/* ============================================
   TB1MSK Landing Page — Premium Style System
   ============================================ */

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

:root {
  /* Palette — refined, slightly desaturated */
  --bg-primary: #080c14;
  --bg-secondary: #0b1020;
  --bg-card: rgba(14, 20, 36, 0.45);
  --bg-card-hover: rgba(20, 28, 48, 0.55);
  --border-subtle: rgba(255, 255, 255, 0.04);
  --border-accent: rgba(34, 211, 167, 0.12);

  --text-primary: #edf0f7;
  --text-secondary: #94a0b8;
  --text-muted: #8a9bb0;

  --accent: #22d3a7;
  --accent-soft: rgba(34, 211, 167, 0.06);
  --accent-glow: rgba(34, 211, 167, 0.08);

  /* Typography */
  --font-display: 'Space Grotesk', -apple-system, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Consolas', monospace;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 5rem;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* Sizes */
  --nav-height: 72px;
  --max-width: 1080px;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.25s ease;
}

a:hover {
  color: #4ae0bb;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

img {
  max-width: 100%;
  display: block;
}

/* --- Utility --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.section {
  padding: clamp(3.5rem, 8vw, 7rem) 0;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-lg);
  display: block;
  opacity: 0.8;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
  line-height: 1.15;
  letter-spacing: -0.025em;
}

.section-desc {
  color: var(--text-secondary);
  max-width: 560px;
  line-height: 1.75;
  font-size: 0.9375rem;
}

.section-header {
  margin-bottom: var(--space-3xl);
}

.signal-line {
  display: block;
  width: 36px;
  height: 1px;
  background: var(--accent);
  margin-bottom: var(--space-lg);
  opacity: 0.35;
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(8, 12, 20, 0.75);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid transparent;
  z-index: 1000;
  transition: background 0.35s ease, border-color 0.35s ease;
}

.nav.scrolled {
  background: rgba(8, 12, 20, 0.92);
  border-bottom-color: var(--border-subtle);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-brand {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.06em;
  transition: opacity 0.25s ease;
}

.nav-brand:hover {
  opacity: 0.75;
  color: var(--text-primary);
}

.nav-brand span {
  color: var(--accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
  list-style: none;
}

.nav-links a {
  font-size: 0.8125rem;
  color: var(--text-muted);
  font-weight: 400;
  letter-spacing: 0.01em;
  transition: color 0.25s ease;
  position: relative;
  padding: var(--space-xs) 0;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--accent);
  opacity: 0;
  transform: scaleX(0);
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav-links a.active::after {
  transform: scaleX(1);
  opacity: 0.5;
}

/* Mobile menu toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--text-secondary);
  border-radius: 1px;
  transition: all 0.3s ease;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: rotate(45deg) translate(4.5px, 4.5px);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: rotate(-45deg) translate(4.5px, -4.5px);
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    justify-content: flex-start;
    padding-top: var(--space-3xl);
    gap: var(--space-2xl);
    background: rgba(8, 12, 20, 0.98);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    transform: translateX(100%);
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  }

  .nav-links.open {
    transform: translateX(0);
  }

  .nav-links a {
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--text-secondary);
  }
}

/* --- Hero --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: var(--nav-height);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  /* Concentric signal rings */
  background: repeating-radial-gradient(
    circle at 50% 46%,
    transparent 0px,
    transparent 79px,
    rgba(34, 211, 167, 0.022) 80px,
    transparent 81px
  );
}

/* Dot grid pattern */
.hero-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(34, 211, 167, 0.055) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse 55% 50% at 50% 44%, black 5%, transparent 65%);
  -webkit-mask-image: radial-gradient(ellipse 55% 50% at 50% 44%, black 5%, transparent 65%);
}

/* Central ambient glow */
.hero-bg::after {
  content: '';
  position: absolute;
  top: 42%;
  left: 50%;
  width: 1000px;
  height: 1000px;
  transform: translate(-50%, -50%);
  background: radial-gradient(
    circle,
    rgba(34, 211, 167, 0.05) 0%,
    rgba(34, 211, 167, 0.015) 35%,
    transparent 60%
  );
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 740px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid rgba(34, 211, 167, 0.08);
  padding: 0.375rem 1rem;
  border-radius: 100px;
  margin-bottom: var(--space-2xl);
}

.hero-badge::before {
  content: '';
  display: inline-block;
  width: 5px;
  height: 5px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse-dot 2.5s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.15; }
}

.hero-callsign {
  font-family: var(--font-mono);
  font-size: clamp(3.5rem, 13vw, 8rem);
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 0.95;
  margin-bottom: var(--space-xl);
  color: var(--text-primary);
  text-shadow: 0 0 80px rgba(34, 211, 167, 0.07);
}

.hero-callsign .prefix {
  color: var(--accent);
}

.hero-tagline {
  font-family: var(--font-display);
  font-size: clamp(1.125rem, 2.5vw, 1.4rem);
  color: var(--text-secondary);
  font-weight: 300;
  margin-bottom: clamp(2rem, 5vw, 4rem);
  letter-spacing: 0.01em;
  line-height: 1.5;
}

.hero-desc {
  color: var(--text-muted);
  font-size: 0.9375rem;
  max-width: 440px;
  margin: 0 auto var(--space-2xl);
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  justify-content: center;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 500;
  padding: 0.8125rem 1.75rem;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all 0.25s ease;
  text-decoration: none;
  letter-spacing: 0.01em;
}

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

.btn-primary:hover {
  background: #4ae0bb;
  color: var(--bg-primary);
  transform: translateY(-1px);
  box-shadow: 0 8px 32px rgba(34, 211, 167, 0.18);
}

.btn-secondary {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid rgba(255, 255, 255, 0.07);
}

.btn-secondary:hover {
  color: var(--text-primary);
  border-color: rgba(255, 255, 255, 0.13);
  background: rgba(255, 255, 255, 0.02);
}

/* --- About --- */
#hakkinda {
  background: var(--bg-secondary);
}

.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: var(--space-3xl);
  align-items: start;
}

.about-text p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.85;
  margin-bottom: var(--space-lg);
}

.about-text p:last-child {
  margin-bottom: 0;
}

.about-details {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.about-detail-item {
  display: flex;
  gap: var(--space-lg);
  padding: var(--space-lg) var(--space-md);
  border-radius: var(--radius-md);
  transition: background 0.3s ease;
}

.about-detail-item:hover {
  background: var(--bg-card);
}

.about-detail-icon {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  opacity: 0.55;
}

.about-detail-content h3 {
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
  letter-spacing: -0.01em;
}

.about-detail-content p {
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.6;
}

@media (max-width: 768px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }
}

/* --- Station --- */
.station-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.station-card {
  padding: var(--space-xl) var(--space-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  transition: background 0.3s ease, border-color 0.3s ease;
}

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

.station-card-label {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: var(--space-md);
}

.station-card-value {
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
  letter-spacing: -0.01em;
}

.station-card-note {
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.55;
}

/* --- Activities --- */
#aktiviteler {
  background: var(--bg-secondary);
}

.activity-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.activity-chip {
  position: relative;
  padding: var(--space-xl) var(--space-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  text-align: center;
  transition: background 0.3s ease, border-color 0.3s ease;
}

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

.activity-chip-icon {
  margin-bottom: var(--space-md);
  display: flex;
  justify-content: center;
  opacity: 0.6;
}

.activity-chip-title {
  font-family: var(--font-display);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
  letter-spacing: -0.01em;
}

.activity-chip-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.55;
}

/* --- QSL --- */
.qsl-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: start;
}

.qsl-info p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.85;
  margin-bottom: var(--space-md);
}

.qsl-status {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--accent);
  margin-bottom: var(--space-xl);
}

.qsl-status::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
}

.qsl-notes {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.qsl-note {
  padding: var(--space-lg) var(--space-xl);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-left: 2px solid rgba(34, 211, 167, 0.35);
  border-radius: var(--radius-md);
}

.qsl-note h3 {
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
  letter-spacing: -0.01em;
}

.qsl-note p {
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.6;
}

@media (max-width: 768px) {
  .qsl-content {
    grid-template-columns: 1fr;
  }
}

/* --- Contact --- */
#iletisim {
  background: var(--bg-secondary);
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.contact-card {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  padding: var(--space-xl) var(--space-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  transition: background 0.3s ease, border-color 0.3s ease;
  text-decoration: none;
  color: inherit;
}

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

.contact-card-icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.55;
}

.contact-card-info h3 {
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
  letter-spacing: -0.01em;
}

.contact-card-info p {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* --- Footer --- */
.footer {
  padding: var(--space-3xl) 0 var(--space-2xl);
  text-align: center;
}

.footer-callsign {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  margin-bottom: var(--space-md);
}

.footer-callsign span {
  color: var(--accent);
  opacity: 0.75;
}

.footer-copy {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: var(--space-sm);
}

.footer-note {
  font-size: 0.6875rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
  opacity: 0.85;
}

/* --- Scroll reveal --- */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.7s cubic-bezier(0.25, 0.46, 0.45, 0.94),
              transform 0.7s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
  }
}

/* --- Responsive --- */
@media (max-width: 900px) {
  .station-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .activity-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-lg);
  }

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

@media (max-width: 480px) {
  .hero-callsign {
    letter-spacing: 0.02em;
  }

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

  .activity-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .about-grid {
    grid-template-columns: 1fr;
  }

  .qsl-content {
    grid-template-columns: 1fr;
  }
}