/* ============================================================================
   TRULY RESPONSIVE DESIGN SYSTEM - MOBILE FIRST APPROACH
   Built for excellent UX across all device sizes
   ============================================================================ */

/* Base Mobile Styles (320px and up) */
body {
    padding: 0;
}

.container {
    width: 100vw;
    height: 100vh;
    max-width: none;
    max-height: 100vh;
    border-radius: 0;
    margin: 0;
    box-shadow: none;
}

/* Optimized Header for Mobile */
.header {
    padding: 12px 16px 10px 16px;
    min-height: auto;
}

.logo {
    width: 28px;
    height: 28px;
    margin: 0 auto 6px auto;
}

.header h1 {
    font-size: 1.3rem;
    margin: 0 0 4px 0;
    line-height: 1.2;
}

.header .subtitle {
    font-size: 0.8rem;
    margin: 0;
}

/* Status repositioned for mobile */
.status {
    position: fixed;
    bottom: 20px;
    right: 20px;
    top: unset;
    background: rgba(33, 150, 243, 0.95);
    color: white;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.7rem;
    z-index: 1000;
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* Chat container optimized for mobile viewport */
.chat-container {
    flex: 1;
    min-height: 0;
    padding: 0;
}

/* Mobile message layout */
.message.user {
    padding: 16px 16px 8px 60px;
}

.message.user .message-content {
    max-width: 280px;
    padding: 12px 16px;
    font-size: 15px;
    border-radius: 20px;
    border-bottom-right-radius: 6px;
}

.message.assistant {
    padding: 20px 16px;
}

.message.assistant .message-content {
    font-size: 16px;
    line-height: 1.6;
}

/* ACIM quotes responsive */
.message.assistant .message-content .acim-quote {
    padding: 16px 20px;
    margin: 20px 0;
    font-size: 16px;
}

/* Quick actions mobile layout */
.quick-actions {
    padding: 16px;
}

.quick-action-buttons {
    grid-template-columns: 1fr;
    gap: 12px;
}

.quick-action {
    padding: 16px 20px;
    font-size: 0.9rem;
}

/* Input container mobile layout */
.input-container {
    padding: 16px;
    gap: 12px;
    flex-direction: row;
}

.message-input {
    flex: 1;
    padding: 12px 16px;
    font-size: 16px; /* Prevents zoom on iOS */
}

.send-button {
    padding: 12px 20px;
    min-width: 80px;
    font-size: 0.9rem;
}

/* ============================================================================
   SMALL MOBILE (up to 375px)
   ============================================================================ */
@media (max-width: 375px) {
    .header {
        padding: 10px 12px 8px 12px;
    }
    
    .header h1 {
        font-size: 1.2rem;
    }
    
    .message.user {
        padding: 12px 12px 6px 40px;
    }
    
    .message.user .message-content {
        max-width: 240px;
        padding: 10px 14px;
        font-size: 14px;
    }
    
    .message.assistant {
        padding: 16px 12px;
    }
    
    .input-container {
        padding: 12px;
        flex-direction: column;
        gap: 10px;
    }
    
    .send-button {
        width: 100%;
    }
}

/* ============================================================================
   PHABLET / LARGE MOBILE (376px - 480px)
   ============================================================================ */
@media (min-width: 376px) and (max-width: 480px) {
    .header h1 {
        font-size: 1.4rem;
    }
    
    .message.user .message-content {
        max-width: 300px;
    }
    
    .quick-action-buttons {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ============================================================================
   SMALL TABLET / LARGE PHABLET (481px - 768px)
   ============================================================================ */
@media (min-width: 481px) and (max-width: 768px) {
    .container {
        border-radius: 8px;
        margin: 8px;
        width: calc(100vw - 16px);
        height: calc(100vh - 16px);
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    }
    
    .header {
        padding: 16px 24px 12px 24px;
    }
    
    .logo {
        width: 36px;
        height: 36px;
        margin: 0 auto 8px auto;
    }
    
    .header h1 {
        font-size: 1.5rem;
        margin: 0 0 6px 0;
    }
    
    .header .subtitle {
        font-size: 0.85rem;
    }
    
    .message.user {
        padding: 18px 24px 10px 80px;
    }
    
    .message.user .message-content {
        max-width: 350px;
        padding: 14px 18px;
        font-size: 15px;
    }
    
    .message.assistant {
        padding: 24px;
    }
    
    .quick-action-buttons {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
    
    .input-container {
        padding: 20px;
    }
}

/* ============================================================================
   TABLET PORTRAIT (769px - 1024px)
   ============================================================================ */
@media (min-width: 769px) and (max-width: 1024px) {
    .container {
        max-width: 800px;
        margin: 16px auto;
        height: calc(100vh - 32px);
        border-radius: 12px;
        box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
    }
    
    .header {
        padding: 20px 32px 16px 32px;
    }
    
    .logo {
        width: 40px;
        height: 40px;
        margin: 0 auto 10px auto;
    }
    
    .header h1 {
        font-size: 1.6rem;
        margin: 0 0 6px 0;
    }
    
    .header .subtitle {
        font-size: 0.9rem;
    }
    
    .status {
        position: absolute;
        top: 16px;
        right: 24px;
        bottom: unset;
        background: rgba(209, 236, 241, 0.9);
        color: #0C5460;
        border: 1px solid rgba(12, 84, 96, 0.2);
    }
    
    .message.user {
        padding: 20px 32px 12px 120px;
    }
    
    .message.user .message-content {
        max-width: 400px;
        padding: 16px 20px;
        font-size: 16px;
    }
    
    .message.assistant {
        padding: 28px 32px;
    }
    
    .quick-action-buttons {
        grid-template-columns: repeat(2, 1fr);
        gap: 18px;
    }
}

/* ============================================================================
   SMALL LAPTOP (1025px - 1366px)
   ============================================================================ */
@media (min-width: 1025px) and (max-width: 1366px) {
    body {
        padding: 8px;
    }
    
    .container {
        max-width: 900px;
        height: calc(100vh - 16px);
        border-radius: 16px;
    }
    
    .header {
        padding: 20px 32px 16px 32px;
    }
    
    .logo {
        width: 42px;
        height: 42px;
        margin: 0 auto 10px auto;
    }
    
    .header h1 {
        font-size: 1.7rem;
    }
    
    .status {
        position: absolute;
        top: 12px;
        right: 20px;
        font-size: 0.75rem;
    }
    
    .quick-action-buttons {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }
}

/* ============================================================================
   LARGE LAPTOP/DESKTOP (1367px and up)
   ============================================================================ */
@media (min-width: 1367px) {
    body {
        padding: 16px;
    }
    
    .container {
        max-width: 1000px;
        height: calc(100vh - 32px);
    }
    
    .header {
        padding: 24px 32px 20px 32px;
    }
    
    .logo {
        width: 48px;
        height: 48px;
        margin: 0 auto 12px auto;
    }
    
    .header h1 {
        font-size: 1.8rem;
        margin: 0 0 6px 0;
    }
    
    .header .subtitle {
        font-size: 0.9rem;
    }
    
    .quick-action-buttons {
        grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    }
}

/* ============================================================================
   ULTRA-WIDE SCREENS (1920px and up)
   ============================================================================ */
@media (min-width: 1920px) {
    .container {
        max-width: 1200px;
    }
    
    .message.assistant {
        padding: 32px 48px;
    }
    
    .message.assistant .message-content {
        font-size: 18px;
        line-height: 1.8;
    }
}

/* ============================================================================
   LANDSCAPE MOBILE OPTIMIZATIONS
   ============================================================================ */
@media (max-height: 500px) and (orientation: landscape) {
    .header {
        padding: 8px 16px 6px 16px;
    }
    
    .logo {
        width: 24px;
        height: 24px;
        margin: 0 auto 4px auto;
    }
    
    .header h1 {
        font-size: 1.1rem;
        margin: 0 0 2px 0;
    }
    
    .header .subtitle {
        font-size: 0.75rem;
    }
    
    .quick-actions {
        padding: 12px 16px;
    }
    
    .quick-action-buttons {
        grid-template-columns: repeat(4, 1fr);
        gap: 8px;
    }
    
    .quick-action {
        padding: 8px 12px;
        font-size: 0.8rem;
    }
    
    .input-container {
        padding: 12px 16px;
    }
    
    .message.assistant {
        padding: 16px;
    }
}

/* ============================================================================
   TOUCH DEVICE OPTIMIZATIONS
   ============================================================================ */
@media (hover: none) and (pointer: coarse) {
    .quick-action {
        min-height: 44px; /* iOS accessibility guideline */
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    .send-button {
        min-height: 44px;
    }
    
    .message-input {
        min-height: 44px;
    }
}

/* ============================================================================
   HIGH DPI / RETINA DISPLAY OPTIMIZATIONS
   ============================================================================ */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .logo {
        image-rendering: -webkit-optimize-contrast;
        image-rendering: crisp-edges;
    }
    
    .container {
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08), 0 1px 4px rgba(0, 0, 0, 0.12);
    }
}

/* ============================================================================
   FLUID TYPOGRAPHY SYSTEM
   For ultra-responsive text scaling across all viewports
   ============================================================================ */
:root {
    /* Fluid typography variables */
    --fluid-min-width: 320;
    --fluid-max-width: 1920;
    --fluid-min-size: 14;
    --fluid-max-size: 18;
    --fluid-min-header: 18;
    --fluid-max-header: 28;
}

@media screen and (min-width: 320px) {
    html {
        font-size: calc(var(--fluid-min-size) * 1px);
    }
    
    .header h1 {
        font-size: calc(var(--fluid-min-header) * 1px);
    }
}

@media screen and (min-width: 1920px) {
    html {
        font-size: calc(var(--fluid-max-size) * 1px);
    }
    
    .header h1 {
        font-size: calc(var(--fluid-max-header) * 1px);
    }
}

@media screen and (min-width: 320px) and (max-width: 1920px) {
    html {
        font-size: calc(var(--fluid-min-size) * 1px + (var(--fluid-max-size) - var(--fluid-min-size)) * (100vw - var(--fluid-min-width) * 1px) / (var(--fluid-max-width) - var(--fluid-min-width)));
    }
    
    .header h1 {
        font-size: calc(var(--fluid-min-header) * 1px + (var(--fluid-max-header) - var(--fluid-min-header)) * (100vw - var(--fluid-min-width) * 1px) / (var(--fluid-max-width) - var(--fluid-min-width)));
    }
}

/* ============================================================================
   SPECIAL RESPONSIVE ENHANCEMENTS
   ============================================================================ */

/* Viewport height considerations for mobile browsers (addressing the 100vh issue) */
@supports (-webkit-touch-callout: none) {
    /* iOS specific fix for 100vh issue */
    .container {
        height: -webkit-fill-available;
        max-height: -webkit-fill-available;
    }
}

/* Better position sticky support for Safari */
.header {
    position: sticky;
    top: 0;
    z-index: 10;
    background: white;
}

/* Improved overflow scrolling on iOS */
.chat-container {
    -webkit-overflow-scrolling: touch;
}