/* ==================================================================
           Landing page — page-specific styles.
           Shared design system comes from /css/main.css (linked above);
           this page intentionally keeps its own minimal look and overrides
           the few main.css rules that don't apply here.
           ================================================================== */
        /* === DESIGN TOKENS === */
        :root {
            --primary-color: #3949ab;
            --primary-dark: #1a237e;
            --secondary-color: #ffa726;
            --accent-color: #9c27b0;
            --text-color: #333333;
            --text-light: #ffffff;
            --bg-color: #ffffff;
            --surface-color: #e0e0e0;

            --dark-bg: #0c0e14;
            --dark-surface: #151924;
            --dark-surface-light: #1d2331;
            --dark-text: #e6eaf0;
            --dark-text-muted: #95a0b1;
            --dark-border: #2b3648;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }

        html {
            background-color: var(--bg-color);
            overscroll-behavior: none;
        }

        html,
        body {
            margin: 0;
            padding: 0;
            width: 100%;
            font-family: 'Google Sans Flex', 'Roboto', sans-serif;
            color: var(--text-color);
            overflow-x: hidden;
            line-height: 1.5;
            text-rendering: optimizeLegibility;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            -webkit-user-select: none;
            user-select: none;
        }

        body {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            min-height: 100vh;
            min-height: 100dvh;
            background: var(--bg-color);
        }

        /* === LAYOUT === */
        .page-wrapper {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            flex-grow: 1;
            width: 100%;
            max-width: 800px;
            padding: 40px 20px;
            position: relative;
            z-index: 1;
        }

        /* === PROFILE === */
        .profile-section {
            text-align: center;
            margin-bottom: 32px;
        }

        .profile-photo {
            width: 130px;
            height: 130px;
            border-radius: 50%;
            object-fit: cover;
            box-shadow: 0 4px 16px rgba(57, 73, 171, 0.18);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .profile-photo:hover {
            transform: scale(1.05);
            box-shadow: 0 6px 24px rgba(57, 73, 171, 0.25);
        }

        .profile-name {
            font-size: 4.5em;
            font-weight: 300;
            margin: 12px 0 24px 0;
            color: var(--text-color);
            font-family: "Playwrite GB J", cursive;
            font-optical-sizing: auto;
            font-style: italic;
            line-height: 1.1;
        }

        .profile-subtitle {
            font-size: 0.85em;
            margin: 0;
            color: #888;
            font-weight: 500;
            letter-spacing: 0.12em;
            text-transform: uppercase;
        }

        .profile-links {
            display: flex;
            justify-content: center;
            gap: 16px;
            margin-top: 14px;
        }

        .profile-links a {
            color: var(--primary-dark);
            font-size: 1.4em;
            transition: color 0.3s ease, transform 0.2s ease;
            text-decoration: none;
            display: inline-flex;
        }

        .profile-links a:hover {
            color: var(--primary-color);
            transform: scale(1.1);
        }

        /* === BUTTON GROUPS === */
        .button-groups {
            display: flex;
            flex-direction: column;
            gap: 8px;
            width: 100%;
        }

        .button-group {
            display: flex;
            flex-wrap: wrap;
            gap: 2px;
            justify-content: center;
        }

        .button-group a {
            text-decoration: none;
            color: inherit;
        }

        .group-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 22px;
            font-family: 'Google Sans Flex', 'Roboto', sans-serif;
            font-size: 0.92em;
            font-weight: 500;
            color: #444;
            background-color: #f0f0f3;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            -webkit-user-select: none;
            user-select: none;
            transition: border-radius 0.25s cubic-bezier(.4, 0, .2, 1),
                box-shadow 0.25s cubic-bezier(.4, 0, .2, 1),
                filter 0.15s ease,
                color 0.25s ease,
                background-color 0.25s ease;
        }

        .group-btn i,
        .group-btn svg {
            font-size: 1em;
            color: var(--primary-color);
            transition: color 0.25s ease;
        }

        /* Row-aware border radii (applied via JS) */
        .group-btn.first-in-row {
            border-top-left-radius: 20px !important;
            border-bottom-left-radius: 20px !important;
        }

        .group-btn.last-in-row {
            border-top-right-radius: 20px !important;
            border-bottom-right-radius: 20px !important;
        }

        .group-btn.only-in-row {
            border-radius: 20px !important;
        }

        .group-btn:hover {
            border-radius: 20px !important;
            box-shadow: inset 0 0 0 1.5px rgba(0, 0, 0, 0.25), 0 2px 5px rgba(0, 0, 0, 0.15);
            filter: brightness(1.03);
        }

        .group-btn:active {
            border-radius: 20px;
            transform: scale(0.97);
            box-shadow: inset 0 0 0 2px rgba(0, 0, 0, 0.35), 0 1px 2px rgba(0, 0, 0, 0.1);
            filter: brightness(0.9);
        }

        /* === FOOTER === */
        .footer {
            width: 100%;
            max-width: 800px;
            text-align: center;
            padding: 20px;
            color: var(--primary-dark);
            -webkit-user-select: none;
            user-select: none;
        }

        .footer-tools {
            display: flex;
            justify-content: center;
            gap: 10px;
            margin-bottom: 10px;
        }

        .theme-toggle {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            /* width/height/box-shadow reset the boxed toggle from main.css —
               here it's a plain icon */
            width: auto;
            height: auto;
            box-shadow: none;
            color: var(--text-color);
            cursor: pointer;
            font-size: 1.25em;
            transition: transform 0.15s ease, color 0.2s ease;
            opacity: 0.8;
            padding: 8px;
            border: none;
            background: none;
            outline: none;
            -webkit-tap-highlight-color: transparent;
        }

        .theme-toggle:hover {
            transform: scale(1.15);
            opacity: 1;
            box-shadow: none;
            color: var(--primary-color);
        }

        .theme-toggle:active {
            transform: scale(0.95);
        }

        /* The FontAwesome kit replaces the <i> with an <svg> that keeps the
           .theme-toggle class; the height:auto reset above would let that svg
           expand to the full container width. Pin it to icon size. */
        svg.theme-toggle {
            height: 1em;
            width: auto;
        }

        .social-links {
            margin-bottom: 10px;
        }

        .social-links a {
            color: var(--primary-dark);
            font-size: 1.0em;
            margin: 0 10px;
            transition: color 0.3s;
            display: inline-block;
            text-decoration: none;
        }

        .social-links a:hover {
            color: var(--secondary-color);
        }

        .footer .copyright {
            font-size: 0.75em;
            text-transform: uppercase;
            letter-spacing: 2px;
            font-weight: 700;
            margin: 0;
            color: inherit;
            opacity: 0.7;
        }

        /* === CAT COMPANION ===
           Sizing, animation, and bubble styling are shared with teaching/index.html via
           main.css. This page only overrides the responsive breakpoints (below), since it
           has no mobile FAB nav to hand the cat's space off to. */

        /* === RESPONSIVE === */
        /* main.css removes the cat below 1400px in favour of the mobile FAB nav (not present
           on this page); keep it visible down to 1000px instead, where it shrinks away. */
        @media (max-width: 1400px) {
            #cat-companion {
                display: block;
            }
        }

        @media (max-width: 1000px) {
            #cat-companion {
                transform: translateY(120%) scale(0.5);
                opacity: 0;
                pointer-events: none;
            }
        }

        @media (max-width: 600px) {
            .page-wrapper {
                padding: 30px 16px;
            }

            .profile-photo {
                width: 100px;
                height: 100px;
            }

            .group-btn {
                padding: 11px 16px;
                font-size: 0.85em;
            }
        }


        /* ============================== */
        /*    DARK THEME — EXPLICIT       */
        /* ============================== */
        html[data-theme="dark"] {
            color-scheme: dark;
            background-color: var(--dark-bg);
        }

        html[data-theme="dark"] body {
            color: var(--dark-text);
            background: var(--dark-bg);
        }

        html[data-theme="dark"] .profile-name {
            color: var(--dark-text);
        }

        html[data-theme="dark"] .profile-subtitle {
            color: var(--dark-text-muted);
        }

        html[data-theme="dark"] .profile-links a {
            color: var(--dark-text-muted);
        }

        html[data-theme="dark"] .profile-links a:hover {
            color: #8c9eff;
        }

        html[data-theme="dark"] .profile-photo {
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
        }

        html[data-theme="dark"] .group-btn {
            background-color: var(--dark-surface-light);
            color: var(--dark-text);
        }

        html[data-theme="dark"] .group-btn i,
        html[data-theme="dark"] .group-btn svg {
            color: #8c9eff;
        }

        html[data-theme="dark"] .group-btn:hover {
            box-shadow: inset 0 0 0 1.5px rgba(255, 255, 255, 0.2), 0 2px 5px rgba(0, 0, 0, 0.3);
            filter: brightness(1.1);
        }

        html[data-theme="dark"] .group-btn:active {
            box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.25), 0 1px 2px rgba(0, 0, 0, 0.2);
            filter: brightness(0.85);
        }

        html[data-theme="dark"] .theme-toggle {
            color: var(--dark-text);
            /* main.css's dark theme paints the boxed toggle (surface bg +
               border) at this same specificity — keep it a plain icon here */
            background: none;
            border: none;
            box-shadow: none;
        }

        html[data-theme="dark"] .footer {
            color: var(--dark-text-muted);
        }

        html[data-theme="dark"] .social-links a {
            color: var(--dark-text-muted);
        }

        html[data-theme="dark"] .social-links a:hover {
            color: var(--secondary-color);
        }

        /* ============================== */
        /*    DARK THEME — AUTO (SYSTEM)  */
        /* ============================== */
        @media (prefers-color-scheme: dark) {
            html:not([data-theme="light"]) {
                color-scheme: dark;
                background-color: var(--dark-bg);
            }

            html:not([data-theme="light"]) body {
                color: var(--dark-text);
                background: var(--dark-bg);
            }

            html:not([data-theme="light"]) .profile-name {
                color: var(--dark-text);
            }

            html:not([data-theme="light"]) .profile-subtitle {
                color: var(--dark-text-muted);
            }

            html:not([data-theme="light"]) .profile-links a {
                color: var(--dark-text-muted);
            }

            html:not([data-theme="light"]) .profile-links a:hover {
                color: #8c9eff;
            }

            html:not([data-theme="light"]) .profile-photo {
                box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
            }

            html:not([data-theme="light"]) .group-btn {
                background-color: var(--dark-surface-light);
                color: var(--dark-text);
            }

            html:not([data-theme="light"]) .group-btn i,
            html:not([data-theme="light"]) .group-btn svg {
                color: #8c9eff;
            }

            html:not([data-theme="light"]) .group-btn:hover {
                box-shadow: inset 0 0 0 1.5px rgba(255, 255, 255, 0.2), 0 2px 5px rgba(0, 0, 0, 0.3);
                filter: brightness(1.1);
            }

            html:not([data-theme="light"]) .group-btn:active {
                box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.25), 0 1px 2px rgba(0, 0, 0, 0.2);
                filter: brightness(0.85);
            }

            html:not([data-theme="light"]) .theme-toggle {
                color: var(--dark-text);
                /* keep in sync with the manual-dark rule above */
                background: none;
                border: none;
                box-shadow: none;
            }

            html:not([data-theme="light"]) .footer {
                color: var(--dark-text-muted);
            }

            html:not([data-theme="light"]) .social-links a {
                color: var(--dark-text-muted);
            }

            html:not([data-theme="light"]) .social-links a:hover {
                color: var(--secondary-color);
            }
        }

        /* Explicit light override */
        [data-theme="light"] {
            color-scheme: light;
        }