/* ─── DecentraSend — Clean light theme (white + blue) ─── */

:root {
  --bg: #f8fafc;
  --bg-subtle: #ffffff;
  --bg-card: #ffffff;
  --bg-elevated: #f1f5f9;
  --border: #e2e8f0;
  --border-hover: #cbd5e1;
  --text: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --accent: #3b82f6;
  --accent-dim: #2563eb;
  --accent-glow: rgba(37, 99, 235, 0.08);
  --accent-glow-strong: rgba(37, 99, 235, 0.15);
  --success: #10b981;
  --success-dim: rgba(16, 185, 129, 0.08);
  --error: #ef4444;
  --error-dim: rgba(239, 68, 68, 0.06);
  --radius: 10px;
  --radius-lg: 14px;
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", ui-monospace, monospace;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.06), 0 2px 4px -2px rgba(0,0,0,0.04);
}

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  line-height: 1.5;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: opacity 0.15s;
}

a:hover {
  opacity: 0.8;
}

/* ─── Header ─── */
.header {
  text-align: center;
  padding: 4rem 1.5rem 1.5rem;
  max-width: 640px;
}

.logo {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.75px;
  margin-bottom: 0.6rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.logo-icon {
  width: 28px;
  height: 28px;
  background: linear-gradient(135deg, var(--accent-dim), var(--accent));
  border-radius: 7px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  color: #fff;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
}

.logo span {
  background: linear-gradient(135deg, var(--accent-dim), #3b82f6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header-subtitle {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
  max-width: 420px;
  margin: 0 auto;
}

.badge-row {
  display: flex;
  gap: 0.4rem;
  justify-content: center;
  margin-top: 1rem;
  flex-wrap: wrap;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.7rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.7rem;
  color: var(--text-muted);
  font-weight: 500;
  letter-spacing: 0.2px;
}

.badge-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
}

/* ─── Layout ─── */
.container {
  width: 100%;
  max-width: 520px;
  padding: 0 1rem;
}

/* ─── Cards ─── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 0.75rem;
  box-shadow: var(--shadow);
}

.card-title {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.card-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  line-height: 1.55;
}

/* ─── Inputs ─── */
input[type="text"],
input[type="password"] {
  width: 100%;
  padding: 0.6rem 0.85rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-family: var(--font);
  font-size: 0.82rem;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

input:focus {
  border-color: var(--accent-dim);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

input::placeholder {
  color: var(--text-muted);
}

textarea {
  width: 100%;
  padding: 0.6rem 0.85rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-secondary);
  font-size: 0.72rem;
  font-family: var(--font-mono);
  resize: none;
  outline: none;
  word-break: break-all;
  line-height: 1.5;
}

textarea:focus {
  border-color: var(--accent-dim);
}

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.55rem 1.15rem;
  border: none;
  border-radius: 8px;
  font-family: var(--font);
  font-size: 0.82rem;
  font-weight: 550;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent-dim);
  color: #fff;
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent);
  box-shadow: 0 2px 16px var(--accent-glow-strong);
}

.btn-primary:active:not(:disabled) {
  transform: scale(0.98);
}

.btn-primary:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-secondary {
  background: var(--bg-elevated);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--border);
  color: var(--text);
  border-color: var(--border-hover);
}

.btn-full {
  width: 100%;
}

.btn-row {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

/* ─── Input group ─── */
.input-group {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.input-group input {
  flex: 1;
}

/* ─── Drop zone ─── */
.drop-zone {
  border: 1.5px dashed var(--border-hover);
  border-radius: var(--radius);
  padding: 2.5rem 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  background: var(--bg-subtle);
}

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

.drop-zone-icon {
  width: 44px;
  height: 44px;
  margin: 0 auto 0.85rem;
  background: var(--accent-glow);
  border: 1px solid rgba(37, 99, 235, 0.15);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  color: var(--accent);
}

.drop-zone-text {
  font-size: 0.88rem;
  font-weight: 550;
  margin-bottom: 0.25rem;
  color: var(--text);
}

.drop-zone-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ─── Progress ─── */
.progress-group {
  margin-bottom: 0.85rem;
}

.progress-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  margin-bottom: 0.35rem;
  color: var(--text-secondary);
}

.progress-track {
  width: 100%;
  height: 4px;
  background: var(--bg-elevated);
  border-radius: 2px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: var(--accent);
  border-radius: 2px;
  width: 0%;
  transition: width 0.3s ease;
}

.progress-filename {
  font-size: 0.8rem;
  color: var(--text);
  margin-bottom: 0.85rem;
  font-weight: 500;
}

/* ─── Result ─── */
.result-section {
  text-align: center;
}

.result-check {
  width: 44px;
  height: 44px;
  margin: 0 auto 0.75rem;
  background: var(--success-dim);
  border: 1px solid rgba(16, 185, 129, 0.15);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--success);
}

.result-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
}

.result-meta {
  font-size: 0.73rem;
  color: var(--text-muted);
  margin-bottom: 0.85rem;
  line-height: 1.6;
}

.result-meta span {
  font-family: var(--font-mono);
  color: var(--text-secondary);
}

.share-link-box {
  margin: 0.85rem 0;
}

.share-link-box textarea {
  height: 68px;
}

/* ─── Download section ─── */
.dl-info {
  text-align: center;
  margin-bottom: 1.25rem;
}

.dl-info-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 0.85rem;
  background: var(--accent-glow);
  border: 1px solid rgba(37, 99, 235, 0.12);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  color: var(--accent);
}

.dl-info-title {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.dl-info-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

.dl-info-cid {
  font-size: 0.68rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  word-break: break-all;
  background: var(--bg-elevated);
  padding: 0.5rem 0.65rem;
  border-radius: 6px;
  border: 1px solid var(--border);
}

.dl-filename {
  margin-top: 0.75rem;
  font-size: 0.85rem;
  color: var(--success);
  font-weight: 500;
}

/* ─── History section ─── */
.history-empty {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.8rem;
  padding: 1.25rem 0;
}

.history-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.65rem 0.75rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 0.4rem;
  transition: border-color 0.15s;
}

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

.history-item-info {
  flex: 1;
  min-width: 0;
}

.history-item-name {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.history-item-meta {
  font-size: 0.68rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

.history-item-actions {
  display: flex;
  gap: 0.3rem;
  flex-shrink: 0;
  margin-left: 0.6rem;
}

.btn-icon {
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: transparent;
  color: var(--text-muted);
  font-size: 0.82rem;
  cursor: pointer;
  transition: all 0.15s;
}

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

.btn-icon-danger:hover {
  background: #fef2f2;
  color: var(--error);
  border-color: #fecaca;
}

/* ─── How it works ─── */
.steps {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.6rem;
}

.step {
  padding: 0.85rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.step-num {
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 0.3rem;
}

.step-title {
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 0.2rem;
}

.step-desc {
  font-size: 0.72rem;
  color: var(--text-muted);
  line-height: 1.45;
}

/* ─── Security callout ─── */
.security-info {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  padding: 0.65rem 0.75rem;
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  border-radius: 8px;
  margin-top: 0.85rem;
  font-size: 0.72rem;
  color: #1e40af;
  line-height: 1.45;
}

.security-info-icon {
  font-size: 0.85rem;
  flex-shrink: 0;
  margin-top: 1px;
}

/* ─── Toast ─── */
#toast-container {
  position: fixed;
  bottom: 1.25rem;
  right: 1.25rem;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.toast {
  padding: 0.6rem 1rem;
  border-radius: 8px;
  font-size: 0.8rem;
  font-weight: 500;
  animation: slideIn 0.2s ease;
  max-width: 300px;
  backdrop-filter: blur(8px);
}

.toast-success {
  background: #ecfdf5;
  color: #065f46;
  border: 1px solid #a7f3d0;
}

.toast-error {
  background: #fef2f2;
  color: #991b1b;
  border: 1px solid #fecaca;
}

.toast-info {
  background: #ffffff;
  color: var(--text);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-md);
}

.toast-fade {
  opacity: 0;
  transition: opacity 0.2s;
}

@keyframes slideIn {
  from { transform: translateY(8px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

/* ─── Footer ─── */
.footer {
  text-align: center;
  padding: 2.5rem 1rem 2rem;
  max-width: 520px;
  width: 100%;
}

.footer-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.footer-brand a {
  color: var(--text-secondary);
  font-weight: 600;
  transition: color 0.15s;
}

.footer-brand a:hover {
  color: var(--accent);
  opacity: 1;
}

.footer-links {
  display: flex;
  gap: 1.25rem;
  justify-content: center;
  font-size: 0.7rem;
}

.footer-links a {
  color: var(--text-muted);
}

.footer-links a:hover {
  color: var(--text-secondary);
  opacity: 1;
}

.divider {
  width: 100%;
  height: 1px;
  background: var(--border);
  margin: 0.5rem 0 1.5rem;
  max-width: 520px;
}

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

/* ─── Responsive ─── */
@media (max-width: 540px) {
  .header {
    padding: 3rem 1rem 1rem;
  }
  .logo {
    font-size: 1.35rem;
  }
  .card {
    padding: 1.25rem;
  }
  .drop-zone {
    padding: 2rem 1rem;
  }
  .btn-row {
    flex-direction: column;
  }
  .steps {
    grid-template-columns: 1fr;
  }
}