/* Main stylesheet for HTC Sign Up System */
/* Shared styles used across all pages */

/* Color palette - referenced by main.css, staff.css, student.css, and
   inline template styles, so the site's colors live in one place. */
:root {
  /* Brand */
  --color-primary: #4a90d9;
  --color-primary-hover: #3a7bc8;
  --color-accent: #1a73e8;
  --color-accent-hover: #1558b0;

  /* Buttons */
  --color-secondary: #6c757d;
  --color-secondary-hover: #5a6268;
  --color-danger: #d9534f;
  --color-danger-hover: #c9302c;
  --color-success: #5cb85c;
  --color-success-hover: #449d44;
  --color-selected: #337ab7;

  /* Text & neutrals */
  --color-text: #333;
  --color-text-muted: #555;
  --color-text-light: #666;
  --color-text-lighter: #aaa;
  --color-heading: #222;
  --color-white: #fff;
  --color-bg-page: #ffffff;
  --color-bg-light: #f8f9fa;
  --color-border: #ddd;
  --color-border-light: #ccc;
  --color-border-lighter: #eee;
  --color-border-dark: #999;

  /* Dark header / sidebar */
  --color-dark: #333;
  --color-sidebar-bg: #003060;
  --color-sidebar-border: #34495e;
  --color-sidebar-text: #ecf0f1;
  --color-sidebar-muted: #95a5a6;
  --color-sidebar-icon: #bdc3c7;
  --color-sidebar-active: #3498db;

  /* Alerts (Bootstrap-style) */
  --color-success-bg: #d4edda;
  --color-success-text: #155724;
  --color-success-border: #c3e6cb;
  --color-danger-bg: #f8d7da;
  --color-danger-text: #721c24;
  --color-danger-border: #f5c6cb;
  --color-warning-bg: #fff3cd;
  --color-warning-text: #856404;
  --color-warning-border: #ffeeba;
  --color-info-bg: #d1ecf1;
  --color-info-text: #0c5460;
  --color-info-border: #bee5eb;
  --color-same-exam-bg: #f2dede;

  /* Computer map occupancy (Step 07) - walk-in uses navy, distinct from
     the teal-ish --color-info-* trio used elsewhere. */
  --color-black: #000;
  --color-walkin-bg: #d6e9f9;
  --color-walkin-text: #001f54;
  --color-walkin-border: #001f54;

  /* Announcement banner */
  --color-announcement-bg: #e7f3ff;
  --color-announcement-border: #b3d7ff;

  /* Dev-only "view as" widget active-role indicator */
  --color-active-indicator: #4caf50;
}

/* Reset and base styles */
* {
  box-sizing: border-box;
}

html {
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  margin: 0;
  padding: 0;
  background: var(--color-bg-page);
  color: var(--color-text);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.site-footer {
  text-align: center;
  margin-top: auto;
  padding: 10px 0;
}

.app-version {
  font-size: 0.75rem;
  font-weight: normal;
  opacity: 0.7;
}

.footer-copyright {
  font-size: 0.75rem;
  opacity: 0.7;
  margin-top: 4px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  margin-top: 0;
  margin-bottom: 1rem;
  color: var(--color-heading);
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }

p {
  line-height: 1.6;
  margin-bottom: 1rem;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* A <button> that should read as an inline text link (e.g. a POST-only
   logout action that can't be a plain <a href>). */
.link-button {
  background: none;
  border: none;
  padding: 0;
  font: inherit;
  cursor: pointer;
}

/* Buttons */
.btn {
  display: inline-block;
  box-sizing: border-box;
  min-width: 160px;
  padding: 10px 20px;
  background: var(--color-primary);
  color: var(--color-white);
  border: none;
  border-radius: 4px;
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  line-height: 1.4;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s;
}

.btn:hover {
  background: var(--color-primary-hover);
}

.btn-secondary {
  background: var(--color-secondary);
}

.btn-secondary:hover {
  background: var(--color-secondary-hover);
}

.btn-danger {
  background: var(--color-danger);
}

.btn-danger:hover {
  background: var(--color-danger-hover);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-small {
  padding: 5px 10px;
}

/* Forms */
form {
  margin-bottom: 1rem;
}

.form-group {
  margin-bottom: 1rem;
}

.form-row {
  display: flex;
  gap: 1rem;
}

.form-row .form-group {
  flex: 1;
}

label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

input[type="text"],
input[type="password"],
input[type="email"],
input[type="number"],
textarea,
select {
  width: 100%;
  padding: 10px;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  font-size: 14px;
  font-family: inherit;
}

input[type="text"]:focus,
input[type="password"]:focus,
input[type="email"]:focus,
input[type="number"]:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--color-primary);
}

/* Cards */
.card {
  background: var(--color-white);
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  margin-bottom: 1rem;
}

.card-header {
  border-bottom: 1px solid var(--color-border-lighter);
  padding-bottom: 10px;
  margin-bottom: 15px;
}

.card-body {
  padding: 0;
}

/* Course sign-up cards */
.course-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin: 1rem 0;
}

.course-card {
  border: 1px solid var(--color-border-dark);
  padding: 20px;
  background: var(--color-white);
}

/* Exam sign-up cards - same treatment as the course cards above */
.exam-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin: 1rem 0;
}

.exam-card {
  border: 1px solid var(--color-border-dark);
  padding: 20px;
  background: var(--color-white);
}

.exam-card.selected {
  border: 2px solid var(--color-primary);
}

/* Alerts */
.alert {
  padding: 15px 20px;
  border-radius: 4px;
  margin-bottom: 1rem;
}

.alert-success {
  background: var(--color-success-bg);
  color: var(--color-success-text);
  border: 1px solid var(--color-success-border);
}

.alert-error,
.alert-danger {
  background: var(--color-danger-bg);
  color: var(--color-danger-text);
  border: 1px solid var(--color-danger-border);
}

.alert-warning {
  background: var(--color-warning-bg);
  color: var(--color-warning-text);
  border: 1px solid var(--color-warning-border);
}

.overdue-label {
  font-weight: bold;
  color: var(--color-danger);
}

.overdue-minutes {
  font-weight: normal;
  color: var(--color-danger);
}

.alert-info {
  background: var(--color-info-bg);
  color: var(--color-info-text);
  border: 1px solid var(--color-info-border);
}

/* Utility classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mt-5 { margin-top: 2.5rem; }
.mt-6 { margin-top: 3rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }
.mb-5 { margin-bottom: 2.5rem; }
.mb-6 { margin-bottom: 3rem; }