/* ==========================================================================
   DESIGN SYSTEM & CUSTOM PROPERTIES
   ========================================================================== */
:root {
    --font-primary: 'Inter', sans-serif;
    --font-display: 'Space Grotesk', sans-serif;
    
    --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    
    /* Layout Dimensions */
    --container-width: 1100px;
    --border-radius-lg: 24px;
    --border-radius-md: 16px;
    --border-radius-sm: 8px;
    
    /* Shadow Levels */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.1);
}

/* --- THEME 1: SUNNY PARK --- */
.theme-sunny-park {
    --bg-app: hsl(45, 80%, 97%);
    --bg-card: hsl(0, 0%, 100%);
    --text-primary: hsl(200, 40%, 12%);
    --text-secondary: hsl(200, 20%, 42%);
    --accent: hsl(140, 50%, 35%); /* Soft Park Green */
    --accent-hover: hsl(140, 50%, 28%);
    --accent-light: hsl(140, 35%, 93%);
    --border: hsl(45, 40%, 90%);
    
    /* Dog Colors */
    --dog-color: hsl(35, 90%, 65%);       /* Golden Retriever */
    --dog-dark-color: hsl(35, 80%, 55%);
    --dog-light-color: hsl(35, 95%, 82%);
    --dog-nose-color: hsl(200, 40%, 12%);
}

/* --- THEME 2: COZY RUG --- */
.theme-cozy-rug {
    --bg-app: hsl(30, 40%, 95%);
    --bg-card: hsl(0, 0%, 100%);
    --text-primary: hsl(20, 40%, 12%);
    --text-secondary: hsl(20, 20%, 42%);
    --accent: hsl(25, 75%, 45%); /* Terracotta Brown */
    --accent-hover: hsl(25, 75%, 38%);
    --accent-light: hsl(25, 45%, 93%);
    --border: hsl(30, 20%, 88%);
    
    /* Dog Colors */
    --dog-color: hsl(28, 40%, 45%);       /* Chocolate Lab */
    --dog-dark-color: hsl(28, 45%, 35%);
    --dog-light-color: hsl(28, 30%, 72%);
    --dog-nose-color: hsl(28, 50%, 15%);
}

/* --- THEME 3: TWILIGHT WALK --- */
.theme-twilight-walk {
    --bg-app: hsl(220, 40%, 10%);
    --bg-card: hsl(220, 35%, 16%);
    --text-primary: hsl(220, 20%, 94%);
    --text-secondary: hsl(220, 15%, 68%);
    --accent: hsl(45, 95%, 60%); /* Warm Streetlamp Amber */
    --accent-hover: hsl(45, 95%, 50%);
    --accent-light: hsl(220, 30%, 23%);
    --border: hsl(220, 30%, 22%);
    
    /* Dog Colors */
    --dog-color: hsl(210, 15%, 80%);      /* Silver Husky */
    --dog-dark-color: hsl(210, 15%, 68%);
    --dog-light-color: hsl(210, 20%, 90%);
    --dog-nose-color: hsl(220, 40%, 10%);
}

/* ==========================================================================
   RESET & GLOBAL STYLES
   ========================================================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-primary);
    background-color: var(--bg-app);
    color: var(--text-primary);
    transition: background-color 0.4s ease, color 0.4s ease;
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* ==========================================================================
   TYPOGRAPHY & UTILITIES
   ========================================================================== */
h1, h2, h3 {
    font-family: var(--font-display);
    font-weight: 700;
    margin-bottom: 0.5rem;
}

h2 {
    font-size: 1.5rem;
    color: var(--accent);
    transition: color 0.4s ease;
}

p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.badge {
    background-color: var(--accent);
    color: var(--bg-card);
    padding: 4px 12px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    transition: background-color 0.4s ease;
}

/* ==========================================================================
   LAYOUT STRUCTURE
   ========================================================================== */
.app-header {
    background-color: var(--bg-card);
    border-bottom: 1px solid var(--border);
    padding: 1.5rem 2rem;
    box-shadow: var(--shadow-sm);
    transition: background-color 0.4s ease, border-color 0.4s ease;
}

.header-container {
    max-width: var(--container-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.logo-text {
    font-size: 2.2rem;
    color: var(--accent);
    margin: 0;
    transition: color 0.4s ease;
}

.tagline {
    font-family: var(--font-primary);
    font-weight: 500;
    font-size: 0.95rem;
    margin: 0;
    flex: 1 1 100%;
}

@media (min-width: 768px) {
    .tagline {
        flex: auto;
        margin-left: 2rem;
    }
}

.main-container {
    max-width: var(--container-width);
    width: 100%;
    margin: 2rem auto;
    padding: 0 1.5rem;
    flex: 1;
}

.app-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

@media (min-width: 950px) {
    .app-grid {
        grid-template-columns: 1.2fr 1fr;
    }
}

.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    transition: background-color 0.4s ease, border-color 0.4s ease, box-shadow 0.3s ease;
}

.card:hover {
    box-shadow: var(--shadow-lg);
}

.panel-card {
    margin-bottom: 2rem;
}

.panel-desc {
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

/* ==========================================================================
   THEME PICKER
   ========================================================================== */
.theme-picker {
    display: flex;
    gap: 0.5rem;
    background-color: var(--bg-app);
    padding: 4px;
    border-radius: 50px;
    border: 1px solid var(--border);
    transition: background-color 0.4s ease, border-color 0.4s ease;
}

.theme-btn {
    border: none;
    background: none;
    padding: 6px 14px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition-smooth);
}

.theme-btn.active {
    background-color: var(--bg-card);
    color: var(--accent);
    box-shadow: var(--shadow-sm);
}

/* ==========================================================================
   CSS ART DOG
   ========================================================================== */
.dog-sandbox {
    background-color: var(--bg-app);
    height: 320px;
    border-radius: var(--border-radius-md);
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    overflow: hidden;
    border: 1px solid var(--border);
    margin-bottom: 1.5rem;
    transition: background-color 0.4s ease, border-color 0.4s ease;
}

.dog-container {
    position: relative;
    width: 200px;
    height: 250px;
    margin-top: 20px;
}

/* Head & Shake Animations */
@keyframes shake {
    0%, 100% { transform: translateX(-50%) translateY(0) rotate(0); }
    20%, 60% { transform: translateX(-52%) translateY(-3px) rotate(-2deg); }
    40%, 80% { transform: translateX(-48%) translateY(1px) rotate(2deg); }
}

.dog-head {
    position: absolute;
    top: 25px;
    left: 50%;
    transform: translateX(-50%);
    width: 130px;
    height: 120px;
    background-color: var(--dog-color);
    border-radius: 50% 50% 40% 40%;
    z-index: 5;
    box-shadow: inset 0 -8px 0 rgba(0, 0, 0, 0.05);
    transition: background-color 0.4s ease;
}

.head-bark {
    animation: shake 0.15s ease-in-out;
}

/* Eyebrows for expressions */
.eyebrow {
    position: absolute;
    top: 28px;
    width: 20px;
    height: 4px;
    background-color: var(--dog-dark-color);
    border-radius: 2px;
    z-index: 7;
    transition: transform 0.2s ease, background-color 0.4s ease;
}

.eyebrow-left {
    left: 26px;
    transform: rotate(-5deg);
}

.eyebrow-right {
    right: 26px;
    transform: rotate(5deg);
}

/* Eyebrow expression state shifts */
.express-angry .eyebrow-left { transform: rotate(18deg) translateY(3px); }
.express-angry .eyebrow-right { transform: rotate(-18deg) translateY(3px); }
.express-sad .eyebrow-left { transform: rotate(-15deg) translateY(-2px); }
.express-sad .eyebrow-right { transform: rotate(15deg) translateY(-2px); }
.express-happy .eyebrow-left { transform: rotate(-12deg) translateY(-4px); }
.express-happy .eyebrow-right { transform: rotate(12deg) translateY(-4px); }

/* Ears */
.dog-ear {
    position: absolute;
    width: 38px;
    height: 85px;
    background-color: var(--dog-dark-color);
    border-radius: 50% 50% 30% 30%;
    z-index: 4;
    transform-origin: top center;
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275), background-color 0.4s ease;
    cursor: pointer;
}

.ear-left {
    left: 20px;
    top: 25px;
    transform: rotate(15deg);
}

.ear-right {
    right: 20px;
    top: 25px;
    transform: rotate(-15deg);
}

/* Ears animations states */
.dog-ear:hover, .ears-perked .dog-ear {
    transform: translateY(-8px) scaleY(1.05);
}

.ears-perked .ear-left { transform: rotate(-8deg) translateY(-8px); }
.ears-perked .ear-right { transform: rotate(8deg) translateY(-8px); }
.ears-back .ear-left { transform: rotate(38deg) translateY(4px); }
.ears-back .ear-right { transform: rotate(-38deg) translateY(4px); }

/* Eyes & Blinking Animation */
@keyframes blink {
    0%, 90%, 100% { transform: scaleY(1); }
    95% { transform: scaleY(0.1); }
}

.dog-eye {
    position: absolute;
    top: 38px;
    width: 16px;
    height: 20px;
    background-color: var(--bg-card);
    border-radius: 50%;
    animation: blink 4s infinite;
    transition: background-color 0.4s ease;
}

.eye-left { left: 28px; }
.eye-right { right: 28px; }

.pupil {
    width: 10px;
    height: 12px;
    background-color: var(--dog-nose-color);
    border-radius: 50%;
    margin: 3px auto 0;
    transition: transform 0.08s ease-out, background-color 0.4s ease;
}

/* Snout & Mouth */
.dog-snout {
    position: absolute;
    bottom: 12px;
    left: 50%;
    transform: translateX(-50%);
    width: 65px;
    height: 45px;
    background-color: var(--dog-light-color);
    border-radius: 50% 50% 45% 45%;
    z-index: 6;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    transition: background-color 0.4s ease;
    cursor: pointer;
}

.dog-nose {
    width: 22px;
    height: 14px;
    background-color: var(--dog-nose-color);
    border-radius: 50% 50% 40% 40%;
    margin: 6px auto 0;
    transition: background-color 0.4s ease;
}

.dog-mouth {
    width: 14px;
    height: 6px;
    background-color: var(--dog-nose-color);
    border-radius: 0 0 50px 50px;
    margin: 4px auto 0;
    transition: all 0.15s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.mouth-bark {
    height: 12px;
    width: 12px;
    border-radius: 50%;
    background-color: hsl(0, 70%, 35%);
    transform: scale(1.6);
}

/* Body & Legs */
.dog-body {
    position: absolute;
    top: 105px;
    left: 50%;
    transform: translateX(-50%);
    width: 110px;
    height: 130px;
    background-color: var(--dog-color);
    border-radius: 50% 50% 40% 40%;
    z-index: 2;
    transition: background-color 0.4s ease;
}

.dog-leg {
    position: absolute;
    bottom: -15px;
    width: 24px;
    height: 45px;
    background-color: var(--dog-dark-color);
    border-radius: 12px;
    z-index: 1;
    transition: background-color 0.4s ease;
    cursor: pointer;
}

.leg-front-left { left: 12px; }
.leg-front-right { right: 12px; }

.leg-back-left {
    left: -6px;
    bottom: -10px;
    background-color: var(--dog-dark-color);
    transform: rotate(10deg);
}

.leg-back-right {
    right: -6px;
    bottom: -10px;
    background-color: var(--dog-dark-color);
    transform: rotate(-10deg);
}

/* Tail & Wags */
.dog-tail {
    position: absolute;
    bottom: 25px;
    right: -15px;
    width: 18px;
    height: 75px;
    background-color: var(--dog-dark-color);
    border-radius: 50% 50% 20% 20%;
    transform-origin: bottom center;
    transform: rotate(35deg);
    z-index: 1;
    transition: background-color 0.4s ease;
    cursor: pointer;
}

/* Wag Keyframe Animations */
@keyframes wag-slow {
    0%, 100% { transform: rotate(35deg); }
    50% { transform: rotate(50deg); }
}

@keyframes wag-medium {
    0%, 100% { transform: rotate(25deg); }
    50% { transform: rotate(65deg); }
}

@keyframes wag-fast {
    0%, 100% { transform: rotate(15deg); }
    50% { transform: rotate(75deg); }
}

@keyframes wag-helicopter {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes wag-tucked {
    0%, 100% { transform: rotate(-55deg) translate(-10px, 8px); }
}

/* Active Wag Classes */
.tail-wag-slow { animation: wag-slow 0.6s infinite ease-in-out; }
.tail-wag-medium { animation: wag-medium 0.4s infinite ease-in-out; }
.tail-wag-fast { animation: wag-fast 0.2s infinite ease-in-out; }
.tail-wag-helicopter { animation: wag-helicopter 0.15s infinite linear; }
.tail-tucked { animation: wag-tucked 1s infinite ease-in-out; }

/* ==========================================================================
   INTERPRETER OUTPUT CARD
   ========================================================================== */
.instruction-text {
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
}

.interpreter-output {
    background-color: var(--accent-light);
    border-radius: var(--border-radius-md);
    padding: 1.5rem;
    border-left: 5px solid var(--accent);
    transition: var(--transition-smooth);
    margin-bottom: 1.5rem;
}

.interpreter-output h3 {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.interpreter-output p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 0;
}

/* ==========================================================================
   REAL-TIME OSCILLOSCOPE CANVAS
   ========================================================================== */
.visualizer-wrapper h3 {
    font-size: 1rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.visualizer-canvas {
    width: 100%;
    height: 90px;
    background-color: var(--bg-app);
    border: 1px solid var(--border);
    border-radius: var(--border-radius-md);
    transition: background-color 0.4s ease, border-color 0.4s ease;
    display: block;
}

/* ==========================================================================
   SLIDERS & WIDGETS
   ========================================================================== */
.slider-container {
    background-color: var(--bg-app);
    padding: 1.25rem;
    border-radius: var(--border-radius-md);
    border: 1px solid var(--border);
    transition: background-color 0.4s ease, border-color 0.4s ease;
}

.slider-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: 0.75rem;
}

.app-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 8px;
    border-radius: 5px;
    background: var(--border);
    outline: none;
    margin-bottom: 1.25rem;
    transition: background 0.4s ease;
}

.app-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: transform 0.1s ease, background 0.4s ease;
}

.app-slider::-webkit-slider-thumb:hover {
    transform: scale(1.15);
}

.slider-footer {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.slider-footer strong {
    color: var(--accent);
    transition: color 0.4s ease;
}

/* ==========================================================================
   SYNTHESIZER PARAMETER SLIDERS
   ========================================================================== */
.synth-sliders {
    background-color: var(--bg-app);
    padding: 1.25rem;
    border-radius: var(--border-radius-md);
    border: 1px solid var(--border);
    margin-bottom: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
    transition: background-color 0.4s ease, border-color 0.4s ease;
}

.slider-row {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.slider-row label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.small-slider {
    margin-bottom: 0;
}

/* ==========================================================================
   SOUNDBOARD GRID
   ========================================================================== */
.sound-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.sound-btn {
    border: 1px solid var(--border);
    background-color: var(--bg-app);
    border-radius: var(--border-radius-md);
    padding: 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.sound-btn:hover {
    background-color: var(--accent-light);
    border-color: var(--accent);
    transform: translateY(-2px);
}

.sound-btn:active {
    transform: translateY(0);
}

.sound-btn.active {
    background-color: var(--accent);
    border-color: var(--accent);
}

.sound-btn.active .btn-text {
    color: var(--bg-card);
}

.sound-btn.active .btn-icon {
    transform: scale(1.15);
}

.btn-icon {
    font-size: 1.5rem;
    transition: transform 0.2s ease;
}

.btn-text {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* ==========================================================================
   QUIZ ENGINE
   ========================================================================== */
.quiz-container {
    background-color: var(--bg-app);
    padding: 1.5rem;
    border-radius: var(--border-radius-md);
    border: 1px solid var(--border);
    min-height: 200px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: background-color 0.4s ease, border-color 0.4s ease;
}

.quiz-container h3 {
    font-size: 1.15rem;
    margin-bottom: 1rem;
}

.quiz-options-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.quiz-opt-btn {
    border: 1px solid var(--border);
    background-color: var(--bg-card);
    padding: 0.75rem 1.25rem;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    text-align: left;
    color: var(--text-primary);
    transition: var(--transition-smooth);
}

.quiz-opt-btn:hover {
    border-color: var(--accent);
    background-color: var(--accent-light);
}

.quiz-result-card {
    text-align: center;
    padding: 0.5rem 0;
}

.quiz-result-card h4 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--accent);
    margin-bottom: 0.5rem;
}

.quiz-result-card p {
    font-size: 0.9rem;
}

.quiz-reset-btn {
    border: none;
    background-color: var(--accent);
    color: var(--bg-card);
    padding: 0.6rem 1.5rem;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    margin-top: 1rem;
    transition: background-color 0.2s ease;
}

.quiz-reset-btn:hover {
    background-color: var(--accent-hover);
}

.quiz-progress-bar {
    width: 100%;
    height: 6px;
    background-color: var(--border);
    border-radius: 50px;
    overflow: hidden;
}

.quiz-progress-fill {
    height: 100%;
    background-color: var(--accent);
    width: 0%;
    transition: width 0.3s ease;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.app-footer {
    text-align: center;
    padding: 2rem;
    border-top: 1px solid var(--border);
    background-color: var(--bg-card);
    color: var(--text-secondary);
    font-size: 0.85rem;
    transition: background-color 0.4s ease, border-color 0.4s ease;
}