/* ROOT THEME */
:root {
  --navy: #050b1a;
  --navy-soft: #0b1224;
  --navy-deep: #020617;
  --red: #e11d48;
  --blue: #1d4ed8;
  --silver: #9ca3af;
  --white: #f9fafb;
  --border: #1f2937;
  --radius: 10px;
  --shadow: 0 10px 25px rgba(0,0,0,0.5);
  --font-mono: "JetBrains Mono", monospace;
}

body {
  margin: 0;
  background: radial-gradient(circle at top, #111827 0, #020617 45%, #000 100%);
  color: var(--white);
  font-family: system-ui, sans-serif;
  height: 100vh;
  overflow: hidden;
}

.hidden { display: none !important; }

/* LOGIN SCREEN */
.login-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
}

.login-card {
  background: var(--navy-deep);
  padding: 30px;
  border-radius: 16px;
  border: 1px solid var(--silver);
  box-shadow: var(--shadow);
  text-align: center;
}

.login-logo {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  border: 2px solid var(--white);
  margin-bottom: 12px;
}

.login-btn {
  margin-top: 12px;
  width: 100%;
  padding: 10px;
  border-radius: 999px;
  border: 1px solid var(--red);
  background: linear-gradient(90deg, var(--blue), var(--red));
  color: var(--white);
  cursor: pointer;
}

/* APP */
.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

/* TOP NAV */
.top-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--navy-deep);
  padding: 10px 16px;
  border-bottom: 1px solid var(--silver);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-logo {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 2px solid var(--white);
}

.brand-title {
  font-weight: 700;
  text-transform: uppercase;
}

.brand-subtitle {
  font-size: 0.7rem;
  opacity: 0.8;
}

.nav-actions {
  display: flex;
  gap: 8px;
}

.nav-btn {
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--silver);
  background: var(--navy-soft);
  color: var(--white);
  cursor: pointer;
}

.nav-btn-danger {
  border-color: var(--red);
  color: #fee2e2;
}

/* WORKSPACE */
.workspace {
  flex: 1;
  display: grid;
  grid-template-columns: 260px 1.4fr 1.2fr;
  gap: 10px;
  padding: 10px;
}

/* PANELS */
.panel {
  background: var(--navy-soft);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
}

.panel-header {
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  background: var(--navy-deep);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* FOLDER TREE */
.folder-tree {
  padding: 10px;
  overflow-y: auto;
}

.folder {
  margin-bottom: 6px;
}

.folder-name {
  cursor: pointer;
  padding: 6px;
  border-radius: 6px;
  background: var(--navy);
}

.folder-children {
  margin-left: 14px;
  display: none;
}

.file {
  padding: 6px;
  margin: 4px 0;
  border-radius: 6px;
  cursor: pointer;
  background: var(--navy);
}

.file.active {
  background: var(--blue);
}

/* EDITOR */
.editor {
  flex: 1;
  width: 100%;
  border: none;
  outline: none;
  resize: none;
  padding: 12px;
  background: var(--navy);
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

/* PREVIEW */
.preview {
  flex: 1;
  padding: 12px;
  overflow-y: auto;
  background: var(--navy);
}

.preview h1, .preview h2, .preview h3 {
  color: var(--white);
}