/* =========================================================
   CDU Course Application — Stylesheet
   Design tokens: Top End / Darwin Harbour sunset palette
   ========================================================= */

:root {
  /* Colour tokens */
  --color-ink: #16242a;
  --color-teal-deep: #0b2b30;
  --color-teal: #143b3f;
  --color-sand: #f7f3ea;
  --color-sand-deep: #ede6d6;
  --color-sunset-1: #f7c46c;
  --color-sunset-2: #e2722f;
  --color-sunset-3: #c1432e;
  --color-success: #2f7d52;
  --color-success-bg: #e7f3ec;
  --color-error: #b3261e;
  --color-error-bg: #fbeae8;
  --color-border: #d8d2c2;
  --color-white: #ffffff;

  /* Type */
  --font-display:
    "Iowan Old Style", "Palatino Linotype", Georgia, "Times New Roman", serif;
  --font-body:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    Arial, sans-serif;

  /* Layout */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 18px;
  --shadow-card: 0 12px 32px rgba(11, 43, 48, 0.12);
  --max-width: 400px;
}

/* ---------- Reset & base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--color-sand);
  color: var(--color-ink);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

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

h1,
h2,
h3 {
  font-family: var(--font-display);
  margin: 0;
}

a {
  color: var(--color-sunset-3);
}

p {
  display: block;
  margin-block-start: 2px;
  margin-block-end: 2px;
  margin-inline-start: 0px;
  margin-inline-end: 0px;
  unicode-bidi: isolate;
}

/* Visible focus ring everywhere, including custom controls */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid var(--color-sunset-2);
  outline-offset: 2px;
}

/* ---------- Page shell ---------- */
.page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0 16px 48px;
}

.site-header {
  width: 100%;
  background: var(--color-teal-deep);
  color: var(--color-sand);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.site-header__mark {
  width: 160px;
}

.site-header__eyebrow {
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-size: 0.72rem;
  color: var(--color-sunset-1);
  margin-bottom: 6px;
}

.site-header h1 {
  font-size: clamp(1.6rem, 4vw, 2.3rem);
  font-weight: 600;
  max-width: 28ch;
}

.site-header p {
  max-width: 46ch;
  color: #cfe4e2;
  font-size: 0.96rem;
}

/* ---------- Card / form container ---------- */
main {
  width: 100%;
  max-width: var(--max-width);
}

.form-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 28px 24px 32px;
}

@media (min-width: 600px) {
  .form-card {
    padding: 20px 28px 24px;
  }
}

fieldset {
  border: none;
  margin: 0 0 2px;
  padding: 0;
}

fieldset:last-of-type {
  margin-bottom: 0;
}

legend {
  font-family: var(--font-display);
  font-size: 1.18rem;
  font-weight: 600;
  padding: 0;
  margin-bottom: 4px;
  color: var(--color-teal-deep);
}

.section-intro {
  font-size: 0.88rem;
  color: #5c6a6c;
  margin: 2px 0 1px;
}

/* ---------- Field layout ---------- */
.field-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 5px;
}

@media (min-width: 600px) {
  .field-grid--two {
    grid-template-columns: 1fr 1fr;
  }
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  position: relative;
}

.field label,
.field legend.group-label {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--color-ink);
}

.required-mark {
  color: var(--color-sunset-3);
  margin-left: 2px;
}

.field-hint {
  font-size: 0.78rem;
  color: #6b7878;
}

input[type="text"],
input[type="email"],
input[type="tel"],
input[type="password"],
input[type="date"] {
  font: inherit;
  font-size: 1rem;
  padding: 11px 12px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-white);
  color: var(--color-ink);
  width: 100%;
  transition:
    border-color 0.15s ease,
    box-shadow 0.15s ease;
}

input::placeholder {
  color: #9aa3a3;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="tel"]:focus,
input[type="password"]:focus,
input[type="date"]:focus {
  border-color: var(--color-sunset-2);
  box-shadow: 0 0 0 3px rgba(226, 114, 47, 0.16);
}

.field.is-valid input {
  border-color: var(--color-success);
}
.field.is-invalid input {
  border-color: var(--color-error);
}

.field-message {
  font-size: 0.8rem;
  display: flex;
  align-items: center;
  gap: 5px;
  height: 0;
  overflow: hidden;
  opacity: 0;
}

.field-message.error {
  color: var(--color-error);
}
.field-message.success {
  color: var(--color-success);
}

/* ---------- Mobile number (prefix + digits) ---------- */
.mobile-input {
  display: flex;
  align-items: stretch;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--color-white);
}

.mobile-input__prefix {
  display: flex;
  align-items: center;
  padding: 0 12px;
  background: var(--color-sand-deep);
  font-weight: 600;
  color: var(--color-teal-deep);
  border-right: 1.5px solid var(--color-border);
}

.mobile-input input {
  border: none;
  border-radius: 0;
}

.mobile-input input:focus {
  box-shadow: none;
}

.mobile-input:focus-within {
  border-color: var(--color-sunset-2);
  box-shadow: 0 0 0 3px rgba(226, 114, 47, 0.16);
}

.field.is-valid .mobile-input {
  border-color: var(--color-success);
}
.field.is-invalid .mobile-input {
  border-color: var(--color-error);
}

/* ---------- Student number (segmented OTP-style) ---------- */
.otp-group {
  display: flex;
  gap: 8px;
  font-size: 1.2rem;
  align-items: center;
  justify-content: center;
}

.otp-group input {
  width: 42px;
  height: 50px;
  text-align: center;
  font-size: 1.2rem;
  font-weight: 600;
  padding: 0;
}

@media (min-width: 400px) {
  .otp-group input {
    width: 46px;
  }
}

/* ---------- Password ---------- */
.password-field {
  position: relative;
}

.password-field input {
  padding-right: 44px;
}

.password-toggle {
  position: absolute;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  cursor: pointer;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-teal);
  padding: 6px 8px;
  border-radius: var(--radius-sm);
}

.password-toggle:hover {
  background: var(--color-sand-deep);
}

.password-checklist {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px 12px;
  font-size: 0.78rem;
  color: #6b7878;
}

.password-checklist li {
  display: flex;
  align-items: center;
  gap: 6px;
}

.password-checklist li::before {
  content: "";
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 1.5px solid var(--color-border);
  flex-shrink: 0;
}

.password-checklist li.met {
  color: var(--color-success);
}

.password-checklist li.met::before {
  content: "✓";
  background: var(--color-success);
  border-color: var(--color-success);
  color: var(--color-white);
  font-size: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.strength-meter {
  height: 6px;
  border-radius: 4px;
  background: var(--color-sand-deep);
  overflow: hidden;
  margin-top: 2px;
}

.strength-meter__bar {
  height: 100%;
  width: 0%;
  background: var(--color-error);
  transition:
    width 0.2s ease,
    background-color 0.2s ease;
}

/* ---------- Address autocomplete ---------- */
.address-field {
  position: relative;
}

.address-suggestions {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  margin-top: 4px;
  background: var(--color-white);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-card);
  max-height: 240px;
  overflow-y: auto;
  z-index: 20;
  display: none;
}

.address-suggestions.is-open {
  display: block;
}

.address-suggestions__item {
  padding: 10px 12px;
  font-size: 0.88rem;
  cursor: pointer;
  border-bottom: 1px solid var(--color-sand-deep);
}

.address-suggestions__item:last-child {
  border-bottom: none;
}

.address-suggestions__item:hover,
.address-suggestions__item.is-active {
  background: var(--color-sand-deep);
}

.address-suggestions__empty {
  padding: 10px 12px;
  font-size: 0.85rem;
  color: #6b7878;
}

.address-suggestions__badge {
  display: inline-block;
  margin-left: 8px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #6b7878;
  background: var(--color-sand-deep);
  border-radius: 4px;
  padding: 1px 5px;
  vertical-align: middle;
}

.address-status {
  font-size: 0.78rem;
  color: #6b7878;
}

/* ---------- Checkbox ---------- */
.checkbox-field {
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.checkbox-field input[type="checkbox"] {
  width: 20px;
  height: 20px;
  margin-top: 2px;
  flex-shrink: 0;
  accent-color: var(--color-sunset-2);
}

.checkbox-field label {
  font-weight: 400;
  font-size: 0.92rem;
}

/* ---------- Submit area ---------- */
.submit-area {
  margin-top: 8px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.btn-register {
  font: inherit;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--color-white);
  background: linear-gradient(
    135deg,
    var(--color-sunset-2),
    var(--color-sunset-3)
  );
  border: none;
  border-radius: var(--radius-sm);
  padding: 14px 20px;
  cursor: pointer;
  transition:
    opacity 0.15s ease,
    transform 0.05s ease;
}

.btn-register:hover:not(:disabled) {
  opacity: 0.92;
}
.btn-register:active:not(:disabled) {
  transform: translateY(1px);
}

.btn-register:disabled {
  background: var(--color-border);
  color: #8a8a8a;
  cursor: not-allowed;
}

.form-summary {
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  font-size: 0.88rem;
  display: none;
}

.form-summary.is-error {
  display: block;
  background: var(--color-error-bg);
  color: var(--color-error);
}

.form-summary.is-success {
  display: block;
  background: var(--color-success-bg);
  color: var(--color-success);
}

.privacy-note {
  font-size: 0.78rem;
  color: #6b7878;
  text-align: center;
}

/* ---------- Footer ---------- */
.site-footer {
  margin-top: 28px;
  font-size: 0.78rem;
  color: #6b7878;
  text-align: center;
}

/* ---------- Utility ---------- */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    animation: none !important;
  }
}