/* M. Akshan CSO Portfolio — Clean Minimal Design
   Based on Ahamed Shafeek Design System */

/* =============================
   Design Tokens
============================= */
:root {
    --bg: #FFFFFF;
    --bg-alt: #FAFAFA;
    --text: #1A1A1A;
    --muted: #6B7280;
    --border: #E5E7EB;
    --hover-bg: #F5F5F5;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.1);

    --primary: #EA580C;
    --primary-600: #C2410C;
    --secondary: #2563EB;
    --secondary-600: #1E40AF;

    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', Helvetica, Arial, sans-serif;

    --radius-sm: 6px;
    --radius: 8px;
    --radius-lg: 12px;

    --container: 1120px;
    --section-y: 80px;
    --gap-sm: 12px;
    --gap: 20px;
    --gap-lg: 32px;

    --transition: 0.15s ease;
}

/* =============================
   Accessibility
============================= */
.skip-to-content {
    position: absolute;
    top: -100px;
    left: 0;
    background: var(--primary);
    color: white;
    padding: 12px 20px;
    text-decoration: none;
    font-weight: 600;
    z-index: 10000;
    border-radius: 0 0 var(--radius) 0;
    transition: top 0.3s ease;
}

.skip-to-content:focus {
    top: 0;
    outline: 3px solid var(--secondary);
    outline-offset: 2px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    color: var(--text);
    background: var(--bg);
    font-size: 16px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

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

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

a:hover {
    color: var(--primary);
}

.container {
    width: 100%;
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 24px;
}

@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }
}

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

@media (max-width: 768px) {
    .section {
        padding: 48px 0;
    }
}

h1,
h2,
h3,
h4 {
    line-height: 1.3;
    font-weight: 600;
    margin: 0 0 12px;
}

h1 {
    font-size: 48px;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 32px;
}

h3 {
    font-size: 24px;
}

h4 {
    font-size: 18px;
}

@media (max-width: 768px) {
    h1 {
        font-size: 36px;
    }

    h2 {
        font-size: 28px;
    }

    h3 {
        font-size: 22px;
    }
}

p {
    margin: 0 0 16px;
    opacity: 0.87;
    max-width: 70ch;
}

.muted {
    color: var(--muted);
    opacity: 1;
}

.label {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--muted);
    margin-bottom: 8px;
}

.label-light {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 8px;
}

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

.mt-1 {
    margin-top: 16px;
}

.mt-2 {
    margin-top: 32px;
}

.mb-2 {
    margin-bottom: 32px;
}

.bg-alt {
    background: var(--bg-alt);
}

/* =============================
   Navigation
============================= */
.nav-wrapper {
    padding: 16px 24px;
    position: sticky;
    top: 0;
    z-index: 1000;
}

@media (max-width: 768px) {
    .nav-wrapper {
        padding: 12px 16px;
    }
}

.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 8px 12px;
    box-shadow: var(--shadow-lg);
    max-width: var(--container);
    margin: 0 auto;
}

.nav-brand {
    font-weight: 700;
    font-size: 18px;
    padding: 0 12px;
    color: var(--primary);
}

.nav-brand a {
    color: var(--primary);
}

.nav-links {
    display: flex;
    gap: 4px;
    flex-grow: 1;
    justify-content: center;
}

.nav-links a {
    padding: 8px 16px;
    border-radius: var(--radius);
    color: var(--text);
    font-size: 15px;
    font-weight: 500;
}

.nav-links a:hover {
    background: var(--hover-bg);
    color: var(--primary);
}

.nav-links a.active {
    font-weight: 600;
}

.nav-actions {
    display: flex;
    gap: 8px;
}

.burger {
    display: none;
    padding: 12px 16px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--bg);
    cursor: pointer;
    font-size: 15px;
    font-weight: 600;
    min-height: 44px;
}

@media (max-width: 900px) {
    .nav-links {
        display: none;
    }

    .nav-actions {
        display: none;
    }

    .burger {
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .nav-links.mobile-open {
        display: flex;
        flex-direction: column;
        position: fixed;
        top: 0;
        right: 0;
        width: 280px;
        height: 100vh;
        background: var(--bg);
        border-left: 1px solid var(--border);
        box-shadow: var(--shadow-lg);
        padding: 80px 20px 20px;
        gap: 8px;
        z-index: 1000;
    }

    .nav-links.mobile-open a {
        padding: 14px 20px;
        font-size: 16px;
    }
}

/* =============================
   Buttons
============================= */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    border-radius: 999px;
    font-weight: 600;
    font-size: 15px;
    border: 1px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    min-height: 44px;
    justify-content: center;
}

@media (max-width: 768px) {
    .btn {
        padding: 14px 24px;
        font-size: 16px;
        width: 100%;
    }
}

.btn-dark {
    background: var(--text);
    color: var(--bg);
}

.btn-dark:hover {
    background: #333;
}

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

.btn-primary:hover {
    background: var(--primary-600);
}

.btn-secondary {
    background: var(--secondary);
    color: #fff;
}

.btn-secondary:hover {
    background: var(--secondary-600);
}

.btn-outline {
    background: var(--bg);
    color: var(--text);
    border-color: var(--border);
}

.btn-outline:hover {
    background: var(--hover-bg);
    border-color: var(--text);
}

.btn-primary-light {
    background: #fff;
    color: var(--primary);
}

.btn-primary-light:hover {
    background: rgba(255, 255, 255, 0.9);
}

.btn-outline-light {
    background: transparent;
    color: #fff;
    border-color: rgba(255, 255, 255, 0.3);
}

.btn-outline-light:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: #fff;
}

/* =============================
   Hero
============================= */
.hero {
    padding: 60px 0 48px;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: var(--gap-lg);
    align-items: center;
}

@media (max-width: 900px) {
    .hero {
        padding: 32px 0 24px;
    }

    .hero-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
}

.hero .title {
    margin-bottom: 16px;
    color: var(--text);
}

.hero .intro {
    color: var(--muted);
    max-width: 560px;
    margin-bottom: 24px;
    font-size: 17px;
    line-height: 1.7;
}

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

@media (max-width: 768px) {
    .hero .cta-row {
        flex-direction: column;
        gap: 12px;
    }
}

.portrait-wrap {
    display: flex;
    justify-content: center;
    align-items: center;
}

.portrait {
    width: 100%;
    max-width: 400px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.portrait img {
    width: 100%;
    height: auto;
    object-fit: cover;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--gap-sm);
    margin-top: 32px;
}

.hero-grid>.hero-stats {
    grid-column: 1 / -1;
}

@media (max-width: 768px) {
    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
        margin-top: 24px;
    }
}

.stat {
    padding: 16px;
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: var(--transition);
    text-align: center;
}

.stat:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
}

.stat strong {
    display: block;
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 4px;
}

.stat small {
    display: block;
    color: var(--muted);
    font-size: 13px;
}

/* =============================
   Feature Cards
============================= */
.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--gap);
}

@media (max-width: 900px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .features-grid {
        grid-template-columns: 1fr;
    }
}

.feature-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    transition: var(--transition);
}

.feature-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow);
}

.feature-icon {
    font-size: 28px;
    margin-bottom: 12px;
}

.feature-card h4 {
    margin-bottom: 8px;
    font-weight: 600;
}

.feature-card p {
    color: var(--muted);
    font-size: 14px;
    margin: 0;
}

/* =============================
   Cards Grid
============================= */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--gap);
}

@media (max-width: 900px) {
    .cards-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .cards-grid {
        grid-template-columns: 1fr;
    }
}

.card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    transition: var(--transition);
}

.card:hover {
    border-color: var(--muted);
    box-shadow: var(--shadow);
}

.card-header {
    margin-bottom: 16px;
}

.card h3 {
    font-size: 20px;
    margin-bottom: 8px;
}

.card p {
    color: var(--muted);
    font-size: 15px;
    margin-bottom: 16px;
}

.venture-badge {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    color: var(--primary);
    background: rgba(234, 88, 12, 0.1);
    padding: 4px 10px;
    border-radius: 20px;
    margin-bottom: 8px;
}

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

.feature-list li {
    padding: 6px 0;
    font-size: 14px;
    color: var(--muted);
}

.actions {
    margin-top: 20px;
    display: flex;
    gap: var(--gap-sm);
    flex-wrap: wrap;
}

/* =============================
   Content Split
============================= */
.content-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--gap-lg);
    align-items: start;
}

@media (max-width: 768px) {
    .content-split {
        grid-template-columns: 1fr;
        gap: 24px;
    }
}

/* =============================
   Achievement Grid
============================= */
.achievement-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--gap);
}

@media (max-width: 900px) {
    .achievement-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .achievement-grid {
        grid-template-columns: 1fr;
    }
}

.achievement-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    transition: var(--transition);
}

.achievement-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow);
}

.achievement-icon {
    font-size: 32px;
    margin-bottom: 16px;
}

.achievement-card h4 {
    margin-bottom: 8px;
    color: var(--text);
}

.achievement-card p {
    color: var(--muted);
    font-size: 14px;
    margin: 0;
}

/* =============================
   Timeline
============================= */
.timeline-container {
    max-width: 700px;
    margin: 0 auto;
    position: relative;
    padding-left: 40px;
}

.timeline-container::before {
    content: '';
    position: absolute;
    left: 15px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border);
}

.timeline-item {
    position: relative;
    padding-bottom: 32px;
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-marker {
    position: absolute;
    left: -33px;
    top: 6px;
    width: 14px;
    height: 14px;
    background: var(--primary);
    border-radius: 50%;
    border: 3px solid var(--bg);
    box-shadow: 0 0 0 3px var(--primary);
}

.timeline-content {
    background: var(--bg);
    padding: 20px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: var(--transition);
    text-align: left;
}

.timeline-content:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow);
}

.timeline-content h4 {
    margin-bottom: 4px;
    color: var(--text);
}

.timeline-date {
    font-size: 12px;
    font-weight: 600;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 12px;
    display: block;
}

.timeline-content p {
    color: var(--muted);
    font-size: 14px;
    margin: 0;
}

/* =============================
   CTA Section
============================= */
.bg-gradient {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-600) 100%);
    color: #fff;
}

.cta-section {
    text-align: center;
    padding: 20px 0;
}

.cta-premium .cta-content {
    max-width: 700px;
    margin: 0 auto 32px;
}

.cta-premium h2 {
    color: #fff;
    margin-bottom: 16px;
}

.cta-premium p {
    color: rgba(255, 255, 255, 0.9);
    max-width: 600px;
    margin: 0 auto 24px;
}

.cta-stats {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-top: 24px;
    flex-wrap: wrap;
}

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

.cta-stat strong {
    display: block;
    font-size: 28px;
    font-weight: 700;
    color: #fff;
}

.cta-stat small {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.8);
}

.cta-section .actions {
    justify-content: center;
}

/* =============================
   Contact Grid
============================= */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--gap);
}

@media (max-width: 900px) {
    .contact-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .contact-grid {
        grid-template-columns: 1fr;
    }
}

.contact-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    transition: var(--transition);
    text-align: center;
    display: block;
}

.contact-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow);
    color: var(--text);
}

.contact-icon {
    font-size: 32px;
    margin-bottom: 12px;
}

.contact-card h4 {
    margin-bottom: 8px;
    color: var(--text);
}

.contact-card p {
    color: var(--muted);
    font-size: 14px;
    margin-bottom: 12px;
}

.contact-link {
    font-size: 13px;
    font-weight: 600;
    color: var(--primary);
}

/* =============================
   Footer
============================= */
.footer {
    background: var(--text);
    color: #fff;
    padding: 48px 0 24px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--gap-lg);
    margin-bottom: 32px;
}

@media (max-width: 768px) {
    .footer-content {
        grid-template-columns: 1fr;
        gap: 24px;
    }
}

.footer-col h4 {
    color: #fff;
    margin-bottom: 16px;
    font-size: 16px;
}

.footer-col p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
}

.footer-col a {
    display: block;
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
    padding: 4px 0;
    transition: var(--transition);
}

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 24px;
    text-align: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.6);
    font-size: 13px;
    margin: 0;
}

/* =============================
   Back to Top
============================= */
#backToTop {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 999px;
    padding: 12px 16px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
}

#backToTop.visible {
    opacity: 1;
    visibility: visible;
}

#backToTop:hover {
    background: var(--primary-600);
}