/* ── Variables ─────────────────────────────────────────────────────────────── */
:root {
  --primary:       #4F46E5;
  --primary-dark:  #3730A3;
  --primary-light: #E0E7FF;
  --accent:        #7C3AED;
  --bg:            #C7D2E6;
  --card-bg:       #FFFFFF;
  --header-bg:     #1E293B;
  --text:          #0F172A;
  --text-muted:    #475569;
  --border:        #94A3B8;
  --success:       #15803D;
  --success-light: #DCFCE7;
  --error:         #DC2626;
  --error-light:   #FEE2E2;
  --shadow-sm:     0 1px 4px rgba(0,0,0,.15);
  --shadow-md:     0 4px 16px rgba(0,0,0,.18), 0 1px 4px rgba(0,0,0,.1);
  --shadow-lg:     0 12px 36px rgba(0,0,0,.22), 0 4px 12px rgba(0,0,0,.1);
  --radius:        14px;
  --radius-sm:     8px;
  --transition:    0.18s ease;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 15px;
  color: var(--text);
  background: linear-gradient(160deg, #B8C8E0 0%, #C7D2E6 50%, #B0BFD8 100%);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── Layout helpers ────────────────────────────────────────────────────────── */
.container        { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
.container-narrow { max-width: 720px; }

.text-muted { color: var(--text-muted); font-size: 0.88rem; }

/* ── Buttons ───────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition), opacity var(--transition);
  text-decoration: none;
  white-space: nowrap;
  line-height: 1.2;
}
.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 2px 8px rgba(91,91,214,.35);
}
.btn-primary:hover:not(:disabled) {
  background: var(--primary-dark);
  box-shadow: 0 4px 14px rgba(91,91,214,.45);
}
.btn-primary:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  box-shadow: none;
}

.btn-secondary {
  background: var(--card-bg);
  color: var(--text);
  border: 1.5px solid var(--border);
}
.btn-secondary:hover {
  background: var(--bg);
  border-color: #CBD5E1;
}

.btn-ghost {
  background: rgba(255,255,255,.12);
  color: #CBD5E1;
  font-weight: 500;
  font-size: 0.88rem;
  padding: 8px 14px;
  border: 1px solid rgba(255,255,255,.2);
}
.btn-ghost:hover { background: rgba(255,255,255,.22); color: #F1F5F9; }

.btn-full { width: 100%; justify-content: center; padding: 14px 24px; font-size: 1rem; }

/* ── Cards ─────────────────────────────────────────────────────────────────── */
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow-md);
  border: 1.5px solid #8898AA;
  animation: fadeUp 0.3s ease;
}
.card + .card { margin-top: 20px; }

.card-header { margin-bottom: 24px; }
.card-header h2 { font-size: 1.25rem; font-weight: 700; margin-bottom: 4px; color: #0F172A; }
.card-header p  { color: #475569; font-size: 0.9rem; }

.card-success {
  border-color: #86EFAC;
  background: linear-gradient(135deg, #F0FDF4 0%, #FFFFFF 50%);
  text-align: center;
}
.card-error {
  border-color: #FCA5A5;
  background: linear-gradient(135deg, #FFF5F5 0%, #FFFFFF 50%);
  text-align: center;
}

/* ── Header ────────────────────────────────────────────────────────────────── */
.header {
  background: var(--header-bg);
  border-bottom: 1px solid #0F172A;
  box-shadow: 0 2px 8px rgba(0,0,0,.3);
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: #F1F5F9; }
.brand-name { font-weight: 700; font-size: 1.05rem; letter-spacing: -0.01em; color: #F1F5F9; }

/* ── Brand icon ────────────────────────────────────────────────────────────── */
.brand-icon, .brand-icon-sm {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary);
  color: #fff;
  border-radius: 10px;
}
.brand-icon    { width: 48px; height: 48px; border-radius: 14px; margin: 0 auto 16px; }
.brand-icon-sm { width: 36px; height: 36px; border-radius: 9px; }

/* ── Main content ──────────────────────────────────────────────────────────── */
.main { padding: 36px 0 60px; }

/* ── Drop zone ─────────────────────────────────────────────────────────────── */
.drop-zone {
  border: 2px dashed #7A8FA8;
  border-radius: var(--radius-sm);
  padding: 36px 24px;
  text-align: center;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition);
  margin-bottom: 24px;
  user-select: none;
  background: #F8FAFD;
}
.drop-zone:hover,
.drop-zone.drag-over {
  border-color: var(--primary);
  background: var(--primary-light);
}
.drop-zone:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }

.dz-icon {
  width: 64px; height: 64px;
  background: var(--bg);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 14px;
  color: var(--text-muted);
  transition: background var(--transition), color var(--transition);
}
.drop-zone:hover .dz-icon,
.drop-zone.drag-over .dz-icon { background: var(--primary-light); color: var(--primary); }

.dz-title  { font-weight: 600; font-size: 1rem; margin-bottom: 4px; }
.dz-sub    { color: var(--text-muted); font-size: 0.88rem; margin-bottom: 8px; }
.dz-link   { color: var(--primary); font-weight: 600; }
.dz-types  { color: #94A3B8; font-size: 0.78rem; margin-top: 8px; }

.dz-file-info {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 8px 16px;
  background: var(--bg);
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
  cursor: default;
  text-align: left;
}
.file-thumb {
  width: 44px; height: 44px; flex-shrink: 0;
  background: var(--primary-light);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  color: var(--primary);
}
.file-meta    { flex: 1; min-width: 0; }
.file-name-text { display: block; font-weight: 600; font-size: 0.92rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.file-size-text { display: block; color: var(--text-muted); font-size: 0.8rem; margin-top: 2px; }

.file-clear {
  flex-shrink: 0;
  width: 28px; height: 28px;
  border: none; background: transparent;
  color: var(--text-muted); cursor: pointer;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  transition: background var(--transition), color var(--transition);
}
.file-clear:hover { background: #FEE2E2; color: var(--error); }

/* ── Settings row ──────────────────────────────────────────────────────────── */
.settings-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 24px;
}
@media (max-width: 540px) { .settings-row { grid-template-columns: 1fr; } }

.form-group { display: flex; flex-direction: column; gap: 8px; }
.form-group label {
  font-size: 0.83rem;
  font-weight: 600;
  color: #374151;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  display: flex; align-items: center; gap: 5px;
}

.select-wrapper { position: relative; }
.select-wrapper select {
  width: 100%;
  appearance: none;
  padding: 10px 36px 10px 13px;
  border: 1.5px solid #94A3B8;
  border-radius: var(--radius-sm);
  background: #F8FAFD;
  font-size: 0.92rem;
  color: var(--text);
  cursor: pointer;
  transition: border-color var(--transition);
  font-family: inherit;
}
.select-wrapper select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(91,91,214,.15);
}
.select-arrow {
  position: absolute;
  right: 12px; top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

/* ── Quality toggle ────────────────────────────────────────────────────────── */
.quality-toggle {
  display: flex;
  gap: 8px;
}
.quality-btn {
  flex: 1;
  display: flex; flex-direction: column; align-items: center;
  padding: 10px 12px;
  border: 1.5px solid #94A3B8;
  border-radius: var(--radius-sm);
  background: #F8FAFD;
  cursor: pointer;
  font-size: 0.88rem;
  font-weight: 600;
  color: #475569;
  transition: all var(--transition);
  font-family: inherit;
  line-height: 1.3;
}
.quality-btn .quality-hint {
  font-size: 0.72rem;
  font-weight: 400;
  color: inherit;
  margin-top: 2px;
}
.quality-btn.active {
  border-color: var(--primary);
  background: var(--primary-light);
  color: var(--primary);
}
.quality-btn:hover:not(.active) { border-color: #CBD5E1; background: var(--bg); color: var(--text); }

/* ── Progress section ──────────────────────────────────────────────────────── */
.progress-header {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 28px;
}
.progress-header h2    { font-size: 1.1rem; font-weight: 700; }
.progress-header p     { font-size: 0.88rem; color: var(--text-muted); margin-top: 3px; }

/* Spinner */
.spinner {
  width: 36px; height: 36px; flex-shrink: 0;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

/* Steps */
.steps {
  display: flex;
  align-items: center;
  gap: 0;
  margin-bottom: 20px;
  overflow-x: auto;
  padding-bottom: 4px;
}
.step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}
.step span {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  transition: color var(--transition);
  white-space: nowrap;
}
.step-dot {
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--border);
  border: 2px solid transparent;
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
  position: relative;
}
.step-line {
  flex: 1;
  height: 2px;
  background: var(--border);
  min-width: 24px;
  margin-bottom: 22px;
  transition: background var(--transition);
}

/* Step states */
.step.done .step-dot {
  background: var(--success);
  border-color: var(--success);
}
.step.done .step-dot::after {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='10' height='10' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3' xmlns='http://www.w3.org/2000/svg'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E") center/10px no-repeat;
}
.step.done span { color: var(--success); }
.step.done ~ .step-line { background: var(--success); }

.step.active .step-dot {
  background: var(--primary);
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(91,91,214,.2);
  animation: pulse-dot 1.2s ease-in-out infinite;
}
.step.active span { color: var(--primary); }

/* Progress bar */
.progress-track {
  width: 100%;
  height: 8px;
  background: var(--border);
  border-radius: 99px;
  overflow: hidden;
  margin-bottom: 10px;
}
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 99px;
  width: 0%;
  transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}
.progress-fill::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent 0%, rgba(255,255,255,0.3) 50%, transparent 100%);
  animation: shimmer 1.5s ease-in-out infinite;
}
.progress-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.83rem;
}
#progress-pct { font-weight: 700; color: var(--primary); }

/* ── Result section ────────────────────────────────────────────────────────── */
.result-icon {
  width: 64px; height: 64px;
  background: var(--success-light);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 16px;
  color: var(--success);
  animation: popIn 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.card-success h2  { font-size: 1.25rem; font-weight: 700; margin-bottom: 6px; }
.result-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 24px;
}

/* ── Error section ─────────────────────────────────────────────────────────── */
.error-icon {
  width: 64px; height: 64px;
  background: var(--error-light);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 16px;
  color: var(--error);
}
.card-error h2  { font-size: 1.25rem; font-weight: 700; margin-bottom: 6px; }
.card-error .btn-secondary { margin-top: 16px; }

/* ── Login page ────────────────────────────────────────────────────────────── */
.login-body {
  background: #0F172A;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}
.login-bg-blobs { position: absolute; inset: 0; pointer-events: none; }
.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.35;
}
.blob-1 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, #5B5BD6, transparent);
  top: -150px; left: -150px;
}
.blob-2 {
  width: 400px; height: 400px;
  background: radial-gradient(circle, #8B5CF6, transparent);
  bottom: -120px; right: -100px;
}

.login-wrapper {
  position: relative;
  z-index: 1;
  width: 100%;
  padding: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.login-card {
  background: #FFFFFF;
  border-radius: 20px;
  padding: 44px 40px;
  width: 100%;
  max-width: 400px;
  box-shadow: 0 24px 60px rgba(0,0,0,.5), 0 0 0 1px rgba(255,255,255,.15);
  animation: fadeUp 0.4s ease;
}
.login-brand {
  text-align: center;
  margin-bottom: 32px;
}
.login-brand h1 {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 6px;
  color: #0F172A;
}
.login-brand p {
  font-size: 0.88rem;
  color: #475569;
  line-height: 1.5;
}

.login-form { display: flex; flex-direction: column; gap: 20px; color: #0F172A; }

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}
.input-icon {
  position: absolute;
  left: 13px;
  color: var(--text-muted);
  pointer-events: none;
}
.input-wrapper input {
  width: 100%;
  padding: 12px 44px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-family: inherit;
  color: var(--text);
  background: var(--card-bg);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.input-wrapper input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(91,91,214,.15);
}
.toggle-pw {
  position: absolute;
  right: 12px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  display: flex;
  padding: 4px;
  border-radius: 4px;
  transition: color var(--transition);
}
.toggle-pw:hover { color: var(--text); }

.form-error {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 12px;
  background: var(--error-light);
  border: 1px solid #FCA5A5;
  border-radius: 6px;
  color: var(--error);
  font-size: 0.85rem;
  font-weight: 500;
  animation: shake 0.35s ease;
}

/* ── Keyframes ─────────────────────────────────────────────────────────────── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes spin {
  to { transform: rotate(360deg); }
}
@keyframes shimmer {
  0%   { transform: translateX(-100%); }
  100% { transform: translateX(200%); }
}
@keyframes pulse-dot {
  0%, 100% { box-shadow: 0 0 0 4px rgba(91,91,214,.2); }
  50%       { box-shadow: 0 0 0 7px rgba(91,91,214,.1); }
}
@keyframes popIn {
  from { opacity: 0; transform: scale(0.6); }
  to   { opacity: 1; transform: scale(1); }
}
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%       { transform: translateX(-6px); }
  40%       { transform: translateX(6px); }
  60%       { transform: translateX(-4px); }
  80%       { transform: translateX(4px); }
}