/* ==========================================================================
   StoreHub — Base
   Design tokens, reset, buttons, navbar. Loaded on every page.
   ========================================================================== */

/* ---------------------------------- */
/* 1. Design Tokens                   */
/* ---------------------------------- */
:root {
  /* Colors */
  --color-primary: #2563EB;
  --color-primary-dark: #1D4ED8;
  --color-primary-light: #3B82F6;
  --color-primary-50: #EFF6FF;
  --color-accent: #F97316;
  --color-accent-dark: #EA580C;
  --color-bg: #F8FAFC;
  --color-bg-alt: #F1F5F9;
  --color-card: #FFFFFF;
  --color-text: #111827;
  --color-text-secondary: #6B7280;
  --color-border: #E5E7EB;
  --color-success: #16A34A;
  --color-star: #F59E0B;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #2563EB 0%, #1D4ED8 60%, #1E3A8A 100%);
  --gradient-accent: linear-gradient(135deg, #F97316 0%, #EA580C 100%);
  --gradient-hero-bg: radial-gradient(circle at 80% 20%, rgba(37,99,235,0.08), transparent 55%),
                      radial-gradient(circle at 10% 80%, rgba(249,115,22,0.06), transparent 45%);
  --gradient-card-border: linear-gradient(135deg, rgba(37,99,235,0.5), rgba(249,115,22,0.4));
  --gradient-footer-bg: radial-gradient(circle at 20% 0%, rgba(37,99,235,0.25), transparent 55%),
                      radial-gradient(circle at 90% 100%, rgba(249,115,22,0.12), transparent 45%);

  /* Glass */
  --glass-bg: rgba(255,255,255,0.55);
  --glass-bg-strong: rgba(255,255,255,0.75);
  --glass-border: rgba(255,255,255,0.6);
  --glass-blur: blur(18px);
  --glass-dark-bg: rgba(15,23,42,0.45);
  --glass-dark-border: rgba(255,255,255,0.08);

  /* Typography */
  --font-display: 'Poppins', 'Inter', sans-serif;
  --font-body: 'Inter', sans-serif;

  /* Radii */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(17, 24, 39, 0.05);
  --shadow-md: 0 8px 24px rgba(17, 24, 39, 0.08);
  --shadow-lg: 0 20px 48px rgba(17, 24, 39, 0.12);
  --shadow-primary: 0 12px 28px rgba(37, 99, 235, 0.28);
  --shadow-accent: 0 12px 28px rgba(249, 115, 22, 0.28);

  /* Spacing */
  --container-width: 1280px;
  --space-section: 112px;
  --space-section-mobile: 64px;

  /* Motion */
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: 0.2s var(--ease);
  --transition-med: 0.4s var(--ease);
  --transition-slow: 0.7s var(--ease);

  /* Surfaces (theme-aware: plain white/gray in light, dark slate in dark) */
  --color-surface: #FFFFFF;
  --color-surface-alt: #F1F5F9;
  --color-placeholder: #9CA3AF;
  --color-navbar-bg: rgba(255,255,255,0.7);
  --color-navbar-bg-scrolled: rgba(255,255,255,0.92);
}

/* ---------------------------------- */
/* 1b. Dark Theme                     */
/* ---------------------------------- */
:root[data-theme="dark"] {
  --color-primary: #3B82F6;
  --color-primary-dark: #2563EB;
  --color-primary-light: #60A5FA;
  --color-primary-50: rgba(59,130,246,0.14);
  --color-accent: #FB923C;
  --color-accent-dark: #F97316;
  --color-bg: #0B1220;
  --color-bg-alt: #111A2C;
  --color-card: #16213A;
  --color-text: #E5E9F0;
  --color-text-secondary: #94A3B8;
  --color-border: rgba(255,255,255,0.10);
  --color-success: #22C55E;
  --color-star: #FBBF24;

  --color-surface: #16213A;
  --color-surface-alt: #1B2740;
  --color-placeholder: #64748B;
  --color-navbar-bg: rgba(15,23,42,0.7);
  --color-navbar-bg-scrolled: rgba(15,23,42,0.9);

  --gradient-hero-bg: radial-gradient(circle at 80% 20%, rgba(59,130,246,0.16), transparent 55%),
                      radial-gradient(circle at 10% 80%, rgba(251,146,60,0.10), transparent 45%);
  --gradient-footer-bg: radial-gradient(circle at 20% 0%, rgba(59,130,246,0.30), transparent 55%),
                      radial-gradient(circle at 90% 100%, rgba(251,146,60,0.14), transparent 45%);

  --glass-bg: rgba(22,33,58,0.55);
  --glass-bg-strong: rgba(22,33,58,0.75);
  --glass-border: rgba(255,255,255,0.08);

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.35);
  --shadow-md: 0 8px 24px rgba(0,0,0,0.45);
  --shadow-lg: 0 20px 48px rgba(0,0,0,0.55);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-primary: #3B82F6;
    --color-primary-dark: #2563EB;
    --color-primary-light: #60A5FA;
    --color-primary-50: rgba(59,130,246,0.14);
    --color-accent: #FB923C;
    --color-accent-dark: #F97316;
    --color-bg: #0B1220;
    --color-bg-alt: #111A2C;
    --color-card: #16213A;
    --color-text: #E5E9F0;
    --color-text-secondary: #94A3B8;
    --color-border: rgba(255,255,255,0.10);
    --color-success: #22C55E;
    --color-star: #FBBF24;

    --color-surface: #16213A;
    --color-surface-alt: #1B2740;
    --color-placeholder: #64748B;
    --color-navbar-bg: rgba(15,23,42,0.7);
    --color-navbar-bg-scrolled: rgba(15,23,42,0.9);

    --gradient-hero-bg: radial-gradient(circle at 80% 20%, rgba(59,130,246,0.16), transparent 55%),
                        radial-gradient(circle at 10% 80%, rgba(251,146,60,0.10), transparent 45%);
    --gradient-footer-bg: radial-gradient(circle at 20% 0%, rgba(59,130,246,0.30), transparent 55%),
                        radial-gradient(circle at 90% 100%, rgba(251,146,60,0.14), transparent 45%);

    --glass-bg: rgba(22,33,58,0.55);
    --glass-bg-strong: rgba(22,33,58,0.75);
    --glass-border: rgba(255,255,255,0.08);

    --shadow-sm: 0 1px 2px rgba(0,0,0,0.35);
    --shadow-md: 0 8px 24px rgba(0,0,0,0.45);
    --shadow-lg: 0 20px 48px rgba(0,0,0,0.55);
  }
}

/* ---------------------------------- */
/* 2. Reset                           */
/* ---------------------------------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  position: relative;
  font-family: var(--font-body);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    radial-gradient(circle at 12% 8%, rgba(37,99,235,0.10), transparent 45%),
    radial-gradient(circle at 88% 92%, rgba(249,115,22,0.07), transparent 45%);
}

body > * { position: relative; z-index: 1; }

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, select { font-family: inherit; font-size: inherit; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: 4px;
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section { padding: var(--space-section) 0; position: relative; }
.section-alt {
  background-color: var(--color-bg-alt);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
}

.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 56px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-primary);
  background: var(--color-primary-50);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  margin-bottom: 18px;
}

.section-head h2 {
  font-size: clamp(28px, 3.6vw, 42px);
  margin-bottom: 14px;
}

.section-head p {
  color: var(--color-text-secondary);
  font-size: 17px;
}

/* ---------------------------------- */
/* 3. Buttons                         */
/* ---------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 15px;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
  white-space: nowrap;
}
.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: var(--shadow-primary);
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 18px 36px rgba(37,99,235,0.34); }

.btn-accent {
  background: var(--gradient-accent);
  color: #fff;
  box-shadow: var(--shadow-accent);
}
.btn-accent:hover { transform: translateY(-3px); box-shadow: 0 18px 36px rgba(249,115,22,0.34); }

.btn-outline {
  background: var(--color-surface);
  color: var(--color-text);
  border: 1.5px solid var(--color-border);
}
.btn-outline:hover { border-color: var(--color-primary); color: var(--color-primary); transform: translateY(-3px); }

.btn-white {
  background: #fff;
  color: var(--color-primary);
  box-shadow: var(--shadow-lg);
}
.btn-white:hover { transform: translateY(-3px); }

.btn-block { width: 100%; }
.btn-lg { padding: 16px 34px; font-size: 16px; }
.btn-sm { padding: 10px 18px; font-size: 13px; }

/* ---------------------------------- */
/* 4. Navbar                          */
/* ---------------------------------- */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 20px 0;
  transition: all var(--transition-med);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  background-color: var(--color-navbar-bg);
  background-image: linear-gradient(120deg, rgba(37,99,235,0.06), rgba(249,115,22,0.04));
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  padding: 10px 12px 10px 22px;
  box-shadow: 0 4px 24px rgba(17,24,39,0.06);
  transition: all var(--transition-med);
}

.navbar.scrolled .navbar-inner {
  box-shadow: 0 8px 30px rgba(17,24,39,0.12);
  background-color: var(--color-navbar-bg-scrolled);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  color: var(--color-text);
}

.nav-logo-mark {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 16px;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-links a {
  padding: 10px 16px;
  border-radius: var(--radius-full);
  font-size: 14.5px;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.nav-links a:hover, .nav-links a.active {
  color: var(--color-primary);
  background: var(--color-primary-50);
}

.nav-actions { display: flex; align-items: center; gap: 10px; }

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  color: var(--color-text-secondary);
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  flex-shrink: 0;
  transition: color var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}
.theme-toggle:hover { color: var(--color-primary); border-color: var(--color-primary); transform: translateY(-2px); }
.theme-toggle svg { display: block; }
[data-theme-toggle] .icon-moon { display: none; }
[data-theme-toggle][aria-pressed="true"] .icon-sun { display: none; }
[data-theme-toggle][aria-pressed="true"] .icon-moon { display: block; }

.auth-toggle-theme { position: absolute; top: 32px; right: 40px; z-index: 10; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}
.nav-toggle span {
  width: 22px; height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

/* ---------------------------------- */
/* 13. Back to Top                    */
/* ---------------------------------- */
.back-to-top {
  position: fixed;
  bottom: 28px; right: 28px;
  width: 48px; height: 48px;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  box-shadow: var(--shadow-primary);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all var(--transition-fast);
  z-index: 900;
}
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { transform: translateY(-4px); }

/* ---------------------------------- */
/* 14. Scroll Reveal                  */
/* ---------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}
.reveal.in-view { opacity: 1; transform: translateY(0); }
.reveal-stagger.in-view > * { animation: none; }

/* ---------------------------------- */
/* 17. Utilities                      */
/* ---------------------------------- */
.text-center { text-align: center; }
.mt-24 { margin-top: 24px; }

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 900px) {
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
  :root { --space-section: var(--space-section-mobile); }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .navbar-inner { padding: 8px 8px 8px 16px; }
  .btn-lg { padding: 13px 22px; font-size: 14.5px; }
}