/* ===== ScienceForge Dark Theme ===== */

:root {
  --sf-bg: #0a0e17;
  --sf-surface: #141925;
  --sf-card: rgba(20, 25, 40, 0.8);
  --sf-primary: #4f8cff;
  --sf-accent: #00d4aa;
  --sf-text: #e8eaf0;
  --sf-danger: #ff6b6b;
  --sf-warning: #ffd93d;
}

/* ===== Base ===== */

html {
  font-size: 14px;
  position: relative;
  min-height: 100%;
}

@media (min-width: 768px) {
  html {
    font-size: 16px;
  }
}

body {
  background-color: var(--sf-bg);
  color: var(--sf-text);
  padding-top: 70px;
  margin: 0;
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--sf-primary);
}

a:hover {
  color: var(--sf-accent);
}

/* ===== Navbar ===== */

.sf-navbar {
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background: rgba(10, 14, 23, 0.85);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  padding: 0.5rem 1rem;
}

.sf-navbar .navbar-brand {
  font-weight: 700;
  color: var(--sf-text);
}

.sf-navbar .nav-link {
  color: rgba(232, 234, 240, 0.7);
  transition: color 0.2s;
}

.sf-navbar .nav-link:hover,
.sf-navbar .nav-link.active {
  color: var(--sf-primary);
}

.brand-icon {
  font-size: 1.5rem;
}

/* ===== Main Content ===== */

.main-content {
  min-height: calc(100vh - 120px);
}

/* ===== Footer ===== */

.sf-footer {
  background-color: #060a14;
  padding: 3rem 0;
  border-top: 1px solid rgba(148, 163, 184, 0.12);
  color: #8892a4;
  font-size: 0.875rem;
}
.sf-footer a { color: #b0b8c8; }
.sf-footer a:hover { color: #3b82f6; }

@media (max-width: 768px) {
  .sf-footer { padding: 2rem 0; text-align: center; }
}

/* ===== Glass Cards ===== */

.glass-card {
  background: var(--sf-card);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 16px;
  padding: 2rem;
}

/* ===== Hero Section ===== */

.hero-section {
  min-height: 80vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.hero-section .hero-content {
  position: relative;
  z-index: 1;
}

.hero-emoji {
  font-size: 5rem;
  line-height: 1;
  margin-bottom: 1rem;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--sf-primary), var(--sf-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.15;
}

.hero-subtitle {
  font-size: 1.3rem;
  color: rgba(255, 255, 255, 0.7);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.6;
}

/* ===== Module Cards ===== */

.module-card {
  background: var(--sf-card);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 16px;
  padding: 2rem;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  cursor: pointer;
}

.module-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

.module-card.study {
  border-top: 3px solid #4f8cff;
}

.module-card.solve {
  border-top: 3px solid #ff6b6b;
}

.module-card.talk {
  border-top: 3px solid #ffd93d;
}

.module-card.forge {
  border-top: 3px solid #00d4aa;
}

.module-card .module-icon {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.module-card .module-title {
  font-weight: 700;
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

/* ===== Chat Bubbles ===== */

.chat-bubble {
  border-radius: 18px;
  padding: 1rem 1.25rem;
  max-width: 80%;
  margin-bottom: 0.75rem;
  line-height: 1.5;
}

.chat-bubble.user {
  background: var(--sf-primary);
  color: #fff;
  margin-left: auto;
  border-bottom-right-radius: 4px;
}

.chat-bubble.assistant {
  background: var(--sf-surface);
  color: var(--sf-text);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-bottom-left-radius: 4px;
}

/* ===== Quiz Options ===== */

.quiz-option {
  cursor: pointer;
  border: 2px solid transparent;
  border-radius: 12px;
  padding: 1rem;
  background: var(--sf-surface);
  color: var(--sf-text);
  transition: border-color 0.2s ease, background 0.2s ease;
}

.quiz-option:hover {
  border-color: var(--sf-primary);
}

.quiz-option.correct {
  border-color: #00d4aa;
  background: rgba(0, 212, 170, 0.1);
}

.quiz-option.incorrect {
  border-color: #ff6b6b;
  background: rgba(255, 107, 107, 0.1);
}

/* ===== Flashcard ===== */

.flashcard-container {
  perspective: 1000px;
}

.flashcard {
  width: 100%;
  min-height: 250px;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.6s ease;
  cursor: pointer;
}

.flashcard.flipped {
  transform: rotateY(180deg);
}

.flashcard-front,
.flashcard-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  background: var(--sf-card);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.flashcard-front {
  color: var(--sf-text);
  font-size: 1.25rem;
  font-weight: 600;
}

.flashcard-back {
  transform: rotateY(180deg);
  color: var(--sf-accent);
  font-size: 1.1rem;
}

/* ===== Concept Map ===== */

#concept-map {
  width: 100%;
  height: 500px;
  border-radius: 16px;
  background: var(--sf-surface);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

/* ===== Formula Cards ===== */

.formula-card {
  background: #1a1f35;
  border: 1px solid #2a2f45;
  border-radius: 12px;
  padding: 1.5rem;
  transition: all 0.3s ease;
}
.formula-card:hover {
  border-color: var(--sf-physics, #3b82f6);
  box-shadow: 0 4px 20px rgba(59,130,246,.12);
}
.formula-card .card-title {
  color: #ffffff;
}
.formula-expression {
  background: rgba(59,130,246,.1);
  border-radius: .5rem;
  padding: 1rem;
  font-size: 1.3rem;
  text-align: center;
  font-family: 'Cambria Math', 'Latin Modern Math', serif;
  color: #ffffff;
  min-height: 48px;
  display: flex; align-items: center; justify-content: center;
  border: 1px solid rgba(59,130,246,.2);
}
.formula-vars-table {
  width: 100%; font-size: .85rem;
}
.formula-vars-table th {
  color: #b0b8c8; font-weight: 600;
  border-bottom: 1px solid #2a2f45;
  padding: .35rem .5rem;
}
.formula-vars-table td {
  padding: .35rem .5rem;
  border-bottom: 1px solid rgba(42,47,69,.5);
  color: #e0e0e0;
}

/* ===== Upload Zone ===== */

.upload-zone {
  border: 2px dashed #2a2f45;
  border-radius: 16px;
  padding: 3rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.3s ease, background 0.3s ease;
  color: #8892a4;
  background: rgba(26, 31, 53, 0.4);
}

.upload-zone:hover {
  border-color: var(--sf-primary);
  color: #b0b8c8;
}

.upload-zone.dragover {
  border-color: var(--sf-accent);
  background: rgba(0, 212, 170, 0.05);
}

/* ===== Camera Zone ===== */

.camera-zone {
  border: 2px dashed #2a2f45;
  border-radius: 16px;
  padding: 3rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.3s ease, background 0.3s ease;
  color: #8892a4;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}

.camera-zone:hover {
  border-color: var(--sf-primary);
}

.camera-zone .camera-icon {
  font-size: 3rem;
  color: #8892a4;
}

/* ===== Processing Stepper ===== */

.stepper .step {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem;
  border-radius: 8px;
  color: #8892a4;
  transition: color 0.3s ease;
}

.stepper .step.active {
  color: var(--sf-primary);
}

.stepper .step.done {
  color: var(--sf-accent);
}

.stepper .step.error {
  color: #ff6b6b;
}

/* ===== Document Cards ===== */

.doc-card {
  background: var(--sf-card);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 16px;
  padding: 2rem;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.doc-status-badge {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
}

.doc-status-badge.processing {
  background: rgba(79, 140, 255, 0.15);
  color: var(--sf-primary);
}

.doc-status-badge.ready {
  background: rgba(0, 212, 170, 0.15);
  color: var(--sf-accent);
}

.doc-status-badge.error {
  background: rgba(255, 107, 107, 0.15);
  color: #ff6b6b;
}

/* ===== Mic Button ===== */

.mic-btn {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  border: none;
  background: var(--sf-primary);
  color: #fff;
  font-size: 2rem;
  transition: background 0.3s ease, box-shadow 0.3s ease;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.mic-btn:hover {
  box-shadow: 0 0 20px rgba(79, 140, 255, 0.4);
}

.mic-btn.recording {
  background: #ff6b6b;
  animation: pulse 1.5s infinite;
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(255, 107, 107, 0.4);
  }
  70% {
    box-shadow: 0 0 0 20px rgba(255, 107, 107, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(255, 107, 107, 0);
  }
}

/* ===== Solution Steps ===== */

.solution-step {
  position: relative;
  padding-left: 2rem;
  border-left: 2px solid var(--sf-primary);
  margin-bottom: 1.5rem;
}

.solution-step .step-number {
  position: absolute;
  left: -12px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--sf-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
}

/* ===== Waveform ===== */

.waveform-container {
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 3px;
}

.waveform-bar {
  width: 4px;
  background: var(--sf-primary);
  border-radius: 2px;
  animation: waveform 1s infinite ease-in-out;
}

.waveform-bar:nth-child(1) { animation-delay: 0s; }
.waveform-bar:nth-child(2) { animation-delay: 0.1s; }
.waveform-bar:nth-child(3) { animation-delay: 0.2s; }
.waveform-bar:nth-child(4) { animation-delay: 0.3s; }
.waveform-bar:nth-child(5) { animation-delay: 0.4s; }
.waveform-bar:nth-child(6) { animation-delay: 0.5s; }
.waveform-bar:nth-child(7) { animation-delay: 0.6s; }
.waveform-bar:nth-child(8) { animation-delay: 0.7s; }

@keyframes waveform {
  0%, 100% {
    height: 10px;
  }
  50% {
    height: 40px;
  }
}

/* ===== Stats ===== */

.stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--sf-primary), var(--sf-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ===== Study Plan ===== */

.week-card {
  background: var(--sf-card);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 16px;
  padding: 2rem;
  border-left: 4px solid var(--sf-primary);
}

.task-item {
  padding: 0.75rem 1rem;
  border-radius: 8px;
  background: var(--sf-surface);
  margin-bottom: 0.5rem;
}

/* ===== Canvas Container ===== */

.canvas-container {
  position: absolute;
  inset: 0;
  z-index: 0;
}

/* ===== Dropdown Menus (Dark) ===== */

.dropdown-menu {
  background: #1a1f35;
  border: 1px solid #2a2f45;
  border-radius: 12px;
  padding: 0.5rem;
}

.dropdown-item {
  color: #b0b8c8;
  border-radius: 8px;
  padding: 0.5rem 1rem;
}

.dropdown-item:hover,
.dropdown-item:focus {
  background: rgba(68, 138, 255, 0.1);
  color: #ffffff;
}

/* ===== Form Controls (Dark) ===== */

.form-control,
.form-select {
  background: #1a1f35;
  border: 1px solid #2a2f45;
  color: #e0e0e0;
  border-radius: 12px;
}

.form-control:focus,
.form-select:focus {
  background: #1a1f35;
  border-color: #448aff;
  color: #e0e0e0;
  box-shadow: 0 0 0 0.2rem rgba(68, 138, 255, 0.25);
}

.form-control::placeholder {
  color: #5a6178;
}

/* ===== Buttons ===== */

.btn-primary {
  background: var(--sf-primary);
  border-color: var(--sf-primary);
  border-radius: 12px;
}

.btn-primary:hover {
  background: #3a7aef;
  border-color: #3a7aef;
}

.btn-outline-light {
  border-radius: 12px;
}

/* ===== Scrollbar ===== */

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--sf-bg);
}

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.25);
}

/* ===== Contrast & Readability Fixes ===== */

/* Headings always visible */
h1, h2, h3, h4, h5, h6 {
  color: #e0e0e0;
}

/* Body text readable */
body {
  color: #e0e0e0;
}

/* Links high contrast */
a { color: #00e5ff; }
a:hover { color: #66eeff; }

/* Form labels visible */
.form-label, label {
  color: #b0b8c8;
}

/* text-secondary should be readable */
.text-secondary {
  color: #8892a4 !important;
}

/* text-muted override for better contrast */
.text-muted {
  color: #8892a4 !important;
}

/* Card text */
.card {
  background-color: #1a1f35;
  border-color: #2a2f45;
  color: #e0e0e0;
}
.card-header {
  background-color: rgba(26, 31, 53, 0.9);
  border-bottom-color: #2a2f45;
  color: #e0e0e0;
}
.card-footer {
  background-color: rgba(26, 31, 53, 0.9);
  border-top-color: #2a2f45;
}
.card h4, .card h5, .card h6, .card .card-title {
  color: #ffffff;
}
.card strong {
  color: #ffffff;
}

/* Form controls on dark */
.form-control, .form-select {
  background-color: #1a1f35;
  border-color: #2a2f45;
  color: #e0e0e0;
}
.form-control::placeholder {
  color: #5a6178;
}
.form-control:focus, .form-select:focus {
  background-color: #1a1f35;
  border-color: #448aff;
  color: #e0e0e0;
  box-shadow: 0 0 0 0.2rem rgba(68, 138, 255, 0.25);
}

/* Input group addons */
.input-group-text {
  background-color: #141925;
  border-color: #2a2f45;
  color: #8892a4;
}

/* Badges readable */
.badge {
  font-weight: 600;
}

/* Intro text on pages */
.page-intro {
  color: #8892a4;
  font-size: 1.05rem;
  margin-bottom: 1.5rem;
}

/* Nav dropdowns */
.dropdown-menu {
  background: #1a1f35;
  border: 1px solid #2a2f45;
}
.dropdown-item {
  color: #b0b8c8;
}
.dropdown-item:hover, .dropdown-item:focus {
  color: #ffffff;
  background: rgba(68, 138, 255, 0.1);
}

/* Tab nav */
.nav-tabs {
  border-bottom-color: #2a2f45;
}
.nav-tabs .nav-link {
  color: #8892a4;
}
.nav-tabs .nav-link:hover {
  color: #e0e0e0;
  border-color: #2a2f45 #2a2f45 transparent;
}
.nav-tabs .nav-link.active {
  color: #ffffff;
  background-color: #1a1f35;
  border-color: #2a2f45 #2a2f45 #1a1f35;
}

/* Quiz options & list-group-items readable */
.quiz-option, .list-group-item {
  background: #1a1f35;
  border-color: #2a2f45;
  color: #e0e0e0;
}
.quiz-option:hover, .list-group-item:hover {
  background: rgba(68, 138, 255, 0.1);
  border-color: #448aff;
}
.list-group-item .form-check-label {
  color: #e0e0e0;
}

/* Chat bubbles */
.bg-dark {
  background-color: #1a1f35 !important;
}

/* Table dark theme */
.table {
  color: #e0e0e0;
  --bs-table-bg: transparent;
  --bs-table-border-color: #2a2f45;
}
.table th {
  color: #b0b8c8;
  border-bottom-color: #2a2f45;
}
.table td {
  border-bottom-color: rgba(42, 47, 69, 0.5);
}
.table code {
  color: #00e5ff;
}

/* Alert overrides for dark theme */
.alert-info {
  background-color: rgba(79, 140, 255, 0.1);
  border-color: rgba(79, 140, 255, 0.3);
  color: #e0e0e0;
}
.alert-success {
  background-color: rgba(0, 212, 170, 0.1);
  border-color: rgba(0, 212, 170, 0.3);
  color: #e0e0e0;
}

/* Stepper step text visible */
.stepper-step {
  color: #8892a4;
  padding: 0.5rem 0;
}

/* Form check inputs */
.form-check-input {
  background-color: #1a1f35;
  border-color: #2a2f45;
}
.form-check-input:checked {
  background-color: var(--sf-primary);
  border-color: var(--sf-primary);
}

/* Form range */
.form-range::-webkit-slider-runnable-track {
  background: #2a2f45;
}

/* bg-light override for dark theme (formula expressions etc.) */
.bg-light {
  background-color: rgba(20, 25, 40, 0.8) !important;
  color: #e0e0e0;
}

/* ===== Responsive ===== */

@media (max-width: 768px) {
  .hero-title {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .hero-section {
    min-height: 60vh;
  }

  .module-card {
    margin-bottom: 1rem;
  }

  .glass-card {
    padding: 1.25rem;
  }

  .stat-number {
    font-size: 1.75rem;
  }

  .mic-btn {
    width: 64px;
    height: 64px;
    font-size: 1.5rem;
  }

  #concept-map {
    height: 300px;
  }
}

/* ===== Notes Tools — Shared Input Area ===== */

.notes-input-area {
  background: #131829;
  border: 1px solid #2a2f45;
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

/* ===== Notes Tools — Output Tabs ===== */

.output-tabs .nav-link {
  color: #8892a4;
  border: 1px solid transparent;
  border-radius: 8px 8px 0 0;
  padding: 0.6rem 1.2rem;
  font-weight: 500;
  transition: color 0.2s, background 0.2s;
}
.output-tabs .nav-link:hover {
  color: #e0e0e0;
}
.output-tabs .nav-link.active {
  color: #fff;
  background: #1a1f35;
  border-color: #2a2f45 #2a2f45 #1a1f35;
}

/* ===== Smart Summary ===== */

.summary-result {
  background: #1a1f35;
  border: 1px solid #2a2f45;
  border-radius: 12px;
  padding: 1.5rem;
}
.summary-text {
  color: #e0e0e0;
  line-height: 1.8;
  font-size: 1.05rem;
}
.key-points li {
  color: #e0e0e0;
  margin-bottom: 0.5rem;
}
.key-points li::marker {
  color: #10b981;
}
.key-terms .badge {
  background: #1e293b;
  color: #00e5ff;
  border: 1px solid #2a2f45;
  margin: 0.25rem;
  padding: 0.4rem 0.8rem;
  font-size: 0.85rem;
}

/* ===== Quick Quiz ===== */

.quiz-score-bar {
  background: #131829;
  border: 1px solid #2a2f45;
  border-radius: 12px;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}
.quiz-question-card {
  background: #1a1f35;
  border: 1px solid #2a2f45;
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1rem;
}
.quiz-question-card .quiz-option {
  cursor: pointer;
  border: 2px solid #2a2f45;
  border-radius: 10px;
  padding: 0.75rem 1rem;
  background: #131829;
  color: #e0e0e0;
  transition: border-color 0.2s, background 0.2s;
  margin-bottom: 0.5rem;
}
.quiz-question-card .quiz-option:hover:not(.answered) {
  border-color: var(--sf-primary);
}
.quiz-question-card .quiz-option.correct {
  border-color: #10b981;
  background: rgba(16, 185, 129, 0.1);
}
.quiz-question-card .quiz-option.incorrect {
  border-color: #ef4444;
  background: rgba(239, 68, 68, 0.1);
}
.quiz-explanation {
  background: rgba(59, 130, 246, 0.08);
  border-left: 3px solid #3b82f6;
  border-radius: 0 8px 8px 0;
  padding: 0.75rem 1rem;
  margin-top: 0.75rem;
  color: #b0b8c8;
  font-size: 0.9rem;
}
.quiz-summary-card {
  background: #1a1f35;
  border: 1px solid #2a2f45;
  border-radius: 12px;
  padding: 2rem;
  text-align: center;
}

/* ===== Difficulty Badge ===== */

.badge-difficulty {
  font-size: 0.75rem;
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  font-weight: 600;
}
.badge-difficulty.beginner { background: rgba(16, 185, 129, 0.15); color: #10b981; }
.badge-difficulty.intermediate { background: rgba(245, 158, 11, 0.15); color: #f59e0b; }
.badge-difficulty.advanced { background: rgba(239, 68, 68, 0.15); color: #ef4444; }
/* Markdown rendered content in summaries */
.summary-text h2 { color: #fff; font-size: 1.3rem; margin-top: 1.5rem; margin-bottom: 0.5rem; border-bottom: 1px solid #2a2f45; padding-bottom: 0.3rem; }
.summary-text h3 { color: #e0e0e0; font-size: 1.15rem; margin-top: 1.2rem; margin-bottom: 0.4rem; }
.summary-text p { color: #e0e0e0; line-height: 1.8; margin-bottom: 1rem; }
.summary-text strong { color: #00e5ff; }
.summary-text ul, .summary-text ol { color: #e0e0e0; padding-left: 1.5rem; margin-bottom: 1rem; }
.summary-text li { margin-bottom: 0.3rem; line-height: 1.6; }
.summary-text li::marker { color: #10b981; }
.summary-text blockquote { border-left: 3px solid #3b82f6; padding-left: 1rem; color: #8892a4; font-style: italic; margin: 1rem 0; }
.summary-text code { background: #131829; color: #00e5ff; padding: 0.15rem 0.4rem; border-radius: 4px; font-size: 0.9em; }
.summary-text hr { border-color: #2a2f45; margin: 1.5rem 0; }