/* ============================================================
   style.css — M-GATE (vista alumnos)
   Blue sci-fi · ECOSYSTE-M / Profesor M
   ============================================================ */

:root {
  --color-bg-black:    #050a14;
  --color-bg:          #0a1628;
  --color-panel:       #0e1f38;
  --color-panel-light: #142b4d;
  --color-border:      #1f4068;
  --color-cyan:        #4fd6ff;
  --color-cyan-soft:   #8be9ff;
  --color-text-bright: #e7f2ff;
  --color-text-muted:  #93b3da;
  --color-success:     #3ddc97;
  --color-error:       #ff5a6a;
  --color-warning:     #f5a623;
  --font-display: 'Orbitron', sans-serif;
  --font-body:    'Rajdhani', sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }
html { font-size: 17px; }
body {
  background: var(--color-bg-black);
  color: var(--color-text-bright);
  font-family: var(--font-body);
  font-weight: 500;
  min-height: 100vh;
  overflow-x: hidden;
}

.background-grid {
  position: fixed; inset: 0; z-index: -1;
  background-image:
    linear-gradient(rgba(79,214,255,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(79,214,255,.05) 1px, transparent 1px);
  background-size: 40px 40px;
  background-color: var(--color-bg-black);
}
.background-grid::before {
  content: ''; position: absolute; inset: 0;
  background:
    radial-gradient(ellipse at top, rgba(43,108,255,.15), transparent 60%),
    radial-gradient(ellipse at bottom, rgba(79,214,255,.08), transparent 60%);
}

/* ── Header ── */
.site-header {
  border-bottom: 1px solid var(--color-border);
  background: linear-gradient(180deg, rgba(14,31,56,.95), rgba(10,22,40,.7));
  backdrop-filter: blur(6px);
  position: sticky; top: 0; z-index: 50;
}
.header-inner {
  max-width: 680px; margin: 0 auto;
  padding: 12px 16px;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.logo-slot {
  width: 38px; height: 38px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  border: 1.5px solid var(--color-border); border-radius: 6px;
  background: var(--color-panel);
}
.logo-img { width: 100%; height: 100%; object-fit: contain; padding: 5px; }
h1 {
  font-family: var(--font-display); font-size: clamp(14px,3.5vw,17px);
  letter-spacing: 1.2px; color: var(--color-text-bright); line-height: 1.3;
}
h1 span { color: var(--color-cyan); }
.subtitle { color: var(--color-text-muted); font-size: 11px; letter-spacing: .6px; text-transform: uppercase; margin-top: 1px; }
.back-link {
  color: var(--color-text-muted); text-decoration: none; font-size: .82rem; font-weight: 600;
  padding: 7px 12px; border: 1px solid var(--color-border); border-radius: 4px;
  background: var(--color-panel); transition: all .18s; white-space: nowrap;
}
.back-link:hover { color: var(--color-cyan); border-color: var(--color-cyan); }

/* ── Main ── */
.main-container {
  max-width: 680px; margin: 0 auto;
  padding: 16px 16px 60px;
}
.hidden { display: none !important; }

/* ── Loading / Error ── */
.screen-center {
  display: flex; flex-direction: column; align-items: center;
  justify-content: center; padding: 60px 20px; gap: 12px; text-align: center;
}
.spinner {
  width: 36px; height: 36px; border: 3px solid var(--color-border);
  border-top-color: var(--color-cyan); border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-text { color: var(--color-text-muted); font-size: .9rem; }
.error-icon   { font-size: 2rem; }
.error-msg    { color: var(--color-text-muted); line-height: 1.6; font-size: .95rem; }

/* ── Selector de carpetas ── */
.carpeta-hint {
  color: var(--color-text-muted); font-size: .85rem;
  margin-bottom: 12px; letter-spacing: .3px;
}
.carpeta-btns {
  display: flex; flex-direction: column; gap: 8px;
}
.carpeta-btn {
  display: flex; align-items: center; gap: 10px;
  background: linear-gradient(160deg, var(--color-panel), var(--color-bg));
  border: 1px solid var(--color-border); border-radius: 6px;
  padding: 14px 16px; cursor: pointer; text-align: left;
  transition: border-color .18s, box-shadow .18s;
  color: var(--color-text-bright); font-family: var(--font-body);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
}
.carpeta-btn:hover {
  border-color: var(--color-cyan);
  box-shadow: 0 0 14px rgba(79,214,255,.15);
}
.carpeta-btn-nombre {
  flex: 1; font-family: var(--font-display); font-size: .82rem;
  letter-spacing: .5px; color: var(--color-text-bright);
}
.carpeta-btn-count {
  font-size: .78rem; color: var(--color-text-muted);
  background: var(--color-panel-light); padding: 2px 10px;
  border-radius: 10px; border: 1px solid var(--color-border);
}
.carpeta-btn-arrow { color: var(--color-cyan); font-size: 1.1rem; }

/* ── Links header ── */
.links-header {
  display: flex; align-items: center; gap: 12px;
  margin-bottom: 14px;
}
.btn-back {
  color: var(--color-cyan); background: none; border: none;
  font-family: var(--font-body); font-size: .95rem; font-weight: 600;
  cursor: pointer; padding: 4px 0; display: flex; align-items: center; gap: 4px;
}
.btn-back:hover { text-decoration: underline; }
.carpeta-nombre-actual {
  font-family: var(--font-display); font-size: .78rem;
  letter-spacing: .6px; color: var(--color-cyan-soft);
}

/* ── Link cards ── */
.link-card {
  display: flex; align-items: flex-start; gap: 14px;
  background: linear-gradient(160deg, var(--color-panel), var(--color-bg));
  border: 1px solid var(--color-border); border-radius: 6px;
  padding: 14px; margin-bottom: 10px;
  transition: border-color .18s, box-shadow .18s;
}
.link-card:hover {
  border-color: rgba(79,214,255,.4);
  box-shadow: 0 0 12px rgba(79,214,255,.08);
}

.link-img {
  width: 80px; height: 60px; object-fit: cover;
  border-radius: 4px; flex-shrink: 0;
  border: 1px solid var(--color-border);
}
.link-img--empty {
  width: 80px; height: 60px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  background: var(--color-panel-light);
  border: 1px solid var(--color-border); border-radius: 4px;
  font-size: 1.5rem; color: var(--color-text-muted);
}

.link-body        { flex: 1; min-width: 0; }
.link-nombre      { font-family: var(--font-display); font-size: .82rem; color: var(--color-text-bright); margin-bottom: 4px; letter-spacing: .3px; }
.link-desc        { font-size: .85rem; color: var(--color-text-muted); margin-bottom: 8px; line-height: 1.45; }
.link-action-row  { margin-top: 8px; }

/* ── Badges ── */
.badge-pwd-locked {
  display: inline-flex; align-items: center; gap: 4px;
  font-size: .72rem; font-weight: 700;
  background: rgba(245,166,35,.1); color: var(--color-warning);
  border: 1px solid rgba(245,166,35,.3);
  padding: 3px 10px; border-radius: 20px; margin-bottom: 8px;
}
.badge-pwd-open {
  display: inline-flex; align-items: center; gap: 4px;
  font-size: .72rem; font-weight: 700;
  background: rgba(61,220,151,.1); color: var(--color-success);
  border: 1px solid rgba(61,220,151,.3);
  padding: 3px 10px; border-radius: 20px; margin-bottom: 8px;
}

/* ── Botones de acción ── */
.btn-open-link {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--font-display); font-size: .7rem; letter-spacing: .8px;
  color: var(--color-bg-black); text-decoration: none;
  background: linear-gradient(135deg, var(--color-cyan), var(--color-cyan-soft));
  border: none; border-radius: 4px; padding: 8px 16px;
  transition: box-shadow .2s, transform .12s;
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
}
.btn-open-link:hover { box-shadow: 0 0 16px rgba(79,214,255,.5); transform: translateY(-1px); }

.btn-unlock {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--font-body); font-size: .85rem; font-weight: 600;
  color: var(--color-warning); background: rgba(245,166,35,.08);
  border: 1px solid rgba(245,166,35,.35); border-radius: 4px;
  padding: 7px 14px; cursor: pointer; transition: all .18s;
}
.btn-unlock:hover { background: rgba(245,166,35,.15); border-color: var(--color-warning); }

/* ── Botones generales ── */
.btn-primary {
  font-family: var(--font-display); font-size: .75rem; letter-spacing: 1px;
  text-transform: uppercase; color: var(--color-bg-black);
  background: linear-gradient(135deg, var(--color-cyan), var(--color-cyan-soft));
  border: none; border-radius: 4px; padding: 11px 20px; cursor: pointer;
  transition: all .2s;
}
.btn-primary:hover { box-shadow: 0 0 18px rgba(79,214,255,.5); transform: translateY(-1px); }

.btn-ghost {
  font-family: var(--font-body); font-size: .88rem; font-weight: 600;
  color: var(--color-text-muted); background: var(--color-panel);
  border: 1.5px solid var(--color-border); border-radius: 4px;
  padding: 9px 16px; cursor: pointer; transition: all .18s;
}
.btn-ghost:hover { color: var(--color-cyan); border-color: var(--color-cyan); }

/* ── Modal ── */
.modal {
  position: fixed; inset: 0; z-index: 200;
  display: flex; align-items: flex-end; justify-content: center;
  padding: 0;
}
.modal-backdrop { position: fixed; inset: 0; background: rgba(0,0,0,.75); z-index: -1; }
.modal-panel {
  background: var(--color-panel); border: 1px solid var(--color-border);
  border-radius: 16px 16px 0 0; width: 100%; max-width: 480px;
  box-shadow: 0 -4px 30px rgba(0,0,0,.5);
}
.modal-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 18px; border-bottom: 1px solid var(--color-border);
}
.modal-title { font-family: var(--font-display); font-size: .8rem; color: var(--color-cyan); letter-spacing: .06em; }
.modal-close {
  background: none; border: none; color: var(--color-text-muted);
  font-size: 1rem; cursor: pointer; padding: 4px 8px;
}
.modal-close:hover { color: var(--color-error); }
.modal-body { padding: 18px; }
.modal-btns { display: flex; gap: 10px; margin-top: 16px; justify-content: flex-end; }

.pwd-hint {
  color: var(--color-text-muted); font-size: .88rem; margin-bottom: 12px;
}
.pwd-input {
  width: 100%; background: var(--color-panel-light);
  border: 1.5px solid var(--color-border); color: var(--color-text-bright);
  font-family: var(--font-body); font-size: 1.2rem;
  letter-spacing: 4px; text-align: center;
  padding: 12px 14px; border-radius: 4px; outline: none;
}
.pwd-input:focus { border-color: var(--color-cyan); box-shadow: 0 0 0 3px rgba(79,214,255,.12); }
.pwd-error {
  color: var(--color-error); font-size: .82rem; font-weight: 600; margin-top: 8px;
}

/* ── Empty / Footer ── */
.empty-state { color: var(--color-text-muted); font-size: .9rem; padding: 30px 0; text-align: center; }
.site-footer { text-align: center; color: var(--color-text-muted); font-size: .75rem; padding: 24px; letter-spacing: .5px; }

/* ── Responsive ── */
@media (min-width: 500px) {
  .modal { align-items: center; padding: 20px; }
  .modal-panel { border-radius: 8px; }
}
@media (max-width: 400px) {
  .link-img, .link-img--empty { width: 64px; height: 48px; }
  html { font-size: 16px; }
}