/* ============================================================
   BIZCHAT — DESIGN SYSTEM
   main.css — Tokens, Reset, Typography, Utilities
   ============================================================ */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* ─── CSS Custom Properties (Design Tokens) ─── */
:root {
  /* Brand Colors */
  --brand-primary:     #2563EB;
  --brand-primary-dark:#1D4ED8;
  --brand-primary-light:#DBEAFE;
  --brand-accent:      #10B981;
  --brand-accent-dark: #059669;
  --brand-accent-light:#D1FAE5;

  /* Neutral Scale */
  --neutral-50:  #F8FAFC;
  --neutral-100: #F1F5F9;
  --neutral-200: #E2E8F0;
  --neutral-300: #CBD5E1;
  --neutral-400: #94A3B8;
  --neutral-500: #64748B;
  --neutral-600: #475569;
  --neutral-700: #334155;
  --neutral-800: #1E293B;
  --neutral-900: #0F172A;

  /* Semantic Colors */
  --color-bg:        #FFFFFF;
  --color-surface:   #F8FAFC;
  --color-surface-2: #F1F5F9;
  --color-border:    #E2E8F0;
  --color-text:      #0F172A;
  --color-text-muted:#64748B;
  --color-dark-bg:   #0F172A;

  /* Status */
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-error:   #EF4444;

  /* Typography */
  --font-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs:   0.75rem;   /* 12px */
  --font-size-sm:   0.875rem;  /* 14px */
  --font-size-base: 1rem;      /* 16px */
  --font-size-lg:   1.125rem;  /* 18px */
  --font-size-xl:   1.25rem;   /* 20px */
  --font-size-2xl:  1.5rem;    /* 24px */
  --font-size-3xl:  1.875rem;  /* 30px */
  --font-size-4xl:  2.25rem;   /* 36px */
  --font-size-5xl:  3rem;      /* 48px */
  --font-size-6xl:  3.75rem;   /* 60px */
  --font-size-7xl:  4.5rem;    /* 72px */

  /* Font Weights */
  --fw-light:    300;
  --fw-regular:  400;
  --fw-medium:   500;
  --fw-semibold: 600;
  --fw-bold:     700;
  --fw-extrabold:800;
  --fw-black:    900;

  /* 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;

  /* Border Radius */
  --radius-sm:   0.375rem;
  --radius-md:   0.5rem;
  --radius-lg:   0.75rem;
  --radius-xl:   1rem;
  --radius-2xl:  1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow:    0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.05);
  --shadow-md: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.05);
  --shadow-lg: 0 20px 25px -5px rgb(0 0 0 / 0.08), 0 8px 10px -6px rgb(0 0 0 / 0.05);
  --shadow-xl: 0 25px 50px -12px rgb(0 0 0 / 0.15);
  --shadow-brand: 0 10px 30px -5px rgb(37 99 235 / 0.3);
  --shadow-accent: 0 10px 30px -5px rgb(16 185 129 / 0.3);

  /* Transitions */
  --transition-fast:   150ms ease;
  --transition-base:   250ms ease;
  --transition-slow:   350ms ease;
  --transition-bounce: 350ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Z-index */
  --z-dropdown: 100;
  --z-sticky:   200;
  --z-modal:    300;
  --z-toast:    400;

  /* Container */
  --container-max: 1280px;
  --container-pad: var(--space-6);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-base);
  font-size: var(--font-size-base);
  font-weight: var(--fw-regular);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

ul, ol {
  list-style: none;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  font-weight: var(--fw-bold);
  letter-spacing: -0.02em;
}

/* ─── Typography Helpers ─── */
.text-xs     { font-size: var(--font-size-xs); }
.text-sm     { font-size: var(--font-size-sm); }
.text-base   { font-size: var(--font-size-base); }
.text-lg     { font-size: var(--font-size-lg); }
.text-xl     { font-size: var(--font-size-xl); }
.text-2xl    { font-size: var(--font-size-2xl); }
.text-3xl    { font-size: var(--font-size-3xl); }
.text-4xl    { font-size: var(--font-size-4xl); }
.text-5xl    { font-size: var(--font-size-5xl); }
.text-6xl    { font-size: var(--font-size-6xl); }
.text-7xl    { font-size: var(--font-size-7xl); }

.font-light     { font-weight: var(--fw-light); }
.font-regular   { font-weight: var(--fw-regular); }
.font-medium    { font-weight: var(--fw-medium); }
.font-semibold  { font-weight: var(--fw-semibold); }
.font-bold      { font-weight: var(--fw-bold); }
.font-extrabold { font-weight: var(--fw-extrabold); }
.font-black     { font-weight: var(--fw-black); }

.text-primary   { color: var(--brand-primary); }
.text-accent    { color: var(--brand-accent); }
.text-muted     { color: var(--color-text-muted); }
.text-white     { color: #ffffff; }
.text-dark      { color: var(--color-text); }

.text-center { text-align: center; }
.text-left   { text-align: left; }
.text-right  { text-align: right; }

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

.section {
  padding: var(--space-24) 0;
}
.section-sm {
  padding: var(--space-16) 0;
}
.section-lg {
  padding: var(--space-32) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-16);
}
.section-header h2 {
  font-size: var(--font-size-4xl);
  font-weight: var(--fw-extrabold);
  color: var(--color-text);
  margin-bottom: var(--space-4);
  letter-spacing: -0.03em;
}
.section-header p {
  font-size: var(--font-size-lg);
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

/* Grid System */
.grid { display: grid; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-6 { grid-template-columns: repeat(6, 1fr); }
.gap-4  { gap: var(--space-4); }
.gap-6  { gap: var(--space-6); }
.gap-8  { gap: var(--space-8); }
.gap-12 { gap: var(--space-12); }

/* Flex */
.flex       { display: flex; }
.flex-col   { flex-direction: column; }
.items-center { align-items: center; }
.items-start  { align-items: flex-start; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.flex-wrap { flex-wrap: wrap; }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }

/* ─── Section Label / Badge ─── */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-xs);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--brand-primary);
  background: var(--brand-primary-light);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-4);
}

/* ─── Gradient Text ─── */
.gradient-text {
  background: linear-gradient(135deg, var(--brand-primary) 0%, #7C3AED 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.gradient-text-green {
  background: linear-gradient(135deg, #059669 0%, var(--brand-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  font-weight: var(--fw-semibold);
  transition: all var(--transition-base);
  white-space: nowrap;
  cursor: pointer;
  border: 2px solid transparent;
  text-decoration: none;
  line-height: 1;
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: var(--font-size-base);
  border-radius: var(--radius-xl);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: var(--font-size-xs);
}

.btn-primary {
  background: var(--brand-primary);
  color: #ffffff;
  border-color: var(--brand-primary);
  box-shadow: var(--shadow-brand);
}
.btn-primary:hover {
  background: var(--brand-primary-dark);
  border-color: var(--brand-primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 14px 35px -5px rgb(37 99 235 / 0.4);
}

.btn-accent {
  background: var(--brand-accent);
  color: #ffffff;
  border-color: var(--brand-accent);
  box-shadow: var(--shadow-accent);
}
.btn-accent:hover {
  background: var(--brand-accent-dark);
  border-color: var(--brand-accent-dark);
  transform: translateY(-1px);
}

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

.btn-outline-white {
  background: transparent;
  color: #ffffff;
  border-color: rgba(255,255,255,0.5);
}
.btn-outline-white:hover {
  background: rgba(255,255,255,0.15);
  border-color: #ffffff;
}

.btn-ghost {
  background: transparent;
  color: var(--color-text);
  border-color: transparent;
}
.btn-ghost:hover {
  background: var(--neutral-100);
}

/* ─── Cards ─── */
.card {
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  box-shadow: var(--shadow);
  transition: all var(--transition-base);
}
.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-color: var(--brand-primary-light);
}

.card-surface {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
}

/* ─── Badges ─── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--fw-semibold);
}

.badge-primary { background: var(--brand-primary-light); color: var(--brand-primary-dark); }
.badge-accent  { background: var(--brand-accent-light);  color: var(--brand-accent-dark); }
.badge-purple  { background: #EDE9FE; color: #6D28D9; }

/* ─── Icon Box ─── */
.icon-box {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.icon-box-primary { background: var(--brand-primary-light); color: var(--brand-primary); }
.icon-box-accent  { background: var(--brand-accent-light);  color: var(--brand-accent); }
.icon-box-purple  { background: #EDE9FE; color: #7C3AED; }
.icon-box-orange  { background: #FEF3C7; color: #D97706; }
.icon-box-lg {
  width: 68px;
  height: 68px;
  border-radius: var(--radius-2xl);
}

/* ─── Animations ─── */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}
@keyframes slideInLeft {
  from { opacity: 0; transform: translateX(-30px); }
  to   { opacity: 1; transform: translateX(0); }
}
@keyframes slideInRight {
  from { opacity: 0; transform: translateX(30px); }
  to   { opacity: 1; transform: translateX(0); }
}
@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.92); }
  to   { opacity: 1; transform: scale(1); }
}
@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50%       { transform: translateY(-12px); }
}
@keyframes pulse-ring {
  0%   { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(37,99,235,0.5); }
  70%  { transform: scale(1);    box-shadow: 0 0 0 15px rgba(37,99,235,0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(37,99,235,0); }
}
@keyframes shimmer {
  0%   { background-position: -200% 0; }
  100% { background-position:  200% 0; }
}
@keyframes spin-slow {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}
@keyframes bounceX {
  0%, 100% { transform: translateX(0); }
  50%       { transform: translateX(5px); }
}

/* Animate on scroll — initial hidden state */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.animate-on-scroll.animated {
  opacity: 1;
  transform: translateY(0);
}
.animate-delay-1 { transition-delay: 0.1s; }
.animate-delay-2 { transition-delay: 0.2s; }
.animate-delay-3 { transition-delay: 0.3s; }
.animate-delay-4 { transition-delay: 0.4s; }
.animate-delay-5 { transition-delay: 0.5s; }

/* Floating animation */
.float-anim { animation: float 4s ease-in-out infinite; }

/* ─── Background Patterns ─── */
.bg-grid {
  background-image: 
    linear-gradient(rgba(37,99,235,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(37,99,235,0.04) 1px, transparent 1px);
  background-size: 32px 32px;
}

.bg-dots {
  background-image: radial-gradient(circle, rgba(37,99,235,0.12) 1px, transparent 1px);
  background-size: 24px 24px;
}

.bg-gradient-hero {
  background: linear-gradient(135deg, #EFF6FF 0%, #F0FDF4 50%, #F5F3FF 100%);
}

.bg-brand {
  background: linear-gradient(135deg, var(--brand-primary) 0%, #1D4ED8 100%);
}
.bg-dark    { background: var(--color-dark-bg); }
.bg-surface { background: var(--color-surface); }
.bg-white   { background: #ffffff; }

/* ─── Dividers ─── */
.divider {
  height: 1px;
  background: var(--color-border);
  margin: var(--space-8) 0;
}

/* ─── Form Inputs ─── */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-label {
  font-size: var(--font-size-sm);
  font-weight: var(--fw-medium);
  color: var(--color-text);
}

.form-input {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  color: var(--color-text);
  background: #ffffff;
  transition: all var(--transition-fast);
  outline: none;
}
.form-input:focus {
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px rgb(37 99 235 / 0.12);
}
.form-input::placeholder {
  color: var(--neutral-400);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

/* ─── Tags / Pills ─── */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--fw-medium);
  background: var(--neutral-100);
  color: var(--neutral-600);
}

/* ─── Gradient Borders ─── */
.gradient-border {
  position: relative;
  border-radius: var(--radius-2xl);
  padding: 2px;
  background: linear-gradient(135deg, var(--brand-primary), var(--brand-accent));
}
.gradient-border > * {
  background: #ffffff;
  border-radius: calc(var(--radius-2xl) - 2px);
}

/* ─── Glow Effects ─── */
.glow-primary {
  box-shadow: 0 0 40px -10px rgb(37 99 235 / 0.4);
}
.glow-accent {
  box-shadow: 0 0 40px -10px rgb(16 185 129 / 0.4);
}

/* ─── Responsive Utilities ─── */
.hidden { display: none !important; }
.visible { display: block !important; }

/* ─── Scroll Bar ─── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--neutral-100); }
::-webkit-scrollbar-thumb { background: var(--neutral-300); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--neutral-400); }

/* ─── Responsive Breakpoints ─── */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-6 { grid-template-columns: repeat(3, 1fr); }
  .section-header h2 { font-size: var(--font-size-3xl); }
}

@media (max-width: 768px) {
  :root { --container-pad: var(--space-4); }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .grid-6 { grid-template-columns: repeat(2, 1fr); }
  .section { padding: var(--space-16) 0; }
  .section-lg { padding: var(--space-20) 0; }
  .section-header h2 { font-size: var(--font-size-2xl); }
  .section-header p { font-size: var(--font-size-base); }
  .btn-lg { padding: 0.875rem 1.5rem; font-size: var(--font-size-sm); }
}

@media (max-width: 480px) {
  .grid-6 { grid-template-columns: repeat(2, 1fr); }
}