/* ==========================================================================
   Design System & Variables
   ========================================================================== */
:root {
  /* Colors */
  --color-primary: #EC4899;      /* Preply Pink */
  --color-primary-hover: #DB2777;
  --color-primary-light: rgba(236, 72, 153, 0.1);
  --color-dark: #12151D;         /* Dark Slate */
  --color-light: #F5F5F7;        /* Light Gray BG */
  --color-surface: #FFFFFF;      /* White */
  --color-accent: #FCD34D;       /* Light Yellow */
  --color-accent-hover: #FBBF24;
  --color-text: #384047;         /* Body Text */
  --color-muted: #8796A1;        /* Muted Text */
  --color-danger: #EF4444;
  --color-danger-hover: #DC2828;
  --color-success: #10B981;
  --color-border: #E5E7EB;
  --color-glass: rgba(255, 255, 255, 0.8);

  /* Typography */
  --font-sans: 'Outfit', system-ui, -apple-system, sans-serif;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Border Radius */
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --color-dark: #F5F5F7;         
  --color-light: #0B0E14;        
  --color-surface: #12151D;      
  --color-text: #E5E7EB;         
  --color-muted: #9CA3AF;
  --color-border: #1F2937;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5), 0 2px 4px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 10px 10px -5px rgba(0, 0, 0, 0.4);
  --color-glass: rgba(0, 0, 0, 0.6);
}

/* ==========================================================================
   Reset & Base Styles
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

@keyframes gradientBG {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

body {
  font-family: var(--font-sans);
  background: linear-gradient(-45deg, #fce7f3, #e0e7ff, #f3e8ff, #fff1f2);
  background-size: 400% 400%;
  animation: gradientBG 15s ease infinite;
  color: var(--color-text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: color var(--transition-normal);
}

[data-theme="dark"] body {
  background: var(--color-light);
  animation: none;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--color-dark);
  font-weight: 700;
  line-height: 1.2;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
  color: inherit;
}

input, select, textarea {
  font-family: inherit;
}

/* ==========================================================================
   Utility Classes
   ========================================================================== */
.hidden { display: none !important; }
.text-center { text-align: center; }
.text-primary { color: var(--color-primary); }
.text-danger { color: var(--color-danger); }
.text-muted { color: var(--color-muted); }
.font-bold { font-weight: 700; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }
.mb-8 { margin-bottom: 2rem; }
.mt-4 { margin-top: 1rem; }
.mt-8 { margin-top: 2rem; }
.w-full { width: 100%; }
.max-w-md { max-width: 28rem; margin-left: auto; margin-right: auto; }
.max-w-2xl { max-width: 42rem; margin-left: auto; margin-right: auto; }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 0.75rem; }
.gap-4 { gap: 1rem; }

/* ==========================================================================
   Animations
   ========================================================================== */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
  animation: fadeIn 0.4s ease-out forwards;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}
.animate-pulse {
  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* ==========================================================================
   Scrollbar & Utilities
   ========================================================================== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: rgba(0, 0, 0, 0.05);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb {
  background: var(--color-muted);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-text);
}

[data-theme="dark"] ::-webkit-scrollbar-track {
  background: rgba(255, 255, 255, 0.05);
}

/* ==========================================================================
   Components
   ========================================================================== */
/* Container */
.container {
  min-height: 100vh;
  padding: 2rem 1rem;
  display: flex;
  flex-direction: column;
}

.container-center {
  justify-content: center;
  align-items: center;
}

/* Cards & Surfaces */
.card {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: 2rem;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
  transition: background-color var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.card-glass {
  background: var(--color-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-lg);
  font-weight: 700;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.btn:active { transform: scale(0.98); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-surface);
  box-shadow: 0 4px 14px 0 rgba(236, 72, 153, 0.39);
}
.btn-primary:hover:not(:disabled) { background-color: var(--color-primary-hover); }

.btn-secondary {
  background-color: var(--color-dark);
  color: var(--color-surface);
}
.btn-secondary:hover:not(:disabled) { background-color: #000; }

.btn-outline {
  background-color: transparent;
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
}
.btn-outline:hover:not(:disabled) {
  background-color: var(--color-light);
}

.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  transition: all var(--transition-fast);
  padding: 0;
  box-shadow: none;
}
.btn-icon:hover {
  background-color: var(--color-light);
}
.btn-icon-small {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  transition: all var(--transition-fast);
  padding: 0;
  box-shadow: none;
}
.btn-icon-small:hover {
  background-color: var(--color-light);
}

.tutorial-launch {
  padding: 1rem 1.15rem;
  display: flex;
  align-items: center;
  gap: 0.9rem;
  text-align: left;
  color: var(--color-text);
  border: 2px solid var(--color-border);
  box-shadow: var(--shadow-md);
}

.tutorial-launch:hover {
  transform: translateY(-2px) rotate(-0.3deg);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-lg);
}

.tutorial-launch-icon {
  width: 2.75rem;
  height: 2.75rem;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border-radius: 50%;
  color: #24231f;
  background: var(--color-accent);
}

.tutorial-launch strong,
.tutorial-launch small { display: block; }
.tutorial-launch small { margin-top: 0.15rem; color: var(--color-muted); }
.tutorial-launch-arrow { margin-left: auto; color: var(--color-primary); }

.btn-back-to-lessons {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-text);
  background: var(--color-surface);
  border: 2px solid var(--color-border);
}

.btn-back-to-lessons:hover {
  color: #24231f;
  background: var(--color-accent);
  border-color: #24231f;
}

.tutorial-open { overflow: hidden; }

.tutorial-overlay {
  position: fixed;
  inset: 0;
  z-index: 1200;
  display: grid;
  place-items: center;
  padding: 1rem;
  background: rgba(36, 35, 31, 0.7);
  backdrop-filter: blur(5px);
}

.tutorial-card {
  position: relative;
  width: min(100%, 27rem);
  padding: 2rem;
  text-align: center;
  color: var(--color-text);
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-2xl);
  box-shadow: 8px 8px 0 var(--color-accent);
  animation: fadeIn 0.25s ease-out;
}

.tutorial-close {
  position: absolute;
  top: 0.85rem;
  right: 0.85rem;
  width: 2.25rem;
  height: 2.25rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: var(--color-text);
}
.tutorial-close:hover { background: var(--color-light); }

.tutorial-visual {
  width: 6.5rem;
  height: 6.5rem;
  display: grid;
  place-items: center;
  margin: 0.5rem auto 1.5rem;
  color: #24231f;
  background: var(--color-accent);
  border: 2px solid var(--color-border);
  border-radius: 42% 58% 54% 46%;
  transform: rotate(-3deg);
}
.tutorial-visual span { font-size: 3.25rem; transform: rotate(3deg); }
.tutorial-eyebrow { margin-bottom: 0.5rem; color: var(--color-primary); font-size: 0.8rem; font-weight: 800; text-transform: uppercase; letter-spacing: 0.08em; }
.tutorial-description { min-height: 4.5rem; margin: 0.75rem 0 1.25rem; color: var(--color-muted); }
.tutorial-dots { display: flex; justify-content: center; gap: 0.45rem; margin-bottom: 1.5rem; }
.tutorial-dot { width: 0.55rem; height: 0.55rem; border-radius: 99px; background: var(--color-border); transition: width var(--transition-fast), background var(--transition-fast); }
.tutorial-dot.active { width: 1.5rem; background: var(--color-primary); }
.tutorial-actions { display: flex; gap: 0.75rem; }
.tutorial-actions .btn { flex: 1; }
.tutorial-back { color: var(--color-text); background: var(--color-light); border: 2px solid var(--color-border); }
.tutorial-next { color: #fff; }

.btn-danger {
  background-color: var(--color-danger);
  color: var(--color-surface);
}
.btn-danger:hover:not(:disabled) { background-color: var(--color-danger-hover); }

/* Forms */
.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-muted);
  margin-bottom: 0.5rem;
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background-color: var(--color-light);
  color: var(--color-dark);
  font-size: 1rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
  background-color: var(--color-surface);
}

input[type="file"] {
  background-color: var(--color-light);
  border: 1px dashed var(--color-muted);
  cursor: pointer;
}
input[type="file"]:hover {
  border-color: var(--color-primary);
}
input[type="file"]::-webkit-file-upload-button {
  background-color: var(--color-primary);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  padding: 0.5rem 1rem;
  margin-right: 1rem;
  cursor: pointer;
  font-weight: bold;
  font-family: inherit;
  transition: background-color var(--transition-fast);
}
input[type="file"]::-webkit-file-upload-button:hover {
  background-color: var(--color-primary-hover);
}
input[type="file"]::file-selector-button {
  background-color: var(--color-primary);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  padding: 0.5rem 1rem;
  margin-right: 1rem;
  cursor: pointer;
  font-weight: bold;
  font-family: inherit;
  transition: background-color var(--transition-fast);
}
input[type="file"]::file-selector-button:hover {
  background-color: var(--color-primary-hover);
}

select.form-control {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%238796A1'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  background-size: 1.25rem;
}

/* Alerts */
.alert {
  padding: 1rem;
  border-radius: var(--radius-lg);
  margin-bottom: 1.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  text-align: center;
}

.alert-danger {
  background-color: rgba(239, 68, 68, 0.1);
  color: var(--color-danger);
  border: 1px solid rgba(239, 68, 68, 0.2);
}

.alert-success {
  background-color: rgba(16, 185, 129, 0.1);
  color: var(--color-success);
  border: 1px solid rgba(16, 185, 129, 0.2);
}

/* Modals */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
  padding: 1rem;
}

.modal-content {
  background-color: var(--color-surface);
  border-radius: var(--radius-2xl);
  padding: 2rem;
  width: 100%;
  max-width: 28rem;
  position: relative;
  box-shadow: var(--shadow-xl);
  animation: fadeIn 0.3s ease-out;
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  font-size: 1.5rem;
  color: var(--color-muted);
  cursor: pointer;
}

.modal-close:hover { color: var(--color-dark); }

/* Custom Scrollbar */
.custom-scrollbar::-webkit-scrollbar {
  width: 8px;
}
.custom-scrollbar::-webkit-scrollbar-track {
  background: var(--color-light);
  border-radius: 10px;
}
.custom-scrollbar::-webkit-scrollbar-thumb {
  background: #D1D5DB;
  border-radius: 10px;
}
.custom-scrollbar::-webkit-scrollbar-thumb:hover {
  background: var(--color-muted);
}

/* Specific UI Elements */
.emoji-display {
  font-size: 5rem;
  margin-bottom: 1.5rem;
  filter: drop-shadow(0 4px 6px rgba(0,0,0,0.1));
}

.phrase-title {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  margin-bottom: 0.5rem;
}

.lesson-list-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  margin-bottom: 0.75rem;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.lesson-list-item:hover {
  border-color: var(--color-muted);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.tab-group {
  display: flex;
  background: var(--color-surface);
  padding: 0.5rem;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  margin-bottom: 2rem;
  border: 1px solid var(--color-border);
}

.tab-btn {
  flex: 1;
  padding: 0.75rem;
  font-weight: 700;
  border-radius: var(--radius-lg);
  color: var(--color-muted);
}

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

.audio-preview {
  margin-top: 1rem;
  background: var(--color-light);
  padding: 1rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.user-list-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--color-surface);
  padding: 1rem;
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
  margin-bottom: 0.75rem;
}

.badge {
  display: inline-block;
  padding: 0.25rem 0.5rem;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  border-radius: var(--radius-md);
  background-color: var(--color-light);
  color: var(--color-muted);
}

/* ==========================================================================
   Responsive (Mobile) Adjustments
   ========================================================================== */
@media (max-width: 640px) {
  .container {
    padding: 1rem 0.5rem;
  }
  .card {
    padding: 1.5rem 1rem;
  }
  h1 { font-size: 2rem !important; }
  h2 { font-size: 1.5rem !important; }
  
  .btn {
    padding: 0.6rem 1rem;
    font-size: 0.95rem;
  }
  
  .tab-group {
    flex-wrap: wrap;
  }
  .tab-btn {
    flex: 1 1 100%;
    margin-bottom: 0.5rem;
  }

  /* Headers on mobile */
  header {
    flex-direction: column;
    align-items: center !important;
    justify-content: center !important;
    gap: 0.5rem;
    text-align: center;
  }
  .btn-logout {
    order: -1;
    align-self: center !important;
    margin-bottom: 0.5rem;
    background: var(--color-light);
    padding: 0.25rem 1rem;
    border-radius: var(--radius-full);
  }
  
  .modal-content {
    padding: 1.5rem;
  }
}

/* ==========================================================================
   LingoListen 2026 — Playful editorial / soft neo-brutalism
   Visual-only layer: intentionally leaves the application behavior untouched.
   ========================================================================== */
:root {
  --color-primary: #f06449;
  --color-primary-hover: #dc4e36;
  --color-primary-light: rgba(240, 100, 73, 0.18);
  --color-dark: #24231f;
  --color-light: #f7f1e7;
  --color-surface: #fffdf7;
  --color-accent: #f6c84a;
  --color-accent-hover: #e8b72d;
  --color-text: #403d35;
  --color-muted: #746f64;
  --color-danger: #d94545;
  --color-danger-hover: #bd3030;
  --color-success: #2e8b68;
  --color-border: #2d2b27;
  --color-glass: rgba(255, 253, 247, 0.92);
  --shadow-sm: 3px 3px 0 #2d2b27;
  --shadow-md: 5px 5px 0 #2d2b27;
  --shadow-lg: 7px 7px 0 #2d2b27;
  --shadow-xl: 10px 10px 0 #2d2b27;
  --radius-md: 0.65rem;
  --radius-lg: 0.9rem;
  --radius-xl: 1.25rem;
  --radius-2xl: 1.75rem;
}

[data-theme="dark"] {
  --color-dark: #fff8eb;
  --color-light: #1f211e;
  --color-surface: #2a2c27;
  --color-text: #eee8dc;
  --color-muted: #bbb3a5;
  --color-border: #f5ead6;
  --color-primary-light: rgba(240, 100, 73, 0.24);
  --color-glass: rgba(42, 44, 39, 0.94);
  --shadow-sm: 3px 3px 0 #0f100e;
  --shadow-md: 5px 5px 0 #0f100e;
  --shadow-lg: 7px 7px 0 #0f100e;
  --shadow-xl: 10px 10px 0 #0f100e;
}

body {
  min-width: 320px;
  background-color: var(--color-light);
  background-image:
    radial-gradient(circle at 12% 18%, rgba(246, 200, 74, 0.72) 0 3px, transparent 4px),
    radial-gradient(circle at 87% 76%, rgba(121, 189, 168, 0.5) 0 4px, transparent 5px),
    linear-gradient(115deg, transparent 0 74%, rgba(179, 156, 224, 0.18) 74% 100%);
  background-size: 42px 42px, 64px 64px, 100% 100%;
  animation: none;
  letter-spacing: -0.008em;
}

[data-theme="dark"] body {
  background-color: var(--color-light);
  background-image:
    radial-gradient(circle at 12% 18%, rgba(246, 200, 74, 0.22) 0 3px, transparent 4px),
    radial-gradient(circle at 87% 76%, rgba(121, 189, 168, 0.18) 0 4px, transparent 5px);
  background-size: 42px 42px, 64px 64px;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 800;
  letter-spacing: -0.04em;
}

h1 { font-size: clamp(2.6rem, 8vw, 4.5rem); }
h2 { font-size: clamp(2rem, 5vw, 3rem); }

::selection {
  color: #24231f;
  background: #f6c84a;
}

.container {
  position: relative;
  isolation: isolate;
  padding: clamp(1.25rem, 4vw, 3.5rem) 1rem;
}

.container::before,
.container::after {
  content: "";
  position: fixed;
  z-index: -1;
  border: 2px solid var(--color-border);
  pointer-events: none;
}

.container::before {
  width: 150px;
  height: 46px;
  left: -34px;
  top: 9%;
  border-radius: 50%;
  background: #f5a9bd;
  transform: rotate(-11deg);
}

.container::after {
  width: 108px;
  height: 108px;
  right: -38px;
  bottom: 8%;
  border-radius: 32% 68% 54% 46%;
  background: #9ad7c4;
  transform: rotate(15deg);
}

.max-w-md { max-width: 31rem; }
.max-w-2xl { max-width: 56rem; }

.card {
  border: 2px solid var(--color-border);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-lg);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-normal);
}

.card:hover { box-shadow: 9px 9px 0 var(--color-border); }

#view-login > .card:first-child { transform: rotate(-0.7deg); }
#view-login > .card:nth-child(2) { transform: rotate(0.35deg); }
#view-login > .card:nth-child(2):hover { transform: rotate(0); }

#view-login h1 {
  color: var(--color-dark);
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-decoration-thickness: 0.24em;
  text-underline-offset: -0.12em;
  text-decoration-skip-ink: none;
}

.btn {
  min-height: 46px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  font-weight: 800;
  letter-spacing: 0.01em;
  transition: transform 120ms ease, box-shadow 120ms ease, background-color 120ms ease;
}

.btn:hover:not(:disabled) {
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0 var(--color-border);
}

.btn:active:not(:disabled) {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0 var(--color-border);
}

.btn-primary {
  color: #24231f;
  background: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover:not(:disabled) { background: #ff795e; }

.btn-secondary {
  color: #24231f;
  background: #9ad7c4;
}

.btn-secondary:hover:not(:disabled) { background: #7fcbb4; }

.btn-outline {
  color: var(--color-dark);
  background: var(--color-surface);
  border-color: var(--color-border);
}

.btn-danger { color: #fffdf7; }

.btn-icon,
.btn-icon-small {
  border: 2px solid var(--color-border) !important;
  background: var(--color-surface) !important;
  box-shadow: 2px 2px 0 var(--color-border) !important;
}

.btn-icon:hover,
.btn-icon-small:hover { background: var(--color-accent) !important; }

.btn-logout {
  padding: 0.55rem 0.95rem;
  color: var(--color-dark) !important;
  background: #f5a9bd;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-full);
  box-shadow: 3px 3px 0 var(--color-border);
}

.form-label {
  color: var(--color-dark);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.form-control {
  min-height: 48px;
  padding: 0.8rem 1rem;
  color: var(--color-dark);
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: 2px 2px 0 rgba(45, 43, 39, 0.18);
}

.form-control::placeholder { color: var(--color-muted); opacity: 0.76; }

input:focus, select:focus, textarea:focus {
  border-color: var(--color-border);
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
  box-shadow: 3px 3px 0 var(--color-border);
}

input[type="file"] { border: 2px dashed var(--color-border); }

input[type="file"]::-webkit-file-upload-button,
input[type="file"]::file-selector-button {
  color: #24231f;
  background: var(--color-accent);
  border: 2px solid var(--color-border);
  border-radius: 0.6rem;
}

.tab-group {
  gap: 0.45rem;
  padding: 0.55rem;
  overflow-x: auto;
  background: #ddd2f4;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
}

[data-theme="dark"] .tab-group { background: #463e57; }

.tab-btn {
  min-width: max-content;
  color: var(--color-dark);
  border: 2px solid transparent;
  border-radius: 0.8rem;
}

.tab-btn:hover { background: rgba(255, 253, 247, 0.52); }

.tab-btn.active {
  color: #24231f;
  background: var(--color-accent);
  border-color: var(--color-border);
  box-shadow: 3px 3px 0 var(--color-border);
}

.lesson-list-item,
.user-list-item {
  position: relative;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: 4px 4px 0 var(--color-border);
}

.lesson-list-item:nth-child(3n + 1) { border-left: 10px solid var(--color-primary); }
.lesson-list-item:nth-child(3n + 2) { border-left: 10px solid var(--color-accent); }
.lesson-list-item:nth-child(3n) { border-left: 10px solid #9ad7c4; }

.lesson-list-item:hover {
  transform: translate(-2px, -2px) rotate(-0.25deg);
  border-color: var(--color-border);
  box-shadow: 7px 7px 0 var(--color-border);
}

.user-list-item:nth-child(even) { background: #fff4d7; }
[data-theme="dark"] .user-list-item:nth-child(even) { background: #343127; }

.badge {
  color: #24231f;
  background: #9ad7c4;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-full);
  letter-spacing: 0.07em;
}

.alert {
  border: 2px solid currentColor;
  border-radius: var(--radius-lg);
  box-shadow: 3px 3px 0 currentColor;
}

.audio-preview {
  background: #fff4d7;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-xl);
}

[data-theme="dark"] .audio-preview { background: #343127; }

.emoji-display {
  width: 8rem;
  height: 8rem;
  display: grid;
  place-items: center;
  margin: 0 auto 1.5rem;
  background: var(--color-accent);
  border: 2px solid var(--color-border);
  border-radius: 42% 58% 54% 46%;
  box-shadow: var(--shadow-md);
  filter: none;
  transform: rotate(-3deg);
}

.phrase-title {
  font-size: clamp(2.5rem, 9vw, 4rem);
  letter-spacing: -0.055em;
}

#phrase-content {
  will-change: opacity, transform;
  transition: opacity 120ms ease-out, transform 120ms ease-out;
}

#phrase-content.phrase-exit {
  opacity: 0;
  transform: translateY(-6px);
}

#phrase-content.phrase-enter {
  animation: phrase-content-enter 240ms cubic-bezier(0.22, 1, 0.36, 1);
}

@keyframes phrase-content-enter {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.voice-warning-card {
  text-align: left;
  border: 2px solid var(--color-border);
  background: var(--color-surface);
}

.voice-warning-card h2 { margin: 0.4rem 0 0.75rem; }
.voice-warning-card > p:not(.tutorial-eyebrow) { color: var(--color-muted); line-height: 1.55; }
.voice-warning-icon {
  width: 4.5rem;
  height: 4.5rem;
  display: grid;
  place-items: center;
  margin-bottom: 1rem;
  color: var(--color-dark);
  background: var(--color-accent);
  border: 2px solid var(--color-border);
  border-radius: 42% 58% 54% 46%;
  box-shadow: var(--shadow-md);
  transform: rotate(-4deg);
}
.voice-warning-icon > span { font-size: 2.25rem; }
.voice-warning-tip {
  display: flex;
  gap: 0.65rem;
  align-items: flex-start;
  margin: 1.25rem 0;
  padding: 0.9rem;
  color: var(--color-dark);
  background: var(--color-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-size: 0.88rem;
  line-height: 1.4;
}

/* Desktop practice cards: 20% smaller while preserving the mobile size. */
@media (min-width: 641px) {
  .phrase-title {
    font-size: clamp(1.6rem, 5.76vw, 2.56rem);
  }
}

.modal-overlay {
  background: rgba(36, 35, 31, 0.68);
  backdrop-filter: blur(2px);
}

.modal-content {
  border: 2px solid var(--color-border);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-xl);
}

.modal-close {
  width: 2.25rem;
  height: 2.25rem;
  display: grid;
  place-items: center;
  color: #24231f;
  background: var(--color-accent);
  border: 2px solid var(--color-border);
  border-radius: 50%;
}

#view-admin > header.card {
  background: #9ad7c4;
  transform: rotate(-0.35deg);
}

#view-student > header,
#view-practice > header {
  padding: 1rem 1.25rem;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
}

#btn-generate-ai {
  color: #24231f !important;
  background: #ddd2f4 !important;
  border: 2px solid var(--color-border) !important;
  box-shadow: var(--shadow-sm) !important;
}

#btn-save-settings { background: var(--color-accent); }

#toast-container {
  border: 2px solid var(--color-border);
  box-shadow: var(--shadow-md) !important;
}

@media (max-width: 640px) {
  .container { padding: 4.5rem 0.75rem 1.5rem; }
  .container::before { width: 100px; height: 34px; }
  .container::after { width: 76px; height: 76px; }
  .card { padding: 1.35rem 1rem; box-shadow: 5px 5px 0 var(--color-border); }
  .tab-group { flex-wrap: nowrap; }
  .tab-btn { flex: 0 0 auto; margin: 0; }
  .lesson-list-item, .user-list-item { padding: 0.9rem; }
  #view-admin { margin-top: 0 !important; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}