/* ═══════════════════════════════════════════════════
   KAIROS — Design System
   Dark Obsidian × Amber Gold
   "The Decisive Moment, Perfected"
═══════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,600;0,700;1,400;1,600&family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;1,9..40,300&display=swap');

/* ── Variables ─────────────────────────────────── */
:root {
  /* Core Palette */
  --obsidian:       #090909;
  --obsidian-2:     #0f0f10;
  --obsidian-3:     #161618;
  --obsidian-4:     #1e1e22;
  --obsidian-5:     #28282e;
  --surface:        #1c1c20;
  --surface-2:      #232328;
  --surface-3:      #2a2a30;

  --amber:          #c9973a;
  --amber-bright:   #e8b04b;
  --amber-glow:     rgba(201, 151, 58, 0.18);
  --amber-glow-sm:  rgba(201, 151, 58, 0.08);
  --amber-dim:      #8a6520;

  --white:          #ffffff;
  --white-90:       rgba(255,255,255,0.90);
  --white-70:       rgba(255,255,255,0.70);
  --white-50:       rgba(255,255,255,0.50);
  --white-30:       rgba(255,255,255,0.30);
  --white-15:       rgba(255,255,255,0.15);
  --white-08:       rgba(255,255,255,0.08);
  --white-04:       rgba(255,255,255,0.04);

  --border:         rgba(255,255,255,0.10);
  --border-subtle:  rgba(255,255,255,0.06);
  --border-amber:   rgba(201,151,58,0.35);

  --success:        #4ade80;
  --error:          #f87171;
  --warning:        #fbbf24;

  /* Typography */
  --font-display: 'Playfair Display', Georgia, serif;
  --font-body:    'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Scale */
  --text-xs:   0.6875rem;  /* 11px */
  --text-sm:   0.8125rem;  /* 13px */
  --text-base: 0.9375rem;  /* 15px */
  --text-md:   1.0625rem;  /* 17px */
  --text-lg:   1.25rem;    /* 20px */
  --text-xl:   1.5625rem;  /* 25px */
  --text-2xl:  2rem;       /* 32px */
  --text-3xl:  2.75rem;    /* 44px */
  --text-4xl:  3.75rem;    /* 60px */
  --text-5xl:  5rem;       /* 80px */
  --text-6xl:  6.5rem;     /* 104px */

  /* Spacing */
  --sp-1: 0.25rem;
  --sp-2: 0.5rem;
  --sp-3: 0.75rem;
  --sp-4: 1rem;
  --sp-5: 1.25rem;
  --sp-6: 1.5rem;
  --sp-8: 2rem;
  --sp-10: 2.5rem;
  --sp-12: 3rem;
  --sp-16: 4rem;
  --sp-20: 5rem;
  --sp-24: 6rem;
  --sp-32: 8rem;

  /* Radius */
  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 16px;
  --r-xl: 24px;
  --r-2xl: 32px;
  --r-full: 9999px;

  /* Transitions */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --ease-spring: cubic-bezier(0.175, 0.885, 0.32, 1.275);
  --t-fast: 120ms;
  --t-base: 220ms;
  --t-slow: 400ms;

  /* Shadows */
  --shadow-amber: 0 0 60px rgba(201,151,58,0.15), 0 0 120px rgba(201,151,58,0.08);
  --shadow-card: 0 1px 0 rgba(255,255,255,0.06) inset, 0 -1px 0 rgba(0,0,0,0.4) inset;
  --shadow-glow-sm: 0 0 20px rgba(201,151,58,0.3);
  --shadow-lift: 0 20px 60px rgba(0,0,0,0.6), 0 4px 16px rgba(0,0,0,0.4);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.65;
  color: var(--white-90);
  background: var(--obsidian);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* ── Typography ─────────────────────────────────── */
h1,h2,h3,h4,h5,h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.15;
  color: var(--white);
}

p { color: var(--white-70); line-height: 1.75; }

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

ul,ol { list-style: none; }

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

button { font-family: var(--font-body); cursor: pointer; border: none; background: none; }

input, textarea, select {
  font-family: var(--font-body);
  background: transparent;
  border: none;
  outline: none;
  color: var(--white);
}

/* ── Layout ─────────────────────────────────────── */
.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 var(--sp-6);
}

.container--narrow {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 var(--sp-6);
}

/* ── NAVBAR ─────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 999;
  height: 64px;
  display: flex;
  align-items: center;
  background: rgba(9,9,9,0.7);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border-subtle);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 var(--sp-6);
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: 0.01em;
}

.nav__logo-mark {
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  position: relative;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--sp-8);
}

.nav__links a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--white-70);
  letter-spacing: 0.02em;
  transition: color var(--t-base) var(--ease);
}

.nav__links a:hover { color: var(--white); }

.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

/* ── BUTTONS ─────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: 0 var(--sp-6);
  height: 42px;
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.02em;
  border-radius: var(--r-full);
  cursor: pointer;
  transition: all var(--t-base) var(--ease);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn--amber {
  background: var(--amber);
  color: var(--obsidian);
  border: 1px solid var(--amber-bright);
}
.btn--amber:hover {
  background: var(--amber-bright);
  box-shadow: var(--shadow-glow-sm);
  transform: translateY(-1px);
}

.btn--ghost {
  background: var(--white-08);
  color: var(--white-90);
  border: 1px solid var(--border);
}
.btn--ghost:hover {
  background: var(--white-15);
  border-color: var(--white-30);
}

.btn--outline-amber {
  background: transparent;
  color: var(--amber);
  border: 1px solid var(--border-amber);
}
.btn--outline-amber:hover {
  background: var(--amber-glow);
  box-shadow: var(--shadow-glow-sm);
}

.btn--lg {
  height: 52px;
  padding: 0 var(--sp-8);
  font-size: var(--text-base);
}

.btn--xl {
  height: 60px;
  padding: 0 var(--sp-10);
  font-size: var(--text-md);
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none !important;
}

/* ── FORM ELEMENTS ──────────────────────────────── */
.field {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  margin-bottom: var(--sp-5);
}

.field label {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--white-50);
}

.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 0 var(--sp-4);
  height: 48px;
  background: var(--obsidian-4);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  font-size: var(--text-base);
  color: var(--white);
  transition: border-color var(--t-base) var(--ease), box-shadow var(--t-base) var(--ease);
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  border-color: var(--amber);
  box-shadow: 0 0 0 3px var(--amber-glow);
}

.field input::placeholder { color: var(--white-30); }

/* ── CARDS ──────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  box-shadow: var(--shadow-card);
}

.card--glow {
  border-color: var(--border-amber);
  box-shadow: var(--shadow-card), 0 0 40px rgba(201,151,58,0.06);
}

/* ── BADGE ──────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-1) var(--sp-3);
  background: var(--amber-glow);
  border: 1px solid var(--border-amber);
  border-radius: var(--r-full);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--amber-bright);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.badge__dot {
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--amber-bright);
  animation: pulse 2s infinite;
}

/* ── DIVIDER ─────────────────────────────────────── */
.divider {
  width: 100%;
  height: 1px;
  background: var(--border-subtle);
}

/* ── UTILITY ─────────────────────────────────────── */
.text-amber    { color: var(--amber-bright); }
.text-muted    { color: var(--white-50); }
.text-center   { text-align: center; }
.italic        { font-style: italic; }

.flex          { display: flex; }
.flex-col      { flex-direction: column; }
.items-center  { align-items: center; }
.justify-center { justify-content: center; }
.gap-2         { gap: var(--sp-2); }
.gap-4         { gap: var(--sp-4); }
.gap-6         { gap: var(--sp-6); }

/* ── ANIMATIONS ─────────────────────────────────── */
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.4; }
}

@keyframes marquee {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-12px); }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes glow-pulse {
  0%, 100% { opacity: 0.6; transform: scale(1); }
  50%       { opacity: 1; transform: scale(1.05); }
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

@keyframes shimmer {
  0%   { background-position: -200% center; }
  100% { background-position: 200% center; }
}

/* ── SCROLLBAR ──────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--obsidian); }
::-webkit-scrollbar-thumb { background: var(--obsidian-5); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--surface-3); }

/* ── SELECTION ──────────────────────────────────── */
::selection { background: var(--amber-glow); color: var(--amber-bright); }

/* ── FOCUS ──────────────────────────────────────── */
:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}

/* ── HAMBURGER & MOBILE NAV ──────────────────────── */
.nav__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav__hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--white-70);
  border-radius: 2px;
  transition: transform 0.25s var(--ease), opacity 0.2s;
}
.nav__hamburger--open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__hamburger--open span:nth-child(2) { opacity: 0; }
.nav__hamburger--open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav__mobile {
  display: none;
  flex-direction: column;
  gap: var(--sp-2);
  padding: var(--sp-4) var(--sp-6) var(--sp-6);
  border-top: 1px solid var(--border-subtle);
}
.nav__mobile a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--white-70);
  padding: var(--sp-3) 0;
  border-bottom: 1px solid rgba(255,255,255,0.05);
  text-decoration: none;
  transition: color 0.15s;
}
.nav__mobile a:hover { color: var(--white); }
.nav__mobile--open { display: flex; }

/* ── RESPONSIVE ─────────────────────────────────── */
@media (max-width: 768px) {
  :root {
    --text-4xl: 2.75rem;
    --text-5xl: 3.5rem;
  }
  .container { padding: 0 var(--sp-4); }
  .nav__links { display: none; }
  .nav__download-btn { display: none; }
  .nav__hamburger { display: flex; }
}

@media (max-width: 480px) {
  :root {
    --text-4xl: 2.25rem;
    --text-5xl: 2.75rem;
  }
}