/*
Theme Name: Isabel Clarke
Theme URI: 
Author: Chris Clarke
Author URI: http://www.scispirit.com
Description: Modern custom theme for Isabel Clarke's website. Clean, responsive design with card-based layouts.
Version: 2.0
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: isabelclarke
*/

/* ========================================
   Design Tokens
   ======================================== */

:root {
    --color-primary: #5C2D82;
    --color-primary-light: #7B4FA0;
    --color-primary-dark: #3D1A5C;
    --color-accent: #6B3FA0;
    --color-link: #5B2DB0;
    --color-link-hover: #3F00CE;
    --color-link-visited: #7B4FA0;
    --color-text: #1a1a2e;
    --color-text-muted: #4a4a5a;
    --color-text-light: #6a6a7a;
    --color-bg: #f0f4f8;
    --color-bg-white: #ffffff;
    --color-bg-warm: #faf8f5;
    --color-bg-accent: #f3e8ff;
    --color-border: #e2e8f0;
    --color-border-light: #edf0f4;
    --color-clinical-bg: #f5eef8;
    --color-clinical-header: #fff5eb;
    --color-clinical-heading: #8B4006;
    --color-clinical-text: #6B2090;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-heading: 'Merriweather', Georgia, serif;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.1);
    --shadow-xl: 0 12px 40px rgba(0,0,0,0.12);
    --transition: 0.2s ease;
    --max-width: 1100px;
    --content-width: 780px;
    --header-height: 72px;
}

/* ========================================
   Reset & Base
   ======================================== */

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

html {
    font-size: 100%;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-body);
    font-size: 17px;
    line-height: 1.7;
    color: var(--color-text);
    padding: 0;
    margin: 0;
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--color-link);
    text-decoration: none;
    transition: color var(--transition);
}

a:hover {
    color: var(--color-link-hover);
    text-decoration: underline;
}

a:visited {
    color: var(--color-link-visited);
}

a:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: 2px;
}

/* ========================================
   Typography
   ======================================== */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--color-primary);
    font-weight: 600;
    line-height: 1.3;
    margin: 1.5em 0 0.6em;
}

h1 { font-size: clamp(1.6rem, 3vw, 2rem); }
h2 { font-size: clamp(1.35rem, 2.5vw, 1.65rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.35rem); }
h4 { font-size: 1.1rem; font-weight: 700; }

p {
    margin: 0 0 1.2em;
}

ul, ol {
    padding: 0;
    margin: 0 0 1.2em 1.5em;
}

li {
    padding-bottom: 0.4em;
}

ul li::marker {
    color: var(--color-primary-light);
}

strong, b {
    font-weight: 600;
}

em, i {
    font-style: italic;
}

blockquote {
    border-left: 4px solid var(--color-primary);
    padding: 1em 1.5em;
    margin: 1.5em 0;
    background: var(--color-bg-accent);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

hr {
    border: none;
    height: 1px;
    background: var(--color-border);
    margin: 2em 0;
}

/* ========================================
   Layout
   ======================================== */

.site-wrapper {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.site-content {
    padding: 40px 0 80px;
}

.entry-content {
    max-width: var(--content-width);
    margin: 0 auto;
    padding: 0 24px;
}

.entry-content h1,
.entry-content h2,
.entry-content h3 {
    text-align: left;
}

/* ========================================
   Skip to Content Link
   ======================================== */

.skip-link {
    position: absolute;
    top: -100%;
    left: 16px;
    background: var(--color-primary);
    color: #fff;
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    z-index: 9999;
    font-weight: 600;
}

.skip-link:focus {
    top: 16px;
    color: #fff;
    text-decoration: none;
}

/* ========================================
   Header & Navigation
   ======================================== */

.site-header {
    background-color: var(--color-bg-white);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
    height: var(--header-height);
}

.header-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.site-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.site-logo img {
    height: 48px;
    width: auto;
    border: none;
}

.site-name {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-primary);
    white-space: nowrap;
}

.site-name:hover {
    text-decoration: none;
}

/* Desktop Navigation */
.main-nav {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-group {
    position: relative;
}

.nav-group-trigger {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 16px;
    background: none;
    border: none;
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: background var(--transition), color var(--transition);
}

.nav-group-trigger:hover {
    background: var(--color-bg-accent);
    color: var(--color-primary);
    text-decoration: none;
}

.nav-group-trigger svg {
    width: 12px;
    height: 12px;
    transition: transform var(--transition);
}

.nav-group.open .nav-group-trigger svg {
    transform: rotate(180deg);
}

.nav-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background: var(--color-bg-white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--color-border-light);
    padding: 8px 0;
    min-width: 240px;
    max-width: 320px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
}

.nav-group.open .nav-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.nav-dropdown a {
    display: block;
    padding: 10px 20px;
    font-size: 0.9rem;
    color: var(--color-text);
    transition: background var(--transition), color var(--transition);
    border-radius: 0;
}

.nav-dropdown a:hover,
.nav-dropdown a.current {
    background: var(--color-bg-accent);
    color: var(--color-primary);
    text-decoration: none;
}

.nav-dropdown a.current {
    font-weight: 600;
}

.nav-dropdown-label {
    display: block;
    padding: 8px 20px 4px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-light);
}

/* Mobile Menu Toggle */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: var(--radius-sm);
    color: var(--color-text);
}

.nav-toggle:hover {
    background: var(--color-bg-accent);
}

.nav-toggle svg {
    width: 24px;
    height: 24px;
    display: block;
}

.nav-toggle .icon-close {
    display: none;
}

.nav-toggle.active .icon-menu {
    display: none;
}

.nav-toggle.active .icon-close {
    display: block;
}

/* Mobile Navigation */
@media (max-width: 900px) {
    .nav-toggle {
        display: block;
    }

    .main-nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--color-bg-white);
        flex-direction: column;
        align-items: stretch;
        padding: 20px 24px;
        overflow-y: auto;
        transform: translateX(100%);
        transition: transform 0.3s ease;
        gap: 8px;
    }

    .main-nav.open {
        transform: translateX(0);
    }

    .nav-group {
        border-bottom: 1px solid var(--color-border);
    }

    .nav-group-trigger {
        width: 100%;
        justify-content: space-between;
        padding: 14px 0;
    }

    .nav-dropdown {
        position: static;
        box-shadow: none;
        border: none;
        padding: 0 0 12px 16px;
        min-width: auto;
        max-width: none;
        opacity: 1;
        visibility: visible;
        transform: none;
        display: none;
    }

    .nav-group.open .nav-dropdown {
        display: block;
    }
}

/* ========================================
   Hero Section
   ======================================== */

.hero {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    color: #fff;
    padding: 60px 0 50px;
    text-align: center;
}

.hero .site-wrapper {
    max-width: 800px;
}

.hero h1 {
    color: #fff;
    font-size: clamp(2rem, 5vw, 3rem);
    margin: 0 0 0.3em;
    font-weight: 700;
}

.hero-subtitle {
    font-size: 1.15rem;
    opacity: 0.9;
    margin: 0 0 1.5em;
    font-weight: 400;
}

.hero-description {
    font-size: 1.05rem;
    line-height: 1.8;
    opacity: 0.92;
    margin: 0 auto;
    max-width: 650px;
}

.hero-description a {
    color: #fff;
    text-decoration: underline;
    text-underline-offset: 3px;
}

.hero-description a:hover {
    opacity: 0.85;
}

/* ========================================
   Section Cards (Homepage)
   ======================================== */

.sections-grid {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 50px 24px 80px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.section-card {
    background: var(--color-bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    padding: 32px;
    transition: box-shadow var(--transition), transform var(--transition);
    border: 1px solid var(--color-border-light);
}

.section-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.section-card h3 {
    margin-top: 0;
    font-size: 1.25rem;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--color-bg-accent);
}

.section-card h3 a {
    color: var(--color-primary);
}

.section-card h3 a:hover {
    color: var(--color-link-hover);
    text-decoration: none;
}

.section-card p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 1em;
}

.section-card a {
    font-size: 0.9rem;
    font-weight: 500;
}

.section-card ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.section-card li {
    padding: 8px 0;
    border-bottom: 1px solid var(--color-border-light);
    font-size: 0.9rem;
}

.section-card li:last-child {
    border-bottom: none;
}

.section-card--wide {
    grid-column: 1 / -1;
}

/* ========================================
   Publications / Papers List
   ======================================== */

.publications-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.publications-list li {
    padding: 16px 0;
    border-bottom: 1px solid var(--color-border-light);
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.publications-list li:last-child {
    border-bottom: none;
}

.publication-title {
    font-weight: 600;
    color: var(--color-text);
}

.publication-citation {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    font-style: italic;
}

/* ========================================
   Podcast Cards
   ======================================== */

.podcast-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    margin: 1.5em 0;
}

.podcast-card {
    background: var(--color-bg-white);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    padding: 24px;
    transition: box-shadow var(--transition);
}

.podcast-card:hover {
    box-shadow: var(--shadow-md);
}

.podcast-card h4 {
    margin-top: 0;
    font-size: 1rem;
    color: var(--color-primary);
}

.podcast-card a {
    display: inline-block;
    margin-top: 8px;
    font-size: 0.85rem;
    font-weight: 500;
}

/* ========================================
   Content Pages
   ======================================== */

.page-header {
    background: var(--color-bg-white);
    border-bottom: 1px solid var(--color-border);
    padding: 40px 0;
    text-align: center;
}

.page-header h1 {
    margin: 0;
    font-size: clamp(1.5rem, 3vw, 2.25rem);
}

.page-content {
    padding: 50px 0 80px;
}

.page-content .entry-content {
    max-width: var(--content-width);
}

/* ========================================
   Back to Top Button
   ======================================== */

.back-to-top {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 44px;
    height: 44px;
    background: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
    z-index: 100;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--color-primary-dark);
}

.back-to-top svg {
    width: 20px;
    height: 20px;
}

/* ========================================
   Footer
   ======================================== */

.site-footer {
    background: var(--color-bg-white);
    border-top: 1px solid var(--color-border);
    padding: 40px 0;
}

.footer-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 32px;
}

.footer-nav h4 {
    margin-top: 0;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-light);
}

.footer-nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.footer-nav li {
    padding: 4px 0;
}

.footer-nav a {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.footer-nav a:hover {
    color: var(--color-primary);
    text-decoration: none;
}

.footer-credit {
    text-align: center;
    padding: 24px 0 0;
    margin-top: 32px;
    border-top: 1px solid var(--color-border);
    font-size: 0.85rem;
    color: var(--color-text-light);
}

/* ========================================
   Forms
   ======================================== */

fieldset {
    background-color: var(--color-bg-white);
    border: 1px solid var(--color-border);
    padding: 24px;
    margin-bottom: 24px;
    border-radius: var(--radius-md);
}

legend {
    font-weight: 600;
    color: var(--color-primary);
    font-size: 1.1rem;
    padding: 0 8px;
}

label {
    color: var(--color-text);
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
}

input[type="text"],
input[type="email"],
input[type="tel"],
input[type="url"],
textarea,
select {
    padding: 12px 14px;
    border: 1px solid var(--color-border);
    background-color: var(--color-bg-white);
    font-size: 1rem;
    font-family: var(--font-body);
    width: 100%;
    max-width: 480px;
    border-radius: var(--radius-sm);
    transition: border-color var(--transition), box-shadow var(--transition);
}

input[type="text"]:hover,
input[type="text"]:focus,
input[type="email"]:hover,
input[type="email"]:focus,
textarea:hover,
textarea:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(92, 45, 130, 0.1);
    outline: none;
}

input[type="submit"],
button {
    padding: 12px 28px;
    background-color: var(--color-primary);
    border: none;
    color: #fff;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    font-family: var(--font-body);
    border-radius: var(--radius-sm);
    transition: background var(--transition);
}

input[type="submit"]:hover,
button:hover {
    background-color: var(--color-primary-dark);
}

/* ========================================
   Responsive
   ======================================== */

@media (max-width: 768px) {
    :root {
        --header-height: 60px;
    }

    .hero {
        padding: 40px 0 30px;
    }

    .sections-grid {
        grid-template-columns: 1fr;
        padding: 30px 16px 60px;
    }

    .section-card {
        padding: 24px;
    }

    .footer-inner {
        flex-direction: column;
        gap: 24px;
    }

    .entry-content {
        padding: 0 16px;
    }

    .podcast-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    body {
        font-size: 16px;
    }

    .header-inner {
        padding: 0 16px;
    }

    .site-name {
        font-size: 1rem;
    }
}

/* ========================================
   Admin Bar
   ======================================== */

.admin-bar .site-header {
    top: 32px;
}

@media (max-width: 782px) {
    .admin-bar .site-header {
        top: 46px;
    }
}

/* ========================================
   Clinical Theme Overrides
   ======================================== */

body.clinical-theme {
    --color-primary: var(--color-clinical-heading);
    --color-primary-light: #A0551A;
    --color-primary-dark: #6B3005;
    --color-accent: #A0551A;
    --color-link: #3322cc;
    --color-link-hover: #2211aa;
    --color-link-visited: #3322aa;
    --color-bg: var(--color-clinical-bg);
    --color-bg-accent: #f8f0ff;
    --color-text: #4A1060;
    --color-text-muted: #5A3070;
}

.clinical-theme .site-header,
.clinical-theme .page-header {
    background: var(--color-clinical-header);
}

.clinical-theme .hero {
    background: linear-gradient(135deg, #8B4006 0%, #A0551A 100%);
}

.clinical-theme .section-card:hover {
    transform: none;
}

.clinical-theme .back-to-top {
    background: var(--color-clinical-heading);
}

.clinical-theme .back-to-top:hover {
    background: #6B3005;
}