/* GasTrack public site — shared styles (Task 53) */

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

html {
  scroll-behavior: smooth;
}

:root {
  --bg: #0a0a0a;
  --bg-card: #141414;
  --bg-elevated: #1a1a1a;
  --accent: #f5a623;
  --accent-dim: rgba(245, 166, 35, 0.12);
  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.6);
  --text-tertiary: rgba(255, 255, 255, 0.35);
  --border: rgba(255, 255, 255, 0.08);
  --border-accent: rgba(245, 166, 35, 0.3);
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  --font-display: "Syne", sans-serif;
  --font-body: "DM Sans", sans-serif;
  --max-width: 720px;
  --nav-height: 64px;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

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

/* ——— Nav ——— */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-logo {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  text-decoration: none;
}
.nav-logo:hover {
  color: var(--accent);
  text-decoration: none;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 8px 12px;
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: color 0.2s, background 0.2s;
}
.nav-link:hover {
  color: var(--text-primary);
  text-decoration: none;
  background: rgba(255, 255, 255, 0.06);
}
.nav-link.active {
  color: #000;
  background: var(--accent);
}

.lang-switcher {
  display: flex;
  gap: 4px;
  margin-left: 4px;
  padding-left: 8px;
  border-left: 1px solid var(--border);
}

.lang-btn {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 6px 10px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}
.lang-btn:hover {
  color: var(--text-primary);
  border-color: var(--text-tertiary);
}
.lang-btn.active {
  background: var(--accent);
  color: #000;
  border-color: var(--accent);
}

/* ——— Layout ——— */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 80px 0;
}

.section--tight {
  padding: 48px 0 80px;
}

/* ——— Typography ——— */
.display {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 6vw, 3rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.display .accent {
  color: var(--accent);
}

h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--border);
}

h2:first-child {
  margin-top: 0;
}

.legal h2 {
  font-size: 1.05rem;
}

p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

p:last-child {
  margin-bottom: 0;
}

ul {
  padding-left: 1.25rem;
  margin-bottom: 1rem;
  color: var(--text-secondary);
}

li {
  margin: 0.35rem 0;
}

strong {
  color: var(--text-primary);
  font-weight: 600;
}

.label {
  display: block;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 12px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-primary);
  background: var(--accent-dim);
  border: 1px solid var(--border-accent);
  padding: 8px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 20px;
}

/* ——— Cards ——— */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.card-accent {
  border-left: 3px solid var(--accent);
}

.card h2 {
  border-bottom-color: var(--border);
  margin-top: 0;
}
.card h2:not(:first-child) {
  margin-top: 1.75rem;
}

.card .feat-emoji {
  font-size: 2rem;
  line-height: 1;
  margin-bottom: 12px;
}

.card .feat-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text-primary);
  margin-bottom: 8px;
  border: none;
  padding: 0;
}

.card .feat-body {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin: 0;
}

/* ——— Buttons ——— */
.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 14px 22px;
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.15s, opacity 0.15s;
}
.btn:hover {
  opacity: 0.92;
  text-decoration: none;
}
.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--accent);
  color: #000;
}

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

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

/* ——— Features grid ——— */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  margin-top: 8px;
}

/* ——— Footer ——— */
.footer {
  padding: 48px 20px 40px;
  text-align: center;
  border-top: 1px solid var(--border);
}

.footer-logo {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.1rem;
  margin-bottom: 16px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  margin-bottom: 20px;
}

.footer-link {
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-decoration: none;
}
.footer-link:hover {
  color: var(--accent);
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--text-tertiary);
}

/* ——— Hero ——— */
.hero {
  padding-top: 100px;
  padding-bottom: 24px;
}

.hero .sub {
  font-size: 1.05rem;
  max-width: 540px;
  margin-bottom: 28px;
}

/* ——— Animations ——— */
.fade-in {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.delay-1 {
  transition-delay: 0.08s;
}
.delay-2 {
  transition-delay: 0.16s;
}
.delay-3 {
  transition-delay: 0.24s;
}
.delay-4 {
  transition-delay: 0.32s;
}
.delay-5 {
  transition-delay: 0.4s;
}
.delay-6 {
  transition-delay: 0.48s;
}

/* ——— Contact card ——— */
.contact-card strong {
  color: var(--text-primary);
}

/* ——— Account deletion form (Task 53D) ——— */
.delete-back {
  display: inline-block;
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 24px;
}
.delete-back:hover {
  color: var(--accent);
}

.delete-page .section--tight {
  padding-top: 32px;
}

.delete-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 32px 0;
}

.field {
  margin-bottom: 20px;
}

.field label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.field input,
.field select,
.field textarea {
  width: 100%;
  background: var(--bg-elevated);
  border: 0.5px solid var(--border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 15px;
  outline: none;
  transition: border-color 0.15s;
  appearance: none;
  -webkit-appearance: none;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(245, 166, 35, 0.12);
}

.field select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='rgba(255,255,255,0.4)' d='M6 8L0 0h12z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 40px;
}

.field textarea {
  resize: vertical;
  min-height: 80px;
}

.deletion-warning {
  background: rgba(226, 75, 74, 0.06);
  border: 0.5px solid rgba(226, 75, 74, 0.2);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 32px;
}

.deletion-warning ul {
  color: var(--text-secondary);
  margin: 12px 0 0;
  padding-left: 20px;
}

.success-card {
  background: var(--bg-card);
  border: 0.5px solid var(--border);
  border-left: 3px solid #2dd4bf;
  border-radius: var(--radius-lg);
  padding: 32px;
  text-align: center;
}

.success-icon {
  font-size: 40px;
  margin-bottom: 16px;
}

.in-app-note {
  background: var(--bg-card);
  border: 0.5px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-top: 32px;
  font-size: 14px;
  color: var(--text-secondary);
  text-align: center;
}

#confirmed-email {
  font-size: 1.1rem;
  word-break: break-all;
}

/* ——— Responsive ——— */
@media (max-width: 600px) {
  .nav {
    height: auto;
    min-height: var(--nav-height);
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    padding: 12px 16px;
  }

  .nav-links {
    width: 100%;
    justify-content: flex-start;
  }

  .lang-switcher {
    margin-left: 0;
    padding-left: 0;
    border-left: none;
    width: 100%;
  }

  .section {
    padding: 56px 0;
  }

  .hero {
    padding-top: 72px;
  }

  .btn-row {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }
}