/**
 * Leadership Clinic - Stylesheet
 * INSEAD Lifelong Learning Style
 */

/* ============================================
   CSS Variables
   ============================================ */
:root {
    /* INSEAD Brand Colours */
    --insead-green: #00574F;
    --insead-green-dark: #003D37;
    --insead-green-light: #007A6E;

    /* Accent Colours */
    --accent-gold: #C4A35A;
    --accent-teal: #29E1EC;

    /* Neutral Colours */
    --white: #FFFFFF;
    --off-white: #F8F9FA;
    --light-grey: #E9ECEF;
    --mid-grey: #6C757D;
    --dark-grey: #343A40;
    --black: #212529;

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-serif: 'Georgia', 'Times New Roman', serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 5rem;

    /* Container */
    --container-max: 1200px;
    --container-narrow: 800px;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
}

/* ============================================
   Reset & Base Styles
   ============================================ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--black);
    background-color: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    color: var(--insead-green);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--insead-green-light);
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    color: var(--insead-green-dark);
    margin-bottom: var(--spacing-sm);
}

h1 {
    font-size: 2.75rem;
    font-weight: 700;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.5rem;
}

h4 {
    font-size: 1.25rem;
}

p {
    margin-bottom: var(--spacing-sm);
}

.lead {
    font-size: 1.25rem;
    line-height: 1.7;
    color: var(--mid-grey);
}

.text-center {
    text-align: center;
}

/* ============================================
   Layout
   ============================================ */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.container-narrow {
    max-width: var(--container-narrow);
}

.section {
    padding: var(--spacing-xxl) 0;
}

.section-alt {
    background-color: var(--off-white);
}

/* ============================================
   Header & Navigation
   ============================================ */
.header {
    background-color: var(--white);
    border-bottom: 1px solid var(--light-grey);
    padding: var(--spacing-sm) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo img {
    height: auto;
    width: auto;
}

.logo .logo-main {
    height: 45px;
}

.logo .logo-insead {
    height: 40px;
    padding-left: var(--spacing-md);
    border-left: 1px solid var(--light-grey);
}

.logo-text {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--insead-green);
}

.nav-cta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    font-family: var(--font-primary);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border: 2px solid transparent;
    border-radius: 4px;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.btn-primary {
    background-color: var(--insead-green);
    color: var(--white);
    border-color: var(--insead-green);
}

.btn-primary:hover {
    background-color: var(--insead-green-dark);
    border-color: var(--insead-green-dark);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: transparent;
    color: var(--insead-green);
    border-color: var(--insead-green);
}

.btn-secondary:hover {
    background-color: var(--insead-green);
    color: var(--white);
}

.btn-lg {
    padding: 1.125rem 2.5rem;
    font-size: 1.125rem;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    background: linear-gradient(135deg, var(--insead-green) 0%, var(--insead-green-dark) 100%);
    color: var(--white);
    padding: var(--spacing-xxl) 0;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="40" fill="none" stroke="rgba(255,255,255,0.05)" stroke-width="0.5"/><circle cx="50" cy="50" r="30" fill="none" stroke="rgba(255,255,255,0.05)" stroke-width="0.5"/><circle cx="50" cy="50" r="20" fill="none" stroke="rgba(255,255,255,0.05)" stroke-width="0.5"/></svg>') no-repeat center center;
    background-size: cover;
    opacity: 0.5;
}

.hero-content {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xxl);
    align-items: center;
}

.hero h1 {
    color: var(--white);
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.hero .lead {
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-lg);
}

.hero-badge {
    display: inline-block;
    background-color: rgba(255, 255, 255, 0.15);
    color: var(--white);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: var(--spacing-md);
    backdrop-filter: blur(10px);
}

.hero-image {
    position: relative;
}

.hero-image img {
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
}

.hero-image-caption {
    position: absolute;
    bottom: -1rem;
    left: var(--spacing-md);
    right: var(--spacing-md);
    background-color: var(--white);
    color: var(--black);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 4px;
    box-shadow: var(--shadow-md);
    font-size: 0.875rem;
}

.hero-image-caption strong {
    display: block;
    color: var(--insead-green);
}

/* ============================================
   Programme Overview
   ============================================ */
.overview-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-xxl);
    align-items: start;
}

.overview-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.stat-card {
    background-color: var(--white);
    padding: var(--spacing-lg);
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    text-align: center;
    border: 1px solid var(--light-grey);
}

.stat-card .number {
    font-size: clamp(1.25rem, 4vw, 2.5rem);
    font-weight: 700;
    color: var(--insead-green);
    line-height: 1;
    margin-bottom: var(--spacing-xs);
}

.stat-card .label {
    font-size: 0.875rem;
    color: var(--mid-grey);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ============================================
   Ask Prof. Hellwig Section
   ============================================ */
.ask-hellwig-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: stretch;
}

.chat-container {
    background-color: var(--white);
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--light-grey);
    overflow: hidden;
    min-height: 450px;
    display: flex;
    flex-direction: column;
}

.chat-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex: 1;
    color: var(--mid-grey);
    background-color: var(--off-white);
}

.chat-placeholder-icon {
    color: var(--insead-green-light);
    margin-bottom: var(--spacing-md);
    opacity: 0.6;
}

.chat-placeholder p {
    font-size: 0.9375rem;
    margin-bottom: 0;
}

.chat-instructions {
    padding: var(--spacing-lg);
    background-color: var(--white);
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--light-grey);
}

.chat-instructions h3 {
    color: var(--insead-green);
    margin-bottom: var(--spacing-md);
}

.chat-instructions p {
    color: var(--dark-grey);
    line-height: 1.7;
}

.instructions-list {
    list-style: none;
    padding: 0;
    margin: var(--spacing-md) 0;
}

.instructions-list li {
    position: relative;
    padding-left: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    color: var(--dark-grey);
    line-height: 1.6;
}

.instructions-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.5rem;
    width: 8px;
    height: 8px;
    background-color: var(--insead-green-light);
    border-radius: 50%;
}

.instructions-list li strong {
    color: var(--insead-green-dark);
}

.instructions-note {
    font-size: 0.9375rem;
    color: var(--mid-grey);
    font-style: italic;
    margin-bottom: 0;
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--light-grey);
}

/* ============================================
   Modules Section
   ============================================ */
.modules-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.module-card {
    background-color: var(--white);
    padding: var(--spacing-lg);
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--light-grey);
    transition: all var(--transition-normal);
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.module-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--insead-green-light);
}

.module-number {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--insead-green) 0%, var(--insead-green-light) 100%);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.25rem;
}

.module-content h4 {
    margin-bottom: var(--spacing-xs);
    color: var(--insead-green-dark);
}

.module-content p {
    color: var(--mid-grey);
    font-size: 0.9375rem;
    margin-bottom: 0;
}

/* ============================================
   Faculty Section
   ============================================ */
.faculty-card {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: var(--spacing-xl);
    align-items: start;
    background-color: var(--white);
    padding: var(--spacing-xl);
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--light-grey);
}

.faculty-image {
    border-radius: 8px;
    overflow: hidden;
}

.faculty-image img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
}

.faculty-info h3 {
    color: var(--insead-green);
    margin-bottom: var(--spacing-xs);
}

.faculty-title {
    color: var(--mid-grey);
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
}

.faculty-bio {
    color: var(--dark-grey);
    line-height: 1.7;
}

/* ============================================
   CTA Section
   ============================================ */
.cta-section {
    background: linear-gradient(135deg, var(--insead-green) 0%, var(--insead-green-dark) 100%);
    color: var(--white);
    text-align: center;
    padding: var(--spacing-xxl) 0;
}

.cta-section h2 {
    color: var(--white);
    margin-bottom: var(--spacing-sm);
}

.cta-section p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-lg);
}

.cta-section .btn-primary {
    background-color: var(--white);
    color: var(--insead-green);
    border-color: var(--white);
}

.cta-section .btn-primary:hover {
    background-color: var(--off-white);
    border-color: var(--off-white);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background-color: var(--dark-grey);
    color: var(--white);
    padding: var(--spacing-xl) 0;
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-logo img {
    height: 40px;
    width: auto;
}

.footer-text {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.875rem;
}

.footer-links {
    display: flex;
    gap: var(--spacing-md);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.875rem;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--white);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-image {
        order: -1;
        max-width: 400px;
        margin: 0 auto;
    }

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

    .overview-stats {
        order: -1;
    }

    .ask-hellwig-grid {
        grid-template-columns: 1fr;
    }

    .chat-container {
        order: 2;
    }

    .chat-instructions {
        order: 1;
    }

    .faculty-card {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .faculty-image {
        max-width: 250px;
        margin: 0 auto;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 15px;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.75rem;
    }

    .hero {
        padding: var(--spacing-xl) 0;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero .lead {
        font-size: 1.1rem;
    }

    .hero-content {
        text-align: center;
    }

    .section {
        padding: var(--spacing-xl) 0;
    }

    .overview-stats {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .footer-inner {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }

    .header-inner {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .logo {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .logo .logo-main {
        height: 35px;
    }

    .logo .logo-insead {
        height: 30px;
        padding-left: 0;
        border-left: none;
    }

    .nav-cta {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }

    h1 {
        font-size: 1.75rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    .hero {
        padding: var(--spacing-xl) 0;
    }

    .hero h1 {
        font-size: 1.75rem;
    }

    .hero .lead {
        font-size: 1rem;
    }

    .hero-badge {
        font-size: 0.75rem;
        padding: 0.375rem 0.75rem;
    }

    .hero-image {
        max-width: 280px;
    }

    .hero-image-caption {
        font-size: 0.75rem;
        padding: var(--spacing-xs) var(--spacing-sm);
        left: var(--spacing-sm);
        right: var(--spacing-sm);
    }

    .btn {
        padding: 0.75rem 1.5rem;
        width: 100%;
        font-size: 0.9375rem;
    }

    .btn-lg {
        padding: 0.875rem 1.75rem;
    }

    .lead {
        font-size: 1rem;
    }

    .overview-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-sm);
    }

    .stat-card {
        padding: var(--spacing-sm);
    }

    .stat-card .number {
        font-size: 1.25rem;
    }

    .stat-card .label {
        font-size: 0.75rem;
    }

    .module-card {
        flex-direction: column;
        text-align: center;
        padding: var(--spacing-md);
    }

    .module-number {
        margin: 0 auto;
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }

    .module-content h4 {
        font-size: 1rem;
    }

    .module-content p {
        font-size: 0.875rem;
    }

    .chat-container {
        min-height: 350px;
    }

    .chat-instructions {
        padding: var(--spacing-md);
    }

    .instructions-list li {
        font-size: 0.9375rem;
    }

    .faculty-card {
        padding: var(--spacing-md);
    }

    .faculty-image {
        max-width: 200px;
    }

    .faculty-bio p {
        font-size: 0.9375rem;
    }

    .cta-section {
        padding: var(--spacing-xl) 0;
    }

    .cta-section p {
        font-size: 1rem;
    }

    .footer-logo img {
        height: 30px;
    }

    .footer-text {
        font-size: 0.75rem;
    }

    .footer-links {
        flex-direction: column;
        gap: var(--spacing-xs);
    }

    .footer-links a {
        font-size: 0.75rem;
    }
}

/* ============================================
   Utilities
   ============================================ */
.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;
}

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }