/* ==========================================================================
   CORPORATE E-PROFILE STYLESHEET
   Professional UI/UX Design - International Standards
   ========================================================================== */

/* ==========================================================================
   CSS VARIABLES & ROOT CONFIGURATION
   ========================================================================== */
:root {
    /* Color Palette - Corporate Professional */
    --primary-navy: #0f172a;
    --primary-blue: #1e40af;
    --accent-teal: #0d9488;
    --charcoal: #1f2937;
    --white: #ffffff;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-900: #111827;

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-heading: 'Poppins', sans-serif;

    /* Spacing System */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    /* Layout */
    --max-width: 1200px;
    --border-radius-sm: 8px;
    --border-radius-md: 12px;
    --border-radius-lg: 16px;
    --border-radius-xl: 24px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
}

/* Dark Mode Variables */
body.dark-mode {
    --white: #0f172a;
    --gray-50: #1e293b;
    --gray-100: #334155;
    --gray-200: #475569;
    --gray-600: #cbd5e1;
    --gray-700: #e2e8f0;
    --gray-900: #f1f5f9;
    --primary-navy: #f9fafb;
}

/* ==========================================================================
   RESET & BASE STYLES
   ========================================================================== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-primary);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--gray-900);
    background-color: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition-base), color var(--transition-base);
}

/* ==========================================================================
   TYPOGRAPHY
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.2;
    color: var(--gray-900);
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 3vw, 1.75rem); }

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

a {
    color: var(--primary-blue);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--accent-teal);
}

/* ==========================================================================
   LAYOUT & CONTAINERS
   ========================================================================== */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

section {
    padding: var(--spacing-3xl) 0;
}

/* ==========================================================================
   DARK MODE TOGGLE
   ========================================================================== */
.dark-mode-toggle {
    position: fixed;
    top: var(--spacing-md);
    right: var(--spacing-md);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--white);
    border: 2px solid var(--gray-200);
    box-shadow: var(--shadow-lg);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: var(--primary-navy);
    z-index: 1000;
    transition: all var(--transition-base);
}

.dark-mode-toggle:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-xl);
}

body.dark-mode .dark-mode-toggle i::before {
    content: "185"; /* Sun icon */
}

/* ==========================================================================
   CARD COMPONENTS
   ========================================================================== */
.card {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--gray-200);
    transition: all var(--transition-base);
}

.card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-4px);
}

/* ==========================================================================
   BUTTONS
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.875rem 1.75rem;
    font-family: var(--font-primary);
    font-size: 1rem;
    font-weight: 500;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    border: none;
    text-decoration: none;
}

.btn-primary {
    background: var(--primary-blue);
    color: var(--white);
    box-shadow: 0 4px 12px rgba(30, 64, 175, 0.3);
}

.btn-primary:hover {
    background: var(--accent-teal);
    box-shadow: 0 8px 20px rgba(13, 148, 136, 0.4);
    transform: translateY(-2px);
}

.btn-secondary {
    background: transparent;
    color: var(--primary-blue);
    border: 2px solid var(--primary-blue);
}

.btn-secondary:hover {
    background: var(--primary-blue);
    color: var(--white);
    transform: translateY(-2px);
}

/* ==========================================================================
   SECTION HEADERS
   ========================================================================== */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-tag {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--gray-100);
    color: var(--primary-blue);
    border-radius: var(--border-radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-sm);
}

.section-title {
    color: var(--gray-900);
    margin-bottom: var(--spacing-sm);
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--white) 100%);
    padding: var(--spacing-3xl) 0;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.hero-content {
    opacity: 0;
    animation: fadeInUp 1s ease-out forwards;
}

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
    from {
        opacity: 0;
        transform: translateY(30px);
    }
}

.hero-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--primary-blue);
    color: var(--white);
    border-radius: var(--border-radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.hero-name {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    color: var(--primary-navy);
    margin-bottom: var(--spacing-sm);
}

.hero-title {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    font-weight: 600;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-sm);
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--gray-600);
    margin-bottom: var(--spacing-lg);
}

.hero-cta {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

/* Hero Image */
.hero-image {
    position: relative;
    animation: fadeInRight 1s ease-out 0.3s backwards;
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.image-wrapper {
    position: relative;
    width: 100%;
    max-width: 450px;
    margin: 0 auto;
}

.profile-photo {
    width: 100%;
    height: auto;
    aspect-ratio: 1;
    object-fit: cover;
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-xl);
    border: 4px solid var(--white);
}

.image-decoration {
    position: absolute;
    top: -20px;
    right: -20px;
    width: 100%;
    height: 100%;
    border: 3px solid var(--primary-blue);
    border-radius: var(--border-radius-xl);
    z-index: -1;
}

/* Scroll Indicator */
.scroll-down {
    position: absolute;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--gray-600);
    font-size: 0.875rem;
    font-weight: 500;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

/* ==========================================================================
   ABOUT SECTION
   ========================================================================== */
.about {
    background: var(--white);
}

.about-card {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-xl);
}

.about-text {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--gray-700);
    margin-bottom: var(--spacing-md);
}

.about-text strong {
    color: var(--primary-navy);
    font-weight: 600;
}

/* ==========================================================================
   EXPERIENCE / STATS SECTION
   ========================================================================== */
.experience {
    background: var(--gray-50);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.stat-card {
    text-align: center;
    padding: var(--spacing-xl);
}

.stat-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--accent-teal) 100%);
    border-radius: var(--border-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--white);
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-navy);
    font-family: var(--font-heading);
    margin-bottom: var(--spacing-xs);
}

.stat-number::after {
    content: '+';
    color: var(--primary-blue);
}

.stat-label {
    font-size: 1rem;
    color: var(--gray-600);
    font-weight: 500;
}

/* ==========================================================================
   EDUCATION SECTION
   ========================================================================== */
.education {
    background: var(--white);
}

.education-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.education-card {
    text-align: center;
    padding: var(--spacing-xl);
}

.edu-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    background: var(--gray-100);
    border-radius: var(--border-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--primary-blue);
    transition: all var(--transition-base);
}

.education-card:hover .edu-icon {
    background: var(--primary-blue);
    color: var(--white);
    transform: scale(1.1);
}

.edu-title {
    font-size: 1.25rem;
    color: var(--gray-900);
    margin-bottom: var(--spacing-sm);
}

.edu-description {
    font-size: 0.9375rem;
    color: var(--gray-600);
    line-height: 1.6;
}

/* ==========================================================================
   EXPERTISE SECTION
   ========================================================================== */
.expertise {
    background: var(--gray-50);
}

.expertise-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.expertise-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
}

.expertise-icon {
    width: 60px;
    height: 60px;
    flex-shrink: 0;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--accent-teal) 100%);
    border-radius: var(--border-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--white);
    transition: transform var(--transition-base);
}

.expertise-card:hover .expertise-icon {
    transform: rotate(360deg) scale(1.1);
}

.expertise-title {
    font-size: 1.125rem;
    color: var(--gray-900);
    font-weight: 600;
}

/* ==========================================================================
   METHODOLOGY SECTION
   ========================================================================== */
.methodology {
    background: var(--white);
}

.methodology-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.method-card {
    position: relative;
    padding: var(--spacing-xl);
    text-align: center;
}

.method-number {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    font-size: 3rem;
    font-weight: 700;
    color: var(--gray-200);
    font-family: var(--font-heading);
    line-height: 1;
}

.method-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto var(--spacing-md);
    background: var(--primary-blue);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    color: var(--white);
}

.method-title {
    font-size: 1.25rem;
    color: var(--gray-900);
    margin-bottom: var(--spacing-xs);
}

.method-description {
    font-size: 0.9375rem;
    color: var(--gray-600);
    line-height: 1.6;
}

/* ==========================================================================
   INSTITUTE SECTION
   ========================================================================== */
.institute {
    background: var(--gray-50);
}

.institute-content {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-xl);
}

.institute-intro {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--gray-700);
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.institute-services {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.service-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--gray-50);
    border-radius: var(--border-radius-md);
    border-left: 4px solid var(--primary-blue);
    transition: all var(--transition-base);
}

.service-item:hover {
    background: var(--white);
    transform: translateX(8px);
}

.service-item i {
    font-size: 1.5rem;
    color: var(--accent-teal);
}

.service-item span {
    font-weight: 500;
    color: var(--gray-700);
}

/* ==========================================================================
   ENGAGEMENT SECTION
   ========================================================================== */
.engagement {
    background: var(--white);
}

.engagement-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.engagement-card {
    text-align: center;
    padding: var(--spacing-xl);
}

.engagement-card i {
    font-size: 3rem;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-md);
}

.engagement-card h3 {
    font-size: 1.25rem;
    color: var(--gray-900);
    margin-bottom: var(--spacing-sm);
}

.engagement-card p {
    font-size: 0.9375rem;
    color: var(--gray-600);
    line-height: 1.6;
}

.engagement-card:hover i {
    animation: iconBounce 0.6s ease;
}

@keyframes iconBounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

/* ==========================================================================
   CONTACT SECTION
   ========================================================================== */
.contact {
    background: var(--gray-50);
}

.contact-card {
    max-width: 700px;
    margin: 0 auto;
    padding: var(--spacing-xl);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
}

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

.contact-icon {
    width: 60px;
    height: 60px;
    flex-shrink: 0;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--accent-teal) 100%);
    border-radius: var(--border-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--white);
}

.contact-details h3 {
    font-size: 0.875rem;
    color: var(--gray-600);
    margin-bottom: 0.25rem;
    font-weight: 600;
    text-transform: uppercase;
}

.contact-details a {
    font-size: 1.125rem;
    color: var(--gray-900);
    font-weight: 600;
}

.contact-details a:hover {
    color: var(--primary-blue);
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.footer {
    background: var(--primary-navy);
    color: var(--white);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
    gap: var(--spacing-lg);
}

.footer-info h3 {
    color: var(--white);
    margin-bottom: var(--spacing-xs);
}

.footer-info p {
    color: var(--gray-300);
    margin-bottom: 0.25rem;
}

.footer-location {
    font-size: 0.875rem;
}

.footer-social {
    display: flex;
    gap: var(--spacing-sm);
}

.social-link {
    width: 45px;
    height: 45px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1.125rem;
    transition: all var(--transition-base);
}

.social-link:hover {
    background: var(--primary-blue);
    transform: translateY(-4px);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: var(--gray-300);
    font-size: 0.875rem;
}

/* ==========================================================================
   SCROLL ANIMATIONS
   ========================================================================== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ==========================================================================
   RESPONSIVE DESIGN
   ========================================================================== */
@media (max-width: 968px) {
    :root {
        --spacing-3xl: 4rem;
    }

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

    .hero-cta {
        justify-content: center;
    }

    .image-wrapper {
        order: -1;
        max-width: 350px;
    }
}

@media (max-width: 768px) {
    .stats-grid,
    .education-grid,
    .expertise-grid,
    .methodology-grid,
    .engagement-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }

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

    .hero-cta {
        flex-direction: column;
        width: 100%;
    }

    .dark-mode-toggle {
        width: 45px;
        height: 45px;
    }
}