/* Prevent display:flex/block on panels from overriding the [hidden] attribute */
[hidden] { display: none !important; }

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

:root {
  --bg:             #07070D;
  --surface:        #0F0F1A;
  --surface-2:      #161625;
  --border:         rgba(255, 255, 255, 0.07);
  --border-bright:  rgba(255, 255, 255, 0.13);

  --text:           #EDE9FF;
  --text-muted:     #7B7690;
  --text-dim:       #3E3A52;

  --accent:         #F5A523;
  --accent-hover:   #F7B944;
  --accent-dim:     rgba(245, 165, 35, 0.12);
  --accent-glow:    rgba(245, 165, 35, 0.28);

  --success:        #4EE8A0;
  --success-dim:    rgba(78, 232, 160, 0.1);
  --success-border: rgba(78, 232, 160, 0.22);
  --success-glow:   rgba(78, 232, 160, 0.22);

  --error:          #FF5252;
  --error-dim:      rgba(255, 82, 82, 0.1);
  --error-border:   rgba(255, 82, 82, 0.22);

  --radius:         18px;
  --radius-sm:      10px;
  --ease:           cubic-bezier(0.4, 0, 0.2, 1);
}

html, body { height: 100%; }

body {
  font-family: 'DM Sans', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

/* Ambient background glow */
.bg-glow {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(245, 165, 35, 0.07) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 80% 110%, rgba(78, 120, 232, 0.04) 0%, transparent 50%);
}

/* App container */
.app {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 500px;
}

/* ── Header ── */
.header {
  text-align: center;
  margin-bottom: 2rem;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.6rem;
}

.logo-mark {
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, var(--accent) 0%, #F7C96A 100%);
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #1A0F00;
  box-shadow: 0 4px 16px var(--accent-glow);
  flex-shrink: 0;
}

.logo-text {
  font-family: 'Syne', sans-serif;
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text);
}

.tagline {
  font-size: 0.85rem;
  color: var(--text-muted);
  letter-spacing: 0.01em;
}

/* ── Drop Zone ── */
.drop-zone {
  background: var(--surface);
  border: 1.5px dashed var(--border-bright);
  border-radius: var(--radius);
  padding: 2.75rem 2rem 2rem;
  text-align: center;
  cursor: pointer;
  outline: none;
  position: relative;
  overflow: hidden;
  transition:
    border-color 0.25s var(--ease),
    background   0.25s var(--ease),
    box-shadow   0.25s var(--ease),
    transform    0.2s  var(--ease);
}

/* inner glow overlay */
.drop-zone::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(245, 165, 35, 0.06) 0%, transparent 70%);
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
}

.drop-zone:hover::after,
.drop-zone:focus-visible::after {
  opacity: 1;
}

.drop-zone:hover,
.drop-zone:focus-visible {
  border-color: rgba(245, 165, 35, 0.45);
  background: var(--surface-2);
  box-shadow:
    0 0 0 1px rgba(245, 165, 35, 0.08),
    0 24px 64px rgba(0, 0, 0, 0.45);
}

.drop-zone.dragover {
  border-color: var(--accent);
  background: var(--surface-2);
  box-shadow:
    0 0 0 1px rgba(245, 165, 35, 0.18),
    0 0 48px rgba(245, 165, 35, 0.12),
    0 24px 64px rgba(0, 0, 0, 0.5);
  transform: scale(1.012);
}

.drop-zone.dragover::after {
  opacity: 1;
}

/* Upload icon */
.drop-zone__icon {
  display: flex;
  justify-content: center;
  margin-bottom: 1.5rem;
}

.upload-svg {
  color: var(--accent);
  filter: drop-shadow(0 0 10px var(--accent-glow));
  animation: float 3.5s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50%       { transform: translateY(-7px); }
}

.drop-zone.dragover .upload-svg {
  animation: none;
  transform: translateY(-6px) scale(1.08);
  transition: transform 0.25s var(--ease);
}

.drop-zone__primary {
  font-family: 'Syne', sans-serif;
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 0.35rem;
}

.drop-zone__or {
  font-size: 0.75rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 1rem;
}

/* Primary button */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--accent);
  color: #1A0F00;
  border: none;
  border-radius: var(--radius-sm);
  padding: 0.65rem 1.75rem;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition:
    background    0.2s var(--ease),
    box-shadow    0.2s var(--ease),
    transform     0.15s var(--ease);
  letter-spacing: 0.01em;
}

.btn-primary:hover {
  background: var(--accent-hover);
  box-shadow: 0 0 24px var(--accent-glow);
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: translateY(0);
}

.drop-zone__formats {
  font-family: 'DM Mono', monospace;
  font-size: 0.7rem;
  color: var(--text-dim);
  margin-top: 1.5rem;
  line-height: 1.9;
  letter-spacing: 0.04em;
}

.drop-zone__limit {
  font-size: 0.72rem;
  color: var(--text-dim);
  margin-top: 0.35rem;
}

/* ── Shared Panel base ── */
.panel {
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  animation: slideUp 0.3s var(--ease) both;
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Processing panel ── */
.file-row {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding-bottom: 1.25rem;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
}

.file-icon-wrap {
  width: 38px;
  height: 38px;
  background: var(--accent-dim);
  border: 1px solid rgba(245, 165, 35, 0.18);
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  flex-shrink: 0;
}

.file-details { flex: 1; min-width: 0; }

.file-name {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-size {
  display: block;
  font-family: 'DM Mono', monospace;
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

.progress-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.progress-status {
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.45rem;
  transition: color 0.2s;
}

.progress-status.active { color: var(--accent); }

.spinner {
  display: none;
  width: 13px;
  height: 13px;
  border: 1.5px solid var(--accent);
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.65s linear infinite;
  flex-shrink: 0;
}

.progress-status.processing .spinner { display: block; }

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

.progress-pct {
  font-family: 'DM Mono', monospace;
  font-size: 0.75rem;
  color: var(--text-muted);
  min-width: 2.5rem;
  text-align: right;
}

.progress-track {
  height: 3px;
  background: var(--surface-2);
  border-radius: 2px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0;
  border-radius: 2px;
  background: linear-gradient(90deg, #E8920F 0%, var(--accent) 50%, #F7CC6A 100%);
  box-shadow: 0 0 8px var(--accent-glow);
  transition: width 0.25s var(--ease);
}

.progress-fill.done {
  background: linear-gradient(90deg, #2ECF82 0%, var(--success) 100%);
  box-shadow: 0 0 10px var(--success-glow);
}

/* ── Result panel ── */
.panel--success {
  border-color: var(--success-border);
  box-shadow: 0 0 32px rgba(78, 232, 160, 0.07);
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.result-icon {
  width: 46px;
  height: 46px;
  background: var(--success-dim);
  border: 1.5px solid var(--success-border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--success);
  flex-shrink: 0;
  animation: popIn 0.45s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

@keyframes popIn {
  from { transform: scale(0); opacity: 0; }
  to   { transform: scale(1); opacity: 1; }
}

.result-body { flex: 1; min-width: 0; }

.result-title {
  font-family: 'Syne', sans-serif;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}

.result-subtitle {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

.result-actions {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  width: 100%;
  margin-top: 0.25rem;
}

.btn-success {
  background: var(--success);
  color: #021A0C;
  border: none;
  border-radius: var(--radius-sm);
  padding: 0.6rem 1.4rem;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: box-shadow 0.2s, transform 0.15s;
}

.btn-success:hover {
  box-shadow: 0 0 22px var(--success-glow);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border: 1.5px solid var(--border-bright);
  border-radius: var(--radius-sm);
  padding: 0.6rem 1.25rem;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
}

.btn-ghost:hover {
  border-color: rgba(255, 255, 255, 0.28);
  color: var(--text);
}

/* ── Error panel ── */
.panel--error {
  border-color: var(--error-border);
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  animation: shake 0.4s var(--ease), slideUp 0.3s var(--ease) both;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%       { transform: translateX(-6px); }
  40%       { transform: translateX(6px); }
  60%       { transform: translateX(-4px); }
  80%       { transform: translateX(4px); }
}

.error-icon {
  width: 38px;
  height: 38px;
  background: var(--error-dim);
  border: 1.5px solid var(--error-border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--error);
  flex-shrink: 0;
}

.error-body { flex: 1; min-width: 0; }

.error-text {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ── Footer ── */
.footer {
  margin-top: 1.5rem;
  text-align: center;
  font-size: 0.72rem;
  color: var(--text-dim);
  letter-spacing: 0.02em;
}

/* ── Responsive ── */
@media (min-width: 480px) {
  .drop-zone { padding: 3.5rem 2.5rem 2.5rem; }
  .logo-text  { font-size: 1.8rem; }

  .panel--success,
  .panel--error {
    flex-wrap: nowrap;
  }

  .result-actions { width: auto; margin-top: 0; flex-direction: column; }
}