/* ===================================
PURPLE-BLUE ARTICLE THEME: ROOT VARIABLES
=================================== */
:root {
    --primary-purple-deep: #6B46C1;
    --primary-purple-mid: #7C3AED;
    --primary-purple-light: #8B5CF6;

    --accent-blue-deep: #2563EB;
    --accent-blue-mid: #3B82F6;
    --accent-blue-light: #60A5FA;

    --lavender-soft: #E9D5FF;
    --mint-green: #6EE7B7;
    --coral-warm: #FB923C;
    --indigo-deep: #312E81;

    --bg-dark-primary: #0a0e1a;
    --bg-dark-secondary: #1E1B4B;
    --bg-dark-tertiary: #151537;

    --bg-light-primary: #ffffff;
    --bg-light-secondary: #F8FAFC;

    --text-light: #dddbe0;
    --text-dark: #1E293B;

    --gradient-purple-blue: linear-gradient(135deg, var(--primary-purple-mid) 0%, var(--accent-blue-mid) 100%);
    --gradient-purple-blue-radial: radial-gradient(circle at top right, var(--primary-purple-light), var(--accent-blue-light));

    --spacing-xs: 0.5rem;
    --spacing-sm: 1.2rem;
    --spacing-md: 2.4rem;
    --spacing-lg: 4rem;
    --spacing-xl: 7rem;

    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Space Grotesk', sans-serif;
    --font-serif: 'Playfair Display', Georgia, serif;

    --transition-fast: 0.2s ease;
    --transition-medium: 0.4s ease;
    --transition-slow: 0.6s ease;

    --shadow-md: 0 4px 16px rgba(124, 58, 237, 0.14);
    --shadow-lg: 0 12px 36px rgba(124, 58, 237, 0.23);
    --shadow-glow: 0 0 40px rgba(124, 58, 237, 0.3);
}

/* ===================================
GLOBAL RESET, BODY, TYPOGRAPHY
=================================== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html {
    font-size: 17px;
    scroll-behavior: smooth;
}
body {
    font-family: var(--font-body);
    background: var(--bg-dark-primary);
    color: var(--text-light);
    min-height: 100vh;
    line-height: 1.7;
    letter-spacing: 0.01em;
    overflow-x: hidden;
}

/* ===================================
HEADINGS & SECTION TITLES
=================================== */
h1, h2, h3, h4, h5 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.17;
    margin-bottom: 1rem;
    color: var(--primary-purple-light);
    letter-spacing: -0.01em;
}
h1 {
    font-size: clamp(2.2rem, 6vw, 4.5rem);
    background: var(--gradient-purple-blue);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-lg);
}
h2 {
    font-size: 2.5rem;
    background: var(--gradient-purple-blue);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: var(--spacing-xl) 0 var(--spacing-lg) 0;
    text-align: center;
}
.section-title {
    font-size: 2.4rem;
    color: var(--accent-blue-light);
    margin: var(--spacing-lg) 0 var(--spacing-md) 0;
    padding-bottom: 0.2em;
    position: relative;
    text-align: center;
}
.section-title::after {
    content: '';
    display: block;
    margin: 18px auto 0 auto;
    width: 64px;
    height: 3px;
    border-radius: 2px;
    background: var(--primary-purple-light);
}

/* ===================================
LINK STYLES
=================================== */
a {
    color: var(--accent-blue-light);
    text-decoration: none;
    transition: color var(--transition-fast);
}
a:hover {
    color: var(--primary-purple-light);
}
.source-link {
    color: var(--accent-blue-light);
    border-bottom: 1px dashed var(--accent-blue-light);
}
.source-link:hover {
    color: var(--primary-purple-light);
    border-bottom: 1px solid var(--primary-purple-light);
}

p, ul, ol {
    margin-bottom: 1.3rem;
    line-height: 1.8;
    max-width: 72ch;
}

ul, ol {
    padding-left: 2em;
}

/* ===================================
CONTAINER & CONTENT WIDTH
=================================== */
.content-section {
    width: 100%;
    max-width: 1400px;          /* very wide area! */
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
    padding-bottom: var(--spacing-xl);
}

/* ===================================
HERO SECTION
=================================== */
.hero-section {
    background: var(--gradient-purple-blue);
    color: var(--text-light);
    padding: var(--spacing-xl) var(--spacing-lg) var(--spacing-lg) var(--spacing-lg);
    text-align: center;
    position: relative;
    border-bottom-left-radius: 1vw;
    border-bottom-right-radius: 1vw;
    box-shadow: var(--shadow-glow);
}
.hero-title {
    font-family: var(--font-serif);
    font-weight: 900;
    font-size: clamp(2.6rem, 7vw, 5.2rem);
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.01em;
    background: var(--gradient-purple-blue);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-subtitle {
    font-size: 1.35rem;
    opacity: 0.93;
    font-weight: 400;
    margin-bottom: var(--spacing-lg);
    max-width: 60ch;
    margin-left: auto;
    margin-right: auto;
    color: var(--lavender-soft);
}
.action-buttons {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
    flex-wrap: wrap;
}

/* ===================================
BUTTONS
=================================== */
.btn {
    padding: 1.2rem 2.7rem;
    border-radius: 40px;
    font-size: 1.11rem;
    font-weight: 600;
    border: none;
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-fast);
    margin-bottom: var(--spacing-xs);
    background: var(--accent-blue-light);
    color: var(--bg-dark-primary);
    box-shadow: var(--shadow-md);
}
.btn-primary {
    background: var(--primary-purple-mid);
    color: #fff;
}
.btn-primary:hover {
    background: var(--primary-purple-light);
    color: #fff;
}
.btn-secondary {
    background: var(--accent-blue-light);
    color: var(--bg-dark-primary);
}
.btn-secondary:hover {
    background: var(--accent-blue-mid);
    color: #fff;
}

/* ===================================
CARD & GRID SYSTEM
=================================== */
.card {
    background: rgba(124,58,237,0.09);
    border: 1.5px solid rgba(124,58,237,0.18);
    border-radius: 1.2rem;
    box-shadow: var(--shadow-md);
    padding: var(--spacing-xl) var(--spacing-lg);
    margin: var(--spacing-lg) 0;
    color: var(--text-light);
    transition: var(--transition-fast);
}
.card:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-purple-light);
    transform: translateY(-4px);
}
.card h3 {
    color: var(--primary-purple-light);
    margin-bottom: var(--spacing-sm);
}

/* Stat Grid */
.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
}
.stat-card {
    background: rgba(59,130,246,0.10);
    border: 1px solid rgba(59,130,246,0.26);
    border-radius: 0.9rem;
    text-align: center;
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-md) var(--spacing-md);
    box-shadow: var(--shadow-md);
}
.stat-number {
    font-size: 2.35rem;
    font-weight: 700;
    color: var(--accent-blue-light);
    display: block;
    margin-bottom: 0.7rem;
}

/* ===================================
PATIENT STORY/TESTIMONIAL BOXES
=================================== */
.patient-story {
    background: linear-gradient(120deg, var(--bg-dark-secondary) 80%, rgba(124, 58, 237, 0.17) 100%);
    border-left: 5px solid var(--primary-purple-light);
    padding: var(--spacing-xl) var(--spacing-lg);
    margin: var(--spacing-lg) 0;
    border-radius: 1rem;
    font-style: italic;
    color: var(--lavender-soft);
    box-shadow: var(--shadow-md);
}
.patient-name {
    font-weight: bold;
    color: var(--mint-green);
    font-style: normal;
}

/* ===================================
CHECKLISTS, PROGRESS, QUIZ
=================================== */
.checklist {
    background: var(--bg-dark-tertiary);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: 0.7rem;
    margin: var(--spacing-md) 0;
}
.checklist h4 {
    color: var(--mint-green);
    margin-bottom: 0.65rem;
    font-size: 1.23rem;
}
.checklist ul {
    list-style: none;
    padding-left: 0;
}
.checklist li {
    padding: 0.5rem 0 0.5rem 1.7rem;
    position: relative;
}
.checklist li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--mint-green);
    font-weight: 800;
}

.progress-bar {
    background: var(--bg-dark-secondary);
    height: 10px;
    border-radius: 4px;
    overflow: hidden;
    margin-top: 1.3rem;
}
.progress-fill {
    background: var(--primary-purple-light);
    height: 100%;
    width: 0;
    transition: width 0.3s ease;
}

/* QUIZ BOX */
.interactive-quiz {
    background: rgba(88,108,217,0.14);
    border: 1.5px solid rgba(124,58,237,0.17);
    border-radius: 1.2rem;
    padding: var(--spacing-xl) var(--spacing-lg);
    margin: var(--spacing-xl) 0;
    box-shadow: var(--shadow-md);
}
.quiz-question {
    font-size: 1.2rem;
    margin-bottom: 1.2rem;
    color: var(--accent-blue-light);
}
.quiz-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}
.quiz-option {
    padding: 1rem 1.4rem;
    border: 2px solid rgba(124,58,237,0.15);
    border-radius: 0.8rem;
    background: transparent;
    color: var(--text-light);
    cursor: pointer;
    transition: border-color var(--transition-fast), background var(--transition-fast);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}
.quiz-option:hover,
.quiz-option.selected {
    border-color: var(--primary-purple-light);
    background: rgba(124, 58, 237, 0.12);
}

/* ===================================
FOOTER
=================================== */
.footer {
    background: var(--bg-dark-tertiary);
    color: var(--lavender-soft);
    padding: var(--spacing-xl) var(--spacing-lg);
    text-align: center;
    margin-top: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    border-top-left-radius: 1vw;
    border-top-right-radius: 1vw;
}
.footer h3 {
    color: var(--primary-purple-light);
    margin-bottom: var(--spacing-md);
}

/* ===================================
RESPONSIVE DESIGN
=================================== */
@media (max-width: 1150px) {
    .content-section {
        max-width: 100vw;
        padding: 0 var(--spacing-lg);
    }
    .card, .interactive-quiz, .patient-story, .checklist {
        padding-left: var(--spacing-md);
        padding-right: var(--spacing-md);
    }
}
@media (max-width: 900px) {
    .card, .interactive-quiz, .patient-story, .checklist {
        padding-left: var(--spacing-sm);
        padding-right: var(--spacing-sm);
    }
    .hero-section, .footer {
        padding-left: var(--spacing-sm);
        padding-right: var(--spacing-sm);
    }
    .stat-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
}
@media (max-width: 700px) {
    .hero-section, .footer {
        padding: var(--spacing-lg) var(--spacing-xs);
    }
    .content-section {
        padding: 0 var(--spacing-sm);
    }
    .section-title {
        font-size: 1.4rem;
    }
}

/* ===================================
ACCESSIBILITY
=================================== */
:focus-visible {
    outline: 2px solid var(--accent-blue-light);
    outline-offset: 3px;
}
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}