:root {
  --acc-rgb: 25, 227, 255;
  --cy: rgb(var(--acc-rgb));
  --cy-dim: rgba(var(--acc-rgb), .55);
  --cy-faint: rgba(var(--acc-rgb), .14);
  --cy-glow: rgba(var(--acc-rgb), .55);
  --bg: #02060c;
  --panel-rgb: 4, 16, 28;
  --panel: rgba(var(--panel-rgb), .72);
  --panel-brd: rgba(var(--acc-rgb), .28);
  --txt-hi: #eafcff;
  --txt-md: #cdf3ff;
  --txt-soft: #bdefff;
  --on-acc: #02121c;
  --ok: #3ef58c;
  --bad: #ff5d6c;
  --mono: 'Consolas', 'Courier New', monospace;
}

html, body { background: var(--bg); color: var(--txt-md); }
body { font-family: var(--mono); letter-spacing: .35px; }
button, textarea { font-family: var(--mono); }
button:focus-visible, a:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--cy); outline-offset: 2px;
}

#stars { position: fixed; inset: 0; z-index: 0; pointer-events: none; }
.nebula {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(ellipse 60% 40% at 70% 75%, rgba(20, 90, 160, .22), transparent 60%),
    radial-gradient(ellipse 50% 35% at 20% 20%, rgba(10, 60, 120, .18), transparent 60%),
    radial-gradient(ellipse 80% 60% at 50% 110%, rgba(30, 140, 200, .12), transparent 70%);
}
.scanlines {
  position: fixed; inset: 0; z-index: 80; pointer-events: none;
  background: repeating-linear-gradient(0deg, transparent 0 2px, rgba(0, 0, 0, .14) 2px 4px);
  mix-blend-mode: multiply;
}
.vignette {
  position: fixed; inset: 0; z-index: 79; pointer-events: none;
  background: radial-gradient(ellipse at center, transparent 55%, rgba(0, 0, 0, .55) 100%);
}

/* StudyMate shell using AJAX's HUD materials. */
body.studymate-app #sidebar,
body.studymate-app #main { position: relative; z-index: 10; }
body.studymate-app #sidebar {
  background: linear-gradient(180deg, rgba(6, 20, 34, .88), rgba(2, 8, 15, .76));
  border-right: 1px solid var(--panel-brd);
  box-shadow: 12px 0 38px rgba(0, 0, 0, .34);
  backdrop-filter: blur(8px);
}
body.studymate-app #sidebar-header,
body.studymate-app #chat-header,
body.studymate-app #composer,
body.studymate-app #sidebar-footer { border-color: var(--panel-brd); }
body.studymate-app #sidebar-header h1 {
  color: var(--txt-hi); text-transform: uppercase; letter-spacing: 2px;
  text-shadow: 0 0 14px var(--cy-glow);
}
body.studymate-app #sidebar-header h1::before {
  content: ''; display: inline-block; width: 10px; height: 10px; margin-right: 9px;
  border: 1px solid var(--cy); border-radius: 50%; background: var(--cy-faint);
  box-shadow: 0 0 9px var(--cy-glow), inset 0 0 5px var(--cy-glow);
}
body.studymate-app #sidebar-header .subjects,
body.studymate-app #sidebar-footer { color: var(--cy-dim); letter-spacing: .8px; }
body.studymate-app #new-chat-btn,
body.studymate-app #send {
  color: var(--on-acc); background: var(--cy); border-radius: 2px;
  box-shadow: 0 0 12px rgba(var(--acc-rgb), .3); text-transform: uppercase;
  letter-spacing: 1.2px; font-weight: 700;
}
body.studymate-app #new-chat-btn:hover,
body.studymate-app #send:hover { background: var(--txt-hi); box-shadow: 0 0 18px var(--cy-glow); }
body.studymate-app .log-item { border-radius: 2px; border-left: 2px solid transparent; }
body.studymate-app .log-item:hover { background: var(--cy-faint); border-left-color: var(--cy-dim); }
body.studymate-app .log-item.active { background: rgba(var(--acc-rgb), .12); border-left-color: var(--cy); color: var(--txt-hi); }
body.studymate-app #switch-profile { color: var(--cy); }
body.studymate-app #main { background: rgba(2, 7, 13, .34); }
body.studymate-app #chat-header {
  background: linear-gradient(180deg, rgba(6, 20, 34, .78), rgba(6, 20, 34, .3));
  backdrop-filter: blur(5px);
}
body.studymate-app #chat-header .title { color: var(--txt-hi); letter-spacing: 1px; }
body.studymate-app #progress-btn,
body.studymate-app #close-progress {
  color: var(--cy); background: rgba(var(--panel-rgb), .8); border-color: var(--panel-brd);
  border-radius: 2px; text-transform: uppercase; letter-spacing: 1px;
}
body.studymate-app #progress-btn:hover,
body.studymate-app #close-progress:hover { background: var(--cy-faint); box-shadow: 0 0 12px rgba(var(--acc-rgb), .2); }
body.studymate-app #messages { scrollbar-color: var(--cy-dim) transparent; }
body.studymate-app .msg { border-radius: 2px; }
body.studymate-app .msg.assistant {
  color: var(--txt-md); background: rgba(var(--panel-rgb), .78); border: 1px solid var(--panel-brd);
  border-left: 2px solid var(--cy-dim); box-shadow: 0 8px 24px rgba(0, 0, 0, .22);
}
body.studymate-app .msg.user {
  color: var(--txt-hi); background: rgba(var(--acc-rgb), .16); border: 1px solid var(--panel-brd);
  border-right: 2px solid var(--cy); box-shadow: 0 0 15px rgba(var(--acc-rgb), .08);
}
body.studymate-app .msg.system-note { color: var(--ok); }
body.studymate-app #empty-state { color: var(--cy-dim); }
body.studymate-app #input {
  color: var(--txt-hi); background: rgba(var(--panel-rgb), .86); border-color: var(--panel-brd);
  border-radius: 2px; box-shadow: inset 0 0 18px rgba(0, 0, 0, .2);
}
body.studymate-app #input:focus { outline: 1px solid var(--cy); box-shadow: 0 0 12px rgba(var(--acc-rgb), .18); }
body.studymate-app #progress-overlay { z-index: 90; backdrop-filter: blur(5px); }
body.studymate-app #progress-panel {
  color: var(--txt-md); background: rgba(var(--panel-rgb), .96); border-color: var(--panel-brd);
  border-radius: 3px; box-shadow: 0 0 34px rgba(var(--acc-rgb), .15), 0 22px 70px rgba(0, 0, 0, .55);
}
body.studymate-app #progress-panel h2,
body.studymate-app .subject-card h3 { color: var(--txt-hi); }
body.studymate-app .subject-card { background: rgba(var(--acc-rgb), .04); border-color: var(--panel-brd); border-radius: 2px; }
body.studymate-app .bar-track { background: rgba(var(--acc-rgb), .1); }
body.studymate-app .bar-fill { background: linear-gradient(90deg, var(--cy-dim), var(--cy)); box-shadow: 0 0 8px var(--cy-glow); }

/* Profile selector, now part of the same visual family. */
body.profile-select { overflow: hidden; }
body.profile-select main { position: relative; z-index: 10; }
body.profile-select h1 {
  color: var(--txt-hi); text-transform: uppercase; letter-spacing: 5px;
  text-shadow: 0 0 20px var(--cy-glow);
}
body.profile-select .intro { color: var(--cy-dim); letter-spacing: 1px; }
body.profile-select .profiles a {
  position: relative; overflow: hidden; color: var(--txt-md);
  background: linear-gradient(145deg, rgba(var(--panel-rgb), .86), rgba(2, 9, 17, .68));
  border: 1px solid var(--panel-brd); border-radius: 3px;
  box-shadow: 0 16px 50px rgba(0, 0, 0, .35); backdrop-filter: blur(7px);
}
body.profile-select .profiles a::before {
  content: ''; position: absolute; left: 0; top: 0; width: 46px; height: 1px;
  background: var(--cy); box-shadow: 0 0 10px var(--cy-glow);
}
body.profile-select .profiles a:hover,
body.profile-select .profiles a:focus-visible {
  border-color: var(--cy); background: rgba(var(--panel-rgb), .94);
  box-shadow: 0 0 24px rgba(var(--acc-rgb), .16), 0 18px 50px rgba(0, 0, 0, .4);
}
body.profile-select .name { color: var(--txt-hi); text-transform: uppercase; letter-spacing: 3px; }
body.profile-select .subjects { color: var(--txt-soft); }
body.profile-select .arrow { color: var(--cy); text-transform: uppercase; letter-spacing: 1px; }

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition-duration: .01ms !important; }
}