/* ============================================================
   Animal Collector Web PWA -- Mobile-first CSS
   ============================================================ */

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

:root {
    --color-primary: #FF69B4;
    --color-primary-dark: #E0559E;
    --color-secondary: #6C757D;
    --color-success: #28A745;
    --color-danger: #DC3545;
    --color-warning: #FFC107;
    --color-bg: #F8F9FA;
    --color-surface: #FFFFFF;
    --color-text: #212529;
    --color-text-muted: #6C757D;
    --color-border: #DEE2E6;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.15);
    --nav-height: 64px;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

html, body {
    height: 100%;
    font-family: var(--font-family);
    font-size: 16px;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

/* --- App Shell --- */
.app-shell {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    min-height: 100dvh;
}

.app-content {
    flex: 1;
    padding-bottom: calc(var(--nav-height) + 16px);
    overflow-y: auto;
}

/* --- Bottom Navigation --- */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: space-around;
    align-items: center;
    z-index: 100;
    box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.08);
    padding-bottom: env(safe-area-inset-bottom, 0);
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    text-decoration: none;
    color: var(--color-text-muted);
    font-size: 0.7rem;
    padding: 4px 12px;
    transition: color 0.2s;
}

.nav-item.active {
    color: var(--color-primary);
}

.nav-icon {
    font-size: 1.5rem;
}

.nav-label {
    font-weight: 500;
}

/* --- Page Container --- */
.page-container {
    padding: 16px;
    max-width: 600px;
    margin: 0 auto;
}

/* --- Cards --- */
.profile-card, .exercise-card, .wanderer-card, .maternity-card,
.battle-lobby, .battle-arena, .battle-result, .login-card {
    background: var(--color-surface);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 16px;
    box-shadow: var(--shadow);
}

/* --- Login Page --- */
.login-page {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    min-height: 100dvh;
    padding: 16px;
}

.login-card {
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.login-title {
    font-size: 2rem;
    color: var(--color-primary);
    margin-bottom: 8px;
}

.login-subtitle {
    color: var(--color-text-muted);
    margin-bottom: 24px;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 12px;
    text-align: left;
}

.login-form label {
    font-weight: 600;
    font-size: 0.875rem;
}

.password-hint {
    margin-top: -4px;
    font-size: 0.75rem;
    color: var(--color-text-muted, #6b7280);
}

/* --- Inputs --- */
input[type="email"], input[type="password"], input[type="text"], input[type="number"] {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    background: var(--color-surface);
    color: var(--color-text);
    transition: border-color 0.2s;
}

input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(255, 105, 180, 0.2);
}

input:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* --- Buttons --- */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
    text-align: center;
}

.btn:active {
    transform: scale(0.97);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--color-primary-dark);
}

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

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

.btn-sm {
    padding: 6px 12px;
    font-size: 0.875rem;
}

/* --- Currency Bar --- */
.currency-bar {
    display: flex;
    gap: 16px;
    padding: 8px 0;
}

.currency-item {
    display: flex;
    align-items: center;
    gap: 4px;
    font-weight: 600;
}

.currency-icon {
    font-size: 1.25rem;
}

/* --- Companion Grid --- */
.companion-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.companion-card {
    background: var(--color-surface);
    border-radius: var(--radius);
    padding: 12px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: transform 0.2s;
}

.companion-card:hover {
    transform: translateY(-2px);
}

.companion-card.shiny {
    border: 2px solid var(--color-warning);
}

.companion-image {
    width: 80px;
    height: 80px;
    object-fit: contain;
    border-radius: 50%;
    background: var(--color-bg);
}

.companion-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
    margin-top: 8px;
}

.companion-name {
    font-weight: 600;
    font-size: 0.875rem;
}

.companion-species {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.companion-level {
    font-size: 0.75rem;
    color: var(--color-primary);
    font-weight: 600;
}

/* --- Loading --- */
.loading-spinner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 40px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.loading-screen {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    min-height: 100dvh;
}

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

.loading-content h1 {
    color: var(--color-primary);
    margin-bottom: 16px;
}

/* --- Status Banners --- */
.error-banner {
    background: #FEE2E2;
    color: #991B1B;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
    font-size: 0.875rem;
}

.info-banner {
    background: #DBEAFE;
    color: #1E40AF;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
    font-size: 0.875rem;
}

.daily-reward-banner {
    background: linear-gradient(135deg, #FFF3CD, #FFF9E6);
    padding: 16px;
    border-radius: var(--radius);
    margin-bottom: 16px;
    text-align: center;
    border: 1px solid var(--color-warning);
}

.empty-state {
    text-align: center;
    padding: 40px 16px;
    color: var(--color-text-muted);
}

/* --- Stats --- */
.stat-row {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.player-code {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-bottom: 8px;
}

/* --- Exercise --- */
.question-display {
    text-align: center;
    padding: 24px;
    margin-bottom: 16px;
}

.question-text {
    font-size: 1.75rem;
    font-weight: 700;
}

.answer-input {
    display: flex;
    gap: 8px;
}

.answer-input input {
    flex: 1;
}

.result-display {
    text-align: center;
    padding: 12px;
    border-radius: var(--radius-sm);
    margin-top: 12px;
    font-weight: 600;
}

.result-display.correct {
    background: #D1FAE5;
    color: #065F46;
}

.result-display.incorrect {
    background: #FEE2E2;
    color: #991B1B;
}

.exercise-stats {
    display: flex;
    justify-content: space-around;
    margin-top: 16px;
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.exercise-start {
    text-align: center;
    padding: 40px;
}

/* --- Shop & Cosmetics --- */
.shop-grid, .cosmetic-grid, .egg-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.shop-item-card, .cosmetic-card, .egg-card {
    background: var(--color-surface);
    border-radius: var(--radius);
    padding: 16px;
    box-shadow: var(--shadow);
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.cosmetic-card.owned {
    border: 2px solid var(--color-success);
}

.item-name, .cosmetic-name {
    font-weight: 600;
    font-size: 0.875rem;
}

.item-price {
    color: var(--color-primary);
    font-weight: 600;
}

.cosmetic-slot {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.egg-visual {
    font-size: 3rem;
}

.egg-progress {
    font-weight: 600;
    color: var(--color-primary);
}

/* --- Social --- */
.social-actions {
    margin-bottom: 16px;
}

.add-friend {
    display: flex;
    gap: 8px;
}

.add-friend input {
    flex: 1;
}

.friends-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.friend-card {
    background: var(--color-surface);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 8px;
}

.friend-name {
    font-weight: 600;
    flex: 1;
}

.friend-code {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.unread-badge {
    background: var(--color-danger);
    color: white;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 2px 6px;
    border-radius: 10px;
    min-width: 20px;
    text-align: center;
}

.messages-panel {
    margin-top: 16px;
    background: var(--color-surface);
    border-radius: var(--radius);
    padding: 16px;
    box-shadow: var(--shadow);
}

.messages-list {
    max-height: 300px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 12px;
}

.message-bubble {
    padding: 8px 12px;
    border-radius: 16px;
    max-width: 80%;
    font-size: 0.875rem;
}

.message-bubble.mine {
    background: var(--color-primary);
    color: white;
    align-self: flex-end;
    border-bottom-right-radius: 4px;
}

.message-bubble.theirs {
    background: var(--color-bg);
    color: var(--color-text);
    align-self: flex-start;
    border-bottom-left-radius: 4px;
}

.message-input {
    display: flex;
    gap: 8px;
}

.message-input input {
    flex: 1;
}

/* --- Breeding --- */
.couples-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.couple-card {
    background: var(--color-surface);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    box-shadow: var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.highlight {
    color: var(--color-primary);
    font-weight: 600;
}

/* ============================================================
   Battle Animations (CSS transform/opacity only -- GPU composited)
   ============================================================ */

/* Card entrance -- slide in from sides */
@keyframes card-entrance-left {
    from { transform: translateX(-100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

@keyframes card-entrance-right {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

.battle-card-entrance {
    animation: card-entrance-left 0.4s ease-out;
}

/* Attack shake */
@keyframes attack-shake {
    0%, 100% { transform: translateX(0); }
    10%, 50%, 90% { transform: translateX(-4px); }
    30%, 70% { transform: translateX(4px); }
}

.battle-hit {
    animation: attack-shake 0.4s ease-in-out;
    color: var(--color-success);
    font-weight: 700;
    font-size: 1.25rem;
    text-align: center;
    padding: 8px;
}

.battle-miss {
    animation: attack-shake 0.3s ease-in-out;
    color: var(--color-danger);
    font-weight: 700;
    font-size: 1.25rem;
    text-align: center;
    padding: 8px;
}

/* Score counter animation */
.battle-score-animate {
    transition: transform 0.3s ease-out;
}

/* Result overlay entrance */
@keyframes result-entrance {
    from { transform: scale(0.8); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.battle-result-entrance {
    animation: result-entrance 0.5s ease-out;
}

/* --- Battle Layout --- */
.battle-scores {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.score-player, .score-opponent {
    text-align: center;
}

.score-label {
    display: block;
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.score-value {
    display: block;
    font-size: 2rem;
    font-weight: 700;
}

.score-vs {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text-muted);
}

.battle-question {
    text-align: center;
    padding: 24px;
    background: var(--color-bg);
    border-radius: var(--radius);
    margin-bottom: 16px;
}

.battle-answer {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}

.battle-answer input {
    flex: 1;
}

.battle-lobby .battle-actions {
    display: flex;
    gap: 8px;
    margin-top: 16px;
}

.battle-lobby .battle-actions input {
    flex: 1;
}

.battle-waiting {
    text-align: center;
}

.battle-select h3 {
    margin-bottom: 12px;
}

.companion-select-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
}

.companion-select-btn {
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 12px;
    cursor: pointer;
    text-align: center;
    transition: border-color 0.2s, transform 0.1s;
}

.companion-select-btn:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

.result-title {
    text-align: center;
    font-size: 1.5rem;
    margin-bottom: 12px;
}

.result-scores {
    display: flex;
    justify-content: space-around;
    margin-bottom: 12px;
    font-size: 1.125rem;
}

.reward {
    text-align: center;
    color: var(--color-warning);
    font-weight: 700;
    font-size: 1.125rem;
    margin-bottom: 12px;
}

/* --- Blazor Error UI --- */
#blazor-error-ui {
    background: var(--color-danger);
    color: white;
    padding: 12px;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    display: none;
    text-align: center;
}

#blazor-error-ui .reload, #blazor-error-ui .dismiss {
    color: white;
    margin-left: 12px;
    text-decoration: underline;
}

/* --- Responsive: Tablet+ --- */
@media (min-width: 768px) {
    .companion-grid, .shop-grid, .cosmetic-grid, .egg-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .companion-select-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* --- Responsive: Very small screens --- */
@media (max-width: 320px) {
    :root {
        --nav-height: 56px;
    }

    .nav-icon {
        font-size: 1.25rem;
    }

    .nav-label {
        font-size: 0.625rem;
    }

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

/* --- Dark mode (respects system preference) --- */
@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: #1A1A2E;
        --color-surface: #16213E;
        --color-text: #E0E0E0;
        --color-text-muted: #A0A0A0;
        --color-border: #2A2A4A;
    }

    input[type="email"], input[type="password"], input[type="text"], input[type="number"] {
        background: var(--color-bg);
        color: var(--color-text);
        border-color: var(--color-border);
    }

    .companion-select-btn {
        background: var(--color-surface);
        border-color: var(--color-border);
        color: var(--color-text);
    }
}

/* --- PWA Install Banner --- */
.pwa-install-banner {
    position: fixed;
    bottom: calc(var(--nav-height) + 8px);
    left: 16px;
    right: 16px;
    background: var(--color-surface);
    padding: 12px 16px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 99;
}

/* --- Offline indicator --- */
.offline-banner {
    background: var(--color-warning);
    color: #000;
    text-align: center;
    padding: 6px;
    font-size: 0.75rem;
    font-weight: 600;
}