/* Global Styles */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #f5f5f5;
  --text: #212121;
  --accent: #607d8b;
  --secondary-bg: #eeeeee;
  --border: #bdbdbd;
  --font-mono: "Geist Mono", "Fira Code", "Cascadia Code", monospace;
  --font-sans: "Geist", system-ui, -apple-system, sans-serif;
  --transition: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  --dark-bg-darken: rgba(0, 0, 0, 0.35);
  --dark-secondary-darken: rgba(0, 0, 0, 0.25);
}

@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]):not([data-theme="dark"]) {
    --bg: #111111;
    --text: #e8e8e8;
    --secondary-bg: #1e1e1e;
    --border: #333333;
    --accent: #90a4ae;
  }
}

html[data-theme="dark"] {
  --bg: #111111;
  --text: #e8e8e8;
  --secondary-bg: #1e1e1e;
  --border: #333333;
  --accent: #90a4ae;
}

html[data-theme="light"] {
  --bg: #f5f5f5;
  --text: #212121;
  --secondary-bg: #eeeeee;
  --border: #bdbdbd;
  --accent: #607d8b;
}

html {
  font-family: var(--font-sans);
  background-color: var(--bg);
  color: var(--text);
  transition: background-color var(--transition), color var(--transition);
}

body {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
select, input { font-family: inherit; }

/* Page Layout */
.page {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 2rem;
  border-bottom: 1px solid var(--border);
  transition: border-color var(--transition);
  flex-wrap: wrap;
  gap: 1rem;
}

.header-left { display: flex; align-items: center; gap: 1.5rem; }

.logo {
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  transition: color var(--transition);
}

.nav-link {
  font-size: 0.8rem;
  font-weight: 600;
  opacity: 0.55;
  transition: opacity 0.2s;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.nav-link:hover { opacity: 1; }

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

.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 3rem 2rem;
  gap: 4rem;
  max-width: 900px;
  width: 100%;
  margin: 0 auto;
}

/* Current Period */
.current-period { display: flex; flex-direction: column; gap: 0.35rem; }
.period-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  opacity: 0.5;
}
.period-name {
  font-size: clamp(1.25rem, 4vw, 2rem);
  font-weight: 800;
  color: var(--accent);
  transition: color var(--transition);
}

/* Event Block */
.event-block {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  padding: 2rem;
  background-color: var(--secondary-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  transition: background-color var(--transition), border-color var(--transition);
}
.event-header { display: flex; align-items: flex-start; justify-content: space-between; flex-wrap: wrap; gap: 0.75rem; }
.event-name { font-size: clamp(1.25rem, 4vw, 2rem); font-weight: 700; margin-top: 0.2rem; }
.event-meta { display: flex; flex-direction: column; align-items: flex-end; gap: 0.35rem; }
.event-date { font-size: 0.85rem; opacity: 0.6; font-weight: 500; }
.event-link {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--accent);
  opacity: 0.8;
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: opacity 0.2s;
}
.event-link:hover { opacity: 1; }

/* Upcoming List */
.upcoming-list { display: flex; flex-direction: column; gap: 0.75rem; }
.upcoming-title {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  opacity: 0.5;
  margin-bottom: 0.25rem;
}
.upcoming-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  background-color: var(--secondary-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  transition: background-color var(--transition), border-color 0.2s, transform 0.15s;
}
.upcoming-item:hover { border-color: var(--accent); transform: translateX(4px); }
.upcoming-item-name { font-weight: 600; font-size: 0.95rem; }
.upcoming-item-meta { display: flex; align-items: center; gap: 1rem; font-size: 0.8rem; opacity: 0.6; }

/* Custom Banner */
.custom-banner {
  padding: 1.25rem 1.5rem;
  background-color: var(--secondary-bg);
  border: 2px dashed var(--border);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: background-color var(--transition), border-color var(--transition);
}
.custom-label {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  opacity: 0.5;
}

/* Countdown */
.countdown { display: flex; gap: 1.5rem; align-items: flex-end; flex-wrap: wrap; }
.countdown-unit { display: flex; flex-direction: column; align-items: center; gap: 0.25rem; min-width: 4rem; }
.countdown-value {
  font-family: var(--font-mono);
  font-size: clamp(2.5rem, 8vw, 5rem);
  font-weight: 700;
  line-height: 1;
  color: var(--banner-accent, var(--accent));
  letter-spacing: -0.02em;
  transition: color var(--transition);
}
.countdown-label {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  opacity: 0.6;
  color: inherit;
}
.countdown-separator {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 6vw, 4rem);
  font-weight: 300;
  color: var(--banner-accent, var(--accent));
  opacity: 0.4;
  padding-bottom: 0.3rem;
  transition: color var(--transition);
}
.countdown-large .countdown-value { font-size: clamp(3.5rem, 12vw, 8rem); }
.countdown-large .countdown-label { font-size: 0.75rem; }
.countdown-large .countdown-separator { font-size: clamp(3rem, 10vw, 7rem); }

/* Theme Toggle */
.theme-toggle-btn {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--secondary-bg);
  color: var(--text);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  transition: border-color 0.2s, background-color var(--transition), color var(--transition);
  white-space: nowrap;
}
.theme-toggle-btn:hover { border-color: var(--accent); }

/* Timezone Selector */
.tz-selector { display: flex; align-items: center; gap: 0.5rem; }
.tz-label { font-size: 0.75rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; opacity: 0.6; white-space: nowrap; }
.tz-select {
  appearance: none;
  background-color: var(--secondary-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.3rem 2rem 0.3rem 0.65rem;
  cursor: pointer;
  transition: border-color 0.2s, background-color var(--transition), color var(--transition);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23666' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.5rem center;
}
.tz-select:hover { border-color: var(--accent); }

/* Footer */
.footer {
  padding: 1.5rem 2rem;
  border-top: 1px solid var(--border);
  font-size: 0.75rem;
  opacity: 0.45;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  transition: border-color var(--transition);
}
.footer-link { text-decoration: underline; text-underline-offset: 2px; }

/* Custom Page Styles */
.page-title {
  font-size: clamp(1.5rem, 5vw, 2.5rem);
  font-weight: 800;
  color: var(--accent);
  transition: color var(--transition);
  margin-bottom: 2rem;
}

.form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  padding: 2rem;
  background: var(--secondary-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  transition: background-color var(--transition), border-color var(--transition);
}

.field-group { display: flex; flex-direction: column; gap: 0.4rem; }

.label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  opacity: 0.55;
}

.input {
  padding: 0.6rem 0.85rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 0.95rem;
  width: 100%;
  transition: border-color 0.2s, background-color var(--transition), color var(--transition);
}
.input:focus { outline: 2px solid var(--accent); outline-offset: 2px; border-color: var(--accent); }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }

.submit-btn {
  padding: 0.7rem 1.5rem;
  background: var(--accent);
  color: var(--bg);
  border: none;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  align-self: flex-start;
  transition: opacity 0.2s, background-color var(--transition);
}
.submit-btn:hover { opacity: 0.85; }
.submit-btn:disabled { opacity: 0.4; cursor: not-allowed; }

.share-box { display: flex; flex-direction: column; gap: 0.5rem; margin-top: 2rem; }
.share-label { font-size: 0.7rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; opacity: 0.55; }
.share-row { display: flex; gap: 0.5rem; }
.share-input {
  flex: 1;
  padding: 0.5rem 0.75rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 0.82rem;
  font-family: var(--font-mono);
  transition: background-color var(--transition), color var(--transition), border-color var(--transition);
}
.copy-btn {
  padding: 0.5rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--secondary-bg);
  color: var(--text);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: border-color 0.2s, background-color var(--transition);
}
.copy-btn:hover { border-color: var(--accent); }

.saved-section { display: flex; flex-direction: column; gap: 1rem; margin-top: 3rem; }
.saved-title { font-size: 0.7rem; font-weight: 700; letter-spacing: 0.15em; text-transform: uppercase; opacity: 0.5; }
.saved-list { display: flex; flex-direction: column; gap: 0.6rem; }
.saved-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 1.1rem;
  background: var(--secondary-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  gap: 1rem;
  transition: background-color var(--transition), border-color var(--transition);
}
.saved-item-left { display: flex; flex-direction: column; gap: 0.2rem; min-width: 0; }
.saved-item-name { font-weight: 600; font-size: 0.95rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.saved-item-date { font-size: 0.78rem; opacity: 0.55; }
.saved-item-right { display: flex; align-items: center; gap: 0.5rem; flex-shrink: 0; }
.saved-days { font-family: var(--font-mono); font-size: 0.85rem; font-weight: 700; color: var(--accent); transition: color var(--transition); }
.open-btn {
  padding: 0.3rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  font-size: 0.75rem;
  font-weight: 600;
  text-decoration: none;
  transition: border-color 0.2s, background-color var(--transition);
}
.open-btn:hover { border-color: var(--accent); }
.delete-btn {
  padding: 0.3rem 0.6rem;
  border: 1px solid transparent;
  border-radius: 6px;
  background: none;
  color: var(--text);
  font-size: 0.75rem;
  opacity: 0.35;
  cursor: pointer;
  transition: opacity 0.2s;
}
.delete-btn:hover { opacity: 0.8; border-color: var(--border); }
.empty-msg { font-size: 0.85rem; opacity: 0.4; padding: 1rem 0; }