/* ===== CSS Variables ===== */
:root {
    --color-primary: #FF6B6B;
    --color-primary-dark: #EE5A5A;
    --color-secondary: #4ECDC4;
    --color-secondary-dark: #3DBDB4;
    --color-good: #6BCB77;
    --color-good-light: #E8F8EA;
    --color-bad: #FF8C42;
    --color-bad-light: #FFF0E6;
    --color-background: #FFF9F0;
    --color-surface: #FFFFFF;
    --color-text: #2D3436;
    --color-text-light: #636E72;
    --color-border: #E0E0E0;
    --color-shadow: rgba(0, 0, 0, 0.1);
    --color-overlay: rgba(0, 0, 0, 0.5);
    
    --font-family: 'Nunito', -apple-system, BlinkMacSystemFont, sans-serif;
    --border-radius: 16px;
    --border-radius-lg: 24px;
    --border-radius-full: 50%;
    
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;
    
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ===== Base Styles ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    background: var(--color-background);
    color: var(--color-text);
    min-height: 100vh;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

/* ===== Screen Management ===== */
.screen {
    display: none !important;
    min-height: 100vh;
}

.screen.active {
    animation: fadeIn 0.3s ease;
}

/* Centered screens (login, register, loading) */
#loading-screen.active,
#login-screen.active,
#register-screen.active {
    display: flex !important;
    align-items: center;
    justify-content: center;
}

/* Dashboard uses block layout */
#dashboard-screen.active {
    display: block !important;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* ===== Loading Screen ===== */
#loading-screen {
    /* display handled by .screen.active */
    background: linear-gradient(135deg, #FF6B6B 0%, #FF8E53 50%, #FFA751 100%);
}

.loading-content {
    text-align: center;
    color: white;
}

.loading-emoji {
    font-size: 80px;
    animation: bounce 1s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

.loading-content h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin: var(--spacing-md) 0;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
}

.loading-spinner {
    width: 40px;
    height: 40px;
    margin: var(--spacing-lg) auto;
    border: 4px solid rgba(255,255,255,0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ===== Login Screen ===== */
#login-screen, #register-screen {
    /* display handled by .screen.active */
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: var(--spacing-lg);
}

.login-container {
    background: var(--color-surface);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    width: 100%;
    max-width: 400px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.2);
}

.login-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.login-logo {
    font-size: 60px;
    margin-bottom: var(--spacing-md);
}

.login-header h1 {
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-text);
}

.login-header p {
    color: var(--color-text-light);
    margin-top: var(--spacing-sm);
}

.subdomain-display span {
    font-weight: 700;
    color: var(--color-primary);
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-group label {
    font-weight: 600;
    color: var(--color-text);
}

.form-group input, .form-group select {
    padding: var(--spacing-md);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-family: inherit;
    transition: border-color var(--transition-fast);
}

.form-group input:focus, .form-group select:focus {
    outline: none;
    border-color: var(--color-primary);
}

.form-group small {
    color: var(--color-text-light);
    font-size: 0.85rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 107, 107, 0.4);
}

.btn-secondary {
    background: var(--color-border);
    color: var(--color-text);
}

.btn-secondary:hover {
    background: #d0d0d0;
}

.btn-danger {
    background: linear-gradient(135deg, #ff4757 0%, #c0392b 100%);
    color: white;
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.1rem;
}

.btn-emoji {
    font-size: 1.2rem;
}

.error-message {
    color: #e74c3c;
    font-size: 0.9rem;
    text-align: center;
    min-height: 1.5rem;
}

.login-footer {
    text-align: center;
    margin-top: var(--spacing-lg);
    color: var(--color-text-light);
}

.login-footer a {
    color: var(--color-primary);
    font-weight: 700;
    text-decoration: none;
}

/* ===== Dashboard Header ===== */
.dashboard-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    background: linear-gradient(135deg, #FF6B6B 0%, #FF8E53 100%);
    color: white;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.header-logo {
    font-size: 1.8rem;
}

.header-title {
    font-size: 1.4rem;
    font-weight: 800;
}

.header-right {
    display: flex;
    gap: var(--spacing-sm);
}

.icon-btn {
    background: rgba(255,255,255,0.2);
    border: none;
    width: 44px;
    height: 44px;
    border-radius: var(--border-radius-full);
    font-size: 1.3rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.icon-btn:hover {
    background: rgba(255,255,255,0.3);
    transform: scale(1.1);
}

/* ===== Streak Banner ===== */
.streak-banner {
    background: linear-gradient(135deg, #f39c12 0%, #e74c3c 100%);
    color: white;
    padding: var(--spacing-sm) var(--spacing-lg);
    text-align: center;
}

.streak-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
}

.streak-icon {
    font-size: 1.5rem;
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.2); }
}

.streak-text {
    font-weight: 700;
    font-size: 1.1rem;
}

.streak-best {
    font-size: 0.9rem;
    opacity: 0.9;
}

/* ===== Today's Score ===== */
.today-score {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-xl);
    background: var(--color-surface);
    margin: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 4px 20px var(--color-shadow);
}

.score-card {
    text-align: center;
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    min-width: 100px;
}

.score-card.good {
    background: var(--color-good-light);
}

.score-card.bad {
    background: var(--color-bad-light);
}

.score-emoji {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.score-value {
    font-size: 2.5rem;
    font-weight: 800;
}

.good .score-value {
    color: var(--color-good);
}

.bad .score-value {
    color: var(--color-bad);
}

.score-label {
    font-size: 0.9rem;
    color: var(--color-text-light);
    font-weight: 600;
}

.score-divider {
    display: flex;
    flex-direction: column;
    align-items: center;
    color: var(--color-text-light);
}

.score-date {
    font-weight: 700;
    font-size: 0.9rem;
    text-transform: uppercase;
}

/* ===== Emoji Section ===== */
.emoji-section {
    padding: 0 var(--spacing-lg) var(--spacing-xxl);
}

.emoji-section h2 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.emoji-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(60px, 1fr));
    gap: var(--spacing-sm);
    min-height: 80px;
}

.emoji-item {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    padding: var(--spacing-sm);
    background: var(--color-surface);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-fast);
    animation: popIn 0.3s ease;
    box-shadow: 0 2px 8px var(--color-shadow);
}

@keyframes popIn {
    0% { transform: scale(0); opacity: 0; }
    70% { transform: scale(1.1); }
    100% { transform: scale(1); opacity: 1; }
}

.emoji-item:hover {
    transform: scale(1.15);
    box-shadow: 0 4px 16px var(--color-shadow);
}

.emoji-item.removing {
    animation: popOut 0.3s ease forwards;
}

@keyframes popOut {
    0% { transform: scale(1); opacity: 1; }
    100% { transform: scale(0); opacity: 0; }
}

.empty-state {
    text-align: center;
    padding: var(--spacing-xxl);
    color: var(--color-text-light);
}

.empty-emoji {
    font-size: 4rem;
    display: block;
    margin-bottom: var(--spacing-md);
}

.empty-state p {
    font-size: 1.1rem;
}

.empty-hint {
    font-size: 0.9rem !important;
    opacity: 0.7;
}

/* ===== FAB Button ===== */
.fab {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 64px;
    height: 64px;
    border-radius: var(--border-radius-full);
    background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-secondary-dark) 100%);
    color: white;
    border: none;
    font-size: 2.5rem;
    font-weight: 300;
    cursor: pointer;
    box-shadow: 0 6px 20px rgba(78, 205, 196, 0.4);
    transition: all var(--transition-fast);
    z-index: 99;
}

.fab:hover {
    transform: scale(1.1) rotate(90deg);
    box-shadow: 0 8px 30px rgba(78, 205, 196, 0.5);
}

.fab:active {
    transform: scale(0.95);
}

/* ===== Modal ===== */
.modal {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 200;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.modal.active {
    display: flex;
    animation: fadeIn 0.2s ease;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: var(--color-overlay);
}

.modal-content {
    position: relative;
    background: var(--color-surface);
    border-radius: var(--border-radius-lg);
    max-width: 500px;
    width: 100%;
    max-height: 85vh;
    overflow-y: auto;
    overflow-x: hidden;
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from { transform: translateY(30px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    background: var(--color-surface);
    z-index: 1;
}

.modal-header h2 {
    font-size: 1.3rem;
    font-weight: 800;
}

.modal-close {
    background: none;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: var(--color-text-light);
    line-height: 1;
    padding: var(--spacing-xs);
    transition: color var(--transition-fast);
}

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

/* ===== Emoji Picker Modal ===== */
.emoji-picker-modal {
    max-width: 480px;
    width: calc(100% - 2rem);
}

.emoji-picker-section {
    padding: var(--spacing-lg);
    overflow-x: hidden;
}

.emoji-picker-section h3 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--color-good);
}

.emoji-picker-section.bad-section h3 {
    color: var(--color-bad);
}

.emoji-picker-grid {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: var(--spacing-sm);
    width: 100%;
}

.emoji-picker-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    padding: var(--spacing-sm);
    aspect-ratio: 1;
    min-width: 0;
    background: var(--color-background);
    border: 2px solid transparent;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.emoji-picker-btn:hover {
    transform: scale(1.15);
    border-color: var(--color-primary);
    background: white;
}

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

/* ===== History Modal ===== */
.history-modal {
    max-width: 500px;
}

.history-container {
    padding: var(--spacing-lg);
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.history-day {
    background: var(--color-background);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
}

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

.history-date {
    font-weight: 700;
}

.history-score {
    display: flex;
    gap: var(--spacing-md);
    font-size: 0.9rem;
}

.history-good {
    color: var(--color-good);
    font-weight: 600;
}

.history-bad {
    color: var(--color-bad);
    font-weight: 600;
}

.history-emojis {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    font-size: 1.5rem;
}

.history-day.good-day {
    border-left: 4px solid var(--color-good);
}

.history-day.bad-day {
    border-left: 4px solid var(--color-bad);
}

/* ===== Stats Modal ===== */
.stats-modal {
    max-width: 500px;
}

.stats-container {
    padding: var(--spacing-lg);
}

.stats-summary {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.stat-item {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--color-background);
    border-radius: var(--border-radius);
}

.stat-value {
    display: block;
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-primary);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--color-text-light);
}

.stats-container h3 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-md);
}

.achievements-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.achievement-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--color-background);
    border-radius: var(--border-radius);
}

.achievement-icon {
    font-size: 2rem;
}

.achievement-info h4 {
    font-size: 0.95rem;
    font-weight: 700;
}

.achievement-info p {
    font-size: 0.8rem;
    color: var(--color-text-light);
}

.achievement-locked {
    opacity: 0.4;
    filter: grayscale(1);
}

/* ===== Settings Modal ===== */
.settings-modal {
    max-width: 450px;
}

.settings-container {
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.setting-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    background: var(--color-background);
    border-radius: var(--border-radius);
}

.setting-item label:first-child {
    font-weight: 600;
}

.setting-item select {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    font-family: inherit;
    min-width: 180px;
}

/* Toggle Switch */
.toggle {
    position: relative;
    display: inline-block;
    width: 52px;
    height: 28px;
}

.toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    inset: 0;
    background: var(--color-border);
    border-radius: 28px;
    transition: var(--transition-fast);
}

.toggle-slider::before {
    content: '';
    position: absolute;
    height: 22px;
    width: 22px;
    left: 3px;
    bottom: 3px;
    background: white;
    border-radius: 50%;
    transition: var(--transition-fast);
}

.toggle input:checked + .toggle-slider {
    background: var(--color-secondary);
}

.toggle input:checked + .toggle-slider::before {
    transform: translateX(24px);
}

.setting-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

/* ===== PIN Modal ===== */
.pin-modal {
    max-width: 350px;
}

.pin-container {
    padding: var(--spacing-xl);
    text-align: center;
}

.pin-input-container {
    margin: var(--spacing-lg) 0;
}

#pin-input {
    width: 150px;
    padding: var(--spacing-md);
    font-size: 1.5rem;
    text-align: center;
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    letter-spacing: 0.5rem;
}

#pin-input:focus {
    outline: none;
    border-color: var(--color-primary);
}

/* ===== Toast ===== */
.toast-container {
    position: fixed;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    z-index: 300;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    background: var(--color-text);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius);
    font-weight: 600;
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    animation: toastIn 0.3s ease;
}

.toast.success {
    background: var(--color-good);
}

.toast.error {
    background: #e74c3c;
}

.toast.removing {
    animation: toastOut 0.3s ease forwards;
}

@keyframes toastIn {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

@keyframes toastOut {
    from { transform: translateY(0); opacity: 1; }
    to { transform: translateY(20px); opacity: 0; }
}

/* ===== Responsive ===== */
@media (max-width: 600px) {
    .today-score {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .score-divider {
        order: -1;
    }
    
    .achievements-list {
        grid-template-columns: 1fr;
    }
    
    .stats-summary {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        max-height: 90vh;
        margin: var(--spacing-md);
    }
    
    .emoji-picker-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* ===== Celebration Animation ===== */
.celebrate {
    animation: celebrate 0.5s ease;
}

@keyframes celebrate {
    0%, 100% { transform: scale(1); }
    25% { transform: scale(1.1) rotate(-5deg); }
    50% { transform: scale(1.2); }
    75% { transform: scale(1.1) rotate(5deg); }
}

/* ===== Shake Animation ===== */
.shake {
    animation: shake 0.5s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}