:root {
  color-scheme: dark;
  --bg: #07101b;
  --panel: rgba(12, 22, 35, 0.78);
  --panel-solid: #0d1827;
  --panel-soft: rgba(255, 255, 255, 0.045);
  --line: rgba(143, 182, 232, 0.16);
  --line-strong: rgba(143, 182, 232, 0.28);
  --text: #e7eef8;
  --muted: #91a3bd;
  --faint: #667891;
  --accent: #74b7ff;
  --accent-2: #69e6c4;
  --danger: #ff8a8a;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.28);
  --radius: 18px;
  --sidebar-width: 300px;
  font-family: ui-serif, "Noto Serif SC", "Source Han Serif SC", "Songti SC", Georgia, serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  background:
    radial-gradient(circle at 22% 8%, rgba(82, 153, 255, 0.2), transparent 30%),
    radial-gradient(circle at 80% 0%, rgba(105, 230, 196, 0.12), transparent 24%),
    linear-gradient(180deg, #08111d 0%, #060b13 58%, #040810 100%);
  color: var(--text);
}

button,
textarea,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

.home-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 34px 20px;
}

.home-hero {
  width: min(1120px, 100%);
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(320px, 0.75fr);
  gap: 20px;
  align-items: stretch;
}

.home-copy,
.access-panel,
.sidebar,
.chat-panel {
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.home-copy {
  min-height: 590px;
  border-radius: 28px;
  padding: clamp(28px, 5vw, 58px);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  width: fit-content;
  color: var(--accent);
  font-size: 14px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.brand-mark--small {
  letter-spacing: 0.04em;
  font-size: 13px;
}

.brand-mark__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent-2);
  box-shadow: 0 0 18px rgba(105, 230, 196, 0.85);
}

h1,
h2,
p {
  margin: 0;
}

.home-copy h1 {
  margin-top: 22px;
  max-width: 680px;
  font-size: clamp(38px, 5vw, 68px);
  line-height: 1.04;
  font-weight: 650;
  letter-spacing: 0;
}

.lead {
  margin-top: 22px;
  max-width: 650px;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.85;
}

.model-specs {
  margin-top: 34px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.model-specs div {
  min-height: 82px;
  padding: 15px 16px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.035);
}

.model-specs span {
  display: block;
  color: var(--faint);
  font-size: 12px;
}

.model-specs strong {
  display: block;
  margin-top: 8px;
  color: var(--text);
  font-size: 15px;
  line-height: 1.35;
}

.access-panel {
  position: relative;
  overflow: hidden;
  border-radius: 28px;
  padding: 30px;
  display: grid;
  gap: 22px;
  align-content: center;
}

.access-panel__orb {
  position: absolute;
  inset: auto -80px -100px auto;
  width: 210px;
  height: 210px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(116, 183, 255, 0.24), transparent 68%);
  pointer-events: none;
}

.panel-kicker {
  color: var(--accent);
  font-size: 12px;
  letter-spacing: 0.14em;
}

.access-panel h2 {
  margin-top: 10px;
  font-size: 28px;
}

.access-panel p:not(.panel-kicker) {
  margin-top: 12px;
  color: var(--muted);
  line-height: 1.75;
}

.gate__form {
  display: grid;
  gap: 12px;
}

.input,
.composer {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(1, 7, 14, 0.66);
  color: var(--text);
  padding: 13px 14px;
  outline: none;
}

.input:focus,
.composer:focus {
  border-color: rgba(116, 183, 255, 0.55);
  box-shadow: 0 0 0 4px rgba(116, 183, 255, 0.12);
}

.button,
.icon-button {
  border: 0;
  color: #06101c;
  background: linear-gradient(135deg, #7bc4ff, #69e6c4);
  border-radius: 14px;
  padding: 12px 16px;
  font-weight: 650;
}

.button--ghost {
  width: 100%;
  color: var(--text);
  background: transparent;
  border: 1px solid var(--line);
}

.icon-button {
  width: 36px;
  height: 36px;
  padding: 0;
  font-size: 22px;
}

.error {
  min-height: 20px;
  color: var(--danger);
  font-size: 14px;
}

.tiny {
  color: var(--muted);
  font-size: 13px;
}

.access-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.text-button {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 12px;
  color: var(--accent);
  background: rgba(116, 183, 255, 0.07);
  font-size: 13px;
  transition:
    border-color 160ms ease,
    background 160ms ease,
    transform 160ms ease;
}

.text-button:hover {
  border-color: rgba(116, 183, 255, 0.5);
  background: rgba(116, 183, 255, 0.14);
  transform: translateY(-1px);
}

.compliance-modal[hidden] {
  display: none;
}

.compliance-modal {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  padding: 20px;
}

.compliance-modal__backdrop {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 30% 20%, rgba(116, 183, 255, 0.2), transparent 34%),
    rgba(2, 7, 14, 0.72);
  backdrop-filter: blur(12px);
}

.compliance-modal__panel {
  position: relative;
  width: min(720px, 100%);
  max-height: min(760px, calc(100vh - 40px));
  overflow: auto;
  border: 1px solid var(--line-strong);
  border-radius: 24px;
  background:
    linear-gradient(145deg, rgba(13, 24, 39, 0.96), rgba(8, 17, 29, 0.94)),
    var(--panel-solid);
  box-shadow: 0 34px 90px rgba(0, 0, 0, 0.44);
  padding: clamp(22px, 4vw, 34px);
}

.compliance-modal__close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 36px;
  height: 36px;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.04);
  font-size: 24px;
  line-height: 1;
}

.compliance-modal__close:hover {
  color: var(--text);
  border-color: var(--line-strong);
}

.compliance-modal h2 {
  margin-top: 10px;
  padding-right: 36px;
  font-size: clamp(28px, 4vw, 40px);
}

.compliance-modal__intro {
  margin-top: 14px;
  max-width: 620px;
  color: var(--muted);
  line-height: 1.8;
}

.compliance-grid {
  margin-top: 22px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.compliance-grid div {
  min-height: 86px;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 14px;
  background: rgba(255, 255, 255, 0.035);
}

.compliance-grid span {
  display: block;
  color: var(--faint);
  font-size: 12px;
}

.compliance-grid strong {
  display: block;
  margin-top: 8px;
  color: var(--text);
  font-size: 15px;
  line-height: 1.45;
}

.compliance-copy {
  margin-top: 20px;
  display: grid;
  gap: 12px;
  color: var(--muted);
  line-height: 1.85;
}

.compliance-modal__confirm {
  margin-top: 22px;
  min-width: 140px;
}

.workbench {
  height: 100vh;
  display: grid;
  grid-template-columns: var(--sidebar-width) 8px minmax(0, 1fr);
  padding: 14px;
  gap: 0;
}

.sidebar {
  min-width: 0;
  border-radius: 18px 0 0 18px;
  display: grid;
  grid-template-rows: auto 1fr auto;
  overflow: hidden;
}

.sidebar__top,
.sidebar__foot {
  padding: 16px;
  border-bottom: 1px solid var(--line);
}

.sidebar__top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
}

.sidebar__top p {
  margin-top: 8px;
  color: var(--faint);
  font-size: 12px;
}

.sidebar__foot {
  border-top: 1px solid var(--line);
  border-bottom: 0;
}

.resize-handle {
  background: linear-gradient(180deg, transparent, rgba(116, 183, 255, 0.22), transparent);
  cursor: col-resize;
}

.session-list {
  overflow: auto;
  padding: 10px;
}

.session-item {
  border: 1px solid transparent;
  border-radius: 12px;
  padding: 8px;
  margin-bottom: 8px;
  background: rgba(255, 255, 255, 0.025);
}

.session-item.is-active {
  border-color: var(--line-strong);
  background: rgba(116, 183, 255, 0.1);
}

.session-item__main {
  width: 100%;
  padding: 0;
  border: 0;
  text-align: left;
  color: var(--text);
  background: transparent;
}

.session-item__main span {
  display: block;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.session-item__main small {
  display: block;
  margin-top: 5px;
  color: var(--faint);
}

.session-item__actions {
  margin-top: 8px;
  display: flex;
  gap: 6px;
}

.session-item__actions button {
  flex: 1;
  border: 1px solid var(--line);
  border-radius: 9px;
  padding: 5px 6px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.03);
  font-size: 12px;
}

.chat-panel {
  min-width: 0;
  border-radius: 0 18px 18px 0;
  display: grid;
  grid-template-rows: auto 1fr auto;
  overflow: hidden;
}

.chat-header {
  padding: 18px 22px;
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.chat-header h1 {
  margin-top: 7px;
  font-size: 24px;
  font-weight: 650;
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 14px;
}

.status::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-2);
  box-shadow: 0 0 12px rgba(105, 230, 196, 0.85);
}

.messages {
  overflow: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 22px;
}

.message {
  width: min(760px, 100%);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 13px 15px;
  background: rgba(255, 255, 255, 0.035);
}

.message--user {
  align-self: flex-end;
  border-color: rgba(116, 183, 255, 0.24);
  background: rgba(116, 183, 255, 0.11);
}

.message__role {
  margin-bottom: 8px;
  color: var(--accent);
  font-size: 13px;
}

.message__content {
  white-space: pre-wrap;
  line-height: 1.75;
  font-size: 15px;
}

.message__stats {
  margin-top: 10px;
  color: var(--faint);
  font-size: 12px;
}

.composer-wrap {
  padding: 14px;
  border-top: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.08);
}

.response-stats {
  margin: 0 0 10px 2px;
  color: var(--faint);
  font-size: 13px;
}

.composer-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  align-items: end;
}

.composer {
  min-height: 52px;
  max-height: 170px;
  resize: vertical;
  line-height: 1.55;
}

@media (max-width: 900px) {
  .home-shell {
    place-items: start;
  }

  .home-hero {
    grid-template-columns: 1fr;
  }

  .home-copy {
    min-height: auto;
  }

  .model-specs {
    grid-template-columns: 1fr;
  }

  .access-actions {
    align-items: flex-start;
    flex-direction: column;
  }

  .compliance-grid {
    grid-template-columns: 1fr;
  }

  .compliance-modal__panel {
    border-radius: 20px;
  }

  .workbench {
    height: auto;
    min-height: 100vh;
    grid-template-columns: 1fr;
    grid-template-rows: auto auto 1fr;
    padding: 10px;
  }

  .resize-handle {
    display: none;
  }

  .sidebar,
  .chat-panel {
    border-radius: 16px;
  }

  .sidebar {
    max-height: 260px;
    margin-bottom: 10px;
  }

  .session-list {
    display: flex;
    overflow-x: auto;
    overflow-y: hidden;
  }

  .session-item {
    min-width: 210px;
  }

  .chat-panel {
    min-height: calc(100vh - 290px);
  }

  .chat-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .composer-row {
    grid-template-columns: 1fr;
  }
}