:root {
  --bg: #f6f8ff;
  --text: #1d2240;
  --muted: #5a628f;
  --card: #ffffff;
  --border: #d9def5;
  --accent: #3557ff;
  --accent-strong: #2847df;
  --shadow: 0 16px 40px rgba(40, 61, 158, 0.14);
}

body.dark {
  --bg: #121830;
  --text: #f3f5ff;
  --muted: #bac3f6;
  --card: #1a2244;
  --border: #2f3a70;
  --accent: #7f96ff;
  --accent-strong: #91a6ff;
  --shadow: 0 18px 42px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Outfit", sans-serif;
  background: radial-gradient(circle at 10% 12%, #dce4ff 0%, transparent 38%),
    radial-gradient(circle at 88% 20%, #d8fff4 0%, transparent 34%),
    var(--bg);
  color: var(--text);
  transition: background 0.25s ease, color 0.25s ease;
  position: relative;
  overflow-x: hidden;
}

body.dark {
  background: radial-gradient(circle at 10% 12%, #1a2a63 0%, transparent 32%),
    radial-gradient(circle at 88% 20%, #20524c 0%, transparent 32%),
    var(--bg);
}

.bg-shape {
  position: fixed;
  z-index: 0;
  border-radius: 999px;
  filter: blur(45px);
  opacity: 0.4;
  pointer-events: none;
}

.bg-shape-1 {
  width: 260px;
  height: 260px;
  background: #83a6ff;
  top: -60px;
  right: -20px;
}

.bg-shape-2 {
  width: 220px;
  height: 220px;
  background: #77efd1;
  bottom: 0;
  left: -30px;
}

.app-shell {
  width: min(980px, 94vw);
  margin: 2rem auto;
  position: relative;
  z-index: 1;
}

.top-bar {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
}

.brand-block {
  display: flex;
  flex-direction: column;
  gap: 0.22rem;
}

.app-logo {
  width: 78px;
  height: 78px;
  object-fit: cover;
  border-radius: 18px;
  box-shadow: 0 14px 30px rgba(18, 28, 84, 0.3);
  animation: logoFloat 5.5s ease-in-out infinite;
}

.eyebrow {
  margin: 0;
  color: var(--muted);
  font-weight: 600;
  letter-spacing: 0.03em;
}

h1,
h2 {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-size: clamp(1.8rem, 4vw, 2.3rem);
}

.theme-btn,
.primary-btn,
.secondary-btn {
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--card);
  color: var(--text);
  font-family: inherit;
  font-weight: 600;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: transform 0.34s cubic-bezier(0.22, 1, 0.36, 1),
    background 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease,
    filter 0.25s ease;
  will-change: transform, box-shadow;
  animation: buttonFloat 4.8s ease-in-out infinite;
}

.theme-btn::before,
.primary-btn::before,
.secondary-btn::before,
.file-chip::before {
  content: "";
  position: absolute;
  inset: -38%;
  border-radius: inherit;
  background: radial-gradient(
    circle at 20% 20%,
    color-mix(in srgb, var(--accent), transparent 80%) 0%,
    transparent 65%
  );
  opacity: 0;
  transform: translate3d(-10%, 0, 0) scale(0.85);
  transition: opacity 0.35s ease;
  animation: glowDrift 7s ease-in-out infinite;
  pointer-events: none;
}

.theme-btn::after,
.primary-btn::after,
.secondary-btn::after,
.file-chip::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(
    120deg,
    transparent 12%,
    rgba(255, 255, 255, 0.35) 45%,
    transparent 78%
  );
  transform: translateX(-140%);
  transition: transform 0.55s ease;
  pointer-events: none;
}

.theme-btn {
  padding: 0.6rem 1rem;
}

.primary-btn {
  background: var(--accent);
  color: #fff;
  border-color: transparent;
  padding: 0.75rem 1.2rem;
  background-image: linear-gradient(
    120deg,
    var(--accent) 0%,
    color-mix(in srgb, var(--accent), #8ecfff 22%) 45%,
    var(--accent-strong) 100%
  );
  background-size: 180% 100%;
}

.secondary-btn {
  padding: 0.45rem 0.9rem;
}

.primary-btn:hover,
.theme-btn:hover,
.secondary-btn:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 10px 22px rgba(40, 61, 158, 0.2);
  filter: brightness(1.03);
  animation-play-state: paused;
}

.primary-btn:hover::before,
.theme-btn:hover::before,
.secondary-btn:hover::before,
.file-chip:hover::before {
  opacity: 1;
}

.primary-btn:hover::after,
.theme-btn:hover::after,
.secondary-btn:hover::after,
.file-chip:hover::after {
  transform: translateX(140%);
}

.primary-btn:active,
.theme-btn:active,
.secondary-btn:active {
  transform: translateY(0) scale(0.97);
  box-shadow: 0 4px 10px rgba(40, 61, 158, 0.16);
  transition-duration: 0.12s;
}

.theme-btn:focus-visible,
.primary-btn:focus-visible,
.secondary-btn:focus-visible,
.file-chip:focus-visible {
  outline: none;
  animation: buttonPulse 0.45s ease;
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent), transparent 65%),
    0 0 0 8px color-mix(in srgb, var(--accent), transparent 87%);
}

.primary-btn.click-burst,
.secondary-btn.click-burst {
  animation: clickBurst 0.45s cubic-bezier(0.18, 0.89, 0.32, 1.28);
}

.primary-btn.is-loading {
  animation: loadingFlow 1.05s linear infinite, buttonFloat 4.8s ease-in-out infinite;
  cursor: progress;
}

.danger-btn {
  border-color: #ef9fa8;
  color: #b52f3e;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.input-card {
  margin-top: 1.3rem;
  padding: 1rem;
}

.files-card {
  margin-top: 1.3rem;
  padding: 1rem;
}

.summarize-mode-card {
  margin-top: 1rem;
  padding: 1rem;
}

.mode-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 0.7rem;
}

.mode-option {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--text);
  font-weight: 500;
}

.mode-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
}

body.dark .mode-btn.active {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
  color: #101937;
}

.article-row {
  display: flex;
  gap: 0.6rem;
  align-items: center;
}

#articleUrlInput {
  flex: 1;
  min-width: 0;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  padding: 0.68rem 0.75rem;
  font-family: inherit;
}

#articleUrlInput:focus {
  outline: 2px solid color-mix(in srgb, var(--accent), transparent 55%);
}

.hidden {
  display: none !important;
}

.files-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.7rem;
  margin-bottom: 0.7rem;
}

.files-header h2 {
  margin: 0;
}

.file-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.files-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 0.6rem;
}

.file-chip {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  border-radius: 12px;
  padding: 0.55rem 0.7rem;
  text-align: left;
  cursor: pointer;
  font-family: inherit;
  position: relative;
  overflow: hidden;
  transition: transform 0.32s cubic-bezier(0.22, 1, 0.36, 1),
    border-color 0.25s ease, background 0.25s ease, box-shadow 0.25s ease;
  animation: buttonFloat 5.5s ease-in-out infinite;
  animation-delay: 0.15s;
}

.file-chip:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 15px rgba(40, 61, 158, 0.12);
  animation-play-state: paused;
}

.file-chip.active {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent), transparent 88%);
  animation: activeChipIn 0.3s ease;
}

.input-label {
  display: block;
  margin-bottom: 0.6rem;
  font-weight: 600;
}

textarea {
  width: 100%;
  min-height: 190px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: transparent;
  color: inherit;
  padding: 0.8rem;
  font-family: inherit;
  resize: vertical;
}

.results-grid {
  margin-top: 1.3rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.1rem;
}

.result-card {
  padding: 1rem 1.2rem;
  border-radius: 26px;
  min-height: 180px;
}

.result-card h2 {
  margin: 0 0 0.8rem;
  font-size: clamp(1.5rem, 2.2vw, 2rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.result-card:nth-child(3) {
  grid-column: 1;
  min-height: 190px;
}

.result-list {
  margin: 0;
  padding-left: 1.35rem;
  font-size: 1.05rem;
  line-height: 1.5;
}

.result-list li + li {
  margin-top: 0.55rem;
}

.ordered-list {
  padding-left: 1.6rem;
}

@media (max-width: 900px) {
  .results-grid {
    grid-template-columns: 1fr;
  }

  .result-card:nth-child(3) {
    grid-column: auto;
  }
}