/* ===================================
   NUMO - Educational Number App
   Design System & Styles
   =================================== */

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

:root {
    /* Colors - Pastel Palette */
    --color-pastel-blue: #e1f0ff;
    --color-pastel-mint: #e2f5ee;
    --color-pastel-yellow: #fff9db;
    --color-pastel-pink: #ffeaf2;

    /* Primary & Accent Colors */
    --color-primary: #4c99e6;
    --color-primary-dark: #3a7bc8;
    --color-success: #13ec6d;
    --color-text-dark: #0e141b;
    --color-text-light: #6b7280;
    --color-bg-light: #f6f7f8;
    --color-white: #ffffff;

    /* Typography */
    --font-display: 'Montserrat', sans-serif;
    --font-body: 'Open Sans', sans-serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* Border Radius */
    --radius-sm: 0.75rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    --radius-xl: 2rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    background-color: var(--color-bg-light);
    color: var(--color-text-dark);
    min-height: 100vh;
    overflow-x: hidden;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

/* === APP CONTAINER === */
.app-container {
    position: relative;
    width: 100%;
    min-height: 100vh;
    max-width: 1024px;
    margin: 0 auto;
    background-color: var(--color-white);
}

/* === VIEW SYSTEM === */
.view {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.view.active {
    opacity: 1;
    visibility: visible;
    position: relative;
}

/* === TOP BAR === */
.top-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--color-white);
}

.app-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text-dark);
    flex: 1;
    text-align: center;
}

.icon-btn {
    width: 3rem;
    height: 3rem;
    border: none;
    background-color: var(--color-white);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.icon-btn:hover {
    background-color: var(--color-bg-light);
    box-shadow: var(--shadow-md);
}

.icon-btn:active {
    transform: scale(0.95);
}

.icon-btn .material-symbols-outlined {
    color: var(--color-primary);
    font-size: 1.5rem;
}

.icon-btn-placeholder {
    width: 3rem;
    height: 3rem;
}

/* === HEADLINE SECTION === */
.headline-section {
    text-align: center;
    margin-bottom: 1rem;
    padding: 0 1rem;
}

.headline {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--color-text-dark);
    margin-bottom: 0.25rem;
}

.subheadline {
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--color-text-light);
}

/* === PRACTICE MODE SECTION === */
.practice-mode-section {
    padding: 0 1.5rem;
    margin-bottom: 0.75rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.practice-mode-btn {
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    background: linear-gradient(135deg, #13ec6d 0%, #10b981 100%);
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: 0 4px 12px rgba(19, 236, 109, 0.3);
}

.practice-mode-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(19, 236, 109, 0.4);
}

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

.practice-mode-btn .material-symbols-outlined {
    font-size: 2.5rem;
    color: white;
    flex-shrink: 0;
}

.practice-mode-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.125rem;
}

.practice-mode-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: white;
}

.practice-mode-subtitle {
    font-size: 0.875rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.9);
}

/* Number Grid */
.number-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
    padding: 0 1.5rem;
    margin-bottom: 1.5rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.number-btn {
    aspect-ratio: 1;
    border: none;
    border-radius: var(--radius-xl);
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 800;
    cursor: pointer;
    transition: all 0.3s var(--ease-bounce);
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100px;
}

.number-btn:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-md);
}

.number-btn:active {
    transform: scale(0.95);
}

/* Number Button Color Variants */
.number-btn.pastel-blue {
    background-color: var(--color-pastel-blue);
    color: var(--color-primary);
}

.number-btn.pastel-mint {
    background-color: var(--color-pastel-mint);
    color: #059669;
}

.number-btn.pastel-yellow {
    background-color: var(--color-pastel-yellow);
    color: #d97706;
}

.number-btn.pastel-pink {
    background-color: var(--color-pastel-pink);
    color: #e11d48;
}

.number-btn.placeholder {
    background-color: var(--color-white);
    border: 2px dashed #d1d5db;
    font-size: 2rem;
}

.number-btn.placeholder .material-symbols-outlined {
    color: var(--color-primary);
    font-size: 3rem;
}

/* === BOTTOM NAVIGATION === */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    max-width: 1024px;
    margin: 0 auto;
    display: flex;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    padding-bottom: max(var(--spacing-sm), env(safe-area-inset-bottom));
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-top: 1px solid rgba(0, 0, 0, 0.05);
}

.nav-btn {
    flex: 1;
    height: 3rem;
    border: none;
    background-color: transparent;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-btn .material-symbols-outlined {
    font-size: 1.75rem;
    color: var(--color-text-light);
    transition: color var(--transition-fast);
}

.nav-btn.active .material-symbols-outlined {
    color: var(--color-primary);
    font-variation-settings: 'FILL' 1;
}

.nav-btn:hover {
    background-color: rgba(76, 153, 230, 0.1);
}

/* === LEARNING VIEW === */
.learning-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    gap: 0.375rem;
    padding: 0.5rem var(--spacing-sm);
    padding-bottom: 120px;
    overflow-y: auto;
}

/* Number Display Section */
.number-display-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.375rem;
    width: 100%;
}

.number-circle {
    position: relative;
    width: 100%;
    max-width: 266px;
    aspect-ratio: 1;
    border-radius: var(--radius-xl);
    background-color: var(--color-pastel-blue);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
}

.big-number {
    font-family: var(--font-display);
    font-size: clamp(4.75rem, 14vw, 8.5rem);
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1;
    user-select: none;
}

.speaker-btn {
    position: absolute;
    bottom: 0.5rem;
    right: 0.5rem;
    width: 3rem;
    height: 3rem;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.speaker-btn.glass {
    background: rgba(255, 255, 255, 0.4);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: var(--shadow-md);
}

.speaker-btn:hover {
    transform: scale(1.1);
}

.speaker-btn:active {
    transform: scale(0.95);
}

.speaker-btn .material-symbols-outlined {
    font-size: 1.5rem;
    color: var(--color-primary);
}

.number-word {
    font-family: var(--font-body);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text-light);
    text-transform: capitalize;
}

/* Objects Section */
.objects-section {
    width: 100%;
    max-width: 665px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: var(--spacing-sm);
}

.objects-grid {
    display: grid;
    gap: 0.3rem;
    padding: 0.5rem;
    background-color: rgba(246, 247, 248, 0.5);
    border-radius: var(--radius-lg);
    width: 100%;
}

.object-item {
    width: 100%;
    aspect-ratio: 1;
    max-width: 66px;
    max-height: 66px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.25rem;
    animation: fadeInScale 0.3s ease backwards;
}

@media (max-width: 767px) {
    .object-item {
        max-width: 57px;
        max-height: 57px;
    }
}

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.5);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

.object-item .material-symbols-outlined {
    font-size: 2.5rem;
    font-variation-settings: 'FILL' 1;
}

/* Learning Navigation */
.learning-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 0.5rem var(--spacing-sm);
    padding-bottom: 90px;
    margin-top: auto;
}

.nav-arrow {
    width: 3rem;
    height: 3rem;
    border: none;
    background-color: var(--color-white);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-arrow:hover {
    background-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.nav-arrow:hover .material-symbols-outlined {
    color: var(--color-white);
}

.nav-arrow .material-symbols-outlined {
    font-size: 1.5rem;
    color: var(--color-primary);
    transition: color var(--transition-fast);
}

.page-indicators {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.page-indicator {
    width: 0.5rem;
    height: 0.5rem;
    border-radius: var(--radius-full);
    background-color: #d1d5db;
    transition: all var(--transition-fast);
}

.page-indicator.active {
    width: 2rem;
    height: 0.75rem;
    background-color: var(--color-primary);
}

/* === PRACTICE VIEW === */
.progress-section {
    padding: var(--spacing-md);
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.progress-label {
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-text-dark);
}

.progress-score {
    font-family: var(--font-display);
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--color-success);
}

.progress-bar {
    width: 100%;
    height: 0.75rem;
    background-color: rgba(19, 236, 109, 0.2);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background-color: var(--color-success);
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
    box-shadow: 0 0 10px rgba(19, 236, 109, 0.4);
}

/* Quiz Content */
.quiz-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    padding-bottom: 120px;
}

.quiz-question {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-text-dark);
    text-align: center;
    margin-bottom: var(--spacing-xl);
    max-width: 500px;
}

.highlight-number {
    color: var(--color-success);
    text-decoration: underline;
    text-decoration-color: rgba(19, 236, 109, 0.3);
    text-underline-offset: 4px;
}

/* Quiz Options */
.quiz-options {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
    width: 100%;
    max-width: 600px;
}

@media (min-width: 768px) {
    .quiz-options {
        grid-template-columns: repeat(3, 1fr);
    }
}

.quiz-option {
    min-width: 140px;
    min-height: 140px;
    padding: var(--spacing-lg);
    background-color: var(--color-pastel-blue);
    border: 3px solid transparent;
    border-radius: var(--radius-xl);
    font-family: var(--font-display);
    font-size: 4rem;
    font-weight: 800;
    color: var(--color-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.quiz-option:hover {
    transform: translateY(-4px) scale(1.05);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}

.quiz-option:active {
    transform: translateY(-2px) scale(1.02);
}

/* Pastel color variations for options */
.quiz-option:nth-child(1) {
    background-color: var(--color-pastel-blue);
}

.quiz-option:nth-child(2) {
    background-color: var(--color-pastel-mint);
}

.quiz-option:nth-child(3) {
    background-color: var(--color-pastel-yellow);
}

.quiz-option.correct {
    background-color: #10b981;
    color: white;
    border-color: #059669;
    transform: scale(1.1);
}

.quiz-option.incorrect {
    opacity: 0;
    pointer-events: none;
    transform: scale(0.8);
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.05);
    }
}

@keyframes fadeOut {
    to {
        opacity: 0;
        transform: scale(0.8);
    }
}

/* Confetti Canvas */
.confetti-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1000;
}

/* === RESPONSIVE DESIGN === */
@media (max-width: 767px) {
    .headline {
        font-size: 1.75rem;
    }

    .number-btn {
        font-size: 2rem;
        min-height: 80px;
    }

    .number-circle {
        width: 14rem;
        height: 14rem;
    }

    .big-number {
        font-size: 6rem;
    }

    .quiz-question {
        font-size: 1.5rem;
    }

    .quiz-option {
        font-size: 3rem;
    }
}

/* === ACCESSIBILITY === */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus visible for keyboard navigation */
button:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
}