/* ============================================
   SRIDHAR VEMBU TRIBUTE WEBSITE
   Design System: Copper & Slate + Editorial
   ============================================ */

/* CSS Variables */
:root {
    /* Colors - Copper & Slate Palette */
    --color-primary: #B87333;
    --color-primary-light: #D4A574;
    --color-primary-dark: #8B5A2B;
    --color-slate: #2F3640;
    --color-slate-light: #4A5568;
    --color-slate-dark: #1A1D23;
    --color-cream: #F5F0EB;
    --color-cream-dark: #E8E0D5;
    --color-white: #FAFAFA;
    --color-black: #1A1A1A;
    
    /* Typography */
    --font-display: 'Playfair Display', Georgia, serif;
    --font-body: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2.5rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;
    --space-3xl: 8rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.4s ease;
    --transition-slow: 0.6s ease;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-md: 0 8px 24px rgba(0,0,0,0.12);
    --shadow-lg: 0 16px 48px rgba(0,0,0,0.15);
}

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

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

body {
    font-family: var(--font-body);
    font-weight: 400;
    line-height: 1.6;
    color: var(--color-slate);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* ============================================
   NAVIGATION
   ============================================ */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--space-md) 0;
    transition: var(--transition-medium);
}

.nav.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    padding: var(--space-sm) 0;
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.nav-logo {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-white);
    letter-spacing: -0.02em;
}

.nav.scrolled .nav-logo {
    color: var(--color-slate);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--space-lg);
}

.nav-links a {
    font-size: 0.875rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-white);
    opacity: 0.9;
    position: relative;
}

.nav.scrolled .nav-links a {
    color: var(--color-slate);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: var(--transition-medium);
}

.nav-links a:hover::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-white);
    transition: var(--transition-fast);
}

.nav.scrolled .nav-toggle span {
    background: var(--color-slate);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-slate-dark);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--color-slate-dark) 0%, var(--color-slate) 50%, var(--color-slate-light) 100%);
    opacity: 0.9;
}

.hero-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 30% 20%, rgba(184, 115, 51, 0.15) 0%, transparent 50%),
                radial-gradient(ellipse at 70% 80%, rgba(212, 165, 116, 0.1) 0%, transparent 50%);
}

.hero-content {
    position: relative;
    z-index: 10;
    text-align: center;
    max-width: 900px;
    padding: var(--space-xl);
    animation: fadeInUp 1s ease-out;
}

.hero-eyebrow {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--color-primary-light);
    margin-bottom: var(--space-md);
    padding: var(--space-xs) var(--space-md);
    border: 1px solid rgba(184, 115, 51, 0.3);
    border-radius: 100px;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(3rem, 10vw, 7rem);
    font-weight: 600;
    line-height: 0.95;
    color: var(--color-white);
    margin-bottom: var(--space-lg);
    letter-spacing: -0.03em;
}

.hero-line {
    display: block;
}

.hero-line:last-child {
    color: var(--color-primary-light);
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    font-weight: 300;
    color: rgba(255, 255, 255, 0.8);
    max-width: 600px;
    margin: 0 auto var(--space-xl);
    line-height: 1.7;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
    flex-wrap: wrap;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 600;
    color: var(--color-white);
    line-height: 1;
}

.stat-label {
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: rgba(255, 255, 255, 0.6);
    margin-top: var(--space-xs);
}

.hero-cta {
    display: inline-block;
    padding: var(--space-md) var(--space-xl);
    background: var(--color-primary);
    color: var(--color-white);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    border-radius: 4px;
    transition: var(--transition-medium);
    box-shadow: 0 4px 20px rgba(184, 115, 51, 0.3);
}

.hero-cta:hover {
    background: var(--color-primary-light);
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(184, 115, 51, 0.4);
}

.hero-scroll {
    position: absolute;
    bottom: var(--space-xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
}

.scroll-line {
    width: 1px;
    height: 60px;
    background: linear-gradient(to bottom, var(--color-primary), transparent);
    animation: scrollPulse 2s ease-in-out infinite;
}

/* ============================================
   SECTIONS
   ============================================ */
.section {
    padding: var(--space-3xl) 0;
    position: relative;
}

.section-dark {
    background: var(--color-slate-dark);
    color: var(--color-white);
}

.section-light {
    background: var(--color-cream);
    color: var(--color-slate);
}

.section-accent {
    background: var(--color-slate);
    color: var(--color-white);
}

.section-image {
    min-height: 80vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.section-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(47, 54, 64, 0.95), rgba(26, 29, 35, 0.9)),
                url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><rect fill="none" width="100" height="100"/><path fill="rgba(184,115,51,0.03)" d="M0 50 Q25 30 50 50 T100 50 L100 100 L0 100 Z"/></svg>');
    background-size: cover, 200px;
}

.section-header {
    margin-bottom: var(--space-2xl);
}

.section-header.centered {
    text-align: center;
}

.section-eyebrow {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--color-primary);
    margin-bottom: var(--space-sm);
}

.section-dark .section-eyebrow,
.section-accent .section-eyebrow {
    color: var(--color-primary-light);
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 600;
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: 1.125rem;
    font-weight: 300;
    color: var(--color-slate-light);
    margin-top: var(--space-md);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* ============================================
   TIMELINE
   ============================================ */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--color-primary), transparent);
}

.timeline-item {
    position: relative;
    padding-left: var(--space-xl);
    padding-bottom: var(--space-xl);
    opacity: 0;
    transform: translateX(-20px);
    transition: var(--transition-medium);
}

.timeline-item.visible {
    opacity: 1;
    transform: translateX(0);
}

.timeline-item::before {
    content: attr(data-year);
    position: absolute;
    left: -60px;
    top: 0;
    font-family: var(--font-display);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-primary-light);
    width: 50px;
    text-align: right;
}

.timeline-item::after {
    content: '';
    position: absolute;
    left: -5px;
    top: 8px;
    width: 12px;
    height: 12px;
    background: var(--color-primary);
    border-radius: 50%;
    box-shadow: 0 0 0 4px rgba(184, 115, 51, 0.2);
}

.timeline-content h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
    color: var(--color-white);
}

.timeline-content p {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.7;
}

/* ============================================
   ZOHO STORY CARDS
   ============================================ */
.zoho-story {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-2xl);
}

.story-card {
    background: var(--color-white);
    padding: var(--space-xl);
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-medium);
    position: relative;
    overflow: hidden;
}

.story-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--color-primary);
    transform: scaleX(0);
    transition: var(--transition-medium);
}

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

.story-card:hover::before {
    transform: scaleX(1);
}

.story-card.highlight {
    background: var(--color-slate);
    color: var(--color-white);
}

.story-card.highlight::before {
    background: var(--color-primary-light);
}

.story-year {
    font-family: var(--font-display);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--space-sm);
}

.story-card.highlight .story-year {
    color: var(--color-primary-light);
}

.story-card h3 {
    font-family: var(--font-display);
    font-size: 1.375rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
    line-height: 1.3;
}

.story-card p {
    font-size: 0.9375rem;
    color: var(--color-slate-light);
    line-height: 1.7;
}

.story-card.highlight p {
    color: rgba(255, 255, 255, 0.8);
}

/* Zoho Metrics */
.zoho-metrics {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-lg);
    text-align: center;
}

.metric {
    padding: var(--space-lg);
}

.metric-value {
    display: block;
    font-family: var(--font-display);
    font-size: clamp(1.5rem, 3vw, 2.5rem);
    font-weight: 600;
    color: var(--color-slate);
    line-height: 1;
    margin-bottom: var(--space-xs);
}

.metric-label {
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-slate-light);
}

/* ============================================
   PHILOSOPHY SECTION
   ============================================ */
.philosophy-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: var(--space-2xl);
    align-items: center;
}

.philosophy-content {
    max-width: 600px;
}

.philosophy-lead {
    font-size: 1.25rem;
    font-weight: 300;
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.7;
    margin-bottom: var(--space-xl);
}

.principles {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.principle {
    display: flex;
    gap: var(--space-md);
    align-items: flex-start;
}

.principle-icon {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-primary);
    min-width: 40px;
}

.principle-text h4 {
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--space-xs);
    color: var(--color-white);
}

.principle-text p {
    font-size: 0.9375rem;
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.6;
}

.philosophy-quote {
    background: rgba(255, 255, 255, 0.05);
    padding: var(--space-xl);
    border-radius: 8px;
    border-left: 4px solid var(--color-primary);
}

.philosophy-quote blockquote {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 400;
    font-style: italic;
    line-height: 1.5;
    color: var(--color-white);
    margin-bottom: var(--space-md);
}

.philosophy-quote cite {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-primary-light);
    font-style: normal;
}

/* ============================================
   IMPACT SECTION
   ============================================ */
.impact-content {
    position: relative;
    z-index: 10;
    max-width: 700px;
    color: var(--color-white);
}

.impact-content .section-eyebrow {
    color: var(--color-primary-light);
}

.impact-content .section-title {
    margin-bottom: var(--space-lg);
}

.impact-lead {
    font-size: 1.25rem;
    font-weight: 300;
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.7;
    margin-bottom: var(--space-xl);
}

.impact-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

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

.impact-number {
    display: block;
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 600;
    color: var(--color-primary-light);
    line-height: 1;
}

.impact-label {
    font-size: 0.8125rem;
    font-weight: 400;
    color: rgba(255, 255, 255, 0.7);
    margin-top: var(--space-xs);
}

.impact-text {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.7;
}

/* ============================================
   AWARDS SECTION
   ============================================ */
.awards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-lg);
}

.award-card {
    background: var(--color-white);
    padding: var(--space-xl);
    border-radius: 8px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-medium);
    border: 1px solid transparent;
}

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

.award-year {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-primary);
    margin-bottom: var(--space-sm);
}

.award-icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-sm);
}

.award-card h3 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
    color: var(--color-slate);
}

.award-card p {
    font-size: 0.9375rem;
    color: var(--color-slate-light);
    line-height: 1.6;
}

/* ============================================
   LEGACY SECTION
   ============================================ */
.legacy-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.legacy-content .section-eyebrow {
    color: var(--color-primary-light);
}

.legacy-content .section-title {
    color: var(--color-white);
    margin-bottom: var(--space-xl);
}

.legacy-text {
    font-size: 1.125rem;
    font-weight: 300;
    color: rgba(255, 255, 255, 0.85);
    line-height: 1.8;
    margin-bottom: var(--space-lg);
}

.legacy-cta {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    margin-top: var(--space-xl);
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: var(--space-md) var(--space-xl);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    border-radius: 4px;
    transition: var(--transition-medium);
}

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

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

.btn-secondary {
    background: transparent;
    color: var(--color-white);
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-secondary:hover {
    border-color: var(--color-white);
    background: rgba(255, 255, 255, 0.1);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background: var(--color-slate-dark);
    color: var(--color-white);
    padding: var(--space-xl) 0 var(--space-lg);
}

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

.footer-brand {
    max-width: 300px;
}

.footer-logo {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
    display: block;
    margin-bottom: var(--space-sm);
}

.footer-brand p {
    font-size: 0.9375rem;
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.6;
}

.footer-links {
    display: flex;
    gap: var(--space-lg);
}

.footer-links a {
    font-size: 0.875rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition-fast);
}

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

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

.footer-bottom p {
    font-size: 0.8125rem;
    color: rgba(255, 255, 255, 0.4);
}

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

@keyframes scrollPulse {
    0%, 100% {
        opacity: 0.3;
        transform: scaleY(0.8);
    }
    50% {
        opacity: 1;
        transform: scaleY(1);
    }
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 1024px) {
    .philosophy-grid {
        grid-template-columns: 1fr;
    }
    
    .zoho-metrics {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-white);
        flex-direction: column;
        padding: var(--space-lg);
        gap: var(--space-md);
        box-shadow: var(--shadow-md);
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .nav-links a {
        color: var(--color-slate);
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero-stats {
        gap: var(--space-lg);
    }
    
    .timeline::before {
        left: 20px;
    }
    
    .timeline-item {
        padding-left: 60px;
    }
    
    .timeline-item::before {
        left: -40px;
        font-size: 0.75rem;
    }
    
    .timeline-item::after {
        left: 15px;
    }
    
    .zoho-metrics {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-md);
    }
    
    .metric {
        padding: var(--space-md);
    }
    
    .impact-stats {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-links {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .section {
        padding: var(--space-2xl) 0;
    }
    
    .zoho-story {
        grid-template-columns: 1fr;
    }
    
    .zoho-metrics {
        grid-template-columns: 1fr;
    }
    
    .awards-grid {
        grid-template-columns: 1fr;
    }
    
    .legacy-cta {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        text-align: center;
    }
}