/* ============================================
   Artemis 1 PWA - Mobile-First Styles
   Optimized for iPhone 12 Pro+ (390x844)
   ============================================ */

/* ============================================
   CSS Variables & Theme
   ============================================ */
:root {
    /* Brand Colors */
    --color-magenta: #C14D81;
    --color-teal: #4BACC6;
    --color-teal-dark: #3a8a9f;
    --color-navy: #1F497D;
    --color-orange: #F7941E;
    --color-red: #ef4444;
    
    /* Light Theme */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #94a3b8;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    
    /* Layout */
    --header-height: 60px;
    --input-height: 80px;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-tertiary: #64748b;
    --border-color: #334155;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    font-size: var(--font-size-base);
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    overflow: hidden;
    /* iOS specific */
    -webkit-tap-highlight-color: transparent;
    -webkit-touch-callout: none;
}

/* ============================================
   App Layout
   ============================================ */
.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    height: 100dvh; /* Dynamic viewport height for mobile */
    max-width: 100vw;
    overflow: hidden;
}

/* ============================================
   Header
   ============================================ */
.app-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: linear-gradient(135deg, var(--color-navy) 0%, var(--color-teal) 100%);
    color: white;
    box-shadow: var(--shadow-md);
    /* iOS safe area */
    padding-top: env(safe-area-inset-top);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    padding: 0 var(--spacing-md);
}

.app-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin: 0;
}

.app-icon {
    font-size: var(--font-size-2xl);
}

.icon-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: none;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border-radius: 50%;
    cursor: pointer;
    transition: background var(--transition-fast);
    -webkit-tap-highlight-color: transparent;
}

.icon-btn:hover,
.icon-btn:active {
    background: rgba(255, 255, 255, 0.2);
}

/* ============================================
   Chat Container
   ============================================ */
.chat-container {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: var(--spacing-md);
    background-color: var(--bg-secondary);
    /* iOS momentum scrolling */
    -webkit-overflow-scrolling: touch;
    /* Safe area for iOS */
    padding-bottom: calc(var(--spacing-md) + env(safe-area-inset-bottom));
}

/* ============================================
   Welcome Message
   ============================================ */
.welcome-message {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-xl);
    margin-top: 20vh;
}

.welcome-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-lg);
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.welcome-message h2 {
    font-size: var(--font-size-2xl);
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.welcome-message p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.welcome-hint {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}

/* ============================================
   Messages
   ============================================ */
.messages-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.message {
    display: flex;
    gap: var(--spacing-sm);
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message.user {
    flex-direction: row-reverse;
}

.message-avatar {
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-lg);
    background: var(--color-navy);
    color: white;
}

.message.user .message-avatar {
    background: var(--color-magenta);
}

.message-content {
    flex: 1;
    max-width: 80%;
}

.message-bubble {
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    background: var(--bg-primary);
    box-shadow: var(--shadow-sm);
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.message.user .message-bubble {
    background: var(--color-magenta);
    color: white;
}

.message-text {
    margin: 0;
    line-height: 1.5;
}

.message-time {
    display: block;
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
    margin-top: var(--spacing-xs);
}

.message.user .message-time {
    text-align: right;
    color: rgba(255, 255, 255, 0.7);
}

/* ============================================
   Widgets
   ============================================ */
.widget {
    margin-top: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--border-color);
}

/* Gauge Widget */
.widget-gauge {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.gauge-container {
    position: relative;
    width: 120px;
    height: 120px;
}

.gauge-svg {
    transform: rotate(-90deg);
}

.gauge-bg {
    fill: none;
    stroke: var(--border-color);
    stroke-width: 10;
}

.gauge-fill {
    fill: none;
    stroke-width: 10;
    stroke-linecap: round;
    transition: stroke-dashoffset 1s ease;
}

.gauge-fill.teal { stroke: var(--color-teal); }
.gauge-fill.orange { stroke: var(--color-orange); }
.gauge-fill.red { stroke: var(--color-red); }
.gauge-fill.navy { stroke: var(--color-navy); }
.gauge-fill.magenta { stroke: var(--color-magenta); }

.gauge-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--text-primary);
}

.gauge-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    text-align: center;
}

/* List Widget */
.widget-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.list-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--bg-primary);
    border-radius: var(--border-radius-sm);
}

.list-item-icon {
    font-size: var(--font-size-lg);
}

.list-item-text {
    flex: 1;
    font-size: var(--font-size-sm);
    color: var(--text-primary);
}

/* Status Card Widget */
.widget-status-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.status-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    flex-shrink: 0;
}

.status-indicator.success { background: #10b981; }
.status-indicator.warning { background: var(--color-orange); }
.status-indicator.error { background: var(--color-red); }
.status-indicator.info { background: var(--color-teal); }

.status-content {
    flex: 1;
}

.status-title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.status-detail {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

/* ============================================
   Typing Indicator
   ============================================ */
.typing-indicator {
    display: flex;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
    margin-left: 44px;
}

.typing-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-navy);
    animation: typing 1.4s infinite;
}

.typing-dot:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-dot:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typing {
    0%, 60%, 100% {
        opacity: 0.3;
        transform: scale(0.8);
    }
    30% {
        opacity: 1;
        transform: scale(1);
    }
}

/* ============================================
   Input Area
   ============================================ */
.input-area {
    position: sticky;
    bottom: 0;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.05);
    /* iOS safe area */
    padding-bottom: env(safe-area-inset-bottom);
}

.message-form {
    display: flex;
    align-items: flex-end;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
}

.message-input {
    flex: 1;
    min-height: 44px;
    max-height: 120px;
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: var(--font-size-base);
    resize: none;
    overflow-y: auto;
    transition: border-color var(--transition-fast);
}

.message-input:focus {
    outline: none;
    border-color: var(--color-navy);
}

.message-input::placeholder {
    color: var(--text-tertiary);
}

.send-btn {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    border-radius: 50%;
    background: var(--color-navy);
    color: white;
    cursor: pointer;
    transition: all var(--transition-fast);
    -webkit-tap-highlight-color: transparent;
}

.send-btn:hover,
.send-btn:active {
    background: var(--color-magenta);
    transform: scale(0.95);
}

.send-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ============================================
   Modal
   ============================================ */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: flex-end;
    animation: fadeIn 0.3s ease;
}

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

.modal-content {
    width: 100%;
    max-height: 90vh;
    background: var(--bg-primary);
    border-radius: var(--border-radius) var(--border-radius) 0 0;
    overflow-y: auto;
    animation: slideUp 0.3s ease;
    /* iOS safe area */
    padding-bottom: env(safe-area-inset-bottom);
}

@keyframes slideUp {
    from { transform: translateY(100%); }
    to { transform: translateY(0); }
}

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

.modal-header h2 {
    font-size: var(--font-size-xl);
    color: var(--text-primary);
}

.modal-body {
    padding: var(--spacing-lg);
}

/* ============================================
   Settings
   ============================================ */
.settings-section {
    margin-bottom: var(--spacing-xl);
}

.settings-section h3 {
    font-size: var(--font-size-lg);
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.form-input {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: var(--font-size-base);
    transition: border-color var(--transition-fast);
}

.form-input:focus {
    outline: none;
    border-color: var(--color-navy);
}

.toggle-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
}

.toggle-label input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.session-info {
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--border-radius-sm);
    margin-bottom: var(--spacing-md);
}

.session-info p {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.session-info strong {
    color: var(--text-primary);
}

.about-text {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    width: 100%;
    padding: var(--spacing-md);
    border: none;
    border-radius: var(--border-radius-sm);
    font-family: var(--font-sans);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    -webkit-tap-highlight-color: transparent;
}

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

.btn-primary:hover,
.btn-primary:active {
    background: var(--color-magenta);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover,
.btn-secondary:active {
    background: var(--bg-secondary);
}

/* ============================================
   Toast Notifications
   ============================================ */
.toast {
    position: fixed;
    bottom: calc(var(--input-height) + var(--spacing-md));
    left: var(--spacing-md);
    right: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-sm);
    color: white;
    font-size: var(--font-size-sm);
    box-shadow: var(--shadow-lg);
    animation: slideUp 0.3s ease;
    z-index: 999;
}

.toast-error {
    background: var(--color-red);
}

.toast-success {
    background: #10b981;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (min-width: 768px) {
    .app-container {
        max-width: 768px;
        margin: 0 auto;
        border-left: 1px solid var(--border-color);
        border-right: 1px solid var(--border-color);
    }
    
    .message-content {
        max-width: 70%;
    }
    
    .modal-content {
        max-width: 600px;
        margin: auto;
        border-radius: var(--border-radius);
    }
}

/* ============================================
   Utility Classes
   ============================================ */
.hidden {
    display: none !important;
}

.loading {
    opacity: 0.6;
    pointer-events: none;
}

/* ============================================
   Scrollbar Styling
   ============================================ */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}