/* PassoHeat - Stylesheet */
/* Font: Exo 2 (headings, full Cyrillic) + Nunito Sans (body, full Cyrillic) */
/* Colors: Navy #1B2A4A, Orange #F5820D, Green #2ECC71, White #FAFAFA */

:root {
  --navy: #1B2A4A;
  --navy-light: #243558;
  --orange: #F5820D;
  --orange-light: #FF9E3D;
  --green: #2ECC71;
  --white: #FAFAFA;
  --gray: #F0F2F5;
  --gray-dark: #8892A4;
  --text: #1B2A4A;
  --text-light: #5A6A82;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 4px 24px rgba(27,42,74,0.10);
  --shadow-lg: 0 8px 48px rgba(27,42,74,0.16);
  --transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Nunito Sans', sans-serif;
  color: var(--text);
  background: var(--white);
  line-height: 1.6;
  overflow-x: hidden;
}

h1,h2,h3,h4 { font-family: 'Exo 2', sans-serif; line-height: 1.15; }

a { color: inherit; text-decoration: none; }

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

.container { max-width: 1140px; margin: 0 auto; padding: 0 24px; }

.nav-logo { text-decoration: none; }
.nav-logo-text {
  font-family: 'Exo 2', sans-serif;
  font-size: 1.4rem; font-weight: 800;
  color: var(--white); letter-spacing: -0.02em;
}
.nav-logo-text span { color: var(--orange); }

.footer-addr { color: rgba(255,255,255,0.3); font-size: 0.78rem; margin-top: 4px; }

.footer-logo-text {
  display: block;
  font-family: 'Exo 2', sans-serif;
  font-size: 1.6rem; font-weight: 800;
  color: var(--white); letter-spacing: -0.02em;
  margin-bottom: 10px;
}
.footer-logo-text span { color: var(--orange); }
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(27,42,74,0.97);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  transition: var(--transition);
}
.nav-inner {
  display: flex; align-items: center; gap: 32px;
  height: 68px; max-width: 1140px; margin: 0 auto; padding: 0 24px;
}
.nav-logo img { height: 36px; }
.nav-links { display: flex; gap: 28px; margin-left: auto; }
.nav-links a {
  color: rgba(255,255,255,0.8); font-size: 0.9rem; font-weight: 500;
  letter-spacing: 0.02em; transition: var(--transition);
}
.nav-links a:hover { color: var(--orange); }

/* ── LANGUAGE DROPDOWN ── */
.lang-dropdown { position: relative; }

.lang-current {
  display: flex; align-items: center; gap: 6px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: 8px; padding: 6px 10px;
  color: rgba(255,255,255,0.85); font-family: 'Exo 2', sans-serif;
  font-size: 0.82rem; font-weight: 600; cursor: pointer;
  transition: var(--transition); white-space: nowrap;
}
.lang-current:hover {
  background: rgba(245,130,13,0.15);
  border-color: rgba(245,130,13,0.4);
  color: var(--white);
}
.lang-current img { border-radius: 2px; flex-shrink: 0; }
.lang-chevron {
  transition: transform 0.2s ease;
  opacity: 0.7; flex-shrink: 0;
}
.lang-dropdown.open .lang-chevron { transform: rotate(180deg); }

.lang-menu {
  display: none; position: absolute; top: calc(100% + 6px); right: 0;
  background: var(--navy-light);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 10px; overflow: hidden;
  min-width: 150px; list-style: none;
  box-shadow: 0 8px 32px rgba(0,0,0,0.3);
  z-index: 200;
}
.lang-menu--up { top: auto; bottom: calc(100% + 6px); }
.lang-dropdown.open .lang-menu { display: block; }

.lang-option {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 14px; color: rgba(255,255,255,0.75);
  font-size: 0.88rem; font-weight: 500;
  transition: var(--transition); cursor: pointer;
}
.lang-option:hover { background: rgba(255,255,255,0.07); color: var(--white); }
.lang-option.active { color: var(--orange); }
.lang-option img { border-radius: 2px; flex-shrink: 0; }
.lang-check { margin-left: auto; font-size: 0.75rem; color: var(--orange); }

/* Footer dropdown slight variant */
.lang-dropdown--footer .lang-current {
  background: rgba(255,255,255,0.05);
  border-color: rgba(255,255,255,0.1);
}

/* Footer pages links */
.footer-right { display: flex; flex-direction: column; align-items: flex-end; gap: 16px; }
.footer-pages { display: flex; gap: 20px; flex-wrap: wrap; justify-content: flex-end; }
.footer-pages a {
  color: rgba(255,255,255,0.45); font-size: 0.82rem;
  transition: var(--transition);
}
.footer-pages a:hover { color: var(--orange); }

.nav-hamburger {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 4px;
}
.nav-hamburger span {
  display: block; width: 22px; height: 2px;
  background: var(--white); border-radius: 2px;
  transition: var(--transition);
}

/* ── HERO ── */
.hero {
  position: relative; min-height: 100vh;
  background: linear-gradient(135deg, var(--navy) 0%, #0D1B35 60%, #162040 100%);
  display: flex; align-items: center;
  padding: 100px 0 60px; overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0; pointer-events: none;
  overflow: hidden;
}
.hero-sun {
  position: absolute; top: -120px; right: -80px;
  width: 500px; height: 500px; border-radius: 50%;
  background: radial-gradient(circle, rgba(245,130,13,0.25) 0%, rgba(245,130,13,0.05) 50%, transparent 70%);
  animation: pulse 4s ease-in-out infinite;
}
.hero-rays {
  position: absolute; top: -100px; right: -60px;
  width: 460px; height: 460px;
  background: repeating-conic-gradient(
    rgba(245,130,13,0.06) 0deg 10deg,
    transparent 10deg 20deg
  );
  border-radius: 50%;
  animation: spin 30s linear infinite;
}
@keyframes pulse { 0%,100%{transform:scale(1);opacity:1} 50%{transform:scale(1.08);opacity:0.8} }
@keyframes spin { from{transform:rotate(0deg)} to{transform:rotate(360deg)} }

.hero .container {
  position: relative; z-index: 2;
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center;
}
.badge {
  display: inline-block;
  background: rgba(245,130,13,0.15); color: var(--orange);
  border: 1px solid rgba(245,130,13,0.3);
  font-size: 0.75rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase;
  padding: 5px 14px; border-radius: 100px; margin-bottom: 20px;
}
.hero-title {
  font-size: clamp(2.4rem, 5vw, 4rem);
  font-weight: 800; color: var(--white);
  line-height: 1.1; margin-bottom: 20px;
}
.hero-title .accent { color: var(--orange); }
.hero-sub {
  font-size: 1.15rem; color: rgba(255,255,255,0.7);
  margin-bottom: 36px; max-width: 480px;
}
.hero-btns { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-visual {
  display: flex; justify-content: center; align-items: center;
}
.hero-img {
  width: 100%; max-width: 480px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  animation: float 6s ease-in-out infinite;
}
@keyframes float { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-12px)} }

/* ── BUTTONS ── */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 14px 28px; border-radius: var(--radius);
  font-family: 'Exo 2', sans-serif; font-size: 0.95rem; font-weight: 700;
  letter-spacing: 0.02em; cursor: pointer; border: none;
  transition: var(--transition); white-space: nowrap;
}
.btn-primary {
  background: var(--orange); color: var(--white);
  box-shadow: 0 4px 20px rgba(245,130,13,0.35);
}
.btn-primary:hover {
  background: var(--orange-light); transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(245,130,13,0.45);
}
.btn-ghost {
  background: rgba(255,255,255,0.08); color: var(--white);
  border: 1px solid rgba(255,255,255,0.2);
}
.btn-ghost:hover { background: rgba(255,255,255,0.14); transform: translateY(-2px); }
.btn-full { width: 100%; }

/* ── STATS ── */
.stats {
  background: var(--orange);
  padding: 32px 0;
}
.stats-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 24px; text-align: center;
}
.stat-num {
  display: block; font-family: 'Exo 2', sans-serif;
  font-size: 2rem; font-weight: 800; color: var(--white);
}
.stat-lbl {
  display: block; font-size: 0.8rem; color: rgba(255,255,255,0.8);
  text-transform: uppercase; letter-spacing: 0.08em; margin-top: 4px;
}

/* ── HOW IT WORKS ── */
.how { padding: 100px 0; background: var(--white); }
.section-header { text-align: center; margin-bottom: 64px; }
.section-header h2 {
  font-size: clamp(1.8rem, 3vw, 2.8rem); font-weight: 800;
  color: var(--navy); margin-bottom: 12px;
}
.section-header p { font-size: 1.05rem; color: var(--text-light); max-width: 560px; margin: 0 auto; }
.section-header.light h2 { color: var(--white); }
.section-header.light p { color: rgba(255,255,255,0.7); }

.how-grid {
  display: grid; grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: 16px; align-items: center;
}
.how-arrow {
  font-size: 2rem; color: var(--orange); font-weight: 700;
  text-align: center;
}
.how-card {
  background: var(--gray); border-radius: var(--radius-lg);
  padding: 36px 28px; position: relative; overflow: hidden;
  transition: var(--transition);
}
.how-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.how-icon { font-size: 2.5rem; margin-bottom: 12px; }
.how-num {
  position: absolute; top: 16px; right: 20px;
  font-family: 'Syne', sans-serif; font-size: 3rem; font-weight: 800;
  color: rgba(27,42,74,0.06); line-height: 1;
}
.how-card h3 { font-size: 1.15rem; font-weight: 700; color: var(--navy); margin-bottom: 10px; }
.how-card p { font-size: 0.9rem; color: var(--text-light); line-height: 1.6; }

/* ── PERFORMANCE ── */
.performance {
  padding: 100px 0;
  background: linear-gradient(135deg, var(--navy) 0%, #0D1B35 100%);
}
.perf-grid { display: grid; grid-template-columns: 1fr auto; gap: 48px; align-items: start; }
.perf-table-wrap { overflow-x: auto; }
.perf-table {
  width: 100%; border-collapse: collapse;
  background: rgba(255,255,255,0.05); border-radius: var(--radius);
  overflow: hidden;
}
.perf-table th {
  background: rgba(245,130,13,0.2); color: var(--orange);
  font-family: 'Exo 2', sans-serif; font-size: 0.8rem;
  text-transform: uppercase; letter-spacing: 0.08em;
  padding: 12px 16px; text-align: left;
}
.perf-table td {
  padding: 12px 16px; color: rgba(255,255,255,0.8);
  font-size: 0.9rem; border-bottom: 1px solid rgba(255,255,255,0.06);
}
.perf-table tr.peak td { color: var(--white); background: rgba(245,130,13,0.1); }
.perf-table tr.peak td strong { color: var(--orange); font-size: 1rem; }
.perf-note { color: rgba(255,255,255,0.5); font-size: 0.8rem; margin-top: 12px; font-style: italic; }

.perf-highlight {
  background: rgba(255,255,255,0.05); border: 1px solid rgba(245,130,13,0.3);
  border-radius: var(--radius-lg); padding: 36px 32px;
  text-align: center; min-width: 220px;
}
.perf-big {
  font-family: 'Exo 2', sans-serif; font-size: 3.5rem; font-weight: 800;
  color: var(--orange); line-height: 1;
}
.perf-big-sub { color: rgba(255,255,255,0.6); font-size: 0.85rem; margin-top: 8px; line-height: 1.5; }
.perf-divider { border-top: 1px solid rgba(255,255,255,0.1); margin: 24px 0; }
.perf-fact { color: rgba(255,255,255,0.7); font-size: 0.85rem; line-height: 1.5; }

/* ── PHYSICS COMPARISON ── */
.physics {
  padding: 100px 0;
  background: linear-gradient(135deg, #0D1B35 0%, var(--navy) 100%);
}
.phys-intro {
  max-width: 760px; margin: 0 auto 40px;
  text-align: center;
}
.phys-intro p {
  font-size: 1.05rem; color: rgba(255,255,255,0.75);
  line-height: 1.7;
}
.phys-table-wrap { overflow-x: auto; }
.phys-table {
  width: 100%; border-collapse: collapse;
  border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.phys-table th {
  background: rgba(255,255,255,0.08);
  color: rgba(255,255,255,0.7);
  font-family: 'Exo 2', sans-serif; font-size: 0.8rem;
  text-transform: uppercase; letter-spacing: 0.08em;
  padding: 14px 20px; text-align: left;
}
.phys-col-diode { background: rgba(245,130,13,0.2) !important; color: var(--white) !important; }
.phys-table th.phys-col-diode { color: var(--orange) !important; }

.phys-table td {
  padding: 16px 20px; font-size: 0.88rem;
  color: rgba(255,255,255,0.7);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  line-height: 1.6;
}
.phys-table td.phys-col-diode {
  background: rgba(245,130,13,0.08);
  color: var(--white);
}
.phys-table td strong { color: var(--white); font-size: 1rem; }
.phys-table td.phys-col-diode strong { color: var(--orange); font-size: 1.05rem; }
.phys-table tr:last-child td { border-bottom: none; }

.phys-pct {
  display: inline-block; margin-left: 6px;
  font-size: 0.75rem; font-weight: 700;
  padding: 2px 8px; border-radius: 100px;
  background: rgba(255,255,255,0.1); color: rgba(255,255,255,0.6);
}
.phys-win { background: rgba(46,204,113,0.2); color: #2ecc71; }
.phys-lose { background: rgba(231,76,60,0.2); color: #e74c3c; }

.phys-note {
  color: rgba(255,255,255,0.4); font-size: 0.8rem;
  text-align: center; font-style: italic;
  max-width: 720px; margin: 24px auto 0;
}

/* ── EFFICIENCY COMPARISON ── */
.efficiency { padding: 100px 0; background: var(--white); }

.effic-wrap { display: flex; flex-direction: column; gap: 32px; }

.effic-intro p {
  font-size: 1.05rem; color: var(--text-light);
  max-width: 760px; margin: 0 auto; text-align: center; line-height: 1.7;
}

.effic-table-wrap { overflow-x: auto; }
.effic-table {
  width: 100%; border-collapse: collapse;
  border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow);
}
.effic-table th {
  background: var(--navy); color: var(--white);
  font-family: 'Exo 2', sans-serif; font-size: 0.82rem;
  text-transform: uppercase; letter-spacing: 0.08em;
  padding: 14px 20px; text-align: left;
}
.effic-table th.passoheat-col {
  background: var(--orange); color: var(--white);
}
.effic-table td {
  padding: 16px 20px; font-size: 0.95rem;
  border-bottom: 1px solid rgba(27,42,74,0.08);
  color: var(--text);
}
.effic-table td.passoheat-col {
  background: rgba(245,130,13,0.06);
  font-weight: 600; color: var(--navy);
}
.effic-table tr:last-child td { border-bottom: none; }
.effic-table tr:hover td { background: var(--gray); }
.effic-table tr:hover td.passoheat-col { background: rgba(245,130,13,0.10); }

.effic-pct {
  display: inline-block; margin-left: 8px;
  font-size: 0.78rem; font-weight: 700;
  padding: 2px 8px; border-radius: 100px;
  background: rgba(27,42,74,0.08); color: var(--text-light);
}
.effic-pct.effic-win { background: rgba(46,204,113,0.15); color: #1a8a4a; }
.effic-pct.effic-lose { background: rgba(231,76,60,0.12); color: #c0392b; }

.effic-cards {
  display: grid; grid-template-columns: repeat(3,1fr); gap: 20px;
}
.effic-card {
  border-radius: var(--radius-lg); padding: 28px 24px; text-align: center;
}
.effic-card--win { background: linear-gradient(135deg, var(--orange), #E8710A); color: var(--white); }
.effic-card--mid { background: var(--navy); color: var(--white); }
.effic-card--info { background: var(--gray); color: var(--navy); }
.effic-card-num {
  font-family: 'Exo 2', sans-serif; font-size: 2.8rem; font-weight: 800;
  line-height: 1; margin-bottom: 10px;
}
.effic-card-lbl { font-size: 0.88rem; line-height: 1.5; opacity: 0.9; }

.effic-note {
  font-size: 0.8rem; color: var(--gray-dark);
  text-align: center; font-style: italic; max-width: 720px; margin: 0 auto;
}

/* ── FEATURES ── */
.features { padding: 100px 0; background: var(--gray); }
.feat-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.feat-card {
  background: var(--white); border-radius: var(--radius-lg);
  padding: 32px 28px; transition: var(--transition);
  border: 1px solid transparent;
}
.feat-card:hover {
  transform: translateY(-4px); box-shadow: var(--shadow);
  border-color: rgba(245,130,13,0.2);
}
.feat-icon { font-size: 2rem; margin-bottom: 14px; }
.feat-card h3 { font-size: 1rem; font-weight: 700; color: var(--navy); margin-bottom: 8px; }
.feat-card p { font-size: 0.88rem; color: var(--text-light); line-height: 1.65; }

/* ── WAITLIST ── */
.waitlist {
  padding: 100px 0;
  background: linear-gradient(135deg, #F5820D 0%, #E8710A 100%);
}
.waitlist-inner {
  display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center;
}
.waitlist-text h2 {
  font-size: clamp(1.8rem, 3vw, 2.6rem); font-weight: 800;
  color: var(--white); margin-bottom: 16px;
}
.waitlist-text p { color: rgba(255,255,255,0.85); font-size: 1rem; margin-bottom: 28px; }
.waitlist-perks { list-style: none; }
.waitlist-perks li {
  color: rgba(255,255,255,0.9); font-size: 0.95rem;
  padding: 6px 0; font-weight: 500;
}

.waitlist-form-wrap {
  background: var(--white); border-radius: var(--radius-lg);
  padding: 40px; box-shadow: var(--shadow-lg);
}
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block; font-size: 0.85rem; font-weight: 600;
  color: var(--navy); margin-bottom: 6px;
}
.form-group input {
  width: 100%; padding: 12px 16px;
  border: 1.5px solid #E0E6EF; border-radius: var(--radius);
  font-family: 'Nunito Sans', sans-serif; font-size: 0.95rem; color: var(--text);
  transition: var(--transition); background: var(--white);
}
.form-group input:focus {
  outline: none; border-color: var(--orange);
  box-shadow: 0 0 0 3px rgba(245,130,13,0.12);
}
.form-check {
  display: flex; gap: 12px; align-items: flex-start; margin-bottom: 24px;
}
.form-check input[type="checkbox"] {
  width: 18px; height: 18px; margin-top: 2px; flex-shrink: 0;
  accent-color: var(--orange); cursor: pointer;
}
.form-check label { font-size: 0.82rem; color: var(--text-light); cursor: pointer; }

.form-msg {
  margin-top: 16px; padding: 12px 16px; border-radius: var(--radius);
  font-size: 0.9rem; font-weight: 500; display: none;
}
.form-msg.success { background: rgba(46,204,113,0.1); color: #1a8a4a; border: 1px solid rgba(46,204,113,0.3); }
.form-msg.error { background: rgba(231,76,60,0.1); color: #c0392b; border: 1px solid rgba(231,76,60,0.3); }
.form-privacy { font-size: 0.75rem; color: var(--gray-dark); margin-top: 12px; text-align: center; }

/* ── FOOTER ── */
.footer { background: var(--navy); padding: 48px 0 24px; }
.footer-inner {
  display: flex; justify-content: space-between; align-items: flex-start;
  margin-bottom: 32px;
}
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); padding-top: 20px; }
.footer-bottom p { color: rgba(255,255,255,0.3); font-size: 0.78rem; text-align: center; }

/* ── RESPONSIVE ── */
@media (max-width: 900px) {
  .hero .container { grid-template-columns: 1fr; }
  .hero-visual { 
    display: flex;
    justify-content: center;
    margin-top: 32px;
  }
  .hero-img {
    max-width: 300px;
    width: 100%;
  }
  .how-grid { grid-template-columns: 1fr; }
  .how-arrow { transform: rotate(90deg); text-align: center; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .feat-grid { grid-template-columns: repeat(2, 1fr); }
  .perf-grid { grid-template-columns: 1fr; }
  .waitlist-inner { grid-template-columns: 1fr; gap: 40px; }
  .footer-inner { flex-direction: column; gap: 24px; }
}

@media (max-width: 600px) {
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }
  .feat-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-title { font-size: 2.2rem; }
  .waitlist-form-wrap { padding: 28px 20px; }
}

/* ── ANIMATIONS ── */
.fade-in {
  opacity: 0; transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible { opacity: 1; transform: translateY(0); }