/*
 * Seminar announcements – Department of Computer Science and Automation, IISc
 *
 * Plan: a plain working tool. Cool grey paper, one deep-blue brand colour, and a
 * single memorable element: the email preview, which is drawn as a pinned
 * departmental notice (amber edge, monospace, 80 columns wide).
 * Fonts are system stacks so nothing is fetched from outside the campus network.
 */

:root {
  --ink: #18222e;
  --muted: #566475;
  --paper: #eef1f4;
  --panel: #ffffff;
  --line: #d0d8e1;
  --brand: #1d3b6f;
  --brand-hover: #142a4f;
  --brand-tint: #e5ebf6;
  --notice-bg: #fffdf5;
  --amber: #c98a1b;
  --focus: #e8a526;
  --error: #9f1f26;
  --error-bg: #fbecec;
  --ok: #17603c;
  --ok-bg: #e5f4ec;

  --font-body: "Segoe UI", "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --font-head: Charter, "Bitstream Charter", "Iowan Old Style", Georgia, serif;
  --font-mono: "Cascadia Mono", Consolas, "Liberation Mono", "Courier New", monospace;

  --radius: 6px;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e6ebf1;
    --muted: #9aa8b8;
    --paper: #12171e;
    --panel: #1a212b;
    --line: #2e3947;
    --brand: #7fa4e8;
    --brand-hover: #a3bdf0;
    --brand-tint: #223049;
    --notice-bg: #202631;
    --amber: #e2a73c;
    --error: #ff9a9f;
    --error-bg: #3a1d20;
    --ok: #86d6a9;
    --ok-bg: #19301f;
  }
}

*,
*::before,
*::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 1rem/1.55 var(--font-body);
}

[hidden] { display: none !important; }

a { color: var(--brand); text-underline-offset: 0.15em; }
a:hover { color: var(--brand-hover); }

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

/* ------------------------------------------------------------ header */

.site-header {
  background: #1d3b6f;
  color: #ffffff;
}

.site-header-inner {
  max-width: 56rem;
  margin: 0 auto;
  padding: 0.9rem 1rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
}

.site-dept { margin: 0; font: 600 1.05rem/1.3 var(--font-head); }
.site-tool { margin: 0; font-size: 0.9rem; opacity: 0.82; }

.logout { display: flex; align-items: center; gap: 0.75rem; margin: 0; }
.logout .who { font-size: 0.875rem; opacity: 0.85; }
.site-header .btn-quiet { color: #ffffff; border-color: rgba(255, 255, 255, 0.45); }
.site-header .btn-quiet:hover { background: rgba(255, 255, 255, 0.14); color: #ffffff; }

/* -------------------------------------------------------------- page */

.wrap {
  max-width: 56rem;
  margin: 0 auto;
  padding: 1.5rem 1rem 4rem;
}

h1 {
  margin: 0.5rem 0 1.25rem;
  font: 600 1.75rem/1.25 var(--font-head);
  letter-spacing: -0.005em;
}

.lead { max-width: 60ch; margin: 0 0 1.25rem; color: var(--muted); }

/* ------------------------------------------------------------- steps */

.steps {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.5rem;
  margin: 0 0 0.75rem;
  padding: 0;
  list-style: none;
  counter-reset: step;
  font-size: 0.9rem;
  color: var(--muted);
}

.steps li {
  counter-increment: step;
  padding-bottom: 0.3rem;
  border-bottom: 3px solid transparent;
}

.steps li::before { content: counter(step) ". "; }
.steps li.done { color: var(--ink); }
.steps li.current { color: var(--ink); font-weight: 600; border-bottom-color: var(--amber); }

/* -------------------------------------------------------------- cards */

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin: 0 0 1.25rem;
}

.stack > * + * { margin-top: 1.1rem; }

.help summary { cursor: pointer; font-weight: 600; }
.help ol { margin: 0.75rem 0 0; padding-left: 1.25rem; max-width: 62ch; }
.help li + li { margin-top: 0.35rem; }
.help .hint { margin-top: 0.75rem; }

.login { max-width: 28rem; }

/* ------------------------------------------------------------- forms */

.field {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.35rem;
}

.field > label { font-weight: 600; }
.control { min-width: 0; }

@media (min-width: 42rem) {
  .field { grid-template-columns: 11rem minmax(0, 1fr); gap: 1rem; }
  .field > label { padding-top: 0.5rem; }
}

input[type="text"],
input[type="password"],
select,
textarea {
  width: 100%;
  padding: 0.5rem 0.65rem;
  font: inherit;
  color: var(--ink);
  background: var(--panel);
  border: 1px solid #8a99ab;
  border-radius: var(--radius);
}

select { width: auto; max-width: 100%; }
textarea { resize: vertical; line-height: 1.45; }
input[readonly] { background: var(--paper); color: var(--muted); }

.control > input + select,
.control > select + input { margin-top: 0.5rem; }
.control > select + input[type="text"] { display: block; }

.inline { display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem; }
.inline .sep { color: var(--muted); }
.after { margin-left: 0.4rem; color: var(--muted); }

.hint { margin: 0.35rem 0 0; font-size: 0.875rem; color: var(--muted); }

.has-error input,
.has-error select,
.has-error textarea { border-color: var(--error); border-width: 2px; }

.error {
  margin: 0.4rem 0 0;
  padding-left: 0.6rem;
  border-left: 3px solid var(--error);
  color: var(--error);
  font-size: 0.925rem;
  font-weight: 600;
}

/* ----------------------------------------------------------- buttons */

.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
}

.actions form { margin: 0; }
.actions .hint { margin: 0; }
.back { margin: 0; }

.btn {
  display: inline-block;
  padding: 0.6rem 1.15rem;
  font: 600 1rem/1.3 var(--font-body);
  text-decoration: none;
  text-align: center;
  color: var(--ink);
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
}

.btn-primary { background: var(--brand); border-color: var(--brand); color: #ffffff; }
.btn-primary:hover { background: var(--brand-hover); border-color: var(--brand-hover); color: #ffffff; }
@media (prefers-color-scheme: dark) {
  .btn-primary,
  .btn-primary:hover { color: #0d1522; }
}

.btn-secondary { background: var(--panel); border-color: var(--brand); color: var(--brand); }
.btn-secondary:hover { background: var(--brand-tint); color: var(--brand-hover); }

.btn-quiet { padding: 0.4rem 0.8rem; font-size: 0.9rem; font-weight: 500; border-color: var(--line); color: var(--ink); }
.btn-quiet:hover { background: var(--brand-tint); }

.btn[disabled] { opacity: 0.6; cursor: progress; }

/* ------------------------------------------------------------ alerts */

.alert {
  margin: 0 0 1.25rem;
  padding: 0.8rem 1rem;
  border-left: 4px solid;
  border-radius: 0 var(--radius) var(--radius) 0;
  font-weight: 600;
}

.alert-error { background: var(--error-bg); border-color: var(--error); color: var(--error); }
.alert-ok { background: var(--ok-bg); border-color: var(--ok); color: var(--ok); }

.detail {
  margin: 0 0 1.25rem;
  padding: 0.75rem 1rem;
  overflow-x: auto;
  white-space: pre-wrap;
  font: 0.85rem/1.45 var(--font-mono);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

/* ------------------------------------------------- the pinned notice */

.notice {
  max-width: 86ch;
  margin: 0 0 1.5rem;
  padding: 1.5rem 1.75rem;
  overflow-x: auto;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  font: 0.85rem/1.55 var(--font-mono);
  color: var(--ink);
  background: var(--notice-bg);
  border: 1px solid var(--line);
  border-left: 6px solid var(--amber);
  border-radius: 2px;
  box-shadow: 0 1px 0 var(--line), 0 6px 14px -10px rgba(0, 0, 0, 0.35);
}

.control > .notice { margin-bottom: 0; }

/* --------------------------------------------------- seminar chooser */

.seminar-list { margin: 0; padding: 0; border: 0; min-width: 0; }
.seminar-list legend { padding: 0; margin-bottom: 0.5rem; font-weight: 600; }

.seminar-row {
  display: grid;
  grid-template-columns: auto 8.5rem minmax(0, 1fr);
  align-items: baseline;
  gap: 0.25rem 0.9rem;
  padding: 0.7rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
}

.seminar-row + .seminar-row { margin-top: 0.5rem; }
.seminar-row:hover { background: var(--brand-tint); }
.seminar-row:has(input:checked) { border-color: var(--brand); background: var(--brand-tint); }
.seminar-when { font-weight: 600; white-space: nowrap; }
.seminar-what { min-width: 0; }
.seminar-what strong { display: block; }
.seminar-what { color: var(--muted); }
.seminar-what strong { color: var(--ink); }

/* ------------------------------------------------------- small screens */

@media (max-width: 41.99rem) {
  .card { padding: 1.1rem; }
  h1 { font-size: 1.5rem; }
  .actions > .btn,
  .actions > form,
  .actions > form .btn { width: 100%; }
  .seminar-row { grid-template-columns: auto minmax(0, 1fr); }
  .seminar-when { grid-column: 2; }
  .seminar-what { grid-column: 2; }
  .notice { padding: 1rem; font-size: 0.8rem; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; scroll-behavior: auto !important; }
}

@media print {
  .site-header, .steps, .actions, .logout { display: none; }
  body { background: #fff; }
  .notice { box-shadow: none; }
}