/* ============================================
   SALES SYMPHONY — BASE CSS + DESIGN TOKENS
   Brand: Bold, energetic, professional
   Palette: Deep navy + electric cyan + white
   ============================================ */

/* === DESIGN TOKENS === */
:root {
  /* Type Scale — Fluid */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);
  --text-hero: clamp(3rem, 0.5rem + 7vw, 8rem);

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

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: 300ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;

  /* Fonts */
  --font-display: 'Clash Display', 'Helvetica Neue', sans-serif;
  --font-body: 'Satoshi', 'Inter', sans-serif;
}

/* === LIGHT MODE PALETTE === */
:root,
[data-theme='light'] {
  --color-bg: #f8f9fc;
  --color-surface: #ffffff;
  --color-surface-2: #f0f3f9;
  --color-surface-offset: #e8ecf5;
  --color-surface-dynamic: #dde3ef;
  --color-divider: #d0d6e8;
  --color-border: #c4ccde;

  --color-text: #0d1220;
  --color-text-muted: #4a5370;
  --color-text-faint: #8c95b2;
  --color-text-inverse: #ffffff;

  /* Navy — primary brand */
  --color-navy: #0f1f4b;
  --color-navy-hover: #162a63;
  --color-navy-deep: #0a1530;

  /* Cyan — accent */
  --color-primary: #0095c8;
  --color-primary-hover: #0079a8;
  --color-primary-active: #005d84;
  --color-primary-highlight: #d0edf8;
  --color-primary-glow: rgba(0, 149, 200, 0.15);

  /* Neutral support */
  --color-success: #1a7a4a;
  --color-warning: #c07a10;
  --color-error: #c0254e;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(15, 31, 75, 0.08);
  --shadow-md: 0 4px 16px rgba(15, 31, 75, 0.10);
  --shadow-lg: 0 16px 48px rgba(15, 31, 75, 0.14);
  --shadow-glow: 0 0 40px rgba(0, 149, 200, 0.20);
}

/* === DARK MODE PALETTE === */
[data-theme='dark'] {
  --color-bg: #090e1c;
  --color-surface: #0f1629;
  --color-surface-2: #141c33;
  --color-surface-offset: #192040;
  --color-surface-dynamic: #1f284f;
  --color-divider: #242d58;
  --color-border: #2e3a6e;

  --color-text: #e2e6f3;
  --color-text-muted: #8490b8;
  --color-text-faint: #4f5b85;
  --color-text-inverse: #0f1629;

  --color-navy: #1a2e6e;
  --color-navy-hover: #1f3682;
  --color-navy-deep: #0a1530;

  --color-primary: #2db4e0;
  --color-primary-hover: #50c4eb;
  --color-primary-active: #7dd4f2;
  --color-primary-highlight: #0f2540;
  --color-primary-glow: rgba(45, 180, 224, 0.20);

  --color-success: #3cb974;
  --color-warning: #e09a30;
  --color-error: #e05070;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 60px rgba(45, 180, 224, 0.25);
}

/* === SYSTEM PREFERENCE FALLBACK === */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #090e1c;
    --color-surface: #0f1629;
    --color-surface-2: #141c33;
    --color-surface-offset: #192040;
    --color-surface-dynamic: #1f284f;
    --color-divider: #242d58;
    --color-border: #2e3a6e;
    --color-text: #e2e6f3;
    --color-text-muted: #8490b8;
    --color-text-faint: #4f5b85;
    --color-text-inverse: #0f1629;
    --color-navy: #1a2e6e;
    --color-navy-hover: #1f3682;
    --color-navy-deep: #0a1530;
    --color-primary: #2db4e0;
    --color-primary-hover: #50c4eb;
    --color-primary-active: #7dd4f2;
    --color-primary-highlight: #0f2540;
    --color-primary-glow: rgba(45, 180, 224, 0.20);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.25);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.35);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 60px rgba(45, 180, 224, 0.25);
  }
}

/* === BASE RESET & TYPOGRAPHY === */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: var(--space-20);
}

body {
  min-height: 100dvh;
  line-height: 1.6;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color 0.3s ease, color 0.3s ease;
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

ul[role='list'], ol[role='list'] { list-style: none; }

input, button, textarea, select { font: inherit; color: inherit; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  text-wrap: balance;
  line-height: 1.1;
  font-weight: 700;
}

p, li, figcaption {
  text-wrap: pretty;
  max-width: 72ch;
}

::selection {
  background: var(--color-primary-glow);
  color: var(--color-text);
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

button { cursor: pointer; background: none; border: none; }

a, button, [role='button'], input, textarea, select {
  transition: color var(--transition-interactive),
              background var(--transition-interactive),
              border-color var(--transition-interactive),
              box-shadow var(--transition-interactive);
}

.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border-width: 0;
}

/* === LAYOUT UTILITIES === */
.container {
  width: 100%;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: clamp(var(--space-6), 5vw, var(--space-16));
}

.container--narrow {
  max-width: var(--content-default);
}

.section {
  padding-block: clamp(var(--space-16), 8vw, var(--space-32));
}

/* === COMPONENT: BUTTONS === */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-8);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  text-decoration: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-primary);
  color: #ffffff;
  border: 2px solid var(--color-primary);
}
.btn-primary:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-ghost {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}
.btn-ghost:hover {
  background: var(--color-primary);
  color: #ffffff;
  transform: translateY(-1px);
}

.btn-white {
  background: #ffffff;
  color: var(--color-navy);
  border: 2px solid #ffffff;
}
.btn-white:hover {
  background: transparent;
  color: #ffffff;
  transform: translateY(-1px);
}

/* === COMPONENT: NAVIGATION === */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: oklch(from var(--color-bg) l c h / 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow 0.3s ease;
}

.nav--scrolled { box-shadow: var(--shadow-md); }

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 82px;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: clamp(var(--space-6), 5vw, var(--space-16));
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  list-style: none;
}

.nav__links a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  letter-spacing: 0.02em;
}
.nav__links a:hover { color: var(--color-primary); }
.nav__links a.active { color: var(--color-text); font-weight: 600; }

.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.nav__mobile-toggle {
  display: none;
  padding: var(--space-2);
  color: var(--color-text);
}

.nav__mobile-menu {
  display: none;
  flex-direction: column;
  padding: var(--space-6);
  border-top: 1px solid var(--color-border);
  gap: var(--space-4);
  background: var(--color-surface);
}

.nav__mobile-menu a {
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-border);
}

.nav__mobile-menu.open { display: flex; }

.theme-toggle {
  width: 36px; height: 36px;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  display: flex; align-items: center; justify-content: center;
}
.theme-toggle:hover { color: var(--color-primary); background: var(--color-surface-2); }

@media (max-width: 768px) {
  .nav__links { display: none; }
  .nav__actions .btn { display: none; }
  .nav__mobile-toggle { display: flex; }
}

/* === COMPONENT: FOOTER === */
.footer {
  background: var(--color-navy);
  color: rgba(255,255,255,0.75);
  padding-block: clamp(var(--space-16), 6vw, var(--space-24));
}

[data-theme='dark'] .footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-12);
}

.footer__brand p {
  font-size: var(--text-sm);
  line-height: 1.7;
  margin-top: var(--space-4);
  max-width: 36ch;
}

.footer__col h4 {
  font-size: var(--text-sm);
  font-weight: 700;
  color: #ffffff;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--space-6);
  font-family: var(--font-body);
}

.footer__col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer__col ul a {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.65);
  text-decoration: none;
}
.footer__col ul a:hover { color: var(--color-primary); }

.footer__bottom {
  margin-top: var(--space-12);
  padding-top: var(--space-6);
  border-top: 1px solid rgba(255,255,255,0.12);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.45);
}

[data-theme='dark'] .footer__bottom { border-color: var(--color-border); }

@media (max-width: 900px) {
  .footer__grid { grid-template-columns: 1fr 1fr; gap: var(--space-10); }
}
@media (max-width: 580px) {
  .footer__grid { grid-template-columns: 1fr; }
  .footer__bottom { flex-direction: column; gap: var(--space-3); text-align: center; }
}

/* === SECTION: DIVIDER / ACCENT STRIP === */
.accent-strip {
  height: 4px;
  background: linear-gradient(90deg, var(--color-navy), var(--color-primary), var(--color-navy));
}

/* === COMPONENT: SECTION LABEL === */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}

.section-label::before {
  content: '';
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
}

/* === COMPONENT: CARD === */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth), border-color var(--transition-smooth);
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

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

@keyframes slideInRight {
  from { opacity: 0; transform: translateX(32px); }
  to   { opacity: 1; transform: translateX(0); }
}

@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 0 20px rgba(0,149,200,0.2); }
  50%       { box-shadow: 0 0 40px rgba(0,149,200,0.4); }
}

.animate-fade-up {
  animation: fadeInUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.animate-delay-1 { animation-delay: 0.1s; }
.animate-delay-2 { animation-delay: 0.2s; }
.animate-delay-3 { animation-delay: 0.3s; }
.animate-delay-4 { animation-delay: 0.4s; }