/* ============================================================
   ExperTone Media Co. — Design System
   Brand: Green #008060 · Dark #0f172a · Grey #64748b
   ============================================================ */

/* --- CSS Variables --- */
:root {
  --green: #008060;
  --green-light: #00a87e;
  --green-dark: #005c46;
  --dark: #0f172a;
  --dark-2: #1e293b;
  --grey: #64748b;
  --grey-light: #94a3b8;
  --light: #f8fafc;
  --light-2: #f1f5f9;
  --border: #e2e8f0;
  --white: #ffffff;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow: 0 4px 24px rgba(0,0,0,0.06);
  --shadow-lg: 0 12px 48px rgba(0,0,0,0.08);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-display: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --max-width: 1200px;
  --nav-height: 72px;
}

/* --- Reset & Base --- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 100px; }

body {
  font-family: var(--font-body);
  color: var(--dark-2);
  line-height: 1.7;
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection { background: var(--green); color: #fff; }

/* --- Typography --- */
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 700; line-height: 1.2; }
h1 { font-size: clamp(36px, 5vw, 56px); letter-spacing: -0.02em; }
h2 { font-size: clamp(28px, 4vw, 40px); letter-spacing: -0.01em; }
h3 { font-size: 22px; }
p { color: var(--grey); margin-bottom: 1rem; }

/* --- Links --- */
a { color: var(--green); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--green-dark); }

/* --- Layout --- */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.section { padding: 100px 0; }
.section-sm { padding: 60px 0; }
.section-label {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--green);
  margin-bottom: 16px;
}
.section-title { margin-bottom: 16px; }
.section-sub {
  font-size: 18px;
  color: var(--grey);
  max-width: 600px;
  margin-bottom: 48px;
}
.text-center { text-align: center; }
.text-center .section-sub { margin-left: auto; margin-right: auto; }

/* --- Buttons --- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 32px; border-radius: var(--radius);
  font-family: var(--font-display); font-weight: 600; font-size: 15px;
  cursor: pointer; border: none; text-decoration: none;
  transition: all var(--transition); position: relative; overflow: hidden;
}
.btn-primary { background: var(--green); color: #fff; }
.btn-primary:hover { background: var(--green-dark); color: #fff; transform: translateY(-1px); box-shadow: 0 8px 24px rgba(0,128,96,0.25); }
.btn-outline { background: transparent; color: var(--green); border: 2px solid var(--green); }
.btn-outline:hover { background: var(--green); color: #fff; }
.btn-white { background: #fff; color: var(--dark); }
.btn-white:hover { background: var(--light); transform: translateY(-1px); box-shadow: var(--shadow); }
.btn-lg { padding: 18px 40px; font-size: 17px; border-radius: var(--radius-lg); }

/* --- Grid --- */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

/* --- Cards --- */
.card {
  background: var(--white); border-radius: var(--radius-lg);
  padding: 36px; border: 1px solid var(--border);
  transition: all var(--transition);
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: transparent; }
.card-icon {
  width: 56px; height: 56px; border-radius: 16px;
  background: linear-gradient(135deg, var(--green), var(--green-light));
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; margin-bottom: 20px; color: #fff;
}
.card h3 { margin-bottom: 8px; font-size: 20px; }
.card p { font-size: 15px; }

/* --- Nav (shared across all pages) --- */
.site-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: var(--nav-height); display: flex; align-items: center;
  transition: all var(--transition);
  background: rgba(255,255,255,0);
  backdrop-filter: blur(0px);
}
.site-nav.scrolled {
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow-sm);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--max-width); width: 100%; margin: 0 auto;
  padding: 0 24px; display: flex; justify-content: space-between; align-items: center;
}
.nav-logo { font-family: var(--font-display); font-size: 20px; font-weight: 800; color: var(--dark); text-decoration: none; }
.nav-logo span { color: var(--green); }
.nav-links { display: flex; align-items: center; gap: 8px; }
.nav-links a {
  color: var(--grey); text-decoration: none; margin: 0 4px; padding: 8px 14px;
  font-size: 14px; font-weight: 500; border-radius: var(--radius);
  transition: all var(--transition);
}
.nav-links a:hover, .nav-links a.active { color: var(--green); background: rgba(0,128,96,0.06); }
.nav-lang { margin-left: 12px; padding-left: 12px; border-left: 1px solid var(--border); }

.nav-lang-btn {
  background: none; border: 1px solid var(--border); border-radius: 8px;
  padding: 6px 12px; cursor: pointer; font-size: 13px; font-weight: 600;
  color: var(--grey); font-family: var(--font-body); transition: all var(--transition);
}
.nav-lang-btn:hover { border-color: var(--green); color: var(--green); }

/* Mobile menu */
.nav-toggle {
  display: none; background: none; border: none; cursor: pointer;
  flex-direction: column; gap: 5px; padding: 8px;
}
.nav-toggle span {
  display: block; width: 24px; height: 2px; background: var(--dark);
  border-radius: 2px; transition: all var(--transition);
}
.nav-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

.nav-mobile {
  display: none; position: fixed; top: var(--nav-height); left: 0; right: 0;
  background: rgba(255,255,255,0.95); backdrop-filter: blur(20px);
  padding: 24px; border-bottom: 1px solid var(--border);
  flex-direction: column; gap: 8px;
}
.nav-mobile.open { display: flex; }
.nav-mobile a {
  display: block; padding: 12px 16px; color: var(--dark);
  font-weight: 500; border-radius: var(--radius); font-size: 16px;
}
.nav-mobile a:hover { background: var(--light); color: var(--green); }

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
}

/* --- Hero Variants --- */
.hero {
  padding: 160px 0 100px; text-align: center;
  background: linear-gradient(180deg, var(--light) 0%, var(--white) 100%);
}
.hero h1 { margin-bottom: 20px; }
.hero h1 span { color: var(--green); }
.hero p { font-size: 18px; color: var(--grey); max-width: 640px; margin: 0 auto 36px; }
.hero .btn-group { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

.page-hero {
  padding: 140px 0 80px; background: linear-gradient(180deg, var(--light) 0%, var(--white) 100%);
  text-align: center;
}
.page-hero h1 { margin-bottom: 12px; }
.page-hero p { font-size: 18px; color: var(--grey); max-width: 600px; margin: 0 auto; }

/* --- Dark Section --- */
.section-dark {
  background: var(--dark); color: #fff;
  border-radius: var(--radius-lg);
  padding: 80px 60px; text-align: center; margin: 0 24px;
}
.section-dark h2 { color: #fff; }
.section-dark p { color: var(--grey-light); }
.section-dark .btn-white { margin-top: 24px; }

/* --- Footer --- */
.site-footer {
  background: var(--dark); color: var(--grey-light); padding: 60px 24px 40px;
  text-align: center;
}
.footer-inner { max-width: var(--max-width); margin: 0 auto; }
.footer-logo { font-family: var(--font-display); font-size: 20px; font-weight: 800; color: #fff; margin-bottom: 12px; }
.footer-logo span { color: var(--green); }
.footer-links { display: flex; justify-content: center; gap: 24px; flex-wrap: wrap; margin: 20px 0; }
.footer-links a { color: var(--grey-light); font-size: 14px; }
.footer-links a:hover { color: var(--green); }
.footer-bottom { font-size: 13px; color: var(--grey); margin-top: 24px; padding-top: 24px; border-top: 1px solid rgba(255,255,255,0.08); }

/* --- Product Cards --- */
.product-card {
  display: grid; grid-template-columns: 100px 1fr; gap: 32px; align-items: center;
  background: var(--light); border-radius: var(--radius-lg); padding: 40px;
  margin-bottom: 24px; transition: all var(--transition); border: 1px solid transparent;
}
.product-card:hover { border-color: var(--green); box-shadow: var(--shadow); }
.product-icon {
  width: 100px; height: 100px; border-radius: 24px;
  background: linear-gradient(135deg, var(--green), var(--green-light));
  display: flex; align-items: center; justify-content: center; font-size: 40px; flex-shrink: 0;
}
.product-card h3 { font-size: 22px; margin-bottom: 8px; }
.product-card p { margin-bottom: 16px; }
.tags { display: flex; gap: 8px; flex-wrap: wrap; }
.tag {
  padding: 4px 14px; background: var(--white); border: 1px solid var(--border);
  border-radius: 20px; font-size: 12px; color: var(--grey); font-weight: 500;
}

/* --- Portfolio Items --- */
.portfolio-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(360px, 1fr)); gap: 24px; }
.portfolio-card {
  background: var(--white); border-radius: var(--radius-lg);
  padding: 32px; border: 1px solid var(--border);
  transition: all var(--transition);
}
.portfolio-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: transparent; }
.portfolio-card h3 { font-size: 20px; margin-bottom: 8px; }
.portfolio-card p { font-size: 14px; margin-bottom: 16px; }
.portfolio-card .tech-stack {
  display: flex; gap: 8px; flex-wrap: wrap;
}
.tech-tag { padding: 3px 10px; background: rgba(0,128,96,0.08); border-radius: 6px; font-size: 12px; color: var(--green); font-weight: 600; }

/* --- Contact Form --- */
.contact-form {
  max-width: 600px; margin: 0 auto;
}
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block; font-size: 14px; font-weight: 600; color: var(--dark);
  margin-bottom: 6px;
}
.form-group input, .form-group textarea, .form-group select {
  width: 100%; padding: 14px 16px; border: 2px solid var(--border);
  border-radius: var(--radius); font-family: var(--font-body); font-size: 15px;
  transition: all var(--transition); background: var(--white); color: var(--dark-2);
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  outline: none; border-color: var(--green); box-shadow: 0 0 0 4px rgba(0,128,96,0.08);
}
.form-group textarea { min-height: 140px; resize: vertical; }
.form-group .error-msg { color: #dc2626; font-size: 13px; margin-top: 4px; display: none; }
.form-group.error input, .form-group.error textarea { border-color: #dc2626; }
.form-group.error .error-msg { display: block; }
.form-status { text-align: center; padding: 12px; border-radius: var(--radius); margin-top: 16px; display: none; }
.form-status.success { display: block; background: #dcfce7; color: #166534; }
.form-status.error { display: block; background: #fef2f2; color: #991b1b; }
.form-status.loading { display: block; background: #eff6ff; color: #1e40af; }

/* --- WhatsApp Float --- */
.whatsapp-float {
  position: fixed; bottom: 24px; right: 24px; z-index: 9999;
  width: 56px; height: 56px; background: #25d366; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 16px rgba(37,211,102,0.4);
  transition: transform 0.2s;
}
.whatsapp-float:hover { transform: scale(1.1); }
.whatsapp-float svg { width: 28px; height: 28px; fill: #fff; }

/* --- Stats --- */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 32px; text-align: center; }
.stat-item h3 { font-size: 48px; font-weight: 800; color: var(--green); font-family: var(--font-display); }
.stat-item p { font-size: 15px; color: var(--grey); margin-top: 4px; }

/* --- Process / Timeline --- */
.process-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 24px; counter-reset: process; }
.process-step { position: relative; padding: 32px; background: var(--light); border-radius: var(--radius-lg); }
.process-step::before {
  counter-increment: process; content: counter(process);
  width: 40px; height: 40px; border-radius: 12px; background: var(--green);
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 700; font-size: 18px; margin-bottom: 16px;
}
.process-step h3 { font-size: 18px; margin-bottom: 8px; }
.process-step p { font-size: 14px; }

/* --- About Values --- */
.values-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 24px; }
.value-card { text-align: center; padding: 40px 24px; background: var(--light); border-radius: var(--radius-lg); transition: all var(--transition); }
.value-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.value-icon { font-size: 40px; margin-bottom: 16px; }
.value-card h3 { margin-bottom: 8px; }

/* --- Page Header BG --- */
.bg-pattern {
  position: absolute; top: 0; left: 0; right: 0; height: 400px;
  background: radial-gradient(ellipse at 50% 0%, rgba(0,128,96,0.04) 0%, transparent 70%);
  pointer-events: none; z-index: 0;
}

/* --- Animations --- */
.fade-up {
  opacity: 0; transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.fade-up.visible { opacity: 1; transform: translateY(0); }
.fade-in { opacity: 0; transition: opacity 0.7s ease; }
.fade-in.visible { opacity: 1; }
.scale-in {
  opacity: 0; transform: scale(0.95);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.scale-in.visible { opacity: 1; transform: scale(1); }
.slide-left {
  opacity: 0; transform: translateX(-40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.slide-left.visible { opacity: 1; transform: translateX(0); }
.slide-right {
  opacity: 0; transform: translateX(40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.slide-right.visible { opacity: 1; transform: translateX(0); }

.delay-100 { transition-delay: 0.1s; }
.delay-200 { transition-delay: 0.2s; }
.delay-300 { transition-delay: 0.3s; }
.delay-400 { transition-delay: 0.4s; }
.delay-500 { transition-delay: 0.5s; }

/* --- Counter --- */
.counter { font-variant-numeric: tabular-nums; }

/* --- Responsive --- */
@media (max-width: 1024px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .section { padding: 60px 0; }
  .hero { padding: 120px 0 60px; }
  .page-hero { padding: 120px 0 60px; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .product-card { grid-template-columns: 1fr; text-align: center; }
  .product-icon { margin: 0 auto; }
  .portfolio-grid { grid-template-columns: 1fr; }
  .section-dark { margin: 0 12px; padding: 40px 24px; border-radius: var(--radius); }
  .hero .btn-group { flex-direction: column; align-items: center; }
  .hero .btn-group .btn { width: 100%; max-width: 280px; text-align: center; justify-content: center; }
}