:root {
  --bg: #0d0d0d;
  --surface: #171717;
  --text: #f3f3f3;
  --muted: #9d9d9d;
  --border: #2b2b2b;

  --accent-start: #f3cf67;
  --accent-end: #e89537;

  --max-width: 1180px;
}

body.light {
  --bg: #f4f1ea;
  --surface: #ffffff;
  --text: #171717;
  --muted: #676767;
  --border: #d8d3c8;
}

/* ---------- RESET ---------- */

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;

  background: var(--bg);
  color: var(--text);

  font-family:
    Inter,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    Arial,
    sans-serif;

  transition:
    background-color 0.25s ease,
    color 0.25s ease;
}

a {
  color: inherit;
  text-decoration: none;
}

/* ---------- PAGE ---------- */

.page-shell {
  width: min(100% - 48px, var(--max-width));
  min-height: 100svh;
  margin: 0 auto;

  display: grid;
  grid-template-rows: auto 1fr auto;
}

/* ---------- HEADER ---------- */

.site-header {
  min-height: 86px;

  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  font-size: 0.82rem;
  font-weight: 750;
  letter-spacing: 0.16em;

  transition: opacity 0.2s ease;
}

.site-logo:hover {
  opacity: 0.65;
}

/* ---------- THEME TOGGLE ---------- */

.theme-toggle {
  position: relative;

  width: 76px;
  height: 36px;

  padding: 0 8px;

  display: inline-flex;
  align-items: center;
  justify-content: space-between;

  border: 1px solid #d49331;
  border-radius: 999px;

  background: linear-gradient(135deg, var(--accent-start), var(--accent-end));

  cursor: pointer;
  overflow: hidden;
}

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

.theme-icon {
  position: relative;
  z-index: 2;

  width: 15px;

  font-size: 0.88rem;
  line-height: 1;
  text-align: center;

  pointer-events: none;
}

.theme-icon.moon {
  color: #151515;
}

.theme-icon.sun {
  color: #fff7dc;
}

.theme-thumb {
  position: absolute;
  z-index: 1;

  top: 3px;
  left: 3px;

  width: 28px;
  height: 28px;

  border-radius: 50%;

  background: #111111;

  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.28);

  transition:
    transform 0.25s ease,
    background-color 0.25s ease;
}

body.light .theme-thumb {
  transform: translateX(40px);
  background: #fffaf0;
}

/* ---------- MAIN ---------- */

.home-main {
  display: flex;
  align-items: center;
  justify-content: center;

  padding: 32px 0 44px;
}

.home-hero {
  width: min(100%, 920px);

  text-align: center;
}

.hero-eyebrow {
  margin: 0 0 22px;

  color: var(--muted);

  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.hero-title {
  margin: 0;

  font-size: clamp(2.7rem, 6.2vw, 5.8rem);
  font-weight: 720;
  line-height: 0.98;
  letter-spacing: -0.055em;
}

.hero-title span {
  display: block;
}

.title-connector {
  color: var(--muted);
  margin: 0.08em 0;
}

.hero-description {
  width: min(100%, 650px);

  margin: 30px auto 0;

  color: var(--muted);

  font-size: clamp(0.96rem, 1.4vw, 1.08rem);
  line-height: 1.7;
}

.hero-navigation {
  margin-top: 36px;

  display: flex;
  justify-content: center;
  gap: 12px;
}

.hero-navigation a {
  min-width: 132px;

  padding: 13px 22px;

  border: 1px solid var(--border);
  border-radius: 999px;

  background: var(--surface);

  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;

  transition:
    border-color 0.2s ease,
    background-color 0.2s ease;
}

.hero-navigation a:hover {
  border-color: var(--muted);
}

/* ---------- FOOTER ---------- */

.site-footer {
  min-height: 76px;

  display: flex;
  align-items: center;
  justify-content: space-between;

  border-top: 1px solid var(--border);

  color: var(--muted);

  font-size: 0.76rem;
  letter-spacing: 0.04em;
}

.footer-identity {
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-dot {
  opacity: 0.5;
}

.admin-link {
  transition: color 0.2s ease;
}

.admin-link:hover {
  color: var(--text);
}

/* ---------- TABLET ---------- */

@media (max-width: 900px) {
  .page-shell {
    width: min(100% - 40px, var(--max-width));
  }

  .site-header {
    min-height: 78px;
  }

  .home-main {
    padding: 36px 0 46px;
  }

  .hero-title {
    font-size: clamp(2.9rem, 8vw, 4.8rem);
  }

  .hero-description {
    width: min(100%, 590px);
  }
}

/* ---------- MOBILE ---------- */

@media (max-width: 560px) {
  .page-shell {
    width: calc(100% - 32px);
  }

  .site-header {
    min-height: 60px;
  }

  .site-logo {
    font-size: 0.74rem;
    letter-spacing: 0.13em;
  }

  .theme-toggle {
    width: 70px;
    height: 34px;
  }

  .theme-thumb {
    width: 26px;
    height: 26px;
  }

  body.light .theme-thumb {
    transform: translateX(36px);
  }

  .home-main {
    align-items: flex-start;
    padding: 18px 0 22px;
  }

  .hero-eyebrow {
    margin-bottom: 14px;
  }

  .hero-title {
    font-size: clamp(2.2rem, 11vw, 3rem);
    line-height: 1;
  }

  .hero-title span {
    display: block;
  }

  .title-connector {
    margin: 0.12em 0;
  }

  .hero-description {
    margin-top: 20px;

    font-size: 0.94rem;
    line-height: 1.55;
  }

  .hero-navigation {
    width: min(100%, 300px);

    margin: 22px auto 0;

    flex-direction: column;
    gap: 8px;
  }

  .hero-navigation a {
    width: 100%;

    padding: 13px 18px;
  }

  .site-footer {
    min-height: 72px;

    padding: 10px 0;

    flex-direction: column;
    justify-content: center;
    gap: 7px;

    text-align: center;
  }

  .admin-link {
    order: 1;
  }

  .footer-identity {
    order: 2;
  }
}

/* ---------- SMALL / SHORT PHONES ---------- */

@media (max-width: 380px) {
  .hero-title {
    font-size: 2.45rem;
  }

  .hero-description {
    font-size: 0.9rem;
  }
}

/* ---------- SHORT DESKTOP / LAPTOP SCREENS ---------- */

@media (min-width: 561px) and (max-height: 720px) {
  .site-header {
    min-height: 64px;
  }

  .home-main {
    padding: 20px 0 26px;
  }

  .hero-eyebrow {
    margin-bottom: 15px;
  }

  .hero-title {
    font-size: clamp(2.5rem, 5.5vw, 4.5rem);
  }

  .hero-description {
    margin-top: 20px;
    line-height: 1.55;
  }

  .hero-navigation {
    margin-top: 25px;
  }

  .site-footer {
    min-height: 60px;
  }
}

.inner-home-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;

  width: 34px;
  height: 34px;

  margin-top: 14px;

  border: 1px solid var(--border);
  border-radius: 50%;

  color: var(--text);
  text-decoration: none;

  transition:
    opacity 0.2s ease,
    border-color 0.2s ease;
}

.inner-home-link:hover {
  opacity: 0.7;
  border-color: var(--muted);
}

.inner-home-icon {
  display: block;

  width: 17px;
  height: 17px;
}

/* =========================================================
   SCHEDULE PAGE
   ========================================================= */

.inner-main {
  padding: 48px 0 64px;
}

.inner-page {
  width: 100%;
}

.inner-title {
  margin: 0;

  font-size: clamp(3rem, 6vw, 5.2rem);
  font-weight: 720;
  line-height: 1;
  letter-spacing: -0.05em;
}

.inner-description {
  margin: 18px 0 0;

  color: var(--muted);

  font-size: 1rem;
  line-height: 1.6;
}

/* ---------- SCHEDULE HEADER ---------- */

.schedule-heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
}

.schedule-timezone {
  font-family: inherit;
  cursor: pointer;

  transition:
    color 0.2s ease,
    border-color 0.2s ease,
    background-color 0.2s ease;

  flex-shrink: 0;

  padding: 9px 14px;

  border: 1px solid var(--border);
  border-radius: 999px;

  color: var(--muted);
  background: var(--surface);

  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.schedule-controls {
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
  gap: 28px;
}

.current-clock {
  text-align: right;
}

.current-clock-date {
  color: var(--muted);

  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.current-clock-time {
  margin-top: 5px;

  color: var(--accent-start);

  font-size: 1.35rem;
  font-weight: 720;
  letter-spacing: 0.04em;
}

.current-clock-zone {
  margin-top: 4px;

  color: var(--muted);

  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.schedule-timezone:hover {
  color: var(--text);
  border-color: var(--muted);
}

/* ---------- GROUP SWITCHER ---------- */

.group-switcher {
  margin-top: 36px;

  display: flex;
  gap: 8px;
}

.group-switcher button {
  min-width: 72px;

  padding: 10px 18px;

  border: 1px solid var(--border);
  border-radius: 999px;

  color: var(--muted);
  background: transparent;

  font: inherit;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.08em;

  cursor: pointer;

  transition:
    color 0.2s ease,
    background-color 0.2s ease,
    border-color 0.2s ease;
}

.group-switcher button:hover {
  color: var(--text);
  border-color: var(--muted);
}

.group-switcher button.active {
  color: var(--bg);
  background: var(--text);
  border-color: var(--text);
}

/* ---------- WEEK ---------- */

.schedule-week {
  margin-top: 34px;

  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.schedule-day {
  min-height: 150px;

  padding: 20px;

  border: 1px solid var(--border);
  border-radius: 18px;

  background: var(--surface);
}

.day-header {
  padding-bottom: 14px;
  margin-bottom: 16px;

  border-bottom: 1px solid var(--border);

  font-size: 0.78rem;
  font-weight: 750;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.day-empty {
  color: var(--muted);

  font-size: 0.88rem;
  line-height: 1.5;
}

/* Make Sunday span the full width on desktop */

.schedule-day:last-child {
  grid-column: 1 / -1;
  min-height: auto;
}

/* =========================================================
   SCHEDULE — TABLET
   ========================================================= */

@media (max-width: 900px) {
  .inner-main {
    padding: 42px 0 54px;
  }

  .schedule-heading {
    align-items: flex-start;
    flex-direction: column;
    gap: 22px;
  }

  .schedule-timezone {
    align-self: flex-start;
  }

  .schedule-week {
    grid-template-columns: 1fr 1fr;
  }
}

.schedule-controls {
  width: 100%;

  align-items: center;
  justify-content: space-between;
}

.current-clock {
  text-align: left;
}

/* =========================================================
   SCHEDULE — MOBILE
   ========================================================= */

@media (max-width: 560px) {
  .inner-main {
    padding: 28px 0 40px;
  }

  .inner-home-link {
    width: 32px;
    height: 32px;

    margin-top: 11px;
  }

  .inner-home-icon {
    width: 16px;
    height: 16px;
  }

  .inner-title {
    font-size: 3rem;
  }

  .inner-description {
    margin-top: 14px;

    font-size: 0.92rem;
    line-height: 1.55;
  }

  .schedule-heading {
    gap: 18px;
  }

  .schedule-timezone {
    padding: 8px 12px;

    font-size: 0.64rem;
  }

  .group-switcher {
    margin-top: 26px;

    width: 100%;
  }

  .group-switcher button {
    flex: 1;
    min-width: 0;

    padding: 10px 8px;
  }

  .schedule-week {
    margin-top: 26px;

    grid-template-columns: 1fr;
    gap: 9px;
  }

  .schedule-day {
    min-height: auto;

    padding: 17px;
    border-radius: 15px;
  }

  .schedule-day:last-child {
    grid-column: auto;
  }

  .day-header {
    margin-bottom: 12px;
    padding-bottom: 11px;
  }
}

.schedule-controls {
  width: 100%;

  gap: 12px;
}

.current-clock {
  min-width: 0;
}

.current-clock-date {
  font-size: 0.58rem;
}

.current-clock-time {
  font-size: 1.15rem;
}

.current-clock-zone {
  font-size: 0.56rem;
}

.schedule-timezone {
  flex-shrink: 0;
}

/* ---------- CLASS SESSIONS ---------- */

.class-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.class-session {
  display: grid;
  grid-template-columns: 105px 1fr;
  gap: 16px;

  padding: 13px 0;

  border-bottom: 1px solid var(--border);
}

.class-session:last-child {
  border-bottom: none;
}

.class-time {
  color: var(--muted);

  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.class-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.class-info strong {
  font-size: 0.9rem;
  font-weight: 700;
}

.class-info span {
  color: var(--muted);

  font-size: 0.76rem;
  line-height: 1.4;
}

.class-status {
  width: fit-content;
  margin-top: 5px;

  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.class-status.is-now {
  color: var(--accent-start);

  animation: deadline-urgent-pulse 1.6s ease-in-out infinite;
}

.class-status.is-now::before {
  content: "●";

  margin-right: 6px;
}

.class-status.is-next {
  color: #43d66f;
}

.class-status.is-next::before {
  content: "→";

  margin-right: 6px;
}

body.light .class-status.is-next {
  color: #168a3f;
}

.class-session.is-now {
  padding-left: 12px;

  box-shadow: inset 3px 0 0 var(--accent-start);
}

.class-session.is-now .class-time {
  color: var(--accent-start);

  animation: deadline-urgent-pulse 1.6s ease-in-out infinite;
}

@keyframes schedule-now-pulse {
  0%,
  100% {
    filter: brightness(1);
    opacity: 1;
  }

  50% {
    filter: brightness(0.2);
    opacity: 0.82;
  }
}

@media (prefers-reduced-motion: reduce) {
  .class-status.is-now,
  .class-session.is-now .class-time {
    animation: none;
  }
}

/* MOBILE */

@media (max-width: 560px) {
  .class-session {
    grid-template-columns: 1fr;
    gap: 5px;

    padding: 12px 0;
  }

  .class-time {
    font-size: 0.72rem;
  }
}

/* =========================================================
   DEADLINES PAGE
   ========================================================= */

.deadlines-list {
  margin-top: 40px;
}

.deadlines-empty {
  padding: 36px;

  border: 1px solid var(--border);
  border-radius: 18px;

  background: var(--surface);
}

.deadlines-empty-title {
  margin: 0;

  font-size: 1rem;
  font-weight: 700;
}

.deadlines-empty-text {
  margin: 8px 0 0;

  color: var(--muted);

  font-size: 0.88rem;
  line-height: 1.6;
}

.deadline-card {
  padding: 22px;

  border: 1px solid var(--border);
  border-radius: 18px;

  background: var(--surface);
}

.deadline-card + .deadline-card {
  margin-top: 12px;
}

.deadline-course {
  color: var(--muted);

  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.deadline-title {
  margin: 10px 0 0;

  font-size: 1.15rem;
  font-weight: 720;
  line-height: 1.35;
}

.deadline-homework-number {
  margin-top: 7px;

  color: var(--muted);

  font-size: 0.72rem;
  font-weight: 650;
  letter-spacing: 0.04em;
}

.deadline-description {
  margin: 10px 0 0;

  color: var(--muted);

  font-size: 0.88rem;
  line-height: 1.6;
}

.deadline-time {
  display: block;

  margin-top: 18px;

  color: var(--accent-start);

  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

@media (max-width: 560px) {
  .deadlines-list {
    margin-top: 28px;
  }

  .deadlines-empty,
  .deadline-card {
    padding: 18px;
    border-radius: 15px;
  }
}

.deadlines-toolbar {
  margin-top: 28px;

  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.deadline-meta {
  margin-top: 20px;
}

.deadline-date-label,
.deadline-countdown-label {
  color: var(--muted);

  font-size: 0.64rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.deadline-time {
  display: block;

  margin-top: 6px;

  color: var(--text);

  font-size: 0.9rem;
  font-weight: 700;
}

.deadline-countdown {
  margin-top: 18px;
  padding-top: 18px;

  border-top: 1px solid var(--border);
}

.deadline-countdown-value {
  display: block;

  margin-top: 7px;

  font-size: 1.15rem;
  font-weight: 720;
  letter-spacing: 0.04em;
}

.deadline-countdown-value.is-safe {
  color: #43d66f;
}

.deadline-countdown-value.is-warning {
  color: #f0b84b;
}

.deadline-countdown-value.is-urgent {
  color: #ff4d5a;

  animation: deadline-urgent-pulse 1.8s ease-in-out infinite;
}

.deadline-countdown-value.is-overdue {
  color: #b64b63;
}

/* Light theme */

body.light .deadline-countdown-value.is-safe {
  color: #168a3f;
}

body.light .deadline-countdown-value.is-warning {
  color: #b76a00;
}

body.light .deadline-countdown-value.is-urgent {
  color: #d82635;
}

body.light .deadline-countdown-value.is-overdue {
  color: #91384d;
}

@keyframes deadline-urgent-pulse {
  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.78;
  }
}

@media (prefers-reduced-motion: reduce) {
  .deadline-countdown-value.is-urgent {
    animation: none;
  }
}

.deadline-assignment-link {
  display: inline-flex;
  align-items: center;

  margin-top: 20px;
  padding: 9px 14px;

  border: 1px solid var(--border);
  border-radius: 10px;

  color: var(--text);
  text-decoration: none;

  font-size: 0.78rem;
  font-weight: 700;

  transition:
    border-color 0.2s ease,
    color 0.2s ease;
}

.deadline-assignment-link:hover {
  border-color: var(--accent-start);
  color: var(--accent-start);
}

@media (max-width: 560px) {
  .deadline-countdown-value {
    font-size: 1rem;
  }
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 14px;
}

.language-switcher {
  display: flex;
  align-items: center;
  gap: 5px;

  padding: 7px 10px;

  border: 1px solid var(--border);
  border-radius: 999px;

  background: var(--surface);
}

.language-option {
  padding: 0;

  border: 0;
  background: transparent;

  color: var(--muted);

  font: inherit;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;

  cursor: pointer;

  transition:
    color 160ms ease,
    opacity 160ms ease;
}

.language-option:hover {
  color: var(--text);
}

.language-option.is-active {
  color: var(--accent-start);
}

.language-divider {
  color: var(--border);
  font-size: 0.7rem;
  user-select: none;
}

@media (max-width: 560px) {
  .header-controls {
    gap: 8px;
  }

  .language-switcher {
    padding: 6px 8px;
  }

  .language-option {
    font-size: 0.62rem;
  }
}