/* --- Global Styles & Variables --- */
:root {
    /* Light theme (default) */
    --bg-color: #f4f4f9;
    --surface-color: #ffffff;
    --primary-color: #3f51b5; /* A professional blue for light mode */
    --text-color: #121212;
    --text-secondary-color: #555;
    --border-color: #e0e0e0;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --hover-bg-color: #f0f0f0;
}

body[data-theme="dark"] {
    --bg-color: #121212;
    --surface-color: #1e1e1e;
    --primary-color: #03dac6; /* Original teal for dark mode */
    --text-color: #e0e0e0;
    --text-secondary-color: #a0a0a0;
    --border-color: #333;
    --shadow-color: rgba(0, 0, 0, 0.5);
    --hover-bg-color: #2a2a2a;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: 'Roboto', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    transition: background-color 0.3s, color 0.3s;
    padding-top: 70px; /* Space for fixed header */
}

/* --- Header --- */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 1rem;
    height: 70px;
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 2px 10px var(--shadow-color);
    z-index: 1000;
    transition: background-color 0.3s, border-color 0.3s;
}

.header-title { font-size: 1.5rem; font-weight: 700; display: flex; align-items: center; gap: 0.75rem; color: var(--primary-color); }
.header-controls { display: flex; align-items: center; gap: 0.5rem; }
.control-btn {
    background: none; border: none; color: var(--text-secondary-color);
    font-size: 1.25rem; padding: 0.5rem; cursor: pointer; border-radius: 50%;
    width: 40px; height: 40px; display: grid; place-items: center;
    transition: background-color 0.2s, color 0.2s;
}
.control-btn:hover { background-color: var(--hover-bg-color); color: var(--primary-color); }

main { flex: 1; width: 100%; max-width: 1200px; margin: 0 auto; padding: 2rem 1rem; }
h1, h2, h3 { font-weight: 700; color: var(--text-color); text-align: center; margin-bottom: 1rem; }
p { text-align: center; color: var(--text-secondary-color); }
.section-description { max-width: 600px; margin: -0.5rem auto 1.5rem auto; }

/* --- User Clock Section --- */
.user-clock-section { text-align: center; margin-bottom: 4rem; padding: 2rem 0; border-radius: 12px; transition: background-color 0.3s; }
#user-location { font-size: 2.5rem; font-weight: 300; color: var(--text-secondary-color); }
.clock-display {
    font-family: var(--clock-font, 'Roboto Mono', monospace);
    font-size: var(--clock-zoom, 8rem);
    font-weight: 700;
    color: var(--clock-color, var(--primary-color));
    letter-spacing: -2px; margin: 0.5rem 0;
    transition: font-size 0.3s, color 0.3s, font-family 0.3s;
}
.date-display {
    font-size: 1.5rem;
    font-family: var(--clock-font, 'Roboto Mono', monospace);
    color: var(--clock-color, var(--text-color));
    transition: color 0.3s, font-family 0.3s;
    height: 2rem; /* Prevent layout shift */
}

/* --- Fullscreen Styling --- */
.user-clock-section:fullscreen {
    background-color: var(--bg-color); display: flex; flex-direction: column;
    justify-content: center; align-items: center; height: 100%; width: 100%;
}
.user-clock-section:fullscreen .clock-display { font-size: 20vw; }
.user-clock-section:fullscreen .date-display { font-size: 5vw; }
.user-clock-section:fullscreen #user-location { font-size: 6vw; }

/* --- Meeting Planner --- */
.meeting-planner-section { background-color: var(--surface-color); padding: 2rem; border-radius: 12px; border: 1px solid var(--border-color); margin-bottom: 4rem; }
.meeting-planner-section h2 { font-size: 2rem; }
.planner-controls { display: flex; justify-content: center; gap: 1rem; margin-bottom: 2rem; }
#planner-city-select, #planner-add-btn {
    padding: 0.8rem 1.2rem; font-size: 1rem; border: 1px solid var(--border-color);
    background-color: var(--bg-color); color: var(--text-color); border-radius: 25px; outline: none;
}
#planner-add-btn { background-color: var(--primary-color); color: white; cursor: pointer; border: none; }
.planner-grid-wrapper { overflow-x: auto; padding-bottom: 1rem; }
#planner-grid { display: grid; grid-template-columns: 150px repeat(24, 40px); gap: 4px; min-width: 1200px; }
.planner-header, .planner-row { display: contents; }
.planner-header-label, .planner-city-name {
    font-weight: 700; padding: 0.5rem; text-align: right; position: sticky; left: 0;
    background: var(--surface-color); display: flex; align-items: center; justify-content: flex-end; gap: 8px;
}
.remove-city-btn { background: none; border: 1px solid var(--border-color); color: var(--text-secondary-color); cursor: pointer; border-radius: 50%; width: 20px; height: 20px; line-height: 18px; text-align: center; }
.planner-hour-label, .planner-hour-cell { background-color: var(--bg-color); border-radius: 4px; text-align: center; font-size: 0.8rem; padding: 0.5rem 0; }
.planner-hour-cell.work { background-color: #2e7d32; } /* Green */
.planner-hour-cell.shoulder { background-color: #ff8f00; } /* Amber */
.planner-hour-cell.off { background-color: #424242; }
body[data-theme="light"] .planner-hour-cell.off { background-color: #e0e0e0; }
.planner-legend { display: flex; justify-content: center; gap: 1.5rem; margin-top: 1.5rem; font-size: 0.9rem; flex-wrap: wrap; }
.legend-box { display: inline-block; width: 14px; height: 14px; border-radius: 3px; vertical-align: middle; margin-right: 5px; }
.legend-box.work { background-color: #2e7d32; }
.legend-box.shoulder { background-color: #ff8f00; }
.legend-box.off { background-color: #424242; }
body[data-theme="light"] .legend-box.off { background-color: #e0e0e0; }

/* --- City Grid Section --- */
.city-grid-section { margin-bottom: 4rem; }
.city-grid-section h2 { font-size: 2rem; margin-bottom: 2rem; }
.search-container { margin: 0 auto 2rem auto; max-width: 600px; }
#city-search-input { width: 100%; padding: 0.8rem 1.2rem; font-size: 1.1rem; border-radius: 25px; border: 1px solid var(--border-color); background-color: var(--surface-color); color: var(--text-color); outline: none; transition: border-color 0.2s, box-shadow 0.2s; }
#city-search-input:focus { border-color: var(--primary-color); box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary-color) 30%, transparent); }
.city-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1rem; }
.city-link { background-color: var(--surface-color); color: var(--text-color); text-decoration: none; padding: 1.25rem 1.5rem; border-radius: 8px; text-align: center; font-size: 1.1rem; transition: transform 0.2s ease-in-out, background-color 0.2s ease; border: 1px solid var(--border-color); }
.city-link:hover { transform: translateY(-5px); background-color: var(--hover-bg-color); color: var(--primary-color); }
.city-link strong { font-weight: 700; }

/* --- Explanation Section --- */
.explanation-section { max-width: 800px; margin: 0 auto 4rem auto; padding: 2rem; background-color: var(--surface-color); border-radius: 8px; border: 1px solid var(--border-color); }
.explanation-section h3 { font-size: 1.8rem; color: var(--primary-color); }
.explanation-section p { font-size: 1.1rem; line-height: 1.7; }

/* --- Footer --- */
footer { width: 100%; padding: 2rem 1rem; border-top: 1px solid var(--border-color); text-align: center; }
footer nav { display: flex; justify-content: center; gap: 1.5rem; margin-bottom: 1rem; flex-wrap: wrap; }
footer nav a { color: var(--text-secondary-color); text-decoration: none; font-size: 1rem; }
footer nav a:hover { color: var(--primary-color); text-decoration: underline; }
footer .copyright { font-size: 0.9rem; color: #666; }
body[data-theme="dark"] footer .copyright { color: #888; }

/* --- Settings Modal --- */
.settings-modal {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%; background-color: rgba(0, 0, 0, 0.6);
    display: flex; justify-content: center; align-items: center; z-index: 1001;
    opacity: 0; visibility: hidden; transition: opacity 0.3s, visibility 0.3s;
}
.settings-modal.visible { opacity: 1; visibility: visible; }
.settings-modal-content {
    background-color: var(--surface-color); padding: 2rem; border-radius: 12px;
    width: 90%; max-width: 500px; position: relative;
    box-shadow: 0 5px 20px var(--shadow-color);
    transform: scale(0.95); transition: transform 0.3s;
}
.settings-modal.visible .settings-modal-content { transform: scale(1); }
.settings-close-btn { position: absolute; top: 10px; right: 15px; background: none; border: none; font-size: 2rem; color: var(--text-secondary-color); cursor: pointer; }
.settings-modal-content h2 { text-align: left; }
.settings-modal-content fieldset { border: none; padding: 0; margin-bottom: 1.5rem; }
.settings-modal-content legend { font-weight: 700; font-size: 1.1rem; margin-bottom: 0.5rem; }
.radio-group, .checkbox-group { display: flex; gap: 1.5rem; align-items: center; }
.radio-group label, .checkbox-group label { cursor: pointer; }
#font-select { width: 100%; padding: 0.7rem; background-color: var(--bg-color); color: var(--text-color); border: 1px solid var(--border-color); border-radius: 5px; font-size: 1rem; }
.color-picker { display: flex; gap: 1rem; }
.color-swatch { width: 35px; height: 35px; border-radius: 50%; cursor: pointer; border: 3px solid transparent; transition: border-color 0.2s; }
.color-swatch.selected { border-color: var(--primary-color); }

/* --- Responsive Adjustments --- */
@media (max-width: 768px) {
    body { padding-top: 60px; }
    header { height: 60px; }
    .header-title { font-size: 1.2rem; }
    .control-btn { font-size: 1.1rem; width: 35px; height: 35px; }
    .clock-display { --clock-zoom: 5rem; }
    #user-location { font-size: 1.8rem; }
    h2 { font-size: 1.8rem; }
    .city-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
    .header-title span { display: none; } /* Hide text on very small screens */
    .clock-display { --clock-zoom: 4rem; }
    #user-location { font-size: 1.5rem; }
    .planner-controls { flex-direction: column; }
    .planner-grid { grid-template-columns: 120px repeat(24, 35px); min-width: 980px; }
    .planner-city-name { font-size: 0.9rem; }
}

/* --- Content Sections (How-it-works, Story, FAQ) --- */
.how-it-works-section,
.story-section, 
.faq-section {
  max-width: auto;
  margin: 3rem auto;
  padding: 1.5rem 2rem;
  background-color: var(--surface-color);
  border-radius: 12px;
  border: 1px solid var(--border-color);
  box-shadow: 0 2px 8px var(--shadow-color);
  color: var(--text-color);
  font-family: 'Roboto', sans-serif;
  line-height: 1.7;
}

.how-it-works-section h2,
.story-section h2, 
.faq-section h2 {
  font-size: 2rem;
  color: var(--primary-color);
  text-align: center;
  margin-bottom: 1.5rem;
  font-weight: 700;
}

.how-it-works-section h3,
.story-section h3 {
  font-size: 1.5rem;
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
  font-weight: 600;
  color: var(--primary-color);
  text-align: left;
}
.story-section p {
    text-align: left;
}
.story-section ul {
    text-align: left;
    padding-left: 2rem;
}

.how-it-works-section p,
.how-it-works-section li,
.faq-section dd {
  font-size: 1.1rem;
  margin-bottom: 1rem;
  color: var(--text-secondary-color);
  text-align: left;
}

.faq-section dl dt {
  font-weight: 700;
  margin-top: 1rem;
  color: var(--text-color);
  text-align: left;
}

.faq-section dl dd {
  margin-left: 1rem;
  margin-bottom: 0.7rem;
}

.how-it-works-section ul,
.how-it-works-section ol {
    padding-left: 2rem;
    margin-bottom: 1rem;
}
.how-it-works-section li {
    margin-bottom: 0.5rem;
}
.how-it-works-section code {
    background-color: var(--bg-color);
    padding: 0.2em 0.4em;
    border-radius: 4px;
    font-family: 'Roboto Mono', monospace;
    font-size: 0.95em;
}

.infographic-placeholder {
    background-color: var(--bg-color);
    border: 2px dashed var(--border-color);
    padding: 2rem;
    text-align: center;
    margin: 1.5rem 0;
    border-radius: 8px;
    color: var(--text-secondary-color);
}

/* Responsive adjustments for content sections */
@media (max-width: 768px) {
  .how-it-works-section,
  .story-section, 
  .faq-section {
    margin: 2rem 1rem;
    padding: 1rem 1.2rem;
  }
  .how-it-works-section h2,
  .story-section h2, 
  .faq-section h2 {
    font-size: 1.6rem;
  }
  .how-it-works-section h3,
  .story-section h3 {
    font-size: 1.3rem;
  }
}