/**
 * Unified Styles - Mobile First Approach
 * Base: Mobile (320px+)
 * Tablet: 720px+
 * Desktop: 960px+
 */

:root {
    --primary-color: #6366f1;
    --secondary-color: #ec4899;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --dark: #1f2937;
    --light: #f3f4f6;
    --border-color: #e5e7eb;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --radius: 8px;
    --spacing-sm: 0.375rem;
    --spacing-md: 0.75rem;
    --spacing-lg: 1rem;
    --spacing-xl: 2rem;
    --transition: all 0.3s ease;
    --header-height: 68px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--light);
    color: var(--text-primary);
    line-height: 1.6;
    font-size: 14px;
}

.hidden {
    display: none !important;
}

/* ============================================
   SETUP SCREEN
   ============================================ */

#setupScreen {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
}

.setup-container {
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    width: 100%;
    padding: var(--spacing-lg);
}

.setup-container h1 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.setup-subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    font-size: 0.95rem;
}

.step {
    animation: fadeIn 0.3s ease;
}

.step h2 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.step .info {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-md);
}

/* Form Styles */
form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

input[type="text"],
input[type="email"],
select {
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
}

input[type="text"]:focus,
input[type="email"]:focus,
select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* Setup Items */
.setup-item {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background-color: var(--light);
    border-radius: var(--radius);
    border-left: 4px solid var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.setup-item span {
    flex: 1;
}

.setup-item button {
    align-self: flex-end;
}

/* Lists */
.children-list,
.coins-list,
.habits-list,
.rewards-list {
    margin-bottom: var(--spacing-lg);
}

.items-list {
    margin-bottom: var(--spacing-lg);
}

/* Buttons */
.btn {
    padding: var(--spacing-md);
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    width: 100%;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: #4f46e5;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background-color: #f0f9ff;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: white;
}

.btn-danger {
    background-color: var(--danger-color);
    color: white;
}

.btn-danger:hover {
    background-color: #dc2626;
}

.btn-small {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.75rem;
    border: none;
    border-radius: var(--radius);
    width: auto;
}

.btn-edit {
    background: rgba(255, 255, 255, 0.9);
    border: none;
    border-radius: 50%;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    position: absolute;
    right: -10px;
    bottom: -10px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    padding: 0;
}

.btn-edit:hover {
    transform: scale(1.1);
    background: white;
}

/* ============================================
   MAIN SCREEN
   ============================================ */

#mainScreen {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
.header {
    background-color: white;
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    white-space: nowrap;
}

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

.children-nav {
    display: flex;
    gap: var(--spacing-sm);
    position: fixed;
    left: 50%;
    top: var(--header-height);
    transform: translateX(-50%) translateY(-70%);
    flex-wrap: wrap;
    justify-content: center;
    z-index: 101;
}

.child-nav-btn {
    width: 46px;
    height: 45px;
    border-radius: 50%;
    border: 3px solid var(--border-color);
    background: white;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.child-nav-btn:hover,
.child-nav-btn.active {
    border-color: var(--primary-color);
    background-color: #f0f9ff;
    transform: scale(1.1);
}

.header-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: none;
    background: var(--light);
    font-size: 1.25rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    min-height: 44px;
    min-width: 44px;
}

.header-btn svg {
    width: 24px;
    height: 24px;
    color: var(--text-primary);
    transition: var(--transition);
}

.header-btn:hover {
    background-color: var(--primary-color);
    transform: scale(1.1);
}

.header-btn:hover svg {
    color: white;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: var(--spacing-xl) var(--spacing-lg) var(--spacing-lg) var(--spacing-lg);
    overflow-y: auto;
}

.tab-content {
    animation: fadeIn 0.3s ease;
}

/* ============================================
   CHILD PROFILE
   ============================================ */

.child-profile {
    max-width: 100%;
    margin: 0 auto;
}

.child-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.child-avatar-container {
    position: relative;
    display: inline-block;
    margin-bottom: var(--spacing-lg);
    width: 120px;
    height: 120px;
}

.child-avatar {
    font-size: 4rem;
    line-height: 1;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.child-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.child-header h2 {
    font-size: 1.5rem;
    color: var(--text-primary);
}

.child-coins {
    background: white;
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow);
}

.child-coins h3 {
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.coins-display {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}

.coin-item {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius);
    text-align: left;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.coin-item span:first-child {
    display: block;
    font-size: 0.9rem;
    opacity: 0.9;
}

.coin-value {
    font-size: 1.5rem;
    font-weight: 700;
}

/* Habits Log */
.child-log {
    background: white;
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow);
}

.child-log h3 {
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.habits-log {
    margin-bottom: var(--spacing-lg);
    max-height: 400px;
    overflow-y: auto;
}

.log-item {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background-color: var(--light);
    border-radius: var(--radius);
    margin-bottom: var(--spacing-md);
    align-items: center;
}

.log-date {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 600;
}

.log-habit {
    font-weight: 500;
    color: var(--text-primary);
}

.log-coins {
    text-align: left;
    font-weight: 700;
    font-size: 1.1rem;
}

.log-coins.positive {
    color: var(--success-color);
}

.log-coins.negative {
    color: var(--danger-color);
}

.empty-state {
    text-align: center;
    color: var(--text-secondary);
    padding: var(--spacing-lg);
    font-style: italic;
}

/* ============================================
   PROFILE & SETTINGS
   ============================================ */

.profile-container {
    background: white;
    border-radius: var(--radius);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow);
    width: 100%;
    max-width: 100%;
    margin: 0 auto;
}

.profile-container h2,
.settings-container h2 {
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

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

/* Settings */
.settings-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

.settings-nav {
    display: flex;
    flex-direction: row;
    overflow-x: auto;
    gap: var(--spacing-sm);
    -webkit-overflow-scrolling: touch;
}

.settings-link {
    padding: var(--spacing-md) var(--spacing-lg);
    background: white;
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    cursor: pointer;
    font-weight: 600;
    color: var(--text-secondary);
    transition: var(--transition);
    text-align: left;
    white-space: nowrap;
    flex-shrink: 0;
}

.settings-link:hover,
.settings-link.active {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background-color: #f0f9ff;
}

.settings-content {
    background: white;
    border-radius: var(--radius);
    padding: var(--spacing-md);
    box-shadow: var(--shadow);
}

.settings-panel {
    animation: fadeIn 0.3s ease;
}

.settings-panel h2 {
    margin-bottom: var(--spacing-lg);
}

.settings-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background-color: var(--light);
    border-radius: var(--radius);
    margin-bottom: var(--spacing-md);
    border-left: 4px solid var(--primary-color);
    flex-direction: column;
    gap: var(--spacing-sm);
}

.settings-item div {
    display: flex;
    align-items: center;
    gap: 10px;
}

.settings-item span {
    flex: 1;
    font-weight: 500;
    width: 100%;
}

.settings-item .btn-small {
    margin-left: 0;
    align-self: flex-end;
}

.info-box {
    background-color: #f0f9ff;
    border-left: 4px solid var(--primary-color);
    padding: var(--spacing-lg);
    border-radius: var(--radius);
    margin-bottom: var(--spacing-lg);
}

.info-box p {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

.info-box button {
    margin-right: 0;
    margin-bottom: var(--spacing-md);
    width: 100%;
}

/* ============================================
   MODAL
   ============================================ */

.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn 0.3s ease;
}

.modal-content {
    background: white;
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    width: 90%;
    box-shadow: var(--shadow-lg);
    position: relative;
    animation: slideIn 0.3s ease;
}

.modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition);
}

.modal-close:hover {
    color: var(--text-primary);
    transform: rotate(90deg);
}

#modalBody h3 {
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

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

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

.modal-form .form-group label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.modal-form .form-control {
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
    width: 100%;
}

.modal-form .form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(66, 153, 225, 0.1);
}

.modal-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
    margin-top: var(--spacing-md);
    flex-direction: column;
}

.modal-buttons .btn {
    min-width: auto;
    padding: var(--spacing-md);
    font-weight: 600;
    width: auto;
}

#modalBody p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.5;
}

#habitSelect {
    width: 100%;
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 1rem;
}

.avatar-selector {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(60px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    max-height: 400px;
    overflow-y: auto;
    padding-right: var(--spacing-sm);
    padding: 0.5rem    
}

.avatar-btn {
    font-size: 0;
    padding: 0;
    border: 3px solid var(--border-color);
    background: white;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    aspect-ratio: 1;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.avatar-btn img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.avatar-btn:hover,
.avatar-btn.active {
    border-color: var(--primary-color);
    background-color: #f0f9ff;
    transform: scale(1.1);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

/* ============================================
   ANIMATIONS
   ============================================ */

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

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

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

@keyframes fadeOut {
    to {
        opacity: 0;
        transform: translateY(10px);
    }
}

/* ============================================
   TOAST NOTIFICATIONS
   ============================================ */

.toast {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: white;
    padding: var(--spacing-lg) var(--spacing-xl);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    animation: slideInUp 0.3s ease;
    z-index: 1000;
    max-width: 350px;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.toast.success {
    border-left: 4px solid #10b981;
}

.toast.success .toast-icon {
    color: #10b981;
    font-size: 1.5rem;
}

.toast.error {
    border-left: 4px solid #ef4444;
}

.toast.error .toast-icon {
    color: #ef4444;
    font-size: 1.5rem;
}

.toast-icon {
    flex-shrink: 0;
}

.toast-message {
    flex: 1;
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.95rem;
}

.toast.hide {
    animation: fadeOut 0.3s ease forwards;
}

/* ============================================
   TABLET: 720px+
   ============================================ */

@media (min-width: 720px) {
    :root {
        --spacing-sm: 0.5rem;
        --spacing-md: 1rem;
        --spacing-lg: 1.5rem;
        --header-height: 80px;
    }

    body {
        font-size: 16px;
    }

    #setupScreen {
        padding: var(--spacing-lg);
    }

    .setup-container {
        max-width: 600px;
    }

    .setup-container h1 {
        font-size: 2.5rem;
    }

    .step h2 {
        font-size: 1.5rem;
    }

    .header {
        padding: var(--spacing-md) var(--spacing-lg);
    }

    .logo {
        font-size: 1.5rem;
    }

    .header-nav {
        gap: var(--spacing-md);
        width: auto;
    }

    .child-nav-btn {
        width: 60px;
        height: 60px;        
        font-size: 1.5rem;
    }

    .child-header {
        padding: var(--spacing-xl);
        margin-bottom: var(--spacing-xl);
    }

    .child-avatar {
        font-size: 6rem;
    }

    .child-header h2 {
        font-size: 2rem;
    }

    .coins-display {
        grid-template-columns: repeat(2, 1fr);
    }

    .coin-item {
        text-align: center;
        display: flex;
        flex-direction: column;
    }

    .coin-item span:first-child {
        margin-bottom: var(--spacing-sm);
    }

    .coin-value {
        font-size: 2rem;
    }

    .log-item {
        grid-template-columns: 100px 1fr 80px;
        gap: var(--spacing-md);
        flex-direction: row;
    }

    .log-coins {
        text-align: right;
    }

    .profile-container {
        max-width: 600px;
    }

    .settings-container {
        grid-template-columns: 200px 1fr;
        gap: var(--spacing-xl);
    }

    .settings-nav {
        flex-direction: column;
        overflow: visible;
        gap: var(--spacing-md);
    }

    .settings-link {
        white-space: normal;
        flex-shrink: 1;
        padding: var(--spacing-md);
        font-size: 1rem;
    }

    .settings-content {
        padding: var(--spacing-lg);
    }

    .settings-item {
        flex-direction: row;
        gap: var(--spacing-md);
    }

    .settings-item span {
        width: auto;
    }

    .settings-item .btn-small {
        margin-left: var(--spacing-sm);
        align-self: center;
    }

    .info-box button {
        width: auto;
        margin-right: var(--spacing-md);
        margin-bottom: 0;
    }

    .modal-content {
        width: 90%;
        max-width: 800px;
        padding: var(--spacing-xl);
    }

    .avatar-selector {
        grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
        max-height: 500px;
    }

    .avatar-btn {
        font-size: 0;
        padding: 0;
    }

    .btn {
        width: auto;
        padding: var(--spacing-md) var(--spacing-lg);
    }

    .btn-small {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.875rem;
    }

    .setup-item {
        flex-direction: row;
        align-items: center;
    }

    .setup-item button {
        align-self: center;
    }

    .modal-buttons {
        flex-direction: row;
    }

    .modal-buttons .btn {
        min-width: 120px;
    }
}

/* ============================================
   DESKTOP: 960px+
   ============================================ */

@media (min-width: 960px) {
    .child-profile {
        max-width: 600px;
    }

    .log-item {
        grid-template-columns: 100px 1fr 100px;
    }

    .modal-content {
        max-width: 900px;
    }

    .avatar-selector {
        max-height: 600px;
    }

    .settings-nav {
        min-width: 150px;
    }
}

/* ============================================
   LANDSCAPE ORIENTATION
   ============================================ */

@media (max-height: 500px) and (orientation: landscape) {
    .header {
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .main-content {
        padding: var(--spacing-md);
    }

    .child-header {
        padding: var(--spacing-md);
        margin-bottom: var(--spacing-md);
    }

    .child-avatar {
        font-size: 3rem;
    }

    .child-header h2 {
        font-size: 1.25rem;
    }
}

/* ============================================
   DARK MODE (opcional - para futuro)
   ============================================ */

@media (prefers-color-scheme: dark) {
    :root {
        --light: #1f2937;
        --text-primary: #f3f4f6;
        --text-secondary: #d1d5db;
        --border-color: #374151;
        --dark: #f3f4f6;
    }

    body {
        background-color: #111827;
    }

    .header,
    .child-profile > div,
    .modal-content,
    .settings-content,
    .profile-container,
    .setup-container {
        background-color: #1f2937;
        color: #f3f4f6;
    }

    input[type="text"],
    input[type="email"],
    select {
        background-color: #374151;
        color: #f3f4f6;
        border-color: #4b5563;
    }

    .child-nav-btn,
    .header-btn,
    .btn-secondary {
        background-color: #374151;
        color: #f3f4f6;
    }

    .setup-item,
    .log-item,
    .settings-item {
        background-color: #374151;
    }

    .info-box {
        background-color: rgba(99, 102, 241, 0.1);
    }
}

/* ============================================
   PRINT STYLES
   ============================================ */

@media print {
    .header,
    .header-nav,
    .btn:not(.btn-primary),
    #settingsBtn,
    #profileBtn,
    #addHabitLogBtn,
    #editAvatarBtn {
        display: none;
    }

    body {
        background: white;
    }

    .child-profile,
    .profile-container,
    .settings-container {
        box-shadow: none;
        border: 1px solid #e5e7eb;
    }
}