/* Estilos para login, panel de administración y página de estudiantes */
:root {
  --verde-oscuro: #00663e;
  --verde: #36a251;
  --verde-claro: #81d040;
  --verde-suave: #eaf6ee;
  --texto: #17261e;
  --gris: #5d6d64;
  --borde: #dbe5df;
  --fondo: #f4f7f5;
  --blanco: #ffffff;
  --rojo: #c0392b;
  --radio: 14px;
  --sombra: 0 1px 2px rgba(0, 40, 20, .06), 0 8px 24px rgba(0, 40, 20, .07);
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  font-family: 'Source Sans 3', system-ui, sans-serif;
  font-size: 17px;
  line-height: 1.5;
  color: var(--texto);
  background: var(--fondo);
}
h1, h2, h3 { font-family: 'Montserrat', system-ui, sans-serif; line-height: 1.2; margin: 0; }
a { color: var(--verde-oscuro); }
.muted { color: var(--gris); }
.small { font-size: 14px; }
.nowrap { white-space: nowrap; }
.pre { white-space: pre-wrap; word-break: break-word; }
[hidden] { display: none !important; }

label { display: block; font-weight: 600; margin-bottom: 14px; }
input, textarea {
  display: block; width: 100%; margin-top: 6px;
  font: inherit; color: inherit;
  padding: 12px 14px;
  border: 1.5px solid var(--borde); border-radius: 10px; background: #fff;
  transition: border-color .15s, box-shadow .15s;
}
input:focus, textarea:focus { outline: none; border-color: var(--verde); box-shadow: 0 0 0 4px rgba(54, 162, 81, .15); }
textarea { resize: vertical; min-height: 110px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  font: 600 15px/1 'Source Sans 3', sans-serif;
  padding: 11px 18px; border-radius: 10px; border: 1.5px solid transparent;
  cursor: pointer; text-decoration: none; transition: background .15s, transform .1s, border-color .15s;
}
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn-primary { background: var(--verde-oscuro); color: #fff; }
.btn-primary:hover { background: #00522f; }
.btn-light { background: var(--verde-suave); color: var(--verde-oscuro); border-color: #cfe7d7; }
.btn-light:hover { background: #dcefe3; }
.btn-ghost { background: transparent; color: var(--texto); border-color: var(--borde); }
.btn-ghost:hover { background: #fff; }
.btn-danger { background: #fff; color: var(--rojo); border-color: #f0c9c4; }
.btn-danger:hover { background: #fdf0ee; }
.btn-sm { padding: 8px 12px; font-size: 14px; }
.btn-block { width: 100%; padding: 14px; font-size: 16px; }
.btn-icon { border: 0; background: transparent; color: var(--gris); cursor: pointer; font-size: 15px; padding: 4px 8px; border-radius: 6px; }
.btn-icon:hover { background: #fdf0ee; color: var(--rojo); }
.linklike { border: 0; background: none; color: var(--verde-oscuro); text-decoration: underline; cursor: pointer; font: inherit; font-size: 14px; }

.alert { background: #fdf0ee; color: var(--rojo); padding: 10px 14px; border-radius: 10px; margin-bottom: 14px; }
.notice {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  background: #fff8e1; border: 1px solid #f3e1a4; color: #6b5409;
  padding: 12px 16px; border-radius: 12px; margin-bottom: 20px;
}
.form-msg { min-height: 1.2em; font-size: 14px; margin-bottom: 10px; }
.form-msg.err { color: var(--rojo); }
.form-msg.ok { color: var(--verde-oscuro); }
.qnum {
  display: inline-grid; place-items: center; flex: none;
  width: 30px; height: 30px; border-radius: 50%;
  background: var(--verde-oscuro); color: #fff;
  font: 700 15px 'Montserrat', sans-serif;
}

/* ---------- Login ---------- */
.page-login {
  min-height: 100vh; display: grid; place-items: center; padding: 16px;
  background: #fff url('../img/fondo.png') center / cover no-repeat;
}
.login-card {
  width: min(420px, 100%); background: #fff; padding: 32px 28px;
  border-radius: 18px; box-shadow: var(--sombra); border: 1px solid var(--borde);
}
.login-logo { width: 100%; max-width: 320px; display: block; margin: 0 auto 22px; }
.login-card h1 { font-size: 22px; color: var(--verde-oscuro); }
.login-card .muted { margin: 4px 0 20px; font-size: 15px; }

/* ---------- Panel ---------- */
.topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; gap: 18px; flex-wrap: wrap;
  padding: 12px 24px; background: #fff; border-bottom: 4px solid var(--verde-oscuro);
  box-shadow: 0 2px 10px rgba(0, 0, 0, .04);
}
.topbar-logo { height: 42px; }
.topbar-title { display: flex; flex-direction: column; line-height: 1.25; flex: 1; min-width: 200px; }
.topbar-title strong { font-family: 'Montserrat', sans-serif; color: var(--verde-oscuro); }
.topbar-title span { color: var(--gris); font-size: 14px; }
.topbar-actions { display: flex; gap: 8px; flex-wrap: wrap; }

.admin-main { max-width: 1200px; margin: 0 auto; padding: 24px 16px 60px; }
.act-card {
  background: #fff; border: 1px solid var(--borde); border-radius: 18px;
  box-shadow: var(--sombra); padding: 24px; margin-bottom: 28px;
}
.act-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; flex-wrap: wrap; margin-bottom: 18px; }
.act-head h2 { font-size: 21px; color: var(--verde-oscuro); margin-bottom: 6px; }
.act-buttons { display: flex; gap: 8px; }
.pill { display: inline-block; font-size: 13px; font-weight: 700; padding: 3px 10px; border-radius: 99px; }
.pill-on { background: #e3f5e8; color: var(--verde-oscuro); }
.pill-off { background: #f1f1f1; color: var(--gris); }

.act-grid { display: grid; grid-template-columns: 1fr auto; gap: 20px; margin-bottom: 18px; }
.metrics { display: grid; grid-template-columns: repeat(2, minmax(0, 170px)) 1fr; gap: 14px; align-items: stretch; }
.metric { background: var(--verde-suave); border-radius: 14px; padding: 14px 16px; display: flex; flex-direction: column; justify-content: center; }
.metric-num { font: 800 38px/1 'Montserrat', sans-serif; color: var(--verde-oscuro); font-variant-numeric: tabular-nums; }
.metric-lbl { color: var(--gris); font-weight: 600; margin-top: 4px; }
.qbars { display: flex; flex-direction: column; justify-content: center; gap: 10px; padding: 6px 4px; }
.qbar { display: grid; grid-template-columns: 90px 1fr 34px; align-items: center; gap: 10px; font-weight: 600; font-size: 15px; }
.qbar b { text-align: right; font-variant-numeric: tabular-nums; }
.bar { height: 10px; background: #edf2ef; border-radius: 99px; overflow: hidden; }
.bar i { display: block; height: 100%; background: linear-gradient(90deg, var(--verde), var(--verde-claro)); border-radius: 99px; transition: width .5s; }
.linkbox { display: flex; gap: 16px; align-items: center; border: 1px dashed var(--borde); border-radius: 14px; padding: 12px 16px; max-width: 460px; }
.linkbox .qr { flex: none; }
.linkbox .qr img, .linkbox .qr canvas { display: block; }
.link-url { display: block; word-break: break-all; font-weight: 600; margin: 2px 0 8px; }

.qblock { border-top: 1px solid var(--borde); padding-top: 16px; margin-top: 16px; }
.qblock h3 { display: flex; align-items: center; gap: 10px; font-size: 16px; margin-bottom: 10px; }
.qblock h3 small { font-family: 'Source Sans 3', sans-serif; font-weight: 600; }
.table { width: 100%; border-collapse: collapse; font-size: 15.5px; }
.table th { text-align: left; font-size: 13px; text-transform: uppercase; letter-spacing: .04em; color: var(--gris); padding: 8px 10px; border-bottom: 2px solid var(--borde); }
.table td { padding: 10px; border-bottom: 1px solid #eef2ef; vertical-align: top; }
.table tr:hover td { background: #fafcfb; }
.empty { padding: 6px 0; }
.participants { margin-top: 18px; border-top: 1px solid var(--borde); padding-top: 14px; }
.participants summary { cursor: pointer; font-weight: 700; color: var(--verde-oscuro); }

.dialog { border: 0; border-radius: 18px; padding: 26px; width: min(420px, calc(100% - 32px)); box-shadow: 0 20px 60px rgba(0, 0, 0, .25); }
.dialog::backdrop { background: rgba(0, 30, 15, .45); }
.dialog h2 { font-size: 20px; margin-bottom: 18px; color: var(--verde-oscuro); }
.dialog-actions { display: flex; justify-content: flex-end; gap: 8px; }

@media (max-width: 820px) {
  .act-grid { grid-template-columns: 1fr; }
  .metrics { grid-template-columns: 1fr 1fr; }
  .qbars { grid-column: 1 / -1; }
  .table th:nth-child(3), .table td:nth-child(3) { display: none; }
}

/* ---------- Estudiantes ---------- */
.page-student { background: var(--fondo); min-height: 100vh; }
.st-header { background: #fff; padding: 14px 16px; border-bottom: 5px solid var(--verde-oscuro); text-align: center; position: relative; overflow: hidden; }
.st-header::after {
  content: ''; position: absolute; top: 0; right: 0; width: 90px; height: 100%;
  background: linear-gradient(135deg, transparent 50%, var(--verde-claro) 50%, var(--verde) 100%);
  opacity: .9;
}
.st-header img { height: 46px; max-width: calc(100% - 70px); object-fit: contain; }
.st-main { max-width: 680px; margin: 0 auto; padding: 22px 16px 60px; }
.eyebrow { text-transform: uppercase; letter-spacing: .08em; font-size: 13px; font-weight: 700; color: var(--verde); margin: 0 0 4px; }
.st-main h1 { font-size: 26px; color: var(--verde-oscuro); margin-bottom: 18px; }
.st-card { background: #fff; border: 1px solid var(--borde); border-radius: 16px; padding: 20px; box-shadow: var(--sombra); margin-bottom: 16px; }
.st-hello { margin: 0 0 14px; }
.q-title { display: flex; gap: 12px; align-items: flex-start; margin-bottom: 12px; }
.q-title h2 { font-size: 17px; line-height: 1.35; padding-top: 3px; }
.q-foot { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-top: 12px; flex-wrap: wrap; }
.q-state { color: var(--gris); font-weight: 600; }
.q-card.sent { border-color: #b9e0c5; background: linear-gradient(#fff, #f6fbf7); }
.q-card.sent .q-state { color: var(--verde-oscuro); }