/* =======================
   MAIN LAYOUT & BACKGROUND
   ======================= */
:root {
  --ui-bg: #e7ecf3;
  --ui-bg-gradient: linear-gradient(135deg, #e7ecf3 60%, #e2eafc 100%);
  --card-radius: 20px;
  --card-shadow: 0 6px 40px rgba(44, 62, 80, 0.12);
  --main-padding: 2rem;
  --accent: #395bdf;
  --accent-dark: #2d4063;
  --danger: #f75555;
  --success: #00bb7e;
  --warning: #fbbf24;
  --muted: #a0aec0;
  --table-header: #e0eafc;
  --table-stripe: #f3f6fa;
  --tree-bg: #2d4063;
  --tree-bg-darker: #212d3b;
  --tree-label: #fff;
  --tree-pill-task: #15df89;
  --tree-pill-obj: #fbbf24;
  --pill-shadow: 0 1.5px 8px rgba(44,62,80,0.15);
  --text-main: #222;
}

/* --- THEMES --- */
.theme-light {
  --ui-bg: #e7ecf3;
  --ui-bg-gradient: linear-gradient(135deg, #e7ecf3 60%, #e2eafc 100%);
  --accent: #395bdf;
  --accent-dark: #2d4063;
  --tree-bg: #2d4063;
  --tree-bg-darker: #212d3b;
  --tree-label: #fff;
  --text-main: #222;
  background: var(--ui-bg-gradient);
}
.theme-dark {
  --ui-bg: #20283c;
  --ui-bg-gradient: linear-gradient(135deg, #232b3d 60%, #181e2a 100%);
  --card-shadow: 0 6px 40px rgba(8, 18, 40, 0.14);
  --accent: #aadcff;
  --accent-dark: #181c2b;
  --tree-bg: #232b3d;
  --tree-bg-darker: #181e2a;
  --tree-label: #daf5ff;
  --table-header: #2e3751;
  --table-stripe: #242f43;
  --text-main: #e2e2e2;
  background: var(--ui-bg-gradient);
}
.theme-business {
  --ui-bg: #e7ecf3;
  --ui-bg-gradient: linear-gradient(135deg, #e7ecf3 60%, #e2eafc 100%);
  --accent: #395bdf;
  --accent-dark: #2d4063;
  --tree-bg: #2d4063;
  --tree-bg-darker: #212d3b;
  --tree-label: #fff;
  --text-main: #23263a;
  background: var(--ui-bg-gradient);
}
.theme-playful {
  --ui-bg: #ffeaf8;
  --ui-bg-gradient: linear-gradient(135deg, #fff0f6 80%, #eaf4ff 100%);
  --accent: #f72585;
  --accent-dark: #720026;
  --tree-bg: #f72585;
  --tree-bg-darker: #720026;
  --tree-label: #fff;
  --table-header: #f5b8d0;
  --table-stripe: #ffeaf8;
  --text-main: #3a0ca3;
  background: var(--ui-bg-gradient);
}

/* --- App Background --- */
body {
  margin: 0;
  min-height: 100vh;
  font-family: 'Segoe UI', Arial, sans-serif;
  background: var(--ui-bg-gradient);
  color: var(--text-main, #222);
  display: flex;
  flex-direction: column;
  transition: background 0.3s,color 0.3s;
}

/* =======================
   HEADER
   ======================= */
header {
  text-align: center;
  padding: 2.5rem 1rem 1.2rem 1rem;
  background: transparent;
}
.header-main {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2.1rem;
}
header h1 {
  font-size: 2.15rem;
  color: var(--accent-dark);
  letter-spacing: 2px;
  margin: 0;
  font-weight: 700;
}
.theme-switcher {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
}
.theme-switcher select {
  border-radius: 8px;
  border: 1.5px solid #dbeafe;
  padding: 0.38rem 1.2rem 0.38rem 0.7rem;
  font-size: 1.12rem;
  background: #f5f8ff;
  color: var(--accent-dark);
}
.quote {
  color: var(--accent);
  font-style: italic;
  font-size: 1rem;
  margin-top: 0.75em;
  letter-spacing: 0.02em;
}

/* =======================
   MAIN CARD & LAYOUT
   ======================= */
main {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 1.3rem;
}
.card {
  background: #fff;
  border-radius: var(--card-radius);
  box-shadow: var(--card-shadow);
  max-width: 1750px;
  width: 100%;
  margin: 2rem auto;
  padding: var(--main-padding) 2.2rem 2rem 2.2rem;
  transition: box-shadow 0.22s;
  position: relative;
  color: var(--text-main, #23263a);
}
.card:hover {
  box-shadow: 0 10px 48px rgba(44, 62, 80, 0.18);
}

/* =======================
   HEADER CONTROLS / IMPORT / PROJECT FORM
   ======================= */
.projects-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.9rem;
  margin-bottom: 1.5rem;
}
.import-header {
  display: flex;
  align-items: center;
  gap: 0.7em;
  margin-bottom: 1.2em;
  background: #f5f8ff;
  border-radius: 10px;
  padding: 0.6em 1.2em;
  font-size: 1em;
}
.import-label { font-size: 1.03em; color: #395bdf; font-weight: 600;}
#import-file { font-size: 1em;}
#import-btn { min-width: 70px;}
.import-error { color: #f75555; font-size: 0.98em;}
#project-form {
  display: flex;
  gap: 0.7rem;
}
#project-input, #project-start-date {
  padding: 0.55rem 1.1rem;
  border-radius: 8px;
  border: 1.5px solid #c5cae9;
  font-size: 1.10rem;
  background: #f5f8ff;
  color: var(--text-main, #222);
}
#project-input:focus, #project-start-date:focus { border-color: var(--accent);}
#project-select {
  border-radius: 8px;
  border: 1.5px solid #c5cae9;
  font-size: 1.10rem;
  padding: 0.55rem 1.2rem 0.55rem 1rem;
  background: #f5f8ff;
  color: var(--text-main, #222);
}
.download-btn, #project-form button {
  background: var(--accent);
  color: #fff;
  border: 0;
  border-radius: 8px;
  padding: 0.40rem 1.3rem;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.18s, box-shadow 0.14s, transform 0.13s;
  box-shadow: 0 1.5px 8px rgba(44,62,80,0.08);
}
.download-btn:hover, #project-form button:hover { 
  background: var(--accent-dark); 
  box-shadow: 0 2.5px 14px rgba(44,62,80,0.14);
  transform: translateY(-1px) scale(1.04);
}

/* =======================
   PROJECT SUMMARY
   ======================= */
#project-summary {
  margin-bottom: 1.3em;
  font-size: 1.12em;
  color: var(--accent-dark);
  background: #f4f8ff;
  border-radius: 10px;
  padding: 0.9em 1.4em;
  font-weight: 500;
  box-shadow: 0 1.5px 8px #dde6f3;
}

/* =======================
   TREE (WBS) UI
   ======================= */
.project-tree {
  list-style: none;
  margin: 0;
  padding: 0 0 0 16px;
}
.ptree-node {
  margin: 0.35em 0;
  padding: 0.7em 1.5em 0.7em 1em;
  border-radius: 16px;
  font-size: 1.11em;
  background: var(--tree-bg);
  color: var(--tree-label);
  display: flex;
  align-items: center;
  gap: 0.55rem;
  position: relative;
  min-height: 48px;
  box-shadow: 0 1.5px 8px rgba(44,62,80,0.08);
  border: 1.5px solid var(--tree-bg-darker);
  margin-bottom: 0.7em;
}
.ptree-node:hover {
  background: var(--tree-bg-darker);
  color: #fff;
  border-color: var(--accent);
  box-shadow: 0 3px 20px #395bdf22;
}
.ptree-label {
  flex: 1;
  font-weight: 700;
  font-size: 1.08em;
  letter-spacing: 0.01em;
}
.ptree-type {
  font-size: 0.97em;
  opacity: 0.7;
  padding-left: 0.7em;
  font-weight: 400;
}
.ptree-btn {
  background: none;
  border: none;
  color: var(--danger);
  font-size: 1.15em;
  cursor: pointer;
  margin-left: 0.8rem;
  padding: 0 0.18rem;
  transition: color 0.16s, transform 0.13s;
  z-index: 2;
  position: relative;
}
.ptree-btn:hover, .ptree-btn:focus {
  color: #c0392b;
  transform: scale(1.13);
}
.ptree-actions {
  display: flex;
  gap: 0.5em;
  flex-wrap: wrap;
  align-items: center;
  margin-left: 0.5em;
}
.add-child-btn, .add-objective-btn {
  background: var(--tree-pill-task);
  color: #fff;
  border: 0;
  border-radius: 14px;
  padding: 0.19rem 1.23rem;
  font-size: 0.98rem;
  font-weight: 700;
  cursor: pointer;
  margin-right: 0.1em;
  box-shadow: var(--pill-shadow);
  transition: background 0.16s, color 0.14s;
}
.add-objective-btn {
  background: var(--tree-pill-obj);
  color: #222;
}
.add-child-btn:hover { background: var(--warning); color: #222;}
.add-objective-btn:hover { background: var(--tree-pill-task); color: #fff;}

.ptree-form-row {
  margin: 0.7em 0 0.7em 0;
  display: flex;
  gap: 0.5em;
  flex-wrap: wrap;
  align-items: center;
}
.ptree-form-row input, .ptree-form-row select {
  border-radius: 8px;
  border: 1.5px solid #c5cae9;
  font-size: 1em;
  padding: 0.47em 1em;
  background: #f5f8ff;
  color: var(--text-main, #222);
}
.ptree-form-row input:focus, .ptree-form-row select:focus { border-color: var(--accent);}
.ptree-form-row button {
  border-radius: 10px;
  border: none;
  background: var(--accent);
  color: #fff;
  font-size: 1em;
  font-weight: 600;
  padding: 0.23em 1.1em;
  margin-left: 0.4em;
  box-shadow: var(--pill-shadow);
}
.ptree-form-row button:hover { background: var(--accent-dark);}

footer {
  text-align: center;
  padding: 1.5rem 0 1rem 0;
  font-size: 1rem;
  color: #888;
  margin-top: auto;
  letter-spacing: 0.02em;
  background: transparent;
}
footer a { color: var(--accent); text-decoration: none; font-weight: 600; }
footer a:hover { text-decoration: underline; }

::-webkit-scrollbar-thumb { background: #b6c5d6; border-radius: 7px;}
::-webkit-scrollbar { background: #e0eafc; border-radius: 7px; width: 9px;}
@media (max-width: 1000px) {
  .card { max-width: 97vw; padding: 1.2rem 0.8rem 1rem 0.8rem;}
}
@media (max-width: 600px) {
  header h1 { font-size: 1.3rem; }
  .header-main { flex-direction: column; gap: 0.6rem; }
  .card { padding: 1.1rem 0.5rem 0.8rem 0.5rem; margin: 1rem auto; }
  main { padding: 0.3rem; }
  #project-summary { font-size: 0.97em;}
}