/* ============================================================
   P2P SHARE — main.css
   Global design tokens, reset, typography, utilities, dark mode
   ============================================================ */

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

/* ─── Design Tokens ──────────────────────────────────────────────────────── */
:root {
  /* Brand Colors - Indigo & Teal */
  --clr-primary-h: 238;
  --clr-primary:   hsl(238, 80%, 65%);
  --clr-primary-light: hsl(238, 80%, 75%);
  --clr-primary-dark:  hsl(238, 80%, 55%);
  --clr-primary-glow:  hsl(238, 80%, 65%, 0.3);

  --clr-accent:   hsl(180, 85%, 45%);
  --clr-success:  hsl(150, 75%, 45%);
  --clr-warning:  hsl(40, 95%, 55%);
  --clr-danger:   hsl(350, 75%, 55%);

  /* Neutral - Light (Slate) */
  --clr-bg:        hsl(210, 20%, 98%);
  --clr-bg-2:      hsl(210, 16%, 93%);
  --clr-surface:   hsl(0, 0%, 100%);
  --clr-surface-2: hsl(210, 20%, 96%);
  --clr-border:    hsl(210, 14%, 89%);
  --clr-text:      hsl(220, 39%, 11%);
  --clr-text-2:    hsl(215, 16%, 47%);
  --clr-text-3:    hsl(215, 14%, 65%);

  /* Glassmorphism */
  --glass-bg:      hsl(0, 0%, 100%, 0.8);
  --glass-border:  hsl(0, 0%, 100%, 0.5);

  /* Shadows */
  --shadow-sm:  0 2px 4px hsl(220, 30%, 10%, 0.04), 0 1px 2px hsl(220, 30%, 10%, 0.02);
  --shadow-md:  0 8px 24px hsl(220, 30%, 10%, 0.06), 0 2px 8px hsl(220, 30%, 10%, 0.04);
  --shadow-lg:  0 16px 48px hsl(220, 30%, 10%, 0.08), 0 8px 16px hsl(220, 30%, 10%, 0.06);
  --shadow-glow: 0 0 32px var(--clr-primary-glow);

  /* 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;

  /* Radius */
  --r-sm: 8px; --r-md: 16px; --r-lg: 24px; --r-xl: 32px; --r-full: 9999px;

  /* Transition */
  --transition: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Font */
  --font: 'Outfit', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

/* ─── Dark Mode (Slate) ──────────────────────────────────────────────────── */
[data-theme="dark"] {
  --clr-bg:        hsl(222, 47%, 11%);
  --clr-bg-2:      hsl(222, 47%, 15%);
  --clr-surface:   hsl(222, 47%, 14%);
  --clr-surface-2: hsl(222, 47%, 18%);
  --clr-border:    hsl(217, 33%, 22%);
  --clr-text:      hsl(210, 40%, 98%);
  --clr-text-2:    hsl(215, 20%, 65%);
  --clr-text-3:    hsl(215, 15%, 45%);
  
  --glass-bg:      hsl(222, 47%, 14%, 0.75);
  --glass-border:  hsl(217, 33%, 30%, 0.4);

  --shadow-sm:  0 2px 4px hsl(0,0%,0%,0.4), 0 1px 2px hsl(0,0%,0%,0.2);
  --shadow-md:  0 8px 24px hsl(0,0%,0%,0.5), 0 2px 8px hsl(0,0%,0%,0.3);
  --shadow-lg:  0 16px 48px hsl(0,0%,0%,0.6), 0 8px 16px hsl(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);
  background: var(--clr-bg);
  color: var(--clr-text);
  line-height: 1.6;
  min-height: 100vh;
  transition: background var(--transition-slow), color var(--transition-slow);
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; max-width: 100%; }
a { color: var(--clr-primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--clr-primary-light); }
button { cursor: pointer; font-family: var(--font); }
input, select, textarea { font-family: var(--font); }

/* ─── Typography ─────────────────────────────────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--clr-text);
}
h1 { font-size: clamp(2.5rem, 6vw, 4rem); letter-spacing: -0.03em; }
h2 { font-size: clamp(1.75rem, 4vw, 2.5rem); letter-spacing: -0.02em; }
h3 { font-size: clamp(1.25rem, 3vw, 1.75rem); letter-spacing: -0.01em;}
h4 { font-size: 1.125rem; }
p  { color: var(--clr-text-2); }

/* ─── Layout ─────────────────────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--sp-6);
}
.container--sm { max-width: 768px; }
.container--xs { max-width: 560px; }

/* ─── Buttons ────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: var(--sp-3) var(--sp-6);
  border-radius: var(--r-full);
  font-size: 1rem;
  font-weight: 600;
  border: 1px solid transparent;
  transition: all var(--transition);
  white-space: nowrap;
  user-select: none;
  position: relative;
  overflow: hidden;
}
.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: white;
  opacity: 0;
  transition: opacity var(--transition);
}
.btn:hover::after { opacity: 0.1; }
.btn:active { transform: scale(0.96); }
.btn i { font-size: 1.15em; }

.btn-primary {
  background: linear-gradient(135deg, var(--clr-primary), var(--clr-primary-dark));
  color: #fff;
  box-shadow: 0 4px 24px var(--clr-primary-glow);
}
.btn-primary:hover { box-shadow: 0 8px 32px var(--clr-primary-glow); transform: translateY(-2px); color: #fff;}

.btn-secondary {
  background: var(--glass-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: var(--clr-text);
  border-color: var(--clr-border);
  box-shadow: var(--shadow-sm);
}
.btn-secondary:hover { border-color: var(--clr-primary); color: var(--clr-primary); transform: translateY(-2px); box-shadow: var(--shadow-md); }

.btn-ghost {
  background: transparent;
  color: var(--clr-text-2);
  border-color: transparent;
}
.btn-ghost:hover { background: var(--clr-surface-2); color: var(--clr-text); }

.btn-danger {
  background: linear-gradient(135deg, var(--clr-danger), hsl(350, 75%, 45%));
  color: #fff;
}

.btn-success {
  background: linear-gradient(135deg, var(--clr-success), hsl(150, 75%, 35%));
  color: #fff;
}

.btn--sm { padding: var(--sp-2) var(--sp-4); font-size: 0.875rem; }
.btn--lg { padding: var(--sp-4) var(--sp-8); font-size: 1.125rem; }
.btn--xl { padding: var(--sp-5) var(--sp-10); font-size: 1.25rem; }

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* ─── Card ───────────────────────────────────────────────────────────────── */
.card {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--r-xl);
  padding: var(--sp-8);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), border-color var(--transition), transform var(--transition);
}
.card:hover { box-shadow: var(--shadow-md); border-color: var(--clr-primary-glow); }

/* ─── Progress Bar ───────────────────────────────────────────────────────── */
.progress-wrap {
  background: var(--clr-bg-2);
  border-radius: var(--r-full);
  height: 12px;
  overflow: hidden;
  position: relative;
  box-shadow: inset 0 1px 3px rgba(0,0,0,0.1);
}
.progress-bar {
  height: 100%;
  border-radius: var(--r-full);
  background: linear-gradient(90deg, var(--clr-primary), var(--clr-accent));
  transition: width 300ms ease-out;
  position: relative;
}
.progress-bar::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent 0%, rgba(255,255,255,0.4) 50%, transparent 100%);
  animation: shimmer 1.5s infinite linear;
}
@keyframes shimmer {
  0%   { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}
.progress-bar--success { background: linear-gradient(90deg, var(--clr-success), hsl(150, 75%, 55%)); }

/* ─── Badge / Status ─────────────────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-1);
  padding: var(--sp-1) var(--sp-3);
  border-radius: var(--r-full);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.badge--success { background: hsl(150, 75%, 45%, 0.15); color: var(--clr-success); }
.badge--warning { background: hsl(40, 95%, 55%, 0.15); color: var(--clr-warning); }
.badge--danger  { background: hsl(350, 75%, 55%, 0.15); color: var(--clr-danger); }
.badge--info    { background: hsl(238, 80%, 65%, 0.15); color: var(--clr-primary); }
.badge--neutral { background: var(--clr-bg-2); color: var(--clr-text-2); }

/* Pulse dot */
.dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  display: inline-block;
  flex-shrink: 0;
}
.dot--pulse {
  animation: pulse-dot 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); box-shadow: 0 0 0 0px var(--dot-color); }
  50%      { opacity: 0.7; transform: scale(0.9); box-shadow: 0 0 0 6px rgba(0,0,0,0); }
}
.dot--green  { background: var(--clr-success); --dot-color: hsl(150, 75%, 45%, 0.4); }
.dot--yellow { background: var(--clr-warning); --dot-color: hsl(40, 95%, 55%, 0.4); }
.dot--red    { background: var(--clr-danger); --dot-color: hsl(350, 75%, 55%, 0.4); }
.dot--blue   { background: var(--clr-primary); --dot-color: hsl(238, 80%, 65%, 0.4); }
.dot--gray   { background: var(--clr-text-3); --dot-color: hsl(215, 15%, 45%, 0.4); }

/* ─── Toast Notifications ────────────────────────────────────────────────── */
#toast-container {
  position: fixed;
  bottom: var(--sp-6);
  right: var(--sp-6);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  pointer-events: none;
}
.toast {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--r-lg);
  padding: var(--sp-4) var(--sp-5);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  font-size: 0.9375rem;
  font-weight: 500;
  min-width: 280px;
  max-width: 400px;
  animation: toast-in 400ms cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
  pointer-events: auto;
}
.toast.removing { animation: toast-out 300ms ease forwards; }
@keyframes toast-in {
  from { opacity: 0; transform: translateX(120%) scale(0.95); }
  to   { opacity: 1; transform: translateX(0) scale(1); }
}
@keyframes toast-out {
  from { opacity: 1; transform: translateX(0) scale(1); }
  to   { opacity: 0; transform: translateX(120%) scale(0.95); }
}
.toast-icon { font-size: 1.25rem; flex-shrink: 0; }
.toast--success .toast-icon { color: var(--clr-success); }
.toast--warning .toast-icon { color: var(--clr-warning); }
.toast--error   .toast-icon { color: var(--clr-danger); }
.toast--info    .toast-icon { color: var(--clr-primary); }

/* ─── Topbar ─────────────────────────────────────────────────────────────── */
.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  transition: background var(--transition-slow), border-color var(--transition-slow);
}
.topbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.topbar__logo {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  font-weight: 800;
  font-size: 1.5rem;
  color: var(--clr-text);
  letter-spacing: -0.02em;
}
.topbar__logo span:last-child { color: var(--clr-primary); }
.topbar__logo i { color: var(--clr-primary); font-size: 1.2em; }
.topbar__actions { display: flex; align-items: center; gap: var(--sp-2); }

/* ─── Icon Button ────────────────────────────────────────────────────────── */
.icon-btn {
  width: 44px; height: 44px;
  border-radius: var(--r-full);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid transparent;
  color: var(--clr-text-2);
  font-size: 1.25rem;
  transition: all var(--transition);
  cursor: pointer;
}
.icon-btn:hover {
  background: var(--clr-surface-2);
  border-color: var(--clr-border);
  color: var(--clr-primary);
  transform: rotate(15deg);
}

/* ─── Divider ────────────────────────────────────────────────────────────── */
.divider {
  height: 1px;
  background: var(--clr-border);
  margin: var(--sp-6) 0;
}

/* ─── Utility Classes ────────────────────────────────────────────────────── */
.flex   { display: flex; }
.flex-col { display: flex; flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: var(--sp-1); } .gap-2 { gap: var(--sp-2); }
.gap-3 { gap: var(--sp-3); } .gap-4 { gap: var(--sp-4); }
.gap-6 { gap: var(--sp-6); }
.w-full { width: 100%; }
.text-center { text-align: center; }
.text-sm { font-size: 0.875rem; }
.text-xs { font-size: 0.75rem; }
.text-lg { font-size: 1.125rem; }
.text-muted { color: var(--clr-text-2); }
.text-muted-2 { color: var(--clr-text-3); }
.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.font-medium { font-weight: 500; }
.mt-auto { margin-top: auto; }
.hidden { display: none !important; }

/* ─── Animations ─────────────────────────────────────────────────────────── */
@keyframes fade-in {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes scale-in {
  from { opacity: 0; transform: scale(0.9); }
  to   { opacity: 1; transform: scale(1); }
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-12px); }
}
@keyframes spin {
  to { transform: rotate(360deg); }
}
.animate-fade-in { animation: fade-in 600ms cubic-bezier(0.2, 0.8, 0.2, 1) forwards; }
.animate-scale-in { animation: scale-in 400ms cubic-bezier(0.2, 0.8, 0.2, 1) forwards; }

/* ─── Modal Overlay ──────────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: hsl(222, 47%, 11%, 0.8);
  backdrop-filter: blur(8px);
  z-index: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--sp-4);
  animation: fade-overlay 300ms ease;
}
@keyframes fade-overlay {
  from { opacity: 0; } to { opacity: 1; }
}

/* ─── Responsive ─────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  :root { --sp-6: 1.25rem; --r-xl: 24px;}
  .container { padding: 0 var(--sp-4); }
  .topbar__inner { height: 64px; }
  #toast-container { bottom: var(--sp-4); right: var(--sp-4); left: var(--sp-4); }
  .toast { min-width: auto; max-width: 100%; }
}