/* =========================================================
   Smart Assess — Full Theme CSS (v2)
   - Single, consistent brand palette (cool purple + teal accent)
   - Clear button hierarchy + states
   - Unified typography (Montserrat)
   - Strong focus states (a11y)
   - Smoother spacing & layout rhythm
   - Responsive polish
   ========================================================= */

/* Fonts */
@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@400;500;600;700&display=swap');

/* =========================
   THEME TOKENS
   ========================= */
:root {
  /* Brand */
  --primary: #6246ea;            /* main purple */
  --primary-600: #523bde;        /* hover */
  --primary-700: #4026c4;        /* active */
  --primary-100: #f3f0ff;        /* subtle bg tint */
  --accent: #14b8a6;             /* teal accent for focus/CTA highlights */
  --accent-100: rgba(20,184,166,0.12);

  /* Neutrals */
  --bg-dark: #0e0e1e;            /* hero/backdrop */
  --bg-page: #000000;
  --bg-card: #ffffff;
  --bg-soft: #f8f8ff;
  --border: #e5e7eb;
  --border-soft: #eceefe;
  --shadow: 0 6px 24px rgba(36,37,83,0.10);
  --shadow-sm: 0 2px 10px rgba(0,0,0,0.06);
  --shadow-focus: 0 0 0 4px rgba(98,70,234,0.18);

  /* Text */
  --text-main: #1a1a2e;
  --text-muted: #6b7280;
  --text-inverse: #ffffff;
  --text-hero: #e0e7ff;

  /* Radii */
  --r-xs: 6px;
  --r-sm: 8px;
  --r-md: 10px;
  --r-lg: 12px;
  --r-xl: 16px;
  --r-2xl: 24px;
  --r-pill: 999px;

  /* Sizing & rhythm */
  --container-w: 75%;
  --navbar-h: 60px;
  --space-1: 6px;
  --space-2: 10px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-7: 28px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;

  /* Transitions */
  --t-fast: 150ms ease;
  --t-base: 220ms ease;
  --t-slow: 320ms ease;
}

/* =========================
   RESET / BASE
   ========================= */
* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background-color: var(--bg-page);
  background-image: url('page-illustration.svg');
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center top;
  background-attachment: fixed;
  color: var(--text-hero);
  font-family: 'Montserrat', system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Utility */
.container { width: var(--container-w); margin: 0 auto; }

/* =========================
   NAVBAR
   ========================= */
.navbar-wrapper {
  display: flex;
  justify-content: center;
  width: 100%;
  padding-top: var(--space-5);
}

.navbar {
  position: sticky;
  top: 0;
  width: var(--container-w);
  height: var(--navbar-h);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 0 var(--space-6);
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  z-index: 20;
  backdrop-filter: saturate(140%) blur(6px);
}

.navbar-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
}

.logo-img {
  height: 70px;
  width: auto;
  object-fit: contain;
  display: block;
}

.nav-actions { display: flex; gap: 14px; }

/* =========================
   BUTTONS (SYSTEM)
   ========================= */
button, .button {
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color var(--t-base), color var(--t-base),
              box-shadow var(--t-base), transform var(--t-fast), border-color var(--t-base);
  padding: 10px 18px;
  border-radius: var(--r-sm);
  line-height: 1.2;
}

/* Variants */
.btn-primary {
  background: var(--primary);
  color: var(--text-inverse);
  box-shadow: 0 2px 6px rgba(98,70,234,0.25);
}
.btn-primary:hover { background: var(--primary-600); box-shadow: var(--shadow-focus); transform: translateY(-1px); }
.btn-primary:active { background: var(--primary-700); transform: translateY(0); }

.btn-secondary {
  background: #f7f7fb;
  color: var(--text-main);
  border-color: var(--border);
}
.btn-secondary:hover { background: #f0efff; border-color: var(--primary); color: var(--primary); }

.btn-ghost {
  background: transparent;
  color: var(--primary);
  border-color: var(--primary);
}
.btn-ghost:hover { background: var(--primary-100); color: var(--primary-700); }

button:disabled,
.button[aria-disabled="true"] {
  opacity: 0.6; cursor: not-allowed; box-shadow: none; transform: none;
}

/* Compact navbar actions */
.nav-actions .btn-secondary,
.nav-actions .btn-primary {
  padding: 6px 12px !important;
  font-size: 13px !important;
  height: auto !important;
  border-radius: var(--r-xs);
}

/* Greeting chip */
.nav-actions .greeting-text {
  padding: 6px 12px;
  font-size: 13px;
  color: var(--primary);
  background: var(--primary-100);
  font-weight: 600;
  border-radius: var(--r-xs);
}

/* Focus (a11y) */
button:focus-visible, .button:focus-visible, a.switch-link:focus-visible {
  outline: 0; box-shadow: var(--shadow-focus), 0 0 0 1px var(--primary);
  border-color: var(--primary);
}

/* =========================
   HERO
   ========================= */
.hero-container {
  position: relative;
  height: 30vh;
  min-height: 240px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  margin-top: 6px;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 760px;
  padding: 0 20px;
}

.hero-title {
  font-size: clamp(2.2rem, 4vw, 3.6rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
  color: var(--text-hero);
}

.hero-subtitle {
  font-size: clamp(1rem, 1.6vw, 1.15rem);
  font-weight: 400;
  color: rgba(224,231,255,0.9);
  margin-bottom: 28px;
}

/* =========================
   SWITCH LINKS (PILLS)
   ========================= */
.switch-links {
  position: relative;
  width: var(--container-w);
  margin: 0 auto;
  height: 0; /* visually sits over hero */
}

.switch-links .switch-link {
  position: absolute;
  top: -46px;
  font-size: 13px;
  padding: 6px 16px;
  border: 1px solid var(--primary);
  border-radius: var(--r-pill);
  font-weight: 600;
  text-decoration: none;
  transition: all var(--t-fast);
  background: var(--bg-card);
  color: var(--primary);
  box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

.switch-links .switch-link:first-child { right: 270px; }
.switch-links .switch-link:last-child  { right: 0; }

.switch-links .switch-link:hover {
  background: var(--primary-100);
  color: var(--primary-700);
  border-color: var(--primary-600);
}

/* =========================
   MAIN FORM / CARDS
   ========================= */
.grading-form {
  display: flex;
  justify-content: center;
  padding: 40px 0 80px;
}

.form-container {
  width: var(--container-w);
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
  color: var(--text-main);
  background: linear-gradient(135deg, #ffffff 0%, var(--bg-soft) 60%, #f0eeff 100%);
  border: 1px solid var(--border-soft);
  border-radius: var(--r-2xl);
  box-shadow: var(--shadow);
  padding: 48px 60px;
  min-height: 640px;
  backdrop-filter: blur(4px);
}

/* Column blocks */
.submission, .grading-options {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.submission {
  background: var(--bg-card);
  padding: 28px;
  border-radius: var(--r-xl);
  box-shadow: 0 2px 20px rgba(0,0,0,0.04);
  border: 1px solid var(--border);
  max-width: 720px;
  margin: 0 auto;
}

.form-label,
.grade-levels span,
.grading-intensity span {
  display: block;
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text-main);
}

/* Textarea / Inputs */
textarea, input, select {
  font-family: inherit;
  font-size: 1rem;
  line-height: 1.5;
  color: var(--text-main);
}

textarea {
  width: 100%;
  min-height: 485px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  padding: 16px 14px;
  resize: vertical;
}

textarea::placeholder { color: #9aa1af; }

textarea:focus-visible, select:focus-visible, input:focus-visible {
  outline: 0;
  border-color: var(--primary);
  box-shadow: var(--shadow-focus);
}

/* Submission buttons row */
.submission-buttons {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.btn-outline-orange, /* legacy class -> mapped to brand primary */
.btn-purple { background: var(--primary); color: var(--text-inverse); border-color: transparent; }
.btn-outline-orange:hover, .btn-purple:hover { background: var(--primary-600); box-shadow: var(--shadow-focus); }

/* Grading card (right column) */
.grading-card {
  background: var(--bg-card);
  border-radius: var(--r-xl);
  padding: 24px 28px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  height: 400px;
}

.grading-card > div { margin-bottom: 28px; }

/* Grade buttons */
.grade-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 10px;
}

.btn-toggle {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-main);
  padding: 8px 18px;
  border-radius: var(--r-sm);
  font-size: 0.95rem;
  font-weight: 600;
  transition: all var(--t-fast);
}
.btn-toggle:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-100); }
.btn-toggle.selected {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--text-inverse);
  box-shadow: var(--shadow-focus);
}

select {
  width: 100%;
  padding: 12px;
  border-radius: var(--r-lg);
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-main);
}

/* Grade action (submit) */
.grade-action {
  width: 100%;
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}
.grade-btn {
  width: 100%;
  font-size: 1rem;
  font-weight: 600;
  padding: 16px 0;
  background: var(--primary);
  color: var(--text-inverse);
  border: 1px solid var(--primary);
  border-radius: var(--r-lg);
  box-shadow: 0 2px 6px rgba(98,70,234,0.25);
  transition: all var(--t-base);
}
.grade-btn:hover { background: var(--primary-600); box-shadow: var(--shadow-focus); transform: translateY(-1px); }
.grade-btn:active { background: var(--primary-700); transform: translateY(0); }

/* PDF link */
#pdf-link { margin-top: 16px; display: block; color: var(--primary); }
#pdf-link a { display: inline-block; margin-top: 10px; font-weight: 600; color: var(--primary); text-decoration: none; }
#pdf-link a:hover { text-decoration: underline; }

/* Loader */
.loader {
  border: 6px solid #f3f3f3;
  border-top: 6px solid var(--primary);
  border-radius: 50%;
  width: 36px; height: 36px;
  animation: spin 1s linear infinite;
  margin: 20px auto 0;
}

/* =========================
   HANDWRITTEN TOGGLE
   ========================= */
.toggle-handwritten {
  display: flex; align-items: center; gap: 6px;
  margin-left: 16px; font-size: 14px; font-weight: 600;
  color: #1f2937; cursor: pointer; user-select: none;
}

.toggle-handwritten input[type="checkbox"] {
  appearance: none; width: 18px; height: 18px;
  border: 2px solid #cbd5e1; border-radius: 4px;
  position: relative; cursor: pointer; transition: all var(--t-fast);
}
.toggle-handwritten input[type="checkbox"]:checked {
  background: var(--primary); border-color: var(--primary);
}
.toggle-handwritten input[type="checkbox"]::after {
  content: ''; position: absolute; top: 3px; left: 6px;
  width: 4px; height: 8px; border: solid #fff; border-width: 0 2px 2px 0;
  opacity: 0; transform: rotate(45deg); transition: all var(--t-fast);
}
.toggle-handwritten input[type="checkbox"]:checked::after { opacity: 1; }

/* Smooth fades for toggling views */
.grading-options, #submission-textarea { transition: opacity var(--t-base); }

/* =========================
   BATCH GRID
   ========================= */
.batch-grid {
  display: flex; flex-direction: column; gap: 6px;
  margin-top: 20px;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  overflow: hidden; width: 100%;
}

.batch-header, .batch-row {
  display: grid;
  grid-template-columns:
    50px     /* Preview */
    1fr      /* File Name */
    120px    /* Grade Level */
    120px    /* Intensity */
    120px;   /* Action */
  align-items: center;
  padding: 8px 12px;
  gap: 12px; text-align: left; box-sizing: border-box;
}

.batch-header {
  background: #f9fafb;
  font-weight: 700;
  font-size: 12px; color: #374151;
  border-bottom: 1px solid var(--border);
}

.batch-row {
  background: #fff;
  font-size: 13px;
  height: 56px;
  border-bottom: 1px solid #f1f1f1;
  transition: background var(--t-fast);
}
.batch-row:hover { background: #f9f9ff; }

.preview-cell img {
  width: 50px; height: 38px; object-fit: cover;
  border-radius: 4px; border: 1px solid #ddd;
}

.file-name {
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}

.batch-row select, .batch-row button {
  height: 30px; font-size: 12px; border-radius: 6px; border: 1px solid #d1d5db;
}
.batch-row select { padding: 2px 6px; background: #fff; }
.batch-row button {
  padding: 0 10px; background: var(--primary); color: #fff;
  font-weight: 600; border: 1px solid var(--primary);
  cursor: pointer; transition: background var(--t-fast), box-shadow var(--t-fast), transform var(--t-fast);
}
.batch-row button:hover { background: var(--primary-600); box-shadow: var(--shadow-focus); transform: translateY(-1px); }

/* Add-row footer */
.add-row {
  text-align: center; padding: 12px; background: #f3f4f6;
  cursor: pointer; color: #4b5563; font-weight: 600; font-size: 13px;
}
.add-row:hover { background: #e5e7eb; }

/* Scroll area for grid section */
#batch-grid-section {
  flex: 1.2; min-width: 550px; margin-top: 0; overflow-x: auto;
  scrollbar-width: thin; scrollbar-color: #c5c6ca var(--bg-soft);
}
#batch-grid-section::-webkit-scrollbar { height: 6px; }
#batch-grid-section::-webkit-scrollbar-thumb { background: #c5c6ca; border-radius: 4px; }
#batch-grid-section::-webkit-scrollbar-track { background: var(--bg-soft); }

/* Column proportions in main layout */
.grading-form .form-container {
  display: flex; flex-direction: row; align-items: flex-start; justify-content: space-between; gap: 40px;
}
.submission { flex: 0.8; min-width: 340px; }
#batch-grid-section h2, #batch-grid-section p { margin-left: 0; }
.submission, #batch-grid-section { align-self: stretch; }

/* =========================
   ICON & MISC CONTROLS
   ========================= */
.loading-spinner {
  display: inline-block; width: 16px; height: 16px;
  border: 2px solid rgba(255,255,255,0.4);
  border-top-color: #ffffff; border-radius: 50%;
  animation: spin 0.7s linear infinite; vertical-align: middle;
}

.delete-btn {
  background: none; border: none; cursor: pointer; padding: 4px;
  color: #6b7280; transition: color var(--t-fast), transform var(--t-fast);
}
.delete-btn:hover { color: #ef4444; transform: scale(1.12); }

.download-btn {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--primary-100);
  border: 1px solid #d1c4ff;
  border-radius: var(--r-xs);
  color: var(--primary);
  font-weight: 600; font-size: 13px; padding: 6px 10px;
  text-decoration: none; transition: all var(--t-fast);
}
.download-btn:hover {
  background: var(--primary); color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(98,70,234,0.25);
}

/* =========================
   KEYFRAMES
   ========================= */
@keyframes spin { to { transform: rotate(360deg); } }

/* =========================
   RESPONSIVE
   ========================= */
@media (max-width: 1200px) { :root { --container-w: 85%; } }
@media (max-width: 900px) {
  .grading-form .form-container { flex-direction: column; gap: 30px; padding: 32px 24px; }
  .navbar, .switch-links, .container { width: 92%; }
  .switch-links .switch-link:first-child { right: 180px; }
}
@media (max-width: 640px) {
  .navbar { padding: 0 14px; }
  .logo-img { height: 56px; }
  .switch-links { display: none; } /* simplify on small screens */
  .hero-container { min-height: 200px; }
  .form-container { padding: 24px 16px; border-radius: 16px; }
  .batch-header, .batch-row { grid-template-columns: 40px 1fr 110px 110px 100px; }
}

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