/* ========================================
   Gear Head Proving Grounds Stylesheet
   ======================================== */

/* --- CSS Variables --- */
:root {
  --accent: #0078D7;
  --bg: #ffffff;
  --text: #111;
  --muted: #666;
}

/* --- Global Resets --- */
* {
  box-sizing: border-box;
}

body {
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial, Helvetica, sans-serif;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

/* --- Header --- */
.header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 20px;
  border-bottom: none;
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 999;
  box-shadow: 0 2px 6px rgba(0,0,0,0.03);
}

.header img {
  height: 112px;
  position: relative;
  z-index: 1001;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.3));
  margin-bottom: -40px;
}

.header a {
  display: block;
  line-height: 0;
}

.site-title {
  font-weight: 800;
  font-size: 18px;
}

/* --- Navigation --- */
.nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav a {
  color: var(--text);
  text-decoration: none;
  padding: 10px 12px;
  border-radius: 6px;
  display: inline-block;
  line-height: 1.6;
  white-space: nowrap;
}

.nav a:hover {
  background: #f3f8fd;
}

.dropdown {
  position: relative;
  display: inline-block;
}

.dropdown-content {
  display: none;
  position: absolute;
  background: white;
  min-width: 260px;
  box-shadow: 0 8px 24px rgba(30,30,30,0.08);
  z-index: 30;
  border-radius: 6px;
  padding: 10px 12px;
  line-height: 2.0;
  right: 0;
}

.dropdown-content div a {
  display: block;
  padding: 8px 12px;
  color: var(--text);
  text-decoration: none;
  border-radius: 4px;
}

.dropdown-content div a:hover {
  background: #f3f8fd;
}

.dropdown:hover .dropdown-content {
  display: block;
}

/* --- Containers --- */
.container {
  max-width: 1100px;
  margin: 20px auto;
  padding: 0 16px;
  margin-left: auto;
  margin-right: auto;
}

.hero {
  padding: 60px 16px 80px 16px;
  background-color: #333;
  background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('hero-background.jpg');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  background-attachment: scroll;
  border-bottom: 1px solid #f0f4f8;
  position: relative;
  width: 100%;
  margin: -20px 0 0 0;
  max-width: none;
}

.hero .card {
  background: transparent;
  border: none;
  box-shadow: none;
  max-width: 900px;
  margin: 0 auto;
  padding: 16px;
}

.hero h1 {
  color: #ffffff;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.8);
  margin: 6px 0;
}

.hero p {
  color: #ffffff;
  text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.8);
}

.hero .small-muted {
  color: #f0f0f0;
  text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.8);
}

.card {
  background: #fff;
  border: 1px solid #eee;
  padding: 16px;
  border-radius: 8px;
  margin: 12px 0;
  box-shadow: 0 1px 0 rgba(0,0,0,0.02);
}

/* --- Typography --- */
h1, h2 {
  margin: 6px 0;
}

/* --- Forms --- */
label {
  display: block;
  margin-top: 10px;
  font-weight: 600;
}

input, select, textarea {
  padding: 8px;
  margin-top: 6px;
  width: 260px;
  max-width: 100%;
  border: 1px solid #ccc;
  border-radius: 6px;
}

.btn {
  background: var(--accent);
  color: white;
  padding: 8px 12px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  margin-top: 10px;
}

.btn:hover {
  background: #005fa3;
}

/* --- Calculator Results --- */
.result-box {
  margin-top: 10px;
  padding: 12px;
  background: #f3f7fb;
  border: 1px solid #d7eaf8;
  border-radius: 8px;
  font-size: 1rem;
  color: #05213a;
}

.result-line {
  display: flex;
  justify-content: space-between;
  gap: 8px;
}

.result-label {
  color: #244;
  opacity: .9;
}

.result-value {
  color: var(--accent);
  font-weight: 700;
}

/* --- Calculator Styling --- */
.calc-card {
  max-width: 900px;
  margin: auto;
}

.calc-plain {
  background: #fff;
  border-radius: 10px;
  padding: 18px;
  box-shadow: 0 6px 18px rgba(0,0,0,0.06);
}

.small-muted {
  color: #666;
  font-size: 0.95rem;
}

/* --- Footer --- */
.footer {
  padding: 18px;
  text-align: center;
  color: var(--muted);
  border-top: 1px solid #eee;
  margin-top: 30px;
}

/* --- Logo Box --- */
.logo-box {
  text-align: center;
  padding: 20px;
}

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

/* --- Affiliate Ad Centering --- */
.affiliate-ad {
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 20px auto;
  max-width: 1100px;
  padding: 0 16px;
}

.affiliate-ad a {
  display: flex;
  justify-content: center;
  align-items: center;
}

.affiliate-ad img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* --- Calculator Navigation Links --- */
.cal-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 14px;
  margin: 10px auto 0;
  max-width: 700px;
}

.cal-nav a {
  background: var(--accent);
  color: #fff;
  padding: 10px 18px;
  border-radius: 6px;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.3s ease;
  min-width: 160px;
  text-align: center;
}

.cal-nav a:hover {
  background: #005fa3;
}

/* --- Sticky Footer Layout --- */
html, body {
  height: 100%;
  display: flex;
  flex-direction: column;
}

body > .header,
body > .hero,
body > .affiliate-ad,
body > .card,
body > .footer {
  flex-shrink: 0;
}

main {
  flex: 1 0 auto;
}

.footer {
  margin-top: auto;
}

/* ========================================
   HAMBURGER MENU STYLES
   ======================================== */

.hamburger {
  display: none;
  flex-direction: column;
  cursor: pointer;
  padding: 8px;
  margin-left: auto;
  background: none;
  border: none;
  z-index: 1001;
  position: relative;
}

.hamburger span {
  width: 25px;
  height: 3px;
  background-color: var(--text);
  margin: 3px 0;
  transition: 0.3s;
  border-radius: 2px;
}

/* Hamburger animation when menu is open */
.hamburger.active span:nth-child(1) {
  transform: rotate(-45deg) translate(-5px, 6px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(45deg) translate(-5px, -6px);
}

/* ========================================
   MOBILE RESPONSIVE STYLES
   ======================================== */

@media(max-width: 900px) {
  /* Header adjustments */
  .header {
    position: relative;
  }
  
  .header img {
    height: 95px;
  }
  
  .site-title {
    display: none;
  }
  
  /* Form inputs full width on mobile */
  input {
    width: 100%;
  }
  
  .cal-nav {
    justify-content: center;
  }
  
  /* Hide desktop nav, show hamburger */
  .nav {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: white;
    flex-direction: column;
    padding: 80px 20px 20px;
    overflow-y: auto;
    z-index: 1000;
    align-items: stretch;
  }
  
  .nav.active {
    display: flex;
  }
  
  .hamburger {
    display: flex !important;
    order: 10;
  }
  
  /* Mobile nav styling */
  .nav .dropdown {
    display: block;
    width: 100%;
    margin: 8px 0;
  }
  
  .nav .dropdown > a {
    display: block;
    padding: 16px;
    font-size: 18px;
    font-weight: 600;
    border-bottom: 1px solid #eee;
    margin: 0;
    background: #f9f9f9;
  }
  
  .nav .dropdown-content {
    position: static;
    display: none;
    box-shadow: none;
    min-width: auto;
    width: 100%;
    padding: 0;
    background: #fff;
    border-radius: 0;
    border-left: 3px solid var(--accent);
  }
  
  .nav .dropdown-content.active {
    display: block;
  }
  
  .nav .dropdown-content div {
    margin: 0;
  }
  
  .nav .dropdown-content a {
    display: block;
    padding: 14px 16px 14px 24px;
    margin: 0;
    border-bottom: 1px solid #eee;
    font-size: 16px;
    background: white;
  }
  
  .nav .dropdown-content a:hover {
    background: #f3f8fd;
  }
  
  .nav .dropdown-content a:last-child {
    border-bottom: none;
  }
}