/**
 * QuocNho LMS - PWA & Mobile Experience Stylesheet
 * Synchronized with Flutter fusers (AppTheme & Design Tokens)
 */

:root {
    --pwa-primary: #004F44;
    --pwa-primary-dark: #1A3A36;
    --pwa-splash-bg: #E7F1F6;
    --pwa-mint-100: #E6F3F0;
    --pwa-mint-200: #CCE7E1;
    --pwa-mint-300: #B3DBD2;
    --pwa-mint-400: #99CFC3;
    --pwa-orange: #F19B50;
    --pwa-blue: #4C87EE;
    --pwa-gray-150: #FBFCFC;
    --pwa-card-bg: #FFFFFF;
    --pwa-text: #004F44;
    --pwa-text-muted: #64748b;
    --pwa-shadow: 0 10px 25px -5px rgba(0, 79, 68, 0.12), 0 8px 10px -6px rgba(0, 79, 68, 0.08);
    --pwa-radius-lg: 24px;
    --pwa-radius-md: 16px;
    --pwa-radius-sm: 10px;
    --pwa-bottom-bar-height: 68px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --pwa-primary: #1A3A36;
        --pwa-splash-bg: #0E1616;
        --pwa-card-bg: #16201F;
        --pwa-mint-100: #14423C;
        --pwa-mint-200: #1E5A52;
        --pwa-mint-300: #267064;
        --pwa-mint-400: #2E8777;
        --pwa-text: #E6F3F0;
        --pwa-text-muted: #94a3b8;
        --pwa-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.4);
    }
}

/* Base Body Padding on Mobile to avoid Bottom Bar overlap */
@media (max-width: 991px) {
    body {
        padding-bottom: calc(var(--pwa-bottom-bar-height) + env(safe-area-inset-bottom, 16px)) !important;
    }
}

/* ==========================================================================
   1. FLOATING BOTTOM NAVIGATION BAR (Matching Flutter AppBottomNavBar)
   ========================================================================== */
.pwa-bottom-bar {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 1040;
    background: var(--pwa-card-bg);
    border-top: 1px solid var(--pwa-mint-200);
    box-shadow: 0 -8px 24px rgba(0, 79, 68, 0.09);
    padding: 8px 12px calc(8px + env(safe-area-inset-bottom, 8px)) 12px;
    border-radius: 24px 24px 0 0;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

@media (max-width: 991px) {
    .pwa-bottom-bar {
        display: flex;
        justify-content: space-around;
        align-items: center;
    }
}

.pwa-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    color: var(--pwa-text-muted);
    font-size: 11px;
    font-weight: 500;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    padding: 4px 8px;
    border-radius: var(--pwa-radius-sm);
    min-width: 58px;
}

.pwa-nav-item i {
    font-size: 18px;
    margin-bottom: 3px;
    transition: transform 0.2s ease, color 0.2s ease;
}

.pwa-nav-item.active {
    color: var(--pwa-primary);
    font-weight: 700;
}

.pwa-nav-item.active i {
    transform: scale(1.12);
    color: var(--pwa-primary);
}

.pwa-nav-item.active::before {
    content: '';
    position: absolute;
    top: -8px;
    width: 24px;
    height: 3px;
    background: var(--pwa-primary);
    border-radius: 4px;
}

.pwa-nav-badge {
    position: absolute;
    top: 0;
    right: 10px;
    background: #ef4444;
    color: white;
    font-size: 10px;
    font-weight: 700;
    padding: 1px 5px;
    border-radius: 10px;
    min-width: 16px;
    height: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Center Highlight Button for AI Tutor / Classroom */
.pwa-nav-item.pwa-nav-center {
    position: relative;
    top: -14px;
}

.pwa-nav-center-btn {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, #004F44, #2E8777);
    color: #FFFFFF !important;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 6px 16px rgba(0, 79, 68, 0.35);
    border: 3px solid var(--pwa-card-bg);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.pwa-nav-center-btn:active {
    transform: scale(0.92);
}

.pwa-nav-center-btn i {
    font-size: 20px;
    margin: 0;
    color: #FFFFFF;
}

/* ==========================================================================
   2. PWA INSTALL BANNER & MOBILE BOTTOM SHEET
   ========================================================================== */
.pwa-install-banner {
    display: none;
    position: fixed;
    bottom: calc(var(--pwa-bottom-bar-height) + 12px + env(safe-area-inset-bottom, 8px));
    left: 12px;
    right: 12px;
    max-width: 440px;
    margin: 0 auto;
    z-index: 1060;
    background: var(--pwa-card-bg);
    border-radius: var(--pwa-radius-lg);
    box-shadow: 0 20px 45px rgba(0, 79, 68, 0.22), 0 4px 12px rgba(0, 0, 0, 0.08);
    border: 1px solid var(--pwa-mint-300);
    padding: 20px 18px;
    animation: pwaSlideUp 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

@media (min-width: 992px) {
    .pwa-install-banner {
        bottom: 24px;
        right: 24px;
        left: auto;
    }
}

.btn-pwa-close {
    position: absolute;
    top: 12px;
    right: 12px;
    background: var(--pwa-mint-100);
    border: none;
    color: var(--pwa-text-muted);
    font-size: 14px;
    width: 28px;
    height: 28px;
    cursor: pointer;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.btn-pwa-close:hover {
    background: #e2e8f0;
    color: #0f172a;
}

.pwa-sheet-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 16px;
    padding-right: 24px;
}

.pwa-install-icon {
    width: 52px;
    height: 52px;
    border-radius: 14px;
    background: var(--pwa-mint-100);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    overflow: hidden;
    box-shadow: 0 4px 10px rgba(0, 79, 68, 0.15);
    border: 1px solid var(--pwa-mint-200);
}

.pwa-install-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.pwa-badge-app {
    display: inline-block;
    background: rgba(0, 79, 68, 0.1);
    color: var(--pwa-primary);
    font-size: 10px;
    font-weight: 800;
    letter-spacing: 0.5px;
    padding: 2px 8px;
    border-radius: 6px;
    margin-bottom: 4px;
}

.pwa-app-title {
    font-size: 16px;
    font-weight: 800;
    margin: 0 0 2px 0;
    color: var(--pwa-primary);
    line-height: 1.2;
}

.pwa-app-subtitle {
    font-size: 12px;
    color: var(--pwa-text-muted);
    margin: 0;
    line-height: 1.3;
}

/* Features Grid */
.pwa-features-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 18px;
    padding: 12px;
    background: var(--pwa-mint-100);
    border-radius: var(--pwa-radius-md);
    border: 1px solid var(--pwa-mint-200);
}

@media (max-width: 480px) {
    .pwa-features-grid {
        grid-template-columns: 1fr;
        gap: 8px;
    }
}

.pwa-feat-item {
    display: flex;
    align-items: flex-start;
    gap: 8px;
}

.pwa-feat-icon {
    width: 26px;
    height: 26px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 11px;
}

.bg-mint { background: #d1fae5; color: #059669; }
.bg-orange { background: #ffedd5; color: #ea580c; }
.bg-blue { background: #dbeafe; color: #2563eb; }
.bg-purple { background: #f3e8ff; color: #9333ea; }

.text-primary-custom { color: #004F44; }
.text-orange { color: #ea580c; }
.text-blue { color: #2563eb; }
.text-purple { color: #9333ea; }

.pwa-feat-text {
    display: flex;
    flex-direction: column;
}

.pwa-feat-text strong {
    font-size: 11px;
    color: var(--pwa-primary);
    line-height: 1.3;
}

.pwa-feat-text span {
    font-size: 10px;
    color: var(--pwa-text-muted);
    line-height: 1.25;
}

/* Action Buttons */
.pwa-sheet-actions {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.btn-pwa-install-main {
    width: 100%;
    padding: 12px 18px;
    background: linear-gradient(135deg, #004F44, #1B7A6B);
    color: #FFFFFF;
    font-size: 14px;
    font-weight: 700;
    border: none;
    border-radius: 14px;
    cursor: pointer;
    box-shadow: 0 6px 16px rgba(0, 79, 68, 0.3);
    transition: all 0.25s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-pwa-install-main:hover {
    background: linear-gradient(135deg, #003a32, #145e52);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 79, 68, 0.4);
}

.btn-pwa-install-main:active {
    transform: translateY(0);
}

.btn-pwa-dismiss {
    background: transparent;
    border: none;
    color: var(--pwa-text-muted);
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    padding: 6px;
    text-align: center;
    transition: color 0.2s;
}

.btn-pwa-dismiss:hover {
    color: var(--pwa-primary);
    text-decoration: underline;
}

/* iOS Native Add-to-Home-Screen Guide Modal */
.pwa-ios-guide-card {
    max-width: 400px;
    text-align: left;
    position: relative;
    padding: 24px 22px;
}

.pwa-ios-app-icon {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    overflow: hidden;
    flex-shrink: 0;
    box-shadow: 0 4px 8px rgba(0, 79, 68, 0.2);
}

.pwa-ios-app-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.pwa-ios-steps {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin: 16px 0;
}

.pwa-ios-step {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    background: var(--pwa-mint-100);
    padding: 11px 14px;
    border-radius: 14px;
    border: 1px solid var(--pwa-mint-200);
    transition: transform 0.2s;
}

.step-num {
    width: 24px;
    height: 24px;
    background: var(--pwa-primary);
    color: #FFFFFF;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 800;
    flex-shrink: 0;
}

.step-desc {
    font-size: 12.5px;
    color: var(--pwa-text);
    line-height: 1.45;
}

.pwa-icon-highlight {
    background: var(--pwa-mint-200);
    padding: 2px 6px;
    border-radius: 6px;
    display: inline-block;
    font-size: 13px;
}

/* Floating Bouncing Pointer at bottom */
.pwa-ios-bottom-pointer {
    display: flex;
    justify-content: center;
    margin: 14px 0 6px 0;
}

.pwa-pointer-badge {
    background: rgba(0, 79, 68, 0.08);
    color: var(--pwa-primary);
    font-size: 11.5px;
    font-weight: 700;
    padding: 6px 14px;
    border-radius: 20px;
    border: 1px dashed var(--pwa-primary);
    display: flex;
    align-items: center;
    animation: pwaBounceBadge 1.8s infinite ease-in-out;
}

@keyframes pwaBounceBadge {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(5px); }
}

/* ==========================================================================
   3. FLOATING TOOLS (POMODORO TIMER & AI TUTOR DRAWER)
   ========================================================================== */
.pwa-fab-container {
    position: fixed;
    right: 16px;
    bottom: calc(var(--pwa-bottom-bar-height) + 16px);
    z-index: 1030;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

@media (min-width: 992px) {
    .pwa-fab-container {
        bottom: 28px;
        right: 28px;
    }
}

.pwa-fab-btn {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.pwa-fab-btn:hover {
    transform: translateY(-3px) scale(1.05);
}

.pwa-fab-btn:active {
    transform: translateY(0) scale(0.95);
}

.pwa-fab-pomodoro {
    background: linear-gradient(135deg, #F19B50, #E06D28);
    color: #FFFFFF;
}

.pwa-fab-ai {
    background: linear-gradient(135deg, #004F44, #2E8777);
    color: #FFFFFF;
}

.pwa-fab-tooltip {
    position: absolute;
    right: 56px;
    background: rgba(0, 79, 68, 0.95);
    color: #FFFFFF;
    font-size: 11px;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 8px;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
}

.pwa-fab-btn:hover .pwa-fab-tooltip {
    opacity: 1;
}

/* ==========================================================================
   4. MODAL POMODORO STUDY TIMER (Matching fusers PomodoroTimerScreen)
   ========================================================================== */
.pwa-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(6px);
    z-index: 1090;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    padding: 16px;
}

.pwa-modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.pwa-pomodoro-card {
    background: var(--pwa-card-bg);
    border-radius: 28px;
    padding: 28px;
    max-width: 380px;
    width: 100%;
    text-align: center;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    border: 1px solid var(--pwa-mint-200);
    transform: scale(0.9);
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.pwa-modal-overlay.active .pwa-pomodoro-card {
    transform: scale(1);
}

.pwa-timer-display {
    font-family: 'Montserrat', monospace;
    font-size: 48px;
    font-weight: 800;
    color: var(--pwa-primary);
    margin: 20px 0;
    letter-spacing: 2px;
}

.pwa-timer-modes {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 16px;
}

.pwa-mode-chip {
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    border: 1px solid var(--pwa-mint-300);
    background: var(--pwa-mint-100);
    color: var(--pwa-primary);
    cursor: pointer;
    transition: all 0.2s;
}

.pwa-mode-chip.active {
    background: var(--pwa-primary);
    color: #FFFFFF;
    border-color: var(--pwa-primary);
}

.pwa-timer-controls {
    display: flex;
    justify-content: center;
    gap: 12px;
}

.pwa-timer-btn {
    padding: 12px 24px;
    border-radius: 14px;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
}

.pwa-btn-start {
    background: var(--pwa-primary);
    color: #FFFFFF;
    box-shadow: 0 6px 16px rgba(0, 79, 68, 0.25);
}

.pwa-btn-reset {
    background: var(--pwa-mint-100);
    color: var(--pwa-primary);
}

/* ==========================================================================
   5. AI TUTOR FLOATING DRAWER (Connected to /api/ai-chat)
   ========================================================================== */
.pwa-ai-drawer {
    position: fixed;
    bottom: 0;
    right: 0;
    width: 100%;
    max-width: 420px;
    height: 85vh;
    max-height: 640px;
    background: var(--pwa-card-bg);
    border-radius: 24px 24px 0 0;
    box-shadow: 0 -10px 40px rgba(0, 79, 68, 0.15);
    border: 1px solid var(--pwa-mint-200);
    z-index: 1080;
    display: flex;
    flex-direction: column;
    transform: translateY(105%);
    transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

.pwa-ai-drawer.active {
    transform: translateY(0);
}

.pwa-ai-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--pwa-mint-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--pwa-mint-100);
    border-radius: 24px 24px 0 0;
}

.pwa-ai-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 15px;
    color: var(--pwa-primary);
}

.pwa-ai-messages {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.pwa-ai-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 8px;
}

.pwa-ai-chip {
    background: #FFFFFF;
    border: 1px solid var(--pwa-mint-300);
    color: var(--pwa-primary);
    font-size: 11px;
    font-weight: 600;
    padding: 5px 10px;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 2px 4px rgba(0, 79, 68, 0.05);
}

.pwa-ai-chip:hover {
    background: var(--pwa-primary);
    color: #FFFFFF;
    border-color: var(--pwa-primary);
}

.pwa-ai-msg {
    max-width: 85%;
    padding: 12px 16px;
    border-radius: 18px;
    font-size: 13.5px;
    line-height: 1.55;
    position: relative;
    word-break: break-word;
}

.pwa-ai-msg.bot {
    align-self: flex-start;
    background: var(--pwa-mint-100);
    color: #1a3a36;
    border-bottom-left-radius: 4px;
    border: 1px solid var(--pwa-mint-200);
}

.pwa-ai-msg.user {
    align-self: flex-end;
    background: linear-gradient(135deg, #004F44, #1B7A6B);
    color: #FFFFFF;
    border-bottom-right-radius: 4px;
}

.pwa-ai-msg p {
    margin-bottom: 8px;
}

.pwa-ai-msg p:last-child {
    margin-bottom: 0;
}

.pwa-ai-msg ul, .pwa-ai-msg ol {
    padding-left: 18px;
    margin-bottom: 8px;
}

.pwa-ai-msg code {
    background: rgba(0, 79, 68, 0.12);
    color: var(--pwa-primary);
    padding: 2px 5px;
    border-radius: 4px;
    font-family: monospace;
    font-size: 12px;
}

.pwa-ai-msg.user code {
    background: rgba(255, 255, 255, 0.25);
    color: #FFFFFF;
}

.pwa-ai-msg pre {
    background: #1e293b;
    color: #f8fafc;
    padding: 10px 12px;
    border-radius: 10px;
    overflow-x: auto;
    font-size: 12px;
    margin: 8px 0;
}

.pwa-ai-msg pre code {
    background: transparent;
    color: inherit;
    padding: 0;
}

.pwa-copy-btn {
    position: absolute;
    bottom: -8px;
    right: 8px;
    background: #FFFFFF;
    border: 1px solid var(--pwa-mint-300);
    color: var(--pwa-text-muted);
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 8px;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.2s, background 0.2s;
}

.pwa-ai-msg:hover .pwa-copy-btn {
    opacity: 1;
}

.pwa-copy-btn:hover {
    background: var(--pwa-mint-100);
    color: var(--pwa-primary);
}

.pwa-typing-indicator {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 4px 0;
}

.pwa-typing-indicator span {
    width: 6px;
    height: 6px;
    background: var(--pwa-primary);
    border-radius: 50%;
    animation: pwaDotPulse 1.4s infinite ease-in-out both;
}

.pwa-typing-indicator span:nth-child(1) { animation-delay: -0.32s; }
.pwa-typing-indicator span:nth-child(2) { animation-delay: -0.16s; }

@keyframes pwaDotPulse {
    0%, 80%, 100% { transform: scale(0.6); opacity: 0.4; }
    40% { transform: scale(1.1); opacity: 1; }
}

.pwa-ai-input-bar {
    padding: 12px 16px;
    border-top: 1px solid var(--pwa-mint-200);
    display: flex;
    gap: 8px;
    background: var(--pwa-card-bg);
}

.pwa-ai-input {
    flex: 1;
    border: 1px solid var(--pwa-mint-300);
    border-radius: 20px;
    padding: 10px 16px;
    font-size: 13px;
    outline: none;
    background: var(--pwa-mint-100);
    color: var(--pwa-text);
}

.pwa-ai-send-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--pwa-primary);
    color: #FFFFFF;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: transform 0.15s, background 0.2s;
}

.pwa-ai-send-btn:hover {
    background: #003a32;
    transform: scale(1.05);
}

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

/* ==========================================================================
   7. PWA TOAST NOTIFICATION & REALTIME INSTALL FEEDBACK
   ========================================================================== */
.pwa-toast {
    position: fixed;
    top: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(-30px);
    background: #004F44;
    color: #FFFFFF;
    padding: 14px 20px;
    border-radius: 16px;
    box-shadow: 0 16px 36px rgba(0, 79, 68, 0.35), 0 4px 12px rgba(0, 0, 0, 0.12);
    z-index: 1100;
    max-width: 90%;
    width: 360px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 13px;
    line-height: 1.4;
    opacity: 0;
    pointer-events: none;
    transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.pwa-toast.active {
    opacity: 1;
    pointer-events: auto;
    transform: translateX(-50%) translateY(0);
}

.pwa-toast.toast-success {
    background: linear-gradient(135deg, #004F44, #1B7A6B);
}

.pwa-toast.toast-info {
    background: linear-gradient(135deg, #0F172A, #1E293B);
}

.pwa-toast-icon {
    font-size: 20px;
    flex-shrink: 0;
}

.pwa-toast-body {
    flex: 1;
}

.pwa-toast-body strong {
    display: block;
    font-size: 14px;
    margin-bottom: 2px;
}