ul li::before,
.usecase-content ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 18px;
  width: 20px;
  height: 20px;
  background: var(--color-success-bg);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.industry-content ul li::after,
.usecase-content ul li::after {
  content: '✓';
  position: absolute;
  left: 4px;
  top: 17px;
  color: var(--color-primary);
  font-weight: 700;
  font-size: 0.75rem;
}

/* Callout boxes */
.industry-content [style*="border-left"],
.usecase-content [style*="border-left"] {
  border-radius: var(--radius-md) !important;
}

/* ============================================
   CTA Section
   ============================================ */
.cta-section {
  background: var(--gsr-navy);
  color: #F8FAFC;
  padding: var(--space-8) 0;
  text-align: center;
}

[data-theme="dark"] .cta-section {
  background: var(--gsr-ink);
  border-top: 1px solid var(--color-border);
}

.cta-section h2 {
  color: #F8FAFC;
  margin-bottom: var(--space-3);
}

.cta-section p {
  color: #AAB6C5;
  margin-bottom: var(--space-6);
  font-size: 1.1rem;
}

/* ============================================
   Contact Form
   ============================================ */
.contact-form {
  max-width: 480px;
  margin: 0 auto;
}

.contact-form .form-group {
  margin-bottom: var(--space-5);
}

.contact-form label {
  display: block;
  font-weight: 500;
  margin-bottom: var(--space-2);
  color: var(--color-text);
  font-size: 0.9rem;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: var(--space-4) var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-family: var(--font-body);
  background: var(--color-surface);
  color: var(--color-text);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(43, 170, 154, 0.12);
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
  color: var(--color-muted);
}

.contact-form textarea {
  min-height: 120px;
  resize: vertical;
}

/* ============================================
   Footer
   ============================================ */
.footer {
  background: var(--gsr-navy);
  color: #AAB6C5;
  padding: var(--space-8) 0 var(--space-6);
}

[data-theme="dark"] .footer {
  background: var(--gsr-ink);
  border-top: 1px solid var(--color-border);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: var(--space-7);
  margin-bottom: var(--space-7);
}

.footer__brand h3 {
  color: #F8FAFC;
  font-family: var(--font-heading);
  margin-bottom: var(--space-3);
}

.footer__brand p {
  color: #AAB6C5;
  font-size: 0.9rem;
  line-height: 1.7;
}

.footer__col h4 {
  color: #F8FAFC;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-4);
  font-family: var(--font-body);
  font-weight: 600;
}

.footer__col ul {
  list-style: none;
}

.footer__col ul li {
  margin-bottom: var(--space-3);
}

.footer__col ul li a {
  color: #AAB6C5;
  font-size: 0.9rem;
  transition: color 0.2s;
}

.footer__col ul li a:hover {
  color: var(--gsr-jade);
  opacity: 1;
}

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: var(--space-5);
  text-align: center;
  font-size: 0.85rem;
  color: #657385;
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
  h1 { font-size: 2.25rem; }
  h2 { font-size: 1.75rem; }

  .hero {
    min-height: auto;
    padding: var(--space-7) 0;
  }

  .hero h1 {
    font-size: 2.5rem;
  }

  .hero__subtitle {
    font-size: 1.05rem;
  }

  .nav__links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-bg);
    flex-direction: column;
    padding: var(--space-4);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-elevated);
    gap: var(--space-2);
  }

  .nav__links.active {
    display: flex;
  }

  .nav__toggle {
    display: flex;
  }

  .nav__dropdown-menu {
    position: static;
    display: none;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    padding-left: var(--space-4);
    background: transparent;
    transition: none;
  }

  .nav__dropdown.is-open > .nav__dropdown-menu {
    display: block;
  }

  .nav__dropdown-toggle {
    display: flex;
    justify-content: space-between;
    width: 100%;
  }

  .nav__dropdown.is-open > .nav__link.nav__dropdown-toggle::after {
    transform: rotate(180deg);
  }

  /* Hamburger → X animation */
  .nav__toggle.is-open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav__toggle.is-open span:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
  }

  .nav__toggle.is-open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .two-col {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }

  .two-col--reverse {
    direction: ltr;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .footer__grid {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }

  .hero__form {
    flex-direction: column;
    align-items: stretch;
  }

  .hero__form input[type="email"] {
    min-width: auto;
  }

  .page-header {
    padding: var(--space-7) 0 var(--space-6);
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-4);
  }

  .section {
    padding: var(--space-7) 0;
  }

  .feature-card {
    padding: var(--space-5);
  }
}