:root {
  --ink: #142033;
  --ink-soft: #3d4b63;
  --paper: #f3eee6;
  --paper-deep: #e7dfd2;
  --line: #cfc4b4;
  --line-strong: #b5a794;
  --brand: #8c1d2c;
  --brand-deep: #64141f;
  --navy: #1a2f4a;
  --navy-soft: #2a4566;
  --event-1: #1a2f4a;
  --event-2: #8c1d2c;
  --event-3: #2f6b5a;
  --event-4: #8a5a1f;
  --event-5: #3f4f8a;
  --shadow: 0 12px 32px rgba(20, 32, 51, 0.12);
  --header-h: auto;
  --slot-h: 28px;
  --time-col: 58px;
  --day-start: 8;
  --day-end: 21;
  --font-display: "Fraunces", Georgia, serif;
  --font-body: "DM Sans", "Segoe UI", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(140, 29, 44, 0.08), transparent 55%),
    radial-gradient(900px 500px at 100% 0%, rgba(26, 47, 74, 0.1), transparent 50%),
    linear-gradient(180deg, #efe8dc 0%, var(--paper) 40%, #ebe4d8 100%);
}

[hidden] {
  display: none !important;
}

.auth-gate {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: grid;
  place-items: center;
  padding: 1.25rem;
  background:
    linear-gradient(145deg, rgba(26, 47, 74, 0.92), rgba(100, 20, 31, 0.88)),
    url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.auth-panel {
  width: min(100%, 420px);
  padding: 2rem 1.75rem;
  border-radius: 18px;
  background: rgba(243, 238, 230, 0.97);
  box-shadow: var(--shadow);
  animation: rise-in 0.45s ease both;
}

.auth-kicker,
.brand-kicker {
  margin: 0 0 0.35rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--brand);
}

.auth-panel h1,
.brand-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--navy);
}

.auth-panel h1 {
  font-size: clamp(1.8rem, 5vw, 2.2rem);
}

.auth-copy,
.brand-sub {
  margin: 0.65rem 0 0;
  color: var(--ink-soft);
  line-height: 1.45;
}

.auth-form,
#auth-form {
  margin-top: 1.4rem;
  display: grid;
  gap: 0.55rem;
}

.field-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--ink-soft);
}

#auth-password,
.controls select,
.controls input {
  width: 100%;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  padding: 0.7rem 0.85rem;
  font: inherit;
  color: var(--ink);
  background: #fffdf8;
}

#auth-password:focus,
.controls select:focus,
.controls input:focus {
  outline: 2px solid rgba(140, 29, 44, 0.35);
  border-color: var(--brand);
}

.auth-error {
  margin: 0;
  color: var(--brand-deep);
  font-size: 0.88rem;
  font-weight: 600;
}

.btn-primary {
  margin-top: 0.35rem;
  border: 0;
  border-radius: 999px;
  padding: 0.8rem 1.1rem;
  font: inherit;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--brand-deep));
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 18px rgba(140, 29, 44, 0.28);
}

.btn-secondary {
  width: 100%;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  padding: 0.7rem 0.85rem;
  font: inherit;
  font-weight: 700;
  color: var(--navy);
  background: #fffdf8;
  cursor: pointer;
}

.btn-secondary:hover {
  border-color: var(--brand);
  color: var(--brand-deep);
}

.print-banner {
  display: none;
}

.action-control {
  align-content: end;
}

.app {
  width: min(1400px, calc(100% - 1.5rem));
  margin: 0 auto;
  padding: 1rem 0 2.5rem;
  animation: rise-in 0.4s ease both;
}

.site-header {
  display: grid;
  gap: 1rem;
  padding: 1.1rem 1.15rem 1.2rem;
  border: 1px solid rgba(181, 167, 148, 0.55);
  border-radius: 18px;
  background: rgba(255, 253, 248, 0.82);
  backdrop-filter: blur(8px);
  box-shadow: var(--shadow);
}

.brand-title {
  font-size: clamp(1.6rem, 4vw, 2.35rem);
}

.controls {
  display: grid;
  gap: 0.75rem;
}

.control {
  display: grid;
  gap: 0.35rem;
}

.control span {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.status-line {
  margin: 1rem 0 0.75rem;
  font-size: 0.92rem;
  color: var(--ink-soft);
}

.calendar-root {
  display: grid;
  gap: 1rem;
}

.room-calendar {
  border: 1px solid rgba(181, 167, 148, 0.65);
  border-radius: 16px;
  background: #fffdf8;
  box-shadow: 0 8px 20px rgba(20, 32, 51, 0.06);
  animation: rise-in 0.35s ease both;
}

.room-header {
  padding: 0.85rem 1rem;
  border-radius: 16px 16px 0 0;
  background: linear-gradient(120deg, var(--navy), var(--navy-soft));
  color: #f7f1e8;
}

.room-header h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
}

.room-header p {
  margin: 0.2rem 0 0;
  font-size: 0.82rem;
  opacity: 0.85;
}

.day-grid {
  display: grid;
  grid-template-columns: var(--time-col) 1fr;
  position: relative;
}

.time-rail,
.day-canvas {
  position: relative;
}

.time-rail {
  border-right: 1px solid var(--line);
  background: linear-gradient(180deg, #faf6ef, #f3eee6);
}

.time-label {
  position: absolute;
  left: 0;
  right: 0;
  transform: translateY(-50%);
  padding: 0 0.35rem 0 0.45rem;
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--ink-soft);
  text-align: right;
}

.day-canvas {
  min-height: calc(var(--slot-h) * 26);
  background-image: repeating-linear-gradient(
    to bottom,
    transparent 0,
    transparent calc(var(--slot-h) - 1px),
    var(--line) calc(var(--slot-h) - 1px),
    var(--line) var(--slot-h)
  );
}

.hour-line {
  position: absolute;
  left: 0;
  right: 0;
  border-top: 1px solid var(--line-strong);
  pointer-events: none;
}

.class-block {
  position: absolute;
  left: 0.35rem;
  right: 0.35rem;
  z-index: 2;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 10px;
  padding: 0.35rem 0.45rem;
  margin: 0;
  color: #fff;
  text-align: left;
  font: inherit;
  box-shadow: 0 4px 12px rgba(20, 32, 51, 0.18);
  cursor: pointer;
  transition: transform 0.15s ease, filter 0.15s ease;
  -webkit-tap-highlight-color: transparent;
}

.class-block:hover,
.class-block:focus-visible {
  transform: scale(1.01);
  filter: brightness(1.08);
  z-index: 5;
}

.class-block:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 2px;
}

.class-block .course-title {
  margin: 0;
  font-size: 0.78rem;
  font-weight: 700;
  line-height: 1.2;
}

.class-block .course-code,
.class-block .course-time,
.class-block .course-instr {
  margin: 0.12rem 0 0;
  font-size: 0.68rem;
  line-height: 1.25;
  opacity: 0.95;
}

.class-block .course-instr {
  font-weight: 600;
}

.empty-state {
  padding: 2rem 1.25rem;
  text-align: center;
  color: var(--ink-soft);
  border: 1px dashed var(--line-strong);
  border-radius: 16px;
  background: rgba(255, 253, 248, 0.7);
}

.class-modal {
  position: fixed;
  inset: 0;
  z-index: 1100;
  display: grid;
  place-items: center;
  padding: 1rem;
}

.class-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(20, 32, 51, 0.55);
  backdrop-filter: blur(3px);
}

.class-modal-panel {
  position: relative;
  z-index: 1;
  width: min(100%, 440px);
  max-height: min(90vh, 640px);
  overflow: auto;
  padding: 1.35rem 1.25rem 1.25rem;
  border-radius: 18px;
  background: #fffdf8;
  box-shadow: var(--shadow);
  animation: rise-in 0.3s ease both;
}

.class-modal-close {
  position: absolute;
  top: 0.85rem;
  right: 0.85rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 0.35rem 0.75rem;
  font: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--ink-soft);
  background: #fff;
  cursor: pointer;
}

.class-modal-kicker {
  margin: 0 2.5rem 0.35rem 0;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--brand);
}

.class-modal-panel h2 {
  margin: 0 2.5rem 1rem 0;
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 4vw, 1.45rem);
  line-height: 1.25;
  color: var(--navy);
}

.class-modal-details {
  margin: 0;
  display: grid;
  gap: 0.75rem;
}

.class-modal-details div {
  display: grid;
  gap: 0.15rem;
  padding-bottom: 0.7rem;
  border-bottom: 1px solid var(--line);
}

.class-modal-details div:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.class-modal-details dt {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.class-modal-details dd {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.35;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.class-modal-done {
  width: 100%;
  margin-top: 1.15rem;
}

@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Desktop overview: multi-column room calendars */
@media (min-width: 900px) {
  :root {
    --slot-h: 24px;
    --time-col: 52px;
  }

  .app {
    width: min(1600px, calc(100% - 2rem));
    padding-top: 1.35rem;
  }

  .site-header {
    grid-template-columns: 1.1fr 1.4fr;
    align-items: end;
    padding: 1.35rem 1.5rem;
  }

  .controls {
    grid-template-columns: 1fr 1.4fr auto;
  }

  .calendar-root {
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.1rem;
  }

  .class-block {
    padding: 0.3rem 0.4rem;
  }

  .class-block .course-title {
    font-size: 0.72rem;
  }

  .class-block .course-code,
  .class-block .course-time,
  .class-block .course-instr {
    font-size: 0.64rem;
  }
}

@media (min-width: 1200px) {
  .calendar-root {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  }
}

/* Mobile: taller slots, stacked rooms, sticky filters */
@media (max-width: 899px) {
  :root {
    --slot-h: 32px;
    --mobile-sticky-top: 0px;
  }

  .site-header {
    position: sticky;
    top: 0;
    z-index: 30;
  }

  .brand-sub {
    display: none;
  }

  .action-control {
    display: none;
  }

  .room-header {
    position: sticky;
    top: var(--mobile-sticky-top);
    z-index: 20;
    border-radius: 12px 12px 0 0;
    box-shadow: 0 6px 14px rgba(20, 32, 51, 0.18);
  }

  .room-calendar {
    border-radius: 12px;
  }

  .class-block .course-title {
    font-size: 0.84rem;
  }

  .class-block .course-code,
  .class-block .course-time,
  .class-block .course-instr {
    font-size: 0.74rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}

@media print {
  @page {
    size: letter landscape;
    margin: 0.4in;
  }

  body {
    background: #fff !important;
    color: #000;
  }

  .auth-gate,
  .site-header .controls,
  .class-modal,
  .status-line,
  .brand-sub {
    display: none !important;
  }

  .app {
    width: 100%;
    margin: 0;
    padding: 0;
    animation: none;
  }

  .site-header {
    box-shadow: none;
    border: 0;
    background: transparent;
    padding: 0 0 0.4rem;
  }

  .print-banner {
    display: block !important;
    margin: 0 0 0.75rem;
    padding-bottom: 0.45rem;
    border-bottom: 2px solid #000;
  }

  .print-banner h2 {
    margin: 0;
    font-family: var(--font-display);
    font-size: 1.25rem;
  }

  .print-banner p {
    margin: 0.2rem 0 0;
    font-size: 0.9rem;
  }

  .calendar-root {
    display: grid !important;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.45rem;
  }

  .room-calendar {
    break-inside: avoid;
    page-break-inside: avoid;
    box-shadow: none;
    border: 1px solid #888;
    border-radius: 0;
    overflow: hidden;
  }

  .room-header {
    position: static;
    background: #1a2f4a !important;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
    padding: 0.4rem 0.5rem;
    border-radius: 0;
    box-shadow: none;
  }

  .room-header h2 {
    font-size: 0.85rem;
  }

  .room-header p {
    font-size: 0.7rem;
  }

  :root {
    --slot-h: 14px;
    --time-col: 40px;
  }

  .class-block {
    box-shadow: none;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }

  .class-block .course-title {
    font-size: 0.55rem;
  }

  .class-block .course-code,
  .class-block .course-time,
  .class-block .course-instr {
    font-size: 0.5rem;
  }
}