/**
 * Mobile Responsiveness Enhancements for Principia Metaphysica
 * ==============================================================
 *
 * Comprehensive mobile-first responsive design for:
 * - Mobile breakpoints: 320px, 480px, 768px
 * - Touch-friendly tap targets (min 44-48px)
 * - Readable font sizes (min 16px base)
 * - Responsive tables with horizontal scrolling
 * - Proper image scaling
 * - MathJax/LaTeX formula overflow handling
 * - Code block wrapping/scrolling
 * - No horizontal overflow
 *
 * Copyright (c) 2025-2026 Andrew Keith Watts. All rights reserved.
 */

/* ============================================
   BASE MOBILE STYLES (All screens)
   ============================================ */

/* Prevent horizontal overflow */
html, body {
    overflow-x: hidden;
    max-width: 100%;
}

/* Images - always responsive */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Code blocks - horizontal scroll with touch support */
pre {
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    max-width: 100%;
    white-space: pre;
}

code {
    word-wrap: break-word;
    overflow-wrap: break-word;
}

/* Long URLs and text that might overflow */
a {
    word-wrap: break-word;
    overflow-wrap: break-word;
}

/* MathJax overflow prevention */
.MathJax,
.MathJax_Display,
.MathJax_Preview,
mjx-container {
    overflow-x: auto !important;
    overflow-y: hidden !important;
    -webkit-overflow-scrolling: touch;
    max-width: 100% !important;
}

/* Ensure MathJax doesn't break layout */
.mjx-chtml {
    overflow-x: auto;
    overflow-y: hidden;
}

/* ============================================
   TABLETS AND SMALL DESKTOPS (≤768px)
   ============================================ */
@media screen and (max-width: 768px) {
    /* Base font size for readability */
    body {
        font-size: 16px; /* iOS Safari won't zoom if >= 16px */
    }

    /* Main paper container */
    .paper {
        padding: 20px 15px !important;
        font-size: 10pt;
        overflow-x: hidden;
        max-width: 100%;
    }

    /* Headings */
    h1 {
        font-size: 18pt;
        line-height: 1.3;
        word-wrap: break-word;
    }

    h2 {
        font-size: 12pt;
        line-height: 1.3;
        word-wrap: break-word;
    }

    h3 {
        font-size: 11pt;
        line-height: 1.3;
    }

    h4 {
        font-size: 10pt;
        line-height: 1.3;
    }

    /* Formulas and equations */
    .equation,
    .formula-display,
    .formula-inline {
        font-size: 9pt;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        padding: 0.75rem;
        max-width: 100%;
    }

    /* Tables - horizontal scroll wrapper */
    table {
        display: block;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        font-size: 9pt;
        width: 100%;
        margin: 1rem 0;
    }

    thead, tbody, tr {
        display: table;
        width: 100%;
    }

    th, td {
        white-space: nowrap;
        min-width: 80px;
        padding: 0.4rem;
        font-size: 9pt;
    }

    /* Grid layouts */
    .formula-def-grid,
    .grid {
        grid-template-columns: 1fr !important;
        gap: 1rem;
    }

    /* Touch-friendly buttons (min 44px per iOS HIG) */
    .download-btn,
    button {
        min-height: 44px;
        min-width: 44px;
        padding: 12px 20px;
        font-size: 10pt;
        cursor: pointer;
    }

    /* Links - touch targets */
    a {
        min-height: 44px;
        display: inline-flex;
        align-items: center;
        padding: 8px;
    }

    /* Code blocks */
    pre {
        font-size: 8pt;
        padding: 0.75rem;
        overflow-x: auto;
        line-height: 1.4;
    }

    code {
        font-size: 8pt;
    }

    /* Info boxes */
    .warning-box,
    .success-box,
    .danger-box {
        padding: 0.75rem;
        font-size: 9pt;
        margin: 0.75rem 0;
    }

    /* Table of contents */
    .toc {
        padding: 1rem;
        font-size: 9pt;
    }

    /* Abstract */
    .abstract {
        padding: 1rem;
        font-size: 9pt;
    }

    /* Author info */
    .author,
    .affiliation,
    .date {
        font-size: 10pt;
    }

    /* Grade box */
    .grade-box {
        padding: 0.75rem;
    }

    .grade {
        font-size: 18pt;
    }
}

/* ============================================
   SMALL PHONES (≤480px)
   ============================================ */
@media screen and (max-width: 480px) {
    /* Maintain 16px base for no-zoom */
    body {
        font-size: 16px;
    }

    .paper {
        padding: 10px !important;
        font-size: 9pt;
        max-width: 100%;
    }

    /* Headings - smaller but readable */
    h1 {
        font-size: 16pt;
        word-wrap: break-word;
        margin: 0.75rem 0;
    }

    h2 {
        font-size: 11pt;
        margin: 0.5rem 0;
    }

    h3 {
        font-size: 10pt;
        margin: 0.5rem 0;
    }

    h4 {
        font-size: 9.5pt;
    }

    /* Formulas */
    .equation,
    .formula-display {
        font-size: 8pt;
        padding: 0.5rem;
        overflow-x: auto;
    }

    /* Tables */
    table {
        font-size: 8pt;
    }

    th, td {
        padding: 0.35rem;
        font-size: 8pt;
        min-width: 70px;
    }

    /* Code */
    pre {
        font-size: 7pt;
        padding: 0.5rem;
    }

    code {
        font-size: 7pt;
    }

    /* Full-width buttons */
    .download-btn {
        width: 100%;
        margin: 0.5rem 0;
        font-size: 9pt;
    }

    /* Compact spacing */
    ul, ol {
        margin: 0.5rem 0 0.5rem 1.5rem;
    }

    li {
        margin-bottom: 0.25rem;
        font-size: 9pt;
    }

    p {
        margin: 0.5rem 0;
    }

    /* Info boxes */
    .warning-box,
    .success-box,
    .danger-box {
        padding: 0.5rem;
        font-size: 8pt;
    }

    /* TOC */
    .toc {
        padding: 0.75rem;
        font-size: 8pt;
    }

    /* Abstract */
    .abstract {
        padding: 0.75rem;
        font-size: 8pt;
    }

    .abstract-title {
        font-size: 10pt;
    }
}

/* ============================================
   EXTRA SMALL PHONES (≤320px)
   ============================================ */
@media screen and (max-width: 320px) {
    .paper {
        padding: 8px !important;
        font-size: 8pt;
    }

    h1 {
        font-size: 14pt;
    }

    h2 {
        font-size: 10pt;
    }

    h3 {
        font-size: 9pt;
    }

    .equation,
    .formula-display {
        font-size: 7pt;
        padding: 0.4rem;
    }

    table {
        font-size: 7pt;
    }

    th, td {
        padding: 0.25rem;
        font-size: 7pt;
        min-width: 60px;
    }

    pre, code {
        font-size: 6.5pt;
    }

    .download-btn {
        font-size: 8pt;
        padding: 10px;
    }
}

/* ============================================
   TOUCH DEVICE OPTIMIZATIONS
   ============================================ */
@media (hover: none) and (pointer: coarse) {
    /* Larger tap targets for touch (48px iOS standard) */
    a,
    button,
    .pm-value,
    input,
    select,
    textarea {
        min-height: 48px;
        min-width: 48px;
        padding: 12px;
    }

    /* Disable transform effects that feel wrong on touch */
    a:hover,
    button:hover,
    .card:hover {
        transform: none !important;
    }

    /* Make tooltips tappable instead of hoverable */
    .pm-value,
    .formula-var {
        cursor: pointer;
    }

    /* Increase spacing for touch accuracy */
    nav a,
    nav button {
        padding: 12px 16px;
        margin: 4px;
    }
}

/* ============================================
   LANDSCAPE ORIENTATION (phones)
   ============================================ */
@media screen and (max-width: 768px) and (orientation: landscape) {
    .paper {
        padding: 15px 20px !important;
    }

    h1 {
        font-size: 16pt;
    }

    h2 {
        font-size: 11pt;
    }

    /* Use horizontal space better */
    table {
        font-size: 9pt;
    }
}

/* ============================================
   SPECIFIC COMPONENT FIXES
   ============================================ */

/* Auth overlay mobile */
@media screen and (max-width: 768px) {
    .auth-overlay {
        padding: 10px;
    }

    .auth-card {
        padding: 30px 20px;
        max-width: 100%;
    }

    .google-login-btn {
        width: 100%;
        max-width: 100%;
    }

    header .user-controls {
        position: relative;
        right: auto;
        transform: none;
        margin: 8px 0;
    }
}

/* Tooltip mobile adjustments */
@media screen and (max-width: 768px) {
    .pm-tooltip-popup,
    .var-tooltip {
        max-width: 90vw !important;
        min-width: 250px;
        font-size: 12px;
        left: 5vw !important;
        right: 5vw !important;
        transform: none !important;
    }

    .pm-tooltip-value {
        font-size: 14px;
    }
}

/* Interactive formula mobile - SCALE TO FIT, no scroll boxes */
@media screen and (max-width: 768px) {
    .interactive-formula {
        padding: 0.5rem;
        margin: 1rem 0;
        overflow: visible;
        position: relative;
        z-index: 10;
    }

    .formula-display {
        font-size: clamp(0.6rem, 2.5vw, 0.95rem);
        overflow: visible !important;
        white-space: normal;
        word-wrap: break-word;
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        align-items: center;
        gap: 0.25rem;
        line-height: 1.8;
    }

    .formula-display.large {
        font-size: clamp(0.55rem, 2.2vw, 0.85rem);
    }

    .formula-var {
        padding: 0.1rem 0.2rem;
        font-size: inherit;
        display: inline-flex;
        align-items: center;
        flex-wrap: wrap;
        position: relative;
    }

    .formula-op {
        font-size: inherit;
        padding: 0 0.15rem;
    }

    .expandable-formula {
        margin: 1rem 0;
        overflow: visible;
    }

    .sub-components {
        grid-template-columns: 1fr !important;
    }

    /* Formula tooltips - MUST appear above everything */
    .var-tooltip {
        position: fixed !important;
        left: 5vw !important;
        right: 5vw !important;
        top: 50% !important;
        transform: translateY(-50%) !important;
        width: 90vw !important;
        max-width: 90vw !important;
        z-index: 100000 !important;
        font-size: 0.85rem;
        padding: 1rem;
        background: var(--bg-secondary, #1a1a2e) !important;
        border: 1px solid rgba(139, 127, 255, 0.4) !important;
        border-radius: 12px !important;
        box-shadow: 0 10px 40px rgba(0, 0, 0, 0.8) !important;
    }

    .formula-var:hover .var-tooltip,
    .formula-var:focus .var-tooltip,
    .formula-var.touched .var-tooltip {
        display: block !important;
        opacity: 1 !important;
        visibility: visible !important;
    }
}

/* Extra small screens - even more compact formulas */
@media screen and (max-width: 480px) {
    .interactive-formula {
        padding: 0.4rem;
    }

    .formula-display {
        font-size: clamp(0.5rem, 2vw, 0.75rem);
        gap: 0.15rem;
    }

    .formula-display.large {
        font-size: clamp(0.45rem, 1.8vw, 0.7rem);
    }

    .formula-var {
        padding: 0.08rem 0.15rem;
    }

    .var-tooltip {
        font-size: 0.8rem;
        padding: 0.75rem;
    }
}

/* Diagram mobile - SCALE TO FIT, no scroll boxes */
@media screen and (max-width: 768px) {
    .diagram-container {
        padding: 0.75rem;
        overflow: hidden; /* No scroll boxes */
        max-width: 100%;
    }

    /* SVG scaling - fit to container width */
    .diagram-svg,
    svg:not(.google-icon):not(.google-icon-small) {
        width: 100% !important;
        max-width: 100% !important;
        height: auto !important;
        min-width: unset !important;
        object-fit: contain;
        display: block;
    }

    /* Ensure SVG viewBox scales properly */
    svg[viewBox] {
        width: 100%;
        height: auto;
    }

    /* Inline SVGs in flow diagrams */
    .flow-diagram,
    .scale-ladder,
    .coset-diagram {
        overflow: hidden;
        max-width: 100%;
    }

    .flow-diagram svg,
    .scale-ladder svg,
    .coset-diagram svg {
        width: 100% !important;
        height: auto !important;
        max-width: 100%;
    }

    .slider-control {
        flex-direction: column;
        align-items: stretch;
    }

    .calc-inputs {
        grid-template-columns: 1fr !important;
    }
}

/* Extra small screens - even more aggressive SVG scaling */
@media screen and (max-width: 480px) {
    .diagram-container {
        padding: 0.5rem;
    }

    /* Scale down SVG text for readability */
    svg text {
        font-size: 80% !important;
    }

    /* Ensure all SVG artwork scales */
    .diagram-svg,
    svg:not(.google-icon):not(.google-icon-small) {
        transform-origin: top left;
    }
}

/* ============================================
   PRINT MEDIA - OVERRIDE MOBILE
   ============================================ */
@media print {
    /* Reset all mobile styles for printing */
    body {
        font-size: 11pt !important;
        overflow-x: visible !important;
    }

    .paper {
        padding: 0 !important;
        max-width: none !important;
        overflow-x: visible !important;
    }

    table {
        display: table !important;
        font-size: 9pt !important;
        overflow: visible !important;
    }

    thead, tbody, tr {
        display: table-row-group !important;
    }

    tr {
        display: table-row !important;
    }

    th, td {
        display: table-cell !important;
        white-space: normal !important;
    }

    h1, h2, h3, h4, h5, h6 {
        page-break-after: avoid;
    }

    table, figure, img, .equation, .formula-display {
        page-break-inside: avoid;
    }

    /* Hide mobile-only elements */
    .download-btn,
    .user-controls,
    .auth-overlay {
        display: none !important;
    }
}

/* ============================================
   ACCESSIBILITY
   ============================================ */

/* Focus visible for keyboard navigation */
@media (hover: hover) and (pointer: fine) {
    a:focus-visible,
    button:focus-visible,
    input:focus-visible {
        outline: 2px solid #8b7fff;
        outline-offset: 2px;
    }
}

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* ============================================
   ADDITIONAL MOBILE UX IMPROVEMENTS
   ============================================ */

/* Mobile header and hamburger menu fixes */
@media screen and (max-width: 768px) {
    /* Ensure hamburger menu is visible and clickable */
    .pm-header .mobile-menu-btn {
        display: flex !important;
        z-index: 1001;
        touch-action: manipulation;
    }

    /* Mobile nav dropdown improvements */
    .pm-header .main-nav.mobile-open {
        display: block !important;
        max-height: 80vh;
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }

    /* Better touch targets for mobile nav links */
    .pm-header .main-nav a {
        min-height: 48px;
        display: flex;
        align-items: center;
        padding: 0.875rem 1rem;
        margin: 2px 0;
    }

    /* Cards and grids stack on mobile */
    .section-nav,
    .index-grid,
    .viz-grid,
    .formula-grid,
    .param-grid {
        grid-template-columns: 1fr !important;
        gap: 1rem;
    }

    /* Hero section mobile adjustments */
    .hero,
    .sim-hero,
    .paper-hero {
        padding: 1.5rem 1rem !important;
        margin: 1rem 0 !important;
    }

    .hero h1 {
        font-size: 1.5rem !important;
        line-height: 1.3;
    }

    /* Fix content overflow */
    .paper,
    .content,
    .main-content,
    main {
        max-width: 100vw;
        overflow-x: hidden;
        padding-left: 1rem;
        padding-right: 1rem;
    }

    /* Simulation code blocks scroll */
    .sim-code,
    .code-block,
    pre.language-python {
        max-width: 100%;
        overflow-x: auto;
        font-size: 0.75rem;
    }

    /* Better spacing for section cards */
    .section-card {
        padding: 1.25rem;
        margin-bottom: 0.75rem;
    }

    /* Navigation buttons stack */
    .nav-buttons,
    .downloads,
    .button-group {
        flex-direction: column;
        gap: 0.75rem;
    }

    .nav-buttons a,
    .download-btn,
    .nav-btn {
        width: 100%;
        text-align: center;
        justify-content: center;
    }
}

/* Extra small screens - more aggressive fixes */
@media screen and (max-width: 480px) {
    /* Very compact header */
    .pm-header {
        padding: 0.5rem 1rem;
    }

    .pm-header .site-title {
        font-size: 1rem;
    }

    /* Hide long text, show icons only if available */
    .pm-header .user-email {
        display: none !important;
    }

    /* Compact hero */
    .hero h1 {
        font-size: 1.25rem !important;
    }

    .hero .subtitle {
        font-size: 0.9rem !important;
    }

    /* Smaller section numbers */
    .section-number {
        width: 28px;
        height: 28px;
        font-size: 0.75rem;
    }

    /* Tighter formula display */
    .interactive-formula,
    .formula-display {
        padding: 0.5rem;
        font-size: 0.7rem !important;
    }

    /* Fix long equations */
    .equation-highlight,
    .formula-plaintext {
        font-size: 0.65rem;
        padding: 0.75rem 0.5rem;
        overflow-x: auto;
    }
}

/* iOS safe area support for notched devices */
@supports (padding: env(safe-area-inset-bottom)) {
    .pm-header {
        padding-left: env(safe-area-inset-left);
        padding-right: env(safe-area-inset-right);
    }

    body {
        padding-bottom: env(safe-area-inset-bottom);
    }
}

/* Fix sticky header on mobile */
@media screen and (max-width: 768px) {
    .pm-header {
        position: sticky;
        top: 0;
        z-index: 1000;
    }

    /* Ensure content doesn't get hidden behind sticky header */
    main,
    #main-content {
        scroll-margin-top: 80px;
    }
}