/*
 * Teacher Application System — Frontend Styles
 * Brand: Primary #244092 | Accent #EF3E26
 * Font pairing: DM Serif Display + DM Sans
 * ================================================================
 */

@import url('https://fonts.googleapis.com/css2?family=DM+Serif+Display:ital@0;1&family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700;1,9..40,400&display=swap');

/* ──────────────────────────────────────────────────────────────
   1. DESIGN TOKENS
   ────────────────────────────────────────────────────────────── */
:root {
  /* Brand */
  --tas-primary:        #244092;
  --tas-primary-dark:   #1a3070;
  --tas-primary-light:  #e8edf8;
  --tas-primary-subtle: #f0f4ff;
  --tas-accent:         #EF3E26;
  --tas-accent-dark:    #d43320;
  --tas-accent-light:   #fff1ef;

  /* Neutrals */
  --tas-white:          #ffffff;
  --tas-gray-50:        #f9fafb;
  --tas-gray-100:       #f3f4f6;
  --tas-gray-200:       #e5e7eb;
  --tas-gray-400:       #9ca3af;
  --tas-gray-600:       #4b5563;
  --tas-gray-800:       #1f2937;
  --tas-text:           #111827;

  /* Semantic */
  --tas-success:        #059669;
  --tas-success-bg:     #ecfdf5;
  --tas-error:          #dc2626;
  --tas-error-bg:       #fef2f2;
  --tas-warning:        #d97706;

  /* Shape */
  --tas-radius-xs:  4px;
  --tas-radius-sm:  8px;
  --tas-radius:     12px;
  --tas-radius-lg:  16px;
  --tas-radius-xl:  24px;

  /* Shadow */
  --tas-shadow-sm:  0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --tas-shadow-md:  0 4px 16px rgba(0,0,0,.10), 0 2px 6px rgba(0,0,0,.06);
  --tas-shadow-lg:  0 24px 48px rgba(36,64,146,.18), 0 8px 24px rgba(0,0,0,.10);
  --tas-shadow-btn: 0 4px 14px rgba(239,62,38,.38);

  /* Motion */
  --tas-ease-out:   cubic-bezier(.16,1,.3,1);
  --tas-ease-in:    cubic-bezier(.4,0,1,1);
  --tas-spring:     cubic-bezier(.34,1.4,.64,1);

  /* Typography */
  --tas-font-display: 'DM Serif Display', Georgia, serif;
  --tas-font-body:    'DM Sans', system-ui, sans-serif;
}

/* ──────────────────────────────────────────────────────────────
   2. TRIGGER BUTTON
   ────────────────────────────────────────────────────────────── */
.tas-btn-wrap {
  display: inline-flex !important;
  align-items: center !important;
}

.tas-trigger-btn {
  display: inline-flex !important;
  align-items: center !important;
  gap: 10px !important;
  padding: 15px 30px !important;
  background: var(--tas-accent) !important;
  color: var(--tas-white) !important;
  font-family: var(--tas-font-body) !important;
  font-size: 15px !important;
  font-weight: 600 !important;
  letter-spacing: .2px !important;
  border: none !important;
  border-radius: 50px !important;
  cursor: pointer !important;
  text-decoration: none !important;
  position: relative !important;
  overflow: hidden !important;
  transition: background .25s ease, transform .2s var(--tas-spring), box-shadow .25s ease !important;
  box-shadow: var(--tas-shadow-btn) !important;
  -webkit-font-smoothing: antialiased !important;
  user-select: none !important;
}

/* Shine sweep on hover */
.tas-trigger-btn::before {
  content: '' !important;
  position: absolute !important;
  inset: 0 !important;
  background: linear-gradient(105deg, transparent 40%, rgba(255,255,255,.25) 55%, transparent 70%) !important;
  transform: translateX(-100%) !important;
  transition: transform .5s ease !important;
}

.tas-trigger-btn:hover {
  background: var(--tas-accent-dark) !important;
  transform: translateY(-2px) !important;
  box-shadow: 0 8px 24px rgba(239,62,38,.45) !important;
}

.tas-trigger-btn:hover::before {
  transform: translateX(100%) !important;
}

.tas-trigger-btn:active {
  transform: translateY(0) !important;
  box-shadow: var(--tas-shadow-btn) !important;
}

.tas-btn-arrow {
  transition: transform .2s var(--tas-spring) !important;
  flex-shrink: 0 !important;
}

.tas-trigger-btn:hover .tas-btn-arrow {
  transform: translateX(3px) !important;
}

/* ──────────────────────────────────────────────────────────────
   3. MODAL OVERLAY
   ────────────────────────────────────────────────────────────── */
.tas-overlay {
  position: fixed !important;
  inset: 0 !important;
  z-index: 1000000 !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  padding: 16px !important;
  background: rgba(15, 23, 42, 0.65) !important;
  backdrop-filter: blur(8px) !important;
  -webkit-backdrop-filter: blur(8px) !important;

  /* Initial state */
  opacity: 0 !important;
  visibility: hidden !important;
  transition: opacity .3s ease, visibility .3s ease !important;
}

.tas-overlay.is-open {
  opacity: 1 !important;
  visibility: visible !important;
}

/* ──────────────────────────────────────────────────────────────
   4. MODAL CONTAINER
   ────────────────────────────────────────────────────────────── */
.tas-modal {
  position: relative !important;
  background: var(--tas-white) !important;
  border-radius: var(--tas-radius-lg) !important;
  box-shadow: var(--tas-shadow-lg) !important;
  width: 100% !important;
  max-width: 640px !important;
  max-height: 90vh !important;
  overflow-y: auto !important;
  font-family: var(--tas-font-body) !important;
  color: var(--tas-text) !important;
  -webkit-font-smoothing: antialiased !important;

  /* Custom scrollbar */
  scrollbar-width: thin !important;
  scrollbar-color: var(--tas-gray-200) transparent !important;

  /* Initial state */
  transform: scale(.94) translateY(20px) !important;
  opacity: 0 !important;
  transition: transform .4s var(--tas-spring), opacity .3s ease !important;
}

.tas-modal::-webkit-scrollbar       { width: 5px !important; }
.tas-modal::-webkit-scrollbar-track { background: transparent !important; }
.tas-modal::-webkit-scrollbar-thumb { background: var(--tas-gray-200) !important; border-radius: 4px !important; }

.tas-overlay.is-open .tas-modal {
  transform: scale(1) translateY(0) !important;
  opacity: 1 !important;
}

/* ── Decorative top bar ── */
.tas-modal-topbar {
  display: flex !important;
  align-items: center !important;
  gap: 0 !important;
  height: 6px !important;
  border-radius: var(--tas-radius-lg) var(--tas-radius-lg) 0 0 !important;
  overflow: hidden !important;
}

.tas-modal-topbar span {
  display: block !important;
  height: 100% !important;
  flex: 1 !important;
}

.tas-modal-topbar span:nth-child(1) { background: var(--tas-primary) !important; flex: 3 !important; }
.tas-modal-topbar span:nth-child(2) { background: var(--tas-accent) !important; flex: 1 !important; }
.tas-modal-topbar span:nth-child(3) { background: var(--tas-primary-dark) !important; flex: .5 !important; }

/* ──────────────────────────────────────────────────────────────
   5. CLOSE BUTTON
   ────────────────────────────────────────────────────────────── */
.tas-close-btn {
  position: absolute !important;
  top: 16px !important;
  right: 16px !important;
  width: 34px !important;
  height: 34px !important;
  border: 1.5px solid var(--tas-gray-200) !important;
  border-radius: 50% !important;
  background: var(--tas-white) !important;
  color: var(--tas-gray-600) !important;
  cursor: pointer !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  transition: all .2s ease !important;
  z-index: 10 !important;
}

.tas-close-btn:hover {
  background: var(--tas-gray-100) !important;
  color: var(--tas-text) !important;
  border-color: var(--tas-gray-400) !important;
  transform: rotate(90deg) !important;
}

/* ──────────────────────────────────────────────────────────────
   6. MODAL HEADER
   ────────────────────────────────────────────────────────────── */
.tas-modal-header {
  display: flex !important;
  align-items: flex-start !important;
  gap: 16px !important;
  padding: 28px 32px 0 !important;
}

.tas-header-icon {
  flex-shrink: 0 !important;
  width: 52px !important;
  height: 52px !important;
  background: var(--tas-primary-light) !important;
  color: var(--tas-primary) !important;
  border-radius: var(--tas-radius) !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
}

.tas-header-text {
  flex: 1 !important;
  min-width: 0 !important;
  padding-top: 2px !important;
}

.tas-header-text h2 {
  font-family: var(--tas-font-display) !important;
  font-size: 24px !important;
  font-weight: 400 !important;
  color: var(--tas-primary) !important;
  margin: 0 0 4px !important;
  line-height: 1.2 !important;
}

.tas-header-text p {
  font-size: 14px !important;
  color: var(--tas-gray-600) !important;
  margin: 0 !important;
  line-height: 1.5 !important;
}

/* ──────────────────────────────────────────────────────────────
   7. ALERT / MESSAGE AREA
   ────────────────────────────────────────────────────────────── */
.tas-alert {
  margin: 16px 32px 0 !important;
  padding: 12px 16px !important;
  border-radius: var(--tas-radius-sm) !important;
  font-size: 14px !important;
  font-weight: 500 !important;
  display: none !important;
  line-height: 1.5 !important;
}

.tas-alert.is-error {
  display: flex !important;
  align-items: flex-start !important;
  gap: 8px !important;
  background: var(--tas-error-bg) !important;
  color: var(--tas-error) !important;
  border: 1px solid #fecaca !important;
}

.tas-alert.is-success {
  display: flex !important;
  align-items: flex-start !important;
  gap: 8px !important;
  background: var(--tas-success-bg) !important;
  color: var(--tas-success) !important;
  border: 1px solid #a7f3d0 !important;
}

/* ──────────────────────────────────────────────────────────────
   8. STEP INDICATOR
   ────────────────────────────────────────────────────────────── */
.tas-steps {
  display: flex !important;
  align-items: center !important;
  padding: 20px 32px 0 !important;
  gap: 0 !important;
}

.tas-step {
  display: flex !important;
  align-items: center !important;
  gap: 8px !important;
  flex-shrink: 0 !important;
}

.tas-step-num {
  width: 28px !important;
  height: 28px !important;
  border-radius: 50% !important;
  border: 2px solid var(--tas-gray-200) !important;
  color: var(--tas-gray-400) !important;
  font-size: 13px !important;
  font-weight: 600 !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  transition: all .3s ease !important;
  background: var(--tas-white) !important;
}

.tas-step-label {
  font-size: 12px !important;
  font-weight: 500 !important;
  color: var(--tas-gray-400) !important;
  transition: color .3s ease !important;
  white-space: nowrap !important;
}

.tas-step--active .tas-step-num {
  border-color: var(--tas-primary) !important;
  background: var(--tas-primary) !important;
  color: var(--tas-white) !important;
}

.tas-step--active .tas-step-label {
  color: var(--tas-primary) !important;
  font-weight: 600 !important;
}

.tas-step--done .tas-step-num {
  border-color: var(--tas-success) !important;
  background: var(--tas-success) !important;
  color: var(--tas-white) !important;
}

.tas-step--done .tas-step-label {
  color: var(--tas-success) !important;
}

.tas-step-divider {
  flex: 1 !important;
  height: 2px !important;
  background: var(--tas-gray-200) !important;
  margin: 0 8px !important;
  border-radius: 2px !important;
  min-width: 16px !important;
  position: relative !important;
  overflow: hidden !important;
}

.tas-step-divider::after {
  content: '' !important;
  position: absolute !important;
  inset: 0 !important;
  background: var(--tas-primary) !important;
  transform: scaleX(0) !important;
  transform-origin: left !important;
  transition: transform .4s ease !important;
}

.tas-step-divider.is-done::after {
  transform: scaleX(1) !important;
}

/* ──────────────────────────────────────────────────────────────
   9. FORM LAYOUT
   ────────────────────────────────────────────────────────────── */
.tas-form {
  padding: 20px 32px 28px !important;
}

.tas-form-step {
  animation: tas-step-in .35s var(--tas-ease-out) both !important;
}

.tas-form-step--hidden {
  display: none !important;
}

@keyframes tas-step-in {
  from { opacity: 0; transform: translateX(12px); }
  to   { opacity: 1; transform: translateX(0); }
}

.tas-form-row {
  display: flex !important;
  flex-direction: column !important;
  gap: 16px !important;
  margin-bottom: 16px !important;
}

.tas-form-row--2col {
  display: grid !important;
  grid-template-columns: 1fr 1fr !important;
  gap: 16px !important;
}

/* ──────────────────────────────────────────────────────────────
   10. FORM FIELDS
   ────────────────────────────────────────────────────────────── */
.tas-field {
  display: flex !important;
  flex-direction: column !important;
  gap: 6px !important;
}

.tas-field label {
  font-size: 13px !important;
  font-weight: 600 !important;
  color: var(--tas-primary) !important;
  display: flex !important;
  align-items: center !important;
  gap: 4px !important;
  letter-spacing: .1px !important;
}

.tas-required {
  color: var(--tas-accent) !important;
  font-size: 15px !important;
  line-height: 1 !important;
}

/* Input wrap */
.tas-input-wrap {
  position: relative !important;
  display: flex !important;
  align-items: center !important;
}

.tas-input-wrap > svg {
  position: absolute !important;
  left: 13px !important;
  color: var(--tas-gray-400) !important;
  pointer-events: none !important;
  flex-shrink: 0 !important;
  top: 50% !important;
  transform: translateY(-50%) !important;
}

.tas-input-wrap--textarea > svg {
  top: 14px !important;
  transform: none !important;
}

.tas-field input,
.tas-field textarea {
  width: 100% !important;
  padding: 11px 14px 11px 40px !important;
  font-family: var(--tas-font-body) !important;
  font-size: 14px !important;
  color: var(--tas-text) !important;
  background: var(--tas-white) !important;
  border: 1.5px solid var(--tas-gray-200) !important;
  border-radius: var(--tas-radius-sm) !important;
  outline: none !important;
  transition: border-color .2s ease, box-shadow .2s ease, background .2s ease !important;
  box-sizing: border-box !important;
  -webkit-appearance: none !important;
  appearance: none !important;
  resize: vertical !important;
}

.tas-field textarea {
  padding-top: 12px !important;
  min-height: 90px !important;
  align-items: flex-start !important;
}

.tas-field input::placeholder,
.tas-field textarea::placeholder {
  color: var(--tas-gray-400) !important;
  font-weight: 400 !important;
}

.tas-field input:hover,
.tas-field textarea:hover {
  border-color: #b0bcd8 !important;
}

.tas-field input:focus,
.tas-field textarea:focus {
  border-color: var(--tas-primary) !important;
  box-shadow: 0 0 0 3px rgba(36,64,146,.12) !important;
  background: var(--tas-white) !important;
}

/* Error state */
.tas-field.has-error input,
.tas-field.has-error textarea {
  border-color: var(--tas-error) !important;
  background: var(--tas-error-bg) !important;
}

.tas-field.has-error input:focus,
.tas-field.has-error textarea:focus {
  box-shadow: 0 0 0 3px rgba(220,38,38,.12) !important;
}

.tas-field-error {
  font-size: 12px !important;
  color: var(--tas-error) !important;
  font-weight: 500 !important;
  min-height: 16px !important;
  display: flex !important;
  align-items: center !important;
  gap: 4px !important;
}

/* ──────────────────────────────────────────────────────────────
   11. FILE UPLOAD ZONE
   ────────────────────────────────────────────────────────────── */
.tas-upload-zone {
  position: relative !important;
  border: 2px dashed var(--tas-gray-200) !important;
  border-radius: var(--tas-radius) !important;
  background: var(--tas-gray-50) !important;
  cursor: pointer !important;
  transition: border-color .2s ease, background .2s ease, transform .2s ease !important;
  overflow: hidden !important;
}

.tas-upload-zone:hover {
  border-color: var(--tas-primary) !important;
  background: var(--tas-primary-subtle) !important;
  transform: translateY(-1px) !important;
}

.tas-upload-zone.is-dragover {
  border-color: var(--tas-accent) !important;
  background: var(--tas-accent-light) !important;
  transform: scale(1.01) !important;
}

.tas-upload-zone.has-file {
  border-style: solid !important;
  border-color: var(--tas-primary) !important;
  background: var(--tas-primary-subtle) !important;
}

.tas-upload-input {
  position: absolute !important;
  inset: 0 !important;
  width: 100% !important;
  height: 100% !important;
  opacity: 0 !important;
  cursor: pointer !important;
  z-index: 2 !important;
}

.tas-upload-ui {
  padding: 20px 16px !important;
  text-align: center !important;
  pointer-events: none !important;
  user-select: none !important;
}

.tas-upload-icon {
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  width: 48px !important;
  height: 48px !important;
  border-radius: 12px !important;
  background: var(--tas-primary-light) !important;
  color: var(--tas-primary) !important;
  margin-bottom: 10px !important;
  transition: background .2s ease, color .2s ease !important;
}

.tas-upload-zone.is-dragover .tas-upload-icon {
  background: var(--tas-accent-light) !important;
  color: var(--tas-accent) !important;
}

.tas-upload-zone.has-file .tas-upload-icon {
  background: var(--tas-primary) !important;
  color: var(--tas-white) !important;
}

.tas-upload-prompt {
  font-size: 13px !important;
  font-weight: 600 !important;
  color: var(--tas-text) !important;
  margin: 0 0 3px !important;
}

.tas-upload-hint {
  font-size: 11px !important;
  color: var(--tas-gray-400) !important;
  margin: 0 !important;
}

.tas-upload-filename {
  font-size: 12px !important;
  font-weight: 600 !important;
  color: var(--tas-primary) !important;
  margin: 6px 0 0 !important;
  min-height: 16px !important;
  overflow: hidden !important;
  text-overflow: ellipsis !important;
  white-space: nowrap !important;
  padding: 0 8px !important;
}

.tas-field.has-error .tas-upload-zone {
  border-color: var(--tas-error) !important;
  background: var(--tas-error-bg) !important;
}

/* ──────────────────────────────────────────────────────────────
   12. PRIVACY NOTE
   ────────────────────────────────────────────────────────────── */
.tas-privacy-note {
  display: flex !important;
  align-items: center !important;
  gap: 8px !important;
  font-size: 12px !important;
  color: var(--tas-gray-400) !important;
  padding: 12px 16px !important;
  background: var(--tas-gray-50) !important;
  border-radius: var(--tas-radius-sm) !important;
  border: 1px solid var(--tas-gray-100) !important;
  margin-top: 4px !important;
}

.tas-privacy-note svg {
  flex-shrink: 0 !important;
  color: var(--tas-primary) !important;
}

/* ──────────────────────────────────────────────────────────────
   13. NAVIGATION BUTTONS
   ────────────────────────────────────────────────────────────── */
.tas-form-nav {
  display: flex !important;
  align-items: center !important;
  justify-content: flex-end !important;
  gap: 10px !important;
  margin-top: 24px !important;
  padding-top: 20px !important;
  border-top: 1px solid var(--tas-gray-100) !important;
}

.tas-btn {
  display: inline-flex !important;
  align-items: center !important;
  gap: 8px !important;
  padding: 12px 24px !important;
  font-family: var(--tas-font-body) !important;
  font-size: 14px !important;
  font-weight: 600 !important;
  border-radius: 50px !important;
  cursor: pointer !important;
  border: none !important;
  transition: all .2s ease !important;
  text-decoration: none !important;
  white-space: nowrap !important;
  -webkit-font-smoothing: antialiased !important;
}

/* Primary — accent red */
.tas-btn--primary {
  background: var(--tas-accent) !important;
  color: var(--tas-white) !important;
  box-shadow: 0 4px 12px rgba(239,62,38,.3) !important;
}

.tas-btn--primary:hover:not(:disabled) {
  background: var(--tas-accent-dark) !important;
  transform: translateY(-1px) !important;
  box-shadow: 0 6px 18px rgba(239,62,38,.4) !important;
}

.tas-btn--primary:active {
  transform: translateY(0) !important;
}

.tas-btn--primary:disabled {
  opacity: .65 !important;
  cursor: not-allowed !important;
}

/* Ghost — outline */
.tas-btn--ghost {
  background: transparent !important;
  color: var(--tas-gray-600) !important;
  border: 1.5px solid var(--tas-gray-200) !important;
}

.tas-btn--ghost:hover {
  background: var(--tas-gray-50) !important;
  border-color: var(--tas-gray-400) !important;
  color: var(--tas-text) !important;
}

.tas-btn--outline {
  background: var(--tas-white) !important;
  color: var(--tas-primary) !important;
  border: 1.5px solid var(--tas-primary) !important;
}

.tas-btn--outline:hover {
  background: var(--tas-primary-subtle) !important;
}

/* Loading state */
.tas-spinner {
  display: none !important;
}

.tas-spinner svg {
  animation: tas-spin .9s linear infinite !important;
}

.tas-btn.is-loading .tas-btn-label {
  display: none !important;
}

.tas-btn.is-loading .tas-spinner {
  display: flex !important;
}

@keyframes tas-spin {
  to { transform: rotate(360deg); }
}

/* ──────────────────────────────────────────────────────────────
   14. SUCCESS STATE
   ────────────────────────────────────────────────────────────── */
.tas-success {
  padding: 48px 32px 40px !important;
  text-align: center !important;
  animation: tas-success-in .5s var(--tas-spring) both !important;
}

@keyframes tas-success-in {
  from { opacity: 0; transform: scale(.9); }
  to   { opacity: 1; transform: scale(1); }
}

.tas-success-icon {
  width: 80px !important;
  height: 80px !important;
  border-radius: 50% !important;
  background: linear-gradient(135deg, var(--tas-primary), var(--tas-primary-dark)) !important;
  color: var(--tas-white) !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  margin: 0 auto 24px !important;
  box-shadow: 0 8px 24px rgba(36,64,146,.3) !important;
  animation: tas-icon-bounce .6s var(--tas-spring) .1s both !important;
}

@keyframes tas-icon-bounce {
  from { transform: scale(0) rotate(-10deg); }
  to   { transform: scale(1) rotate(0deg); }
}

.tas-success h3 {
  font-family: var(--tas-font-display) !important;
  font-size: 26px !important;
  font-weight: 400 !important;
  color: var(--tas-primary) !important;
  margin: 0 0 12px !important;
}

.tas-success p {
  font-size: 15px !important;
  color: var(--tas-gray-600) !important;
  line-height: 1.65 !important;
  max-width: 380px !important;
  margin: 0 auto 28px !important;
}

/* ──────────────────────────────────────────────────────────────
   15. RESPONSIVE — MOBILE SHEET
   ────────────────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .tas-overlay {
    align-items: flex-end !important;
    padding: 0 !important;
  }

  .tas-modal {
    border-radius: var(--tas-radius-lg) var(--tas-radius-lg) 0 0 !important;
    max-height: 94vh !important;
    transform: translateY(100%) !important;
  }

  .tas-overlay.is-open .tas-modal {
    transform: translateY(0) !important;
  }

  .tas-modal-header {
    padding: 24px 20px 0 !important;
  }

  .tas-form {
    padding: 16px 20px 24px !important;
  }

  .tas-alert {
    margin: 14px 20px 0 !important;
  }

  .tas-steps {
    padding: 16px 20px 0 !important;
  }

  .tas-step-label {
    display: none !important;
  }

  .tas-form-row--2col {
    grid-template-columns: 1fr !important;
  }

  .tas-form-nav {
    flex-wrap: wrap !important;
  }

  .tas-btn {
    flex: 1 !important;
    justify-content: center !important;
  }

  .tas-success {
    padding: 36px 20px 32px !important;
  }
}