/**
 * layout.css - Global Shared Styles
 *
 * PURPOSE:
 * This file contains styles that are used across MULTIPLE pages in the application.
 * Only define classes here if they are reused in 2+ pages.
 *
 * BEFORE ADDING NEW STYLES:
 * 1. Search this file first for existing similar styles
 * 2. Check if the style is page-specific (chat.css, email-client.css)
 * 3. If used in only ONE page, put it in that page's CSS file instead
 *
 * ORGANIZATION:
 * - Global resets and base styles
 * - Shared UI components (used across pages)
 * - Shared animations and keyframes
 * - Shared utility classes
 *
 * @author William Callahan
 * @since 2025-11-02
 */

/* ============================================================================
   GLOBAL RESETS & BASE STYLES
   ============================================================================ */

/**
 * Box-sizing: Ensure all elements use border-box model
 * Used by: All pages
 */
* {
    box-sizing: border-box;
}

/**
 * Body: Base typography and background
 * Used by: All pages
 */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    margin: 0;
    background-color: #f8fafc;
    color: #1f2937;
    line-height: 1.6;
}


/* ============================================================================
   SHARED CHAT/STREAMING UI COMPONENTS
   Used by: chat.html, email-client.html (future AI features)
   ============================================================================ */

/**
 * Assistant Surface: Card/bubble wrapper for AI assistant messages
 * Used by: chat.html
 * Future: email-client.html (when AI compose is added)
 *
 * Design: Translucent white card with soft shadow and rounded corners
 * following the app's glass morphism aesthetic.
 */
.assistant-surface {
    width: 100%;
    border-radius: 16px;
    border: 1px solid rgba(148, 163, 184, 0.28);
    background: rgba(255, 255, 255, 0.88);
    box-shadow: 0 12px 24px -18px rgba(15, 23, 42, 0.25);
    padding: 0.85rem 1.15rem;
}

@media (min-width: 640px) {
    .assistant-surface {
        padding: 1rem 1.35rem;
    }
}

/**
 * Assistant Thinking: Loading skeleton shown while AI is processing
 * Used by: chat.html
 * Future: email-client.html (AI compose)
 *
 * Shows animated placeholder lines to indicate active processing.
 */
.assistant-thinking .thinking-skeleton {
    position: relative;
    overflow: hidden;
    border-radius: 16px;
    padding: 0.65rem 0.9rem;
    border: 1px solid rgba(226, 232, 240, 0.85);
    background: linear-gradient(180deg, rgba(248, 250, 252, 0.88) 0%, rgba(241, 245, 249, 0.66) 100%);
}

.assistant-thinking .thinking-row {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    margin-bottom: 0.45rem;
}

.assistant-thinking .thinking-row:last-child {
    margin-bottom: 0;
}

.assistant-thinking .thinking-dot {
    height: 0.35rem;
    width: 0.35rem;
    border-radius: 9999px;
    background: rgba(148, 163, 184, 0.55);
}

.assistant-thinking .thinking-line {
    height: 7px;
    flex: 1;
    border-radius: 9999px;
    background: linear-gradient(90deg, rgba(226, 232, 240, .32) 0%, rgba(226, 232, 240, .7) 50%, rgba(226, 232, 240, .32) 100%);
    background-size: 200% 100%;
    animation: shimmer 1000ms ease-in-out infinite;
}

.assistant-thinking .thinking-row:nth-child(2) .thinking-line {
    width: 68%;
}

.assistant-thinking .thinking-row:nth-child(3) .thinking-line {
    width: 46%;
}

.assistant-thinking .thinking-cursor-bar {
    position: absolute;
    top: 12%;
    left: 0;
    height: 76%;
    width: 2px;
    background: rgba(15, 23, 42, .22);
    animation: cursor-sweep 1500ms ease-in-out infinite;
}

/**
 * Streaming Cursor: Blinking cursor shown during SSE streaming
 * Used by: chat.html
 * Future: email-client.html (AI compose)
 *
 * Indicates that content is actively being streamed from the server.
 */
.streaming-cursor {
    display: inline-block;
    animation: blink 900ms steps(1, end) infinite;
}

/**
 * Phase Badge: Status indicator for AI processing phases
 * Used by: chat.html (thinking/streaming states)
 * Future: email-client.html (AI compose states)
 *
 * Shows current phase: thinking, streaming, etc.
 */
.phase-badge {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    font-size: .7rem;
    letter-spacing: .08em;
    margin-bottom: .5rem;
    border-radius: 9999px;
    padding: .15rem .6rem;
    border: 1px solid rgba(148, 163, 184, .45);
    background: rgba(241, 245, 249, .7);
    color: #334155;
}

.phase-badge.phase-thinking {
    background: rgba(241, 245, 249, .8);
}

.phase-badge.phase-streaming {
    background: rgba(226, 232, 240, .7);
}

/**
 * Message Block: Container for chat messages
 * Used by: chat.html
 * Future: email-client.html (AI conversations)
 */
.message-block {
    display: flex;
}

/**
 * Message Assistant: Typography styles for AI assistant messages
 * Used by: chat.html
 *
 * Ensures proper spacing and list formatting in assistant responses.
 */
.message-assistant p {
    margin: 0.5em 0;
}

.message-assistant p:first-child {
    margin-top: 0;
}

.message-assistant p:last-child {
    margin-bottom: 0;
}

.message-assistant ul,
.message-assistant ol {
    margin: 0.5em 0;
    padding-left: 1.5em;
}

.message-assistant li {
    margin: 0.25em 0;
}


/* ============================================================================
   SHARED DROPDOWN COMPONENTS
   Used by: chat.html (thinking mode selector)
   ============================================================================ */

/**
 * Thinking Dropdown Menu: Dropdown for selecting AI thinking level
 * Used by: chat.html
 *
 * Responsive dropdown that adjusts position based on available viewport space.
 */
.thinking-dropdown-menu {
    max-height: min(300px, calc(100vh - 200px));
}


/* ============================================================================
   SHARED ANIMATIONS
   Used across multiple components and pages
   ============================================================================ */

/**
 * Shimmer: Left-to-right shimmer effect for loading states
 * Used by: .thinking-line (assistant thinking skeleton)
 */
@keyframes shimmer {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

/**
 * Cursor Sweep: Left-to-right sweep for cursor bar in loading states
 * Used by: .thinking-cursor-bar (assistant thinking skeleton)
 */
@keyframes cursor-sweep {
    0% {
        left: 0;
    }
    100% {
        left: 100%;
    }
}

/**
 * Blink: Simple on/off blinking animation
 * Used by: .streaming-cursor (SSE streaming indicator)
 */
@keyframes blink {
    0% {
        opacity: 1;
    }
    50% {
        opacity: .2;
    }
    100% {
        opacity: 1;
    }
}