/* =========================================================================
   Student Attendance Management System — stylesheet
   ========================================================================= */

/* ---------- Design tokens ---------- */
:root {
  --green:      #0b7a3b;
  --green-dark: #075a2b;
  --teal:       #0d7f7f;
  --pink:       #d81b8c;
  --red:        #c0392b;
  --amber:      #f0ad4e;

  --bg:      #f2f6f4;
  --surface: #ffffff;
  --border:  #d9e2de;
  --text:    #1e2a25;
  --muted:   #5d6d67;

  --radius:    10px;
  --radius-lg: 16px;
  --shadow:    0 2px 10px rgba(16, 46, 33, 0.08);
  --transition: 150ms ease;
}

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

html {
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.5;
  color: var(--text);
  background-color: var(--bg);
}

main {
  flex: 1 1 auto;
  width: 100%;
}

img {
  display: block;
  max-width: 100%;
}

/* ---------- Accessibility helper ---------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- Header / footer ---------- */
.heading {
  background-color: var(--green);
  color: #fff;
  text-align: center;
  padding: 20px;
  box-shadow: var(--shadow);
}

.heading h1 {
  font-size: clamp(1.1rem, 3vw, 2rem);
}

.heading__sub {
  margin-top: 4px;
  font-size: 0.95rem;
  opacity: 0.9;
}

footer {
  background-color: var(--green);
  color: #fff;
  text-align: center;
  font-size: 0.95rem;
  padding: 18px;
}

#school {
  padding: 24px 16px 8px;
  font-size: clamp(1.3rem, 4vw, 2.6rem);
  font-weight: 700;
  color: var(--pink);
  text-align: center;
}

/* ---------- Shared form controls ---------- */
input[type="text"],
input[type="password"],
input[type="search"],
input[type="tel"],
input[type="number"] {
  width: 100%;
  padding: 12px 14px;
  font: inherit;
  color: inherit;
  background-color: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

input:focus-visible {
  outline: none;
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(13, 127, 127, 0.18);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  font: inherit;
  font-weight: 600;
  color: var(--text);
  background-color: transparent;
  border: 1px solid transparent;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color var(--transition), color var(--transition),
              border-color var(--transition), transform var(--transition);
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background-color: var(--amber);
  border-color: #d99a3f;
}

.btn-primary:hover {
  background-color: var(--green);
  border-color: var(--green);
  color: #fff;
}

.btn-ghost {
  color: var(--green);
  border-color: var(--green);
}

.btn-ghost:hover {
  background-color: var(--green);
  color: #fff;
}

.form-error {
  min-height: 1.3em;
  margin-top: 8px;
  font-size: 0.9rem;
  color: var(--red);
}

/* =========================================================================
   Login page
   ========================================================================= */
.login {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: stretch;
  max-width: 1100px;
  margin: 24px auto 40px;
  padding: 0 20px;
}

.login .image {
  overflow: hidden;
  min-height: 320px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.login .image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.right {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 24px;
  background-color: #dbe9ee;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.login_head {
  width: 100%;
  max-width: 420px;
  margin: 0 auto 24px;
  padding: 12px;
  font-size: clamp(1.4rem, 3vw, 2rem);
  color: #fff;
  text-align: center;
  background-color: var(--green);
  border-radius: var(--radius-lg);
}

#form {
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: 420px;
  margin: 0 auto;
}

#form label {
  margin-top: 10px;
  margin-bottom: 4px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--muted);
}

#submit {
  margin-top: 18px;
}

/* =========================================================================
   Student dashboard
   ========================================================================= */
.studentData {
  display: flex;
  justify-content: center;
  padding: 18px 20px;
  background-color: var(--green);
}

#form1 {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  width: 100%;
  max-width: 1100px;
}

#form1 input {
  flex: 1 1 160px;
  width: auto;
  min-width: 140px;
}

#form1 .btn {
  flex: 0 0 auto;
}

.feedback {
  max-width: 1100px;
  min-height: 1.4em;
  margin: 10px auto 0;
  padding: 0 20px;
  font-size: 0.9rem;
  text-align: center;
  color: var(--muted);
}

.feedback--success { color: var(--green); }
.feedback--error   { color: var(--red); }

/* ---------- Toolbar ---------- */
.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  max-width: 1100px;
  margin: 16px auto 0;
  padding: 0 20px;
}

.stats {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.stat {
  padding: 6px 14px;
  font-size: 0.9rem;
  color: var(--muted);
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
}

.stat strong {
  color: var(--text);
}

#search {
  flex: 1 1 200px;
  max-width: 280px;
}

/* ---------- Table ---------- */
.table-wrap {
  max-width: 1100px;
  margin: 20px auto 40px;
  padding: 0 20px;
  overflow-x: auto;
}

table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  background-color: var(--surface);
  box-shadow: var(--shadow);
}

th,
td {
  padding: 12px 14px;
  text-align: center;
  border-bottom: 1px solid var(--border);
}

thead th {
  font-size: 0.85rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  white-space: nowrap;
  color: #fff;
  background-color: var(--teal);
}

tbody tr:hover {
  background-color: #f3f8f6;
}

tbody tr:last-child td {
  border-bottom: none;
}

td.empty {
  padding: 28px 14px;
  font-style: italic;
  color: var(--muted);
}

/* ---------- Status badge ---------- */
.badge {
  display: inline-block;
  min-width: 92px;
  padding: 4px 10px;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: capitalize;
  border-radius: 999px;
}

.badge.present  { color: var(--green); background-color: #e2f5e9; }
.badge.absent   { color: var(--red);   background-color: #fdeaea; }
.badge.unmarked { color: var(--muted); background-color: #eef1f0; }

/* ---------- Row action buttons ---------- */
.actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
}

.btn-sm {
  min-width: 36px;
  padding: 6px 10px;
  font: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  background-color: #fff;
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  transition: background-color var(--transition), color var(--transition),
              border-color var(--transition);
}

.btn-sm:hover {
  background-color: #eef1f0;
}

.btn-sm.present[aria-pressed="true"] {
  color: #fff;
  background-color: var(--green);
  border-color: var(--green);
}

.btn-sm.absent[aria-pressed="true"] {
  color: #fff;
  background-color: var(--red);
  border-color: var(--red);
}

.btn-sm.danger {
  color: var(--red);
  border-color: #f0c9c4;
}

.btn-sm.danger:hover {
  color: #fff;
  background-color: var(--red);
  border-color: var(--red);
}

/* ---------- Responsive ---------- */
@media (max-width: 800px) {
  .login {
    grid-template-columns: 1fr;
  }

  .login .image {
    min-height: 200px;
  }
}

@media (max-width: 600px) {
  .toolbar {
    justify-content: center;
  }

  #search {
    max-width: none;
  }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}