:root {
  --font-base: "Barlow Condensed", "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  --bg: #f3f5f9;
  --panel: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --line: #dbe2ea;
  --accent: #0f766e;
  --accent-soft: #e6fffb;
  --accent-text: #0b4f4a;
  --surface-soft: #fcfdff;
  --surface-list: #fbfdff;
  --hover: #edf2f7;
  --link: #0b4f4a;
  --sidebar-width: 360px;
}

body.dark-mode {
  --bg: #0b1220;
  --panel: #111827;
  --text: #f3f6fb;
  --muted: #c6cfdb;
  --line: #334155;
  --accent: #2dd4bf;
  --accent-soft: #134e4a;
  --accent-text: #d1fae5;
  --surface-soft: #0f172a;
  --surface-list: #1e293b;
  --hover: #1f2937;
  --link: #67e8f9;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  color: var(--text);
  background: var(--bg);
}

body,
button,
input,
select,
textarea {
  font-family: var(--font-base);
}

h1,
h2,
h3,
h4,
h5,
h6 {
  letter-spacing: 0.2px;
}

.login-screen {
  position: relative;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 20px;
  overflow: hidden;
}

.login-screen[hidden] {
  display: none !important;
}

.login-transition-layer {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
}

#loginTransitionImage {
  position: fixed;
  object-fit: cover;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.28);
  border-radius: 12px;
  opacity: 0;
}

.login-card {
  position: relative;
  z-index: 2;
  width: min(420px, 92vw);
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: 0 16px 34px rgba(15, 23, 42, 0.2);
  padding: 24px;
  display: grid;
  gap: 10px;
  transition: opacity 260ms ease;
}

.login-card h1 {
  margin: 0;
  font-size: 34px;
}

.login-card p {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 20px;
}

.login-card label {
  font-size: 18px;
  font-weight: 600;
}

.login-card input {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--surface-soft);
  color: var(--text);
  padding: 10px 12px;
  font-size: 20px;
}

.login-card input:focus {
  outline: none;
  border-color: var(--accent);
}

.login-error {
  color: #dc2626;
  min-height: 24px;
}

.login-submit {
  margin-top: 6px;
  border: 1px solid transparent;
  background: var(--accent);
  color: #ffffff;
  font-size: 20px;
  padding: 10px 12px;
  cursor: pointer;
}

.login-submit:hover {
  filter: brightness(1.05);
}

.login-screen.is-animating .login-card {
  opacity: 1;
}

.app {
  min-height: 100vh;
  display: flex;
}

.app[hidden] {
  display: none !important;
}

.menu-toggle {
  position: fixed;
  top: 18px;
  left: 18px;
  z-index: 30;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(255, 255, 255, 0.75);
  border-radius: 10px;
  background: rgba(15, 23, 42, 0.58);
  color: #ffffff;
  backdrop-filter: blur(3px);
  cursor: pointer;
  font-size: 20px;
  line-height: 1;
}

.menu-toggle:hover {
  background: rgba(15, 23, 42, 0.72);
}

.theme-toggle {
  position: fixed;
  top: 18px;
  right: 18px;
  z-index: 30;
  width: 52px;
  height: 44px;
  border: 1px solid rgba(255, 255, 255, 0.75);
  border-radius: 999px;
  background: linear-gradient(140deg, rgba(15, 23, 42, 0.7), rgba(30, 41, 59, 0.55));
  color: #ffffff;
  backdrop-filter: blur(3px);
  cursor: pointer;
  font-size: 18px;
  line-height: 1;
  box-shadow: 0 6px 18px rgba(2, 6, 23, 0.28);
  display: grid;
  place-items: center;
  padding: 0;
  transition: transform 180ms ease, box-shadow 200ms ease, background 200ms ease;
}

.theme-toggle:hover {
  transform: translateY(-1px);
  background: linear-gradient(140deg, rgba(15, 23, 42, 0.82), rgba(30, 41, 59, 0.7));
  box-shadow: 0 10px 22px rgba(2, 6, 23, 0.36);
}

.theme-toggle:active {
  transform: translateY(0);
}

.theme-icon {
  position: absolute;
  transition: opacity 180ms ease, transform 220ms ease;
}

.theme-icon.sun {
  opacity: 0;
  transform: scale(0.85) rotate(-20deg);
}

.theme-toggle.is-dark .theme-icon.sun {
  opacity: 1;
  transform: scale(1) rotate(0deg);
}

.theme-toggle.is-dark .theme-icon.moon {
  opacity: 0;
  transform: scale(0.85) rotate(20deg);
}

.sidebar {
  width: var(--sidebar-width);
  background: var(--panel);
  border-right: 1px solid var(--line);
  overflow-y: auto;
  padding: 0 0 16px;
  margin-left: 0;
  transition: transform 220ms ease, margin-left 220ms ease, width 220ms ease;
}

.app.sidebar-hidden .sidebar {
  transform: translateX(calc(-1 * var(--sidebar-width)));
  margin-left: calc(-1 * var(--sidebar-width));
}

.sidebar-header {
  padding: 0 16px 12px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.sidebar-image-wrap {
  position: relative;
  width: 100%;
  border-radius: 0 0 12px 12px;
  overflow: hidden;
  margin-bottom: 12px;
}

.sidebar-image {
  width: 100%;
  height: 260px;
  object-fit: cover;
  display: block;
}

.sidebar-image-title {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 12px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  color: #ffffff;
  font-weight: 700;
  align-items: center;
  text-align: center;
  letter-spacing: 0.2px;
  text-transform: uppercase;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.7);
}

.sidebar-image-title span {
  line-height: 1;
}

.sidebar-image-title span:first-child {
  font-size: 23px;
}

.sidebar-image-title span:last-child {
  font-size: 27px;
}

.sidebar-header p {
  margin: 0;
  color: var(--muted);
  font-size: 16px;
  letter-spacing: 0.2px;
}

.logout-button {
  margin-top: 10px;
  border: 1px solid var(--line);
  background: var(--surface-soft);
  color: var(--text);
  font-size: 16px;
  padding: 6px 10px;
  cursor: pointer;
}

.logout-button:hover {
  background: var(--hover);
}

.menu {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 0 16px;
}

.menu-group {
  border: 1px solid var(--line);
  border-radius: 0;
  overflow: hidden;
  background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
  box-shadow: 0 10px 22px rgba(15, 23, 42, 0.16);
  transition: transform 180ms ease, box-shadow 200ms ease, border-color 200ms ease;
}

.menu-group:hover {
  transform: translateY(-2px) translateX(1px);
  box-shadow: 0 14px 28px rgba(15, 23, 42, 0.24);
  border-color: #b8c5d8;
}

body.dark-mode .menu-group {
  background: linear-gradient(180deg, #1d2738 0%, #131c2a 100%);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.42);
  border-color: #3f5168;
}

body.dark-mode .menu-group:hover {
  box-shadow: 0 16px 30px rgba(0, 0, 0, 0.52);
  border-color: #55708e;
}

.menu-main {
  width: 100%;
  text-align: left;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text);
  padding: 10px 12px;
  font-weight: 700;
  letter-spacing: 0.2px;
  cursor: pointer;
}

.menu-main.active {
  background: var(--accent-soft);
  color: var(--accent-text);
}

.submenu {
  border-top: 0;
  margin: 6px 8px 8px 12px;
  padding: 2px 0 2px 10px;
  display: none;
  flex-direction: column;
  gap: 4px;
  border-left: 2px solid var(--line);
}

.menu-group:has(.submenu.open),
.menu-group:has(.submenu.open):hover {
  border-color: transparent;
  box-shadow: none;
  background: transparent;
  transform: none;
}

body.dark-mode .menu-group:has(.submenu.open),
body.dark-mode .menu-group:has(.submenu.open):hover {
  border-color: transparent;
  box-shadow: none;
  background: transparent;
  transform: none;
}

.menu-group:has(.submenu.open) .menu-main {
  border-color: var(--line);
}

.submenu.open {
  display: flex;
}

.submenu button {
  border: 0;
  background: transparent;
  text-align: left;
  padding: 7px 8px;
  border-radius: 7px;
  cursor: pointer;
  color: var(--text);
  font-weight: 500;
  letter-spacing: 0.15px;
}

.submenu button:hover {
  background: var(--hover);
}

.submenu button.selected {
  background: var(--accent-soft);
  color: var(--accent-text);
}

.content {
  flex: 1;
  padding: 80px 24px 24px;
  margin-left: 0;
  transition: margin-left 220ms ease;
}

.content-panel {
  max-width: 1000px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px;
}

.content-panel h2 {
  margin-top: 0;
}

.content-panel p {
  color: var(--muted);
  margin-bottom: 18px;
  font-size: 20px;
}

.content-list {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 8px;
}

.content-list li {
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-list);
  font-size: 20px;
}

.content-embed {
  margin-bottom: 16px;
}

.content-embed-note {
  margin: 0 0 10px;
  color: var(--muted);
}

.content-embed-frame {
  width: 100%;
  height: 72vh;
  min-height: 520px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
}

.content-embed-link {
  display: inline-block;
  margin-top: 10px;
  color: var(--link);
  font-weight: 600;
  text-decoration: none;
}

.content-embed-link:hover {
  text-decoration: underline;
}

@media (max-width: 860px) {
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    z-index: 20;
  }

  .content {
    padding: 72px 14px 18px;
  }

  .content-embed-frame {
    height: 68vh;
    min-height: 440px;
  }
}