/* ==========================================================================
   FSUMA Dyslexia Learning Platform - Refactored Design System & Styles
   ========================================================================== */

:root {
  /* Color Palette - Bright Mode (Default Warm Cream Accessible) */
  --bg-primary: #faf9f6;
  --bg-surface: #ffffff;
  --bg-subtle: #f1f5f9;
  --bg-card: #ffffff;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-light: #e0e7ff;
  
  --secondary: #d97706;
  --secondary-hover: #b45309;
  --secondary-light: #fef3c7;
  
  --accent-teal: #0d9488;
  --accent-teal-light: #ccfbf1;
  --accent-rose: #e11d48;
  --accent-rose-light: #ffe4e6;
  
  --success: #15803d;
  --success-light: #dcfce7;
  --warning: #ea580c;
  --danger: #dc2626;

  --border-color: #cbd5e1;
  --border-focus: #6366f1;
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 10px 25px -5px rgba(79, 70, 229, 0.08);
  --shadow-lg: 0 20px 40px -10px rgba(15, 23, 42, 0.12);
  --radius-sm: 12px;
  --radius-md: 20px;
  --radius-lg: 32px;

  /* Dyslexia Typography defaults */
  --font-family: 'Lexend', 'Comic Neue', Arial, sans-serif;
  --font-scale: 1;
  --letter-spacing: 0.04em;
  --line-height: 1.8;
  --word-spacing: 0.08em;
  
  --overlay-tint: transparent;
}

/* Theme Variations */
body.theme-dark {
  --bg-primary: #0f172a;
  --bg-surface: #1e293b;
  --bg-subtle: #334155;
  --bg-card: #1e293b;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --border-color: #475569;
  --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 20px 40px -10px rgba(0, 0, 0, 0.6);
  --primary-light: #312e81;
  --secondary-light: #78350f;
  --accent-teal-light: #134e4a;
}

body.theme-cream {
  --bg-primary: #fef9c3;
  --bg-surface: #fffbeb;
  --bg-subtle: #fef3c7;
  --bg-card: #fffbeb;
  --text-primary: #451a03;
  --text-secondary: #78350f;
  --border-color: #fde68a;
}

body.theme-cyan {
  --bg-primary: #e0f2fe;
  --bg-surface: #f0f9ff;
  --bg-subtle: #bae6fd;
  --bg-card: #f0f9ff;
  --text-primary: #0c4a6e;
  --text-secondary: #0369a1;
  --border-color: #7dd3fc;
}

/* Base Setup */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: calc(16px * var(--font-scale));
}

body {
  margin: 0;
  padding: 0;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-family);
  line-height: var(--line-height);
  letter-spacing: var(--letter-spacing);
  word-spacing: var(--word-spacing);
  min-height: 100vh;
  transition: background-color 0.3s ease, color 0.3s ease;
  position: relative;
  overflow-x: hidden;
}

/* Color Tint Overlay for Visual Stress (Irlen Syndrome) */
#color-overlay-layer {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 9998;
  background-color: var(--overlay-tint);
  transition: background-color 0.3s ease;
}

/* Reading Line Focus Ruler */
#reading-line-ruler {
  position: fixed;
  left: 0;
  width: 100vw;
  height: 52px;
  background: rgba(254, 240, 138, 0.35);
  border-top: 3px dashed #d97706;
  border-bottom: 3px dashed #d97706;
  pointer-events: none;
  z-index: 9997;
  display: none;
  box-shadow: 0 0 0 9999px rgba(15, 23, 42, 0.5);
  transition: top 0.04s ease-out;
}

/* Utility Containers */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Navigation Topbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 0.85rem 0;
  transition: background-color 0.3s ease;
}

body.theme-dark .navbar {
  background: rgba(30, 41, 59, 0.92);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.brand-logo {
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 1.4rem;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

.brand-name {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.02em;
}

.brand-tagline {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: block;
  font-weight: 600;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1rem;
  border-radius: 999px;
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 700;
  font-size: 0.95rem;
  transition: all 0.2s ease;
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.1rem;
  border-radius: 999px;
  border: 2px solid var(--border-color);
  background: var(--bg-surface);
  color: var(--text-primary);
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-icon:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.menu-toggle-btn {
  display: none;
  font-size: 1rem;
  font-weight: 800;
  background: var(--bg-subtle);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  cursor: pointer;
  padding: 0.5rem 0.85rem;
}

/* User Badge Pill */
.user-profile-badge {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  background: var(--primary-light);
  padding: 0.4rem 0.85rem 0.4rem 0.4rem;
  border-radius: 999px;
  border: 2px solid var(--primary);
  cursor: pointer;
}

.user-avatar-circle {
  width: 34px;
  height: 34px;
  background: var(--primary);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.9rem;
}

.user-badge-name {
  font-weight: 800;
  font-size: 0.9rem;
  color: var(--primary);
}

/* Hero Section */
.hero {
  padding: 4rem 0 3rem;
  background: radial-gradient(circle at 10% 20%, rgba(253, 230, 138, 0.45), transparent 45%),
              radial-gradient(circle at 90% 80%, rgba(224, 242, 254, 0.7), transparent 50%);
  border-bottom: 1px solid var(--border-color);
  position: relative;
  overflow: hidden;
}

body.theme-dark .hero {
  background: radial-gradient(circle at 10% 20%, rgba(120, 53, 15, 0.3), transparent 45%),
              radial-gradient(circle at 90% 80%, rgba(30, 58, 138, 0.4), transparent 50%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 3rem;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  background: var(--secondary-light);
  color: var(--secondary-hover);
  font-weight: 800;
  border-radius: 999px;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1.25rem;
  border: 1px solid var(--secondary);
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 800;
  line-height: 1.15;
  margin: 0 0 1.25rem 0;
  color: var(--text-primary);
}

.hero-title span {
  color: var(--primary);
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  max-width: 620px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  padding: 1rem 2rem;
  background: var(--primary);
  color: #ffffff;
  font-weight: 800;
  font-size: 1.05rem;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  text-decoration: none;
  box-shadow: 0 10px 20px -5px rgba(79, 70, 229, 0.4);
  transition: all 0.25s ease;
}

.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-3px);
  box-shadow: 0 14px 28px -5px rgba(79, 70, 229, 0.5);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  padding: 1rem 2rem;
  background: var(--secondary);
  color: #ffffff;
  font-weight: 800;
  font-size: 1.05rem;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  text-decoration: none;
  box-shadow: 0 10px 20px -5px rgba(217, 119, 6, 0.4);
  transition: all 0.25s ease;
}

.btn-secondary:hover {
  background: var(--secondary-hover);
  transform: translateY(-3px);
}

/* Quick Status Header Bar */
.quick-status-bar {
  background: var(--bg-surface);
  border: 2px solid var(--primary);
  border-radius: var(--radius-md);
  padding: 0.85rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.quick-status-text {
  font-weight: 800;
  color: var(--primary);
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Section Containers & Cards */
.section {
  padding: 3.5rem 0;
}

.section-header {
  margin-bottom: 2rem;
  text-align: left;
}

.section-tag {
  color: var(--primary);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.85rem;
  margin-bottom: 0.4rem;
  display: block;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  margin: 0 0 0.5rem 0;
}

.section-description {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 720px;
  margin: 0;
}

.card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 2px solid var(--border-color);
  padding: 2rem;
  box-shadow: var(--shadow-md);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

/* Authentication Section */
.auth-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.auth-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  background: var(--bg-subtle);
  padding: 0.4rem;
  border-radius: var(--radius-sm);
}

.auth-tab-btn {
  flex: 1;
  padding: 0.75rem;
  border-radius: var(--radius-sm);
  border: none;
  background: transparent;
  font-weight: 800;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
}

.auth-tab-btn.active {
  background: var(--bg-surface);
  color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.stacked-form {
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-group label {
  font-weight: 800;
  font-size: 0.95rem;
  color: var(--text-primary);
}

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.form-input {
  width: 100%;
  padding: 0.9rem 1.1rem;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border-color);
  background: var(--bg-surface);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 1rem;
  transition: border-color 0.2s ease;
}

.form-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--primary-light);
}

.password-toggle {
  position: absolute;
  right: 1rem;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--text-muted);
}

.demo-account-pills {
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px dashed var(--border-color);
}

.demo-account-pills p {
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--text-muted);
  margin-bottom: 0.65rem;
}

.demo-btn-group {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.demo-pill {
  padding: 0.5rem 0.85rem;
  border-radius: 999px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.2s ease;
}

.demo-pill:hover {
  background: var(--primary-light);
  color: var(--primary);
  border-color: var(--primary);
}

/* Dashboard Section */
.dashboard-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.progress-bar-container {
  height: 24px;
  background: var(--bg-subtle);
  border-radius: 999px;
  overflow: hidden;
  margin: 1rem 0;
  border: 2px solid var(--border-color);
}

.progress-bar-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--secondary), var(--success));
  border-radius: 999px;
  transition: width 0.5s ease-in-out;
}

.badge-row {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

.badge-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.85rem;
  background: var(--accent-teal-light);
  color: var(--accent-teal);
  font-weight: 800;
  font-size: 0.85rem;
  border-radius: 999px;
}

/* Reader Section & Library Sidebar */
.reader-container {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 2rem;
}

.library-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.story-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.story-card {
  padding: 1rem;
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  border: 2px solid var(--border-color);
  cursor: pointer;
  transition: all 0.2s ease;
}

.story-card:hover, .story-card.active {
  border-color: var(--primary);
  background: var(--primary-light);
}

.story-card h4 {
  margin: 0 0 0.25rem 0;
  font-size: 1.05rem;
}

.story-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 700;
}

.reader-main {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.reader-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  background: var(--bg-subtle);
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-md);
  border: 2px solid var(--border-color);
}

.tool-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.tool-btn {
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border-color);
  background: var(--bg-surface);
  color: var(--text-primary);
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: all 0.2s ease;
}

.tool-btn:hover, .tool-btn.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.reading-content-box {
  padding: 2rem;
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  border: 2px solid var(--border-color);
  min-height: 280px;
  font-size: 1.25rem;
  position: relative;
  white-space: pre-wrap;
  line-height: var(--line-height);
}

.word-highlight {
  background-color: #fef08a;
  color: #0f172a;
  border-radius: 4px;
  padding: 0 4px;
  box-shadow: 0 0 0 2px #f59e0b;
}

/* Dyslexia Tools Grid */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.tool-card {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.tool-header {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.tool-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 800;
}

/* Syllable Splitter Visuals */
.syllable-result {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
  padding: 1.25rem;
  background: var(--bg-subtle);
  border-radius: var(--radius-md);
  justify-content: center;
}

.syllable-block {
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius-sm);
  background: var(--secondary-light);
  color: var(--secondary-hover);
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  box-shadow: var(--shadow-sm);
  border: 2px solid var(--secondary);
}

/* Confusables b/d/p/q Game */
.confusables-board {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  padding: 1.5rem;
  background: var(--bg-subtle);
  border-radius: var(--radius-md);
  text-align: center;
}

.letter-target-card {
  font-size: 4rem;
  font-weight: 900;
  color: var(--primary);
  width: 100px;
  height: 100px;
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  border: 3px solid var(--primary);
}

.choice-buttons-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  width: 100%;
}

.choice-btn {
  padding: 0.85rem;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border-color);
  background: var(--bg-surface);
  font-weight: 800;
  font-size: 1.2rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.choice-btn:hover {
  border-color: var(--primary);
  background: var(--primary-light);
}

/* Settings Modal & Panel */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(6px);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-content {
  background: var(--bg-surface);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 640px;
  max-height: 90vh;
  overflow-y: auto;
  padding: 2.25rem;
  box-shadow: var(--shadow-lg);
  border: 2px solid var(--border-color);
  transform: translateY(20px);
  transition: transform 0.3s ease;
}

.modal-overlay.active .modal-content {
  transform: translateY(0);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.modal-title {
  margin: 0;
  font-size: 1.6rem;
  font-weight: 800;
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.6rem;
  cursor: pointer;
  color: var(--text-muted);
  padding: 0.25rem;
}

.settings-grid {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.settings-group {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.settings-group label {
  font-weight: 800;
  font-size: 1rem;
}

.theme-options-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: 0.75rem;
}

.theme-option-btn {
  padding: 0.75rem;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border-color);
  background: var(--bg-subtle);
  color: var(--text-primary);
  font-weight: 800;
  font-size: 0.85rem;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  transition: all 0.2s ease;
}

.theme-option-btn.active {
  border-color: var(--primary);
  background: var(--primary-light);
  color: var(--primary);
}

.status-badge-panel {
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  background: var(--secondary-light);
  border: 2px solid var(--secondary);
  color: var(--secondary-hover);
  font-weight: 800;
  font-size: 1.05rem;
  text-align: center;
  margin-top: 1rem;
}

/* Footer & Contact Information */
.footer {
  background: var(--bg-surface);
  border-top: 2px solid var(--border-color);
  padding: 3.5rem 0 2rem;
  margin-top: 4rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 2.5rem;
}

.footer-brand p {
  color: var(--text-secondary);
  max-width: 400px;
}

.footer-contact-card {
  background: var(--bg-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  border: 2px solid var(--border-color);
}

.footer-contact-card h5 {
  margin: 0 0 0.5rem 0;
  font-size: 1rem;
}

.contact-email-link {
  color: var(--primary);
  font-weight: 800;
  text-decoration: none;
  word-break: break-all;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.contact-email-link:hover {
  text-decoration: underline;
}

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 600;
}

/* Responsive Rules */
@media (max-width: 900px) {
  .hero-grid, .auth-grid, .dashboard-grid, .reader-container, .footer-grid {
    grid-template-columns: 1fr;
  }
  .menu-toggle-btn {
    display: block;
  }
  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 1rem;
    right: 1rem;
    background: var(--bg-surface);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1rem;
    box-shadow: var(--shadow-lg);
    flex-direction: column;
    align-items: stretch;
  }
  .nav-menu.open {
    display: flex;
  }
}