/* QuickShare — Design system (thème clair) */
:root {
  --bg: #f0f4ff;
  --bg-elevated: #ffffff;
  --bg-card: #ffffff;
  --border: #dde2ef;
  --border-focus: #2563eb;
  --text: #1e293b;
  --text-muted: #64748b;
  --accent: #2563eb;
  --accent-hover: #3b82f6;
  --accent-soft: rgba(37, 99, 235, 0.08);
  --success: #16a34a;
  --error: #dc2626;
  --radius: 16px;
  --radius-sm: 12px;
  --font: 'DM Sans', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --shadow: 0 4px 24px rgba(30, 41, 59, 0.08);
  --shadow-lg: 0 20px 48px rgba(30, 41, 59, 0.12);
  --transition: 0.25s ease;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

#app {
  min-height: 100vh;
}

.screen {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  position: relative;
}

.hidden {
  display: none !important;
}

.screen.hidden {
  display: none;
}

/* Login */
.login-card {
  width: 100%;
  max-width: 400px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2.5rem;
  box-shadow: var(--shadow-lg);
  position: relative;
  z-index: 2;
}

.logo {
  text-align: center;
  margin-bottom: 2rem;
}

.logo-img {
  display: block;
  width: 120px;
  height: auto;
  margin: 0 auto 1rem;
  object-fit: contain;
}

.logo-img-small {
  width: 36px;
  height: 36px;
  object-fit: contain;
}

.logo h1 {
  margin: 0;
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.tagline {
  margin: 0.25rem 0 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.login-form label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
}

.login-form input {
  width: 100%;
  padding: 0.9rem 1rem;
  font-family: var(--font);
  font-size: 1rem;
  color: var(--text);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.login-form input::placeholder {
  color: var(--text-muted);
  opacity: 0.7;
}

.login-form input:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.9rem 1.5rem;
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 500;
  color: #fff;
  background: var(--accent);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition), transform 0.1s ease;
}

.btn:hover {
  background: var(--accent-hover);
}

.btn:active {
  transform: scale(0.98);
}

.btn.copied {
  background: var(--success);
}

.btn-arrow {
  opacity: 0.9;
}

.error-msg {
  margin: 1rem 0 0;
  font-size: 0.9rem;
  color: var(--error);
  text-align: center;
  display: none;
}

.error-msg[aria-hidden="false"] {
  display: block;
}

/* Background (thème clair) */
.bg-grid {
  position: fixed;
  inset: 0;
  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: 48px 48px;
  pointer-events: none;
  z-index: 0;
}

.bg-gradient-orb {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.bg-gradient-orb::before,
.bg-gradient-orb::after {
  content: '';
  position: absolute;
  width: 60vmax;
  height: 60vmax;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.35;
  animation: orb-float 20s ease-in-out infinite;
}

.bg-gradient-orb::before {
  background: linear-gradient(135deg, #93c5fd, #c7d2fe);
  top: -20%;
  left: -10%;
}

.bg-gradient-orb::after {
  background: linear-gradient(225deg, #bfdbfe, #e0e7ff);
  bottom: -20%;
  right: -10%;
  animation-delay: -10s;
}

@keyframes orb-float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(3%, 3%) scale(1.05); }
}

/* Upload screen */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  background: rgba(255, 255, 255, 0.85);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
  z-index: 10;
}

.logo-small {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--text);
}

.btn-ghost {
  padding: 0.5rem 1rem;
  font-family: var(--font);
  font-size: 0.9rem;
  color: var(--text-muted);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: color var(--transition), background var(--transition);
}

.btn-ghost:hover {
  color: var(--text);
  background: var(--bg-elevated);
}

.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 6rem 2rem 3rem;
  width: 100%;
  max-width: 640px;
  margin: 0 auto;
}

/* Drop zone */
.drop-zone {
  width: 100%;
  min-height: 320px;
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  background: var(--bg-card);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  transition: border-color var(--transition), background var(--transition), transform var(--transition);
  cursor: pointer;
  position: relative;
}

.drop-zone:hover,
.drop-zone.drag-over {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.drop-zone.drag-over {
  transform: scale(1.01);
}

.drop-content {
  text-align: center;
  pointer-events: none;
}

.drop-zone .drop-progress {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  width: 100%;
  max-width: 320px;
}

.drop-zone.uploading .drop-content {
  display: none;
}

.drop-zone.uploading .drop-progress {
  display: flex;
}

.drop-icon {
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.drop-zone:hover .drop-icon,
.drop-zone.drag-over .drop-icon {
  color: var(--accent);
}

.drop-title {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 600;
}

.drop-sub {
  margin: 0.5rem 0 0;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--bg-elevated);
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  display: block;
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), #60a5fa);
  border-radius: 4px;
  transition: width 0.3s ease;
}

.progress-text {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Result card */
.result-card {
  width: 100%;
  margin-top: 2rem;
  padding: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.result-card.hidden {
  display: none;
}

.result-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.result-badge {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--success);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.result-link {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--text-muted);
  word-break: break-all;
  padding: 0.75rem;
  background: var(--bg-elevated);
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
}

.result-hint {
  margin: 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.copy-icon {
  font-size: 1.1rem;
}

/* Download page */
.download-page {
  min-height: 100vh;
  background: var(--bg);
  padding: 2rem;
  font-family: var(--font);
}

.download-container {
  max-width: 560px;
  margin: 0 auto;
  padding: 3rem 0;
  position: relative;
  z-index: 1;
}

.download-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 2rem;
  font-weight: 600;
  font-size: 1.1rem;
}

.download-logo {
  color: var(--text);
}

.download-title {
  margin: 0 0 0.5rem;
  font-size: 1.5rem;
  font-weight: 600;
}

.download-sub {
  margin: 0 0 2rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.files-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.file-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition);
}

.file-item:hover {
  border-color: var(--border-focus);
}

.file-name {
  font-weight: 500;
  word-break: break-all;
}

.file-size {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
  flex-shrink: 0;
}

.file-item a {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  flex-shrink: 0;
}

.file-item a:hover {
  text-decoration: underline;
}

.download-error {
  text-align: center;
  padding: 3rem 2rem;
  color: var(--text-muted);
}

.download-error-logo {
  width: 64px;
  height: auto;
  margin: 0 auto 1rem;
  display: block;
  opacity: 0.7;
}

.download-loading {
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
}

.spinner {
  width: 40px;
  height: 40px;
  margin: 0 auto 1rem;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* 404 */
.notfound-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  padding: 2rem;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  text-align: center;
}

.notfound-logo {
  width: 80px;
  height: auto;
  margin-bottom: 1rem;
  opacity: 0.8;
}

.notfound-page h1 {
  margin: 0 0 0.5rem;
  font-size: 1.5rem;
}

.notfound-page p {
  margin: 0;
  color: var(--text-muted);
}

.notfound-page a {
  margin-top: 1.5rem;
  color: var(--accent);
  text-decoration: none;
}

.notfound-page a:hover {
  text-decoration: underline;
}

/* Animations d'entrée */
.animate-in {
  opacity: 0;
  transform: translateY(12px);
}

.animate-in.visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

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