/* ==========================================================================
   Sadman A Prodhan - Stark Minimalist Design System (Light / Dark Theme Support)
   ========================================================================== */

/* --------------------------------------------------------------------------
   Theme Variables - Default Dark & Light Switchers
   -------------------------------------------------------------------------- */
:root, [data-theme="dark"] {
    --bg-deep: #050505;           /* stark carbon black */
    --bg-surface: #0a0a0a;        /* velvet charcoal black */
    --bg-surface-hover: #101010;
    --border-color: rgba(255, 255, 255, 0.05);
    --border-hover: #ff3333;
    
    --text-bright: #ffffff;       /* pristine white */
    --text-muted: #888888;        /* silver grey */
    --text-dim: #444444;          /* dark slate grey */
    --accent-primary: #ff3333;    /* high-contrast crimson red */
    --accent-glow: rgba(255, 51, 51, 0.03);
    --header-bg: rgba(5, 5, 5, 0.85);
}

[data-theme="light"] {
    --bg-deep: #f9f9f9;           /* clean minimalist white */
    --bg-surface: #ffffff;        /* pure white card */
    --bg-surface-hover: #f1f1f1;  /* light silver */
    --border-color: rgba(0, 0, 0, 0.06);
    --border-hover: #ff3333;
    
    --text-bright: #111111;       /* deep ink black */
    --text-muted: #666666;        /* charcoal grey */
    --text-dim: #aaaaaa;          /* light silver grey */
    --accent-primary: #ff3333;    /* high-contrast crimson red */
    --accent-glow: rgba(255, 51, 51, 0.015);
    --header-bg: rgba(249, 249, 249, 0.85);
}

/* --------------------------------------------------------------------------
   Reset & Base Stylings
   -------------------------------------------------------------------------- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    scroll-behavior: smooth;
    transition: background-color 0.4s ease, border-color 0.4s ease, color 0.2s ease;
}

body {
    background-color: var(--bg-deep);
    color: var(--text-muted);
    font-family: 'Inter', sans-serif;
    line-height: 1.8;
    font-size: 16px;
    overflow-x: hidden;
    position: relative;
    -webkit-font-smoothing: antialiased;
}

/* Scrollbars */
::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: var(--bg-deep);
}
::-webkit-scrollbar-thumb {
    background: var(--border-color);
}
::-webkit-scrollbar-thumb:hover {
    background: var(--accent-primary);
}

h1, h2, h3, h4, h5, h6 {
    color: var(--text-bright);
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.04em;
}

a {
    color: inherit;
    text-decoration: none;
}

/* Background Ambient Spotlight Glows (Controlled Opacity) */
.ambient-glow {
    position: absolute;
    width: 35vw;
    height: 35vw;
    max-width: 450px;
    max-height: 450px;
    border-radius: 50%;
    filter: blur(140px);
    opacity: 0.03;
    pointer-events: none;
    z-index: -2;
}
.glow-1 {
    top: 5%;
    left: -5%;
    background: var(--accent-primary);
}
.glow-2 {
    top: 45%;
    right: -5%;
    background: var(--accent-primary);
}
.glow-3 {
    bottom: 5%;
    left: 15%;
    background: var(--accent-primary);
}

/* --------------------------------------------------------------------------
   Layout & Typography Utilities
   -------------------------------------------------------------------------- */
.container {
    max-width: 1000px; /* narrowed down further for clean readability */
    margin: 0 auto;
    padding: 0 25px;
    width: 100%;
}

.section {
    padding: var(--spacing-section) 0;
    position: relative;
    border-bottom: 1px solid var(--border-color);
}

.section:last-of-type {
    border-bottom: none;
}

:root {
    --spacing-section: 120px;
    --border-radius-lg: 2px; /* sharp geometry borders */
    --border-radius-md: 1px;
    --border-radius-sm: 0px;
    --transition-smooth: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.text-gradient {
    color: var(--text-bright);
}

.accent-gradient {
    color: var(--accent-primary) !important;
}

.section-title-wrapper {
    margin-bottom: 60px;
}

.section-label {
    display: inline-block;
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.25em;
    color: var(--accent-primary);
    margin-bottom: 15px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -0.04em;
    margin-bottom: 12px;
}

.section-desc {
    font-size: 1.05rem;
    color: var(--text-muted);
    font-weight: 300;
}

/* --------------------------------------------------------------------------
   Minimal Stark Cards (No Shadows, Sharp Borders)
   -------------------------------------------------------------------------- */
.glass-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 35px;
    position: relative;
}

.glass-card:hover {
    border-color: var(--border-hover);
    background: var(--bg-surface-hover);
}

/* Clean Minimalist Typography Blocks */
.quote-mark {
    font-family: 'Outfit', sans-serif;
    font-size: 9rem;
    font-weight: 900;
    line-height: 0;
    position: absolute;
    top: 25px;
    left: 10px;
    opacity: 0.02;
    color: var(--accent-primary);
    pointer-events: none;
}

.about-quote {
    font-family: 'Outfit', sans-serif;
    font-size: 1.9rem;
    font-weight: 500;
    line-height: 1.45;
    color: var(--text-bright);
    margin-bottom: 25px;
}

.about-quote span {
    border-bottom: 1px solid var(--accent-primary);
}

/* Stark Buttons (Outline First) */
.btn-cta {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: var(--accent-primary);
    color: #ffffff !important;
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: 12px 26px;
    border-radius: var(--border-radius-md);
    border: 1px solid var(--accent-primary);
}

.btn-cta:hover {
    background: transparent;
    color: var(--accent-primary) !important;
    transform: translateY(-2px);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-bright);
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: 12px 26px;
    border-radius: var(--border-radius-md);
}

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

/* Grids */
.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

/* --------------------------------------------------------------------------
   Header Navigation
   -------------------------------------------------------------------------- */
#main-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 20px 0;
    background: transparent;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: none;
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), background-color 0.3s;
}

#main-header.nav-hidden {
    transform: translateY(-100%);
}

#main-header.scrolled {
    background: var(--header-bg);
    border-bottom: none;
}

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

.logo {
    font-family: 'Outfit', sans-serif;
    font-weight: 900;
    font-size: 1.5rem;
    color: var(--text-bright);
    letter-spacing: -0.04em;
}

.logo span {
    color: var(--accent-primary);
}

.nav-menu ul {
    display: flex;
    gap: 25px;
    list-style: none;
}

.nav-link {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--text-muted);
    padding: 4px 0;
    position: relative;
    display: flex;
    align-items: center;
    gap: 6px;
}

.nav-link i {
    font-size: 0.65rem;
    opacity: 0.4;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--accent-primary);
    transition: var(--transition-smooth);
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-bright);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 15px;
}

/* Minimal Theme Switcher Toggle */
.theme-toggle-btn {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-bright);
    cursor: pointer;
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius-md);
    font-size: 0.95rem;
}

.theme-toggle-btn:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.theme-toggle-btn .fa-sun {
    display: none;
}

[data-theme="light"] .theme-toggle-btn .fa-moon {
    display: none;
}

[data-theme="light"] .theme-toggle-btn .fa-sun {
    display: block;
}

.mobile-nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
}

.mobile-nav-toggle .bar {
    display: block;
    width: 20px;
    height: 1px;
    background-color: var(--text-bright);
    margin: 5px auto;
    transition: var(--transition-smooth);
}

/* --------------------------------------------------------------------------
   Hero Space (Motivational & Core Manifestos)
   -------------------------------------------------------------------------- */
#hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: 100px;
}

.hero-wrapper {
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: calc(100vh - 100px);
}

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--accent-glow);
    border: 1px solid var(--border-color);
    padding: 5px 12px;
    color: var(--accent-primary);
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.7rem;
    font-weight: 500;
    margin-bottom: 25px;
    align-self: flex-start;
}

.status-badge .ping {
    width: 5px;
    height: 5px;
    background: var(--accent-primary);
    border-radius: 50%;
    position: relative;
}

.status-badge .ping::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--accent-primary);
    border-radius: 50%;
    animation: ping 1.5s infinite;
}

@keyframes ping {
    0% { transform: scale(1); opacity: 1; }
    100% { transform: scale(2.5); opacity: 0; }
}

.hero-title-group h1 {
    font-size: 5rem;
    line-height: 0.95;
    font-weight: 900;
    letter-spacing: -0.05em;
    margin-bottom: 20px;
}

.hero-subtitle {
    font-family: 'Outfit', sans-serif;
    font-size: 1.8rem;
    font-weight: 500;
    color: var(--text-bright);
    margin-bottom: 25px;
}

.hero-para {
    font-size: 1.15rem;
    max-width: 600px;
    color: var(--text-muted);
    margin-bottom: 40px;
    font-weight: 300;
}

.hero-buttons {
    display: flex;
    gap: 15px;
}

/* Clean Manifesto Styling (Home Page Content) */
.manifesto-container {
    display: flex;
    flex-direction: column;
    gap: 30px;
    margin-top: 40px;
}

.manifesto-item {
    border-top: 1px solid var(--border-color);
    padding-top: 25px;
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 30px;
}

.manifesto-label {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--accent-primary);
}

.manifesto-content h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
    letter-spacing: -0.02em;
}

.manifesto-content p {
    font-size: 0.95rem;
    color: var(--text-muted);
    font-weight: 300;
}

/* Mouse Wheel */
.scroll-indicator {
    position: absolute;
    bottom: 25px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    color: var(--text-dim);
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.65rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

.scroll-indicator .mouse {
    width: 16px;
    height: 26px;
    border: 1px solid var(--text-dim);
    border-radius: 8px;
    position: relative;
}

.scroll-indicator .wheel {
    width: 2px;
    height: 5px;
    background-color: var(--accent-primary);
    position: absolute;
    top: 5px;
    left: 50%;
    transform: translateX(-50%);
    animation: scrollWheel 2s infinite;
}

@keyframes scrollWheel {
    0% { top: 5px; opacity: 1; }
    50% { top: 15px; opacity: 0; }
    100% { top: 5px; opacity: 1; }
}

/* --------------------------------------------------------------------------
   About Narrative & Stats
   -------------------------------------------------------------------------- */
.about-narrative p {
    font-size: 1.05rem;
    color: var(--text-muted);
    margin-bottom: 20px;
    font-weight: 300;
}

.about-stats {
    display: flex;
    gap: 35px;
    margin-top: 30px;
    border-top: 1px solid var(--border-color);
    padding-top: 30px;
}

.stat-item h4 {
    font-size: 2rem;
    font-weight: 800;
    color: var(--accent-primary);
    margin-bottom: 3px;
}

.stat-item p {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-dim);
}

/* --------------------------------------------------------------------------
   Ventures List
   -------------------------------------------------------------------------- */
.ventures-container {
    display: flex;
    flex-direction: column;
    gap: 35px;
}

.venture-card {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 30px;
    align-items: flex-start;
}

.venture-meta {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.venture-date {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.75rem;
    color: var(--accent-primary);
    font-weight: 600;
}

.venture-meta h3 {
    font-size: 2rem;
    font-weight: 800;
}

.venture-role {
    font-size: 0.95rem;
    color: var(--text-bright);
    font-weight: 500;
}

.venture-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.75rem;
    color: var(--accent-primary);
    font-weight: 600;
    margin-top: 6px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.venture-link:hover {
    color: var(--text-bright);
    gap: 10px;
}

.venture-body {
    display: flex;
    flex-direction: column;
    gap: 15px;
    border-left: 1px solid var(--border-color);
    padding-left: 35px;
}

.venture-desc {
    font-size: 1.05rem;
    color: var(--text-muted);
    font-weight: 300;
}

.venture-bullets {
    list-style: none;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.venture-bullets li {
    font-size: 0.85rem;
    position: relative;
    padding-left: 15px;
    color: var(--text-muted);
}

.venture-bullets li::before {
    content: '—';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
}

/* --------------------------------------------------------------------------
   Skills tab switcher
   -------------------------------------------------------------------------- */
.skills-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 50px;
}

.skills-nav {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.skills-tab-btn {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    font-family: 'Outfit', sans-serif;
    font-size: 0.95rem;
    font-weight: 600;
    text-align: left;
    padding: 16px 20px;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.skills-tab-btn i {
    font-size: 0.75rem;
    opacity: 0.3;
}

.skills-tab-btn:hover {
    border-color: var(--text-dim);
    color: var(--text-bright);
}

.skills-tab-btn.active {
    background: var(--accent-glow);
    border-color: var(--accent-primary);
    color: var(--text-bright);
}

.skills-tab-btn.active i {
    transform: translateX(3px);
    color: var(--accent-primary);
    opacity: 1;
}

.skills-panel {
    display: none;
    animation: fadeIn 0.4s ease;
}

.skills-panel.active {
    display: block;
}

.skills-panel-desc {
    font-size: 1.05rem;
    color: var(--text-muted);
    margin-bottom: 30px;
    font-weight: 300;
}

.skills-grid-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.skill-interactive-card {
    background: var(--bg-deep);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 22px;
}

.skill-interactive-card:hover {
    border-color: var(--accent-primary);
}

.skill-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.skill-icon-box {
    width: 38px;
    height: 38px;
    border-radius: var(--border-radius-sm);
    background: var(--accent-glow);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-primary);
    font-size: 1rem;
}

.skill-badge {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.65rem;
    background: var(--bg-surface);
    padding: 3px 8px;
    border-radius: 0px;
    color: var(--text-muted);
    border: 1px solid var(--border-color);
}

.skill-interactive-card h4 {
    font-size: 1.1rem;
    margin-bottom: 6px;
}

.skill-interactive-card p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   Milestones & TIMELINE
   -------------------------------------------------------------------------- */
.timeline {
    position: relative;
    max-width: 750px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 1px;
    height: 100%;
    background: linear-gradient(to bottom, var(--accent-primary) 0%, var(--border-color) 100%);
    top: 0;
}

.timeline-item {
    width: 100%;
    margin-bottom: 40px;
    position: relative;
}

.timeline-item:nth-child(even) {
    text-align: right;
}

.timeline-dot {
    width: 10px;
    height: 10px;
    background: var(--bg-deep);
    border: 2px solid var(--accent-primary);
    border-radius: 50%;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    top: 28px;
    z-index: 10;
}

.timeline-content {
    width: 45%;
    position: relative;
    padding: 22px;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
}

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

.timeline-item:nth-child(odd) .timeline-content {
    margin-left: auto;
}

.timeline-date {
    display: inline-block;
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.75rem;
    color: var(--accent-primary);
    font-weight: 600;
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.timeline-content h3 {
    font-size: 1.3rem;
    margin-bottom: 4px;
}

.timeline-institution {
    font-size: 0.9rem;
    color: var(--text-bright);
    margin-bottom: 10px;
    font-weight: 500;
}

.timeline-desc {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 300;
}

/* --------------------------------------------------------------------------
   Contact Panel
   -------------------------------------------------------------------------- */
.contact-layout {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 40px;
}

.contact-info-panel {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.contact-pitch {
    font-size: 1.1rem;
    color: var(--text-muted);
    font-weight: 300;
}

.contact-cards-wrapper {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.contact-info-card {
    display: flex;
    align-items: center;
    gap: 15px;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    padding: 15px 20px;
    border-radius: var(--border-radius-md);
}

.contact-info-card:hover {
    border-color: var(--accent-primary);
}

.contact-icon {
    width: 38px;
    height: 38px;
    background: var(--accent-glow);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-primary);
    font-size: 1rem;
}

.contact-info-card:hover .contact-icon {
    background: var(--accent-primary);
    color: #ffffff;
}

.contact-details h4 {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-dim);
    margin-bottom: 2px;
}

.contact-details p,
.contact-details a {
    font-size: 0.95rem;
    color: var(--text-bright);
    font-weight: 500;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.form-group label {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
}

.form-input {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 12px 16px;
    color: var(--text-bright);
    font-family: 'Inter', sans-serif;
    font-size: 0.85rem;
}

.form-input:focus {
    outline: none;
    border-color: var(--accent-primary);
}

textarea.form-input {
    resize: none;
    min-height: 120px;
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
#main-footer {
    background: var(--bg-deep);
    border-top: 1px solid var(--border-color);
    padding: 60px 0 30px 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 50px;
    margin-bottom: 40px;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.footer-tagline {
    font-size: 0.95rem;
    color: var(--text-muted);
    max-width: 350px;
    font-style: italic;
    font-weight: 300;
}

.footer-socials {
    display: flex;
    gap: 10px;
}

.footer-socials a {
    width: 34px;
    height: 34px;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.footer-socials a:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.footer-links-col h4 {
    font-size: 0.85rem;
    margin-bottom: 15px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-bright);
}

.footer-links-col ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer-links-col a {
    color: var(--text-muted);
    font-size: 0.85rem;
    font-weight: 300;
}

.footer-links-col a:hover {
    color: var(--accent-primary);
    padding-left: 3px;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border-color);
    padding-top: 25px;
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.75rem;
    color: var(--text-dim);
}

.back-to-top {
    width: 34px;
    height: 34px;
    background: transparent;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 0.75rem;
}

.back-to-top:hover {
    background: var(--accent-primary);
    color: #ffffff;
    border-color: transparent;
    transform: translateY(-3px);
}

/* --------------------------------------------------------------------------
   Responsive Adaptations
   -------------------------------------------------------------------------- */
@media (max-width: 991px) {
    :root {
        --spacing-section: 80px;
    }
    
    .grid-2 {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .timeline::before, .timeline-dot {
        left: 0;
    }
    .timeline-content {
        width: calc(100% - 20px);
        margin-left: 20px !important;
    }
    .timeline-item:nth-child(even) {
        text-align: left;
    }
    
    .ventures-container {
        gap: 40px;
    }
    
    .venture-card {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .venture-body {
        border-left: none;
        padding-left: 0;
    }
    
    .skills-layout {
        grid-template-columns: 1fr;
        gap: 25px;
    }
    
    .contact-layout {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-section: 85px;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .grid-2, .grid-3 {
        grid-template-columns: 1fr !important;
        gap: 30px;
    }
    
    .about-stats {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    .venture-card {
        grid-template-columns: 1fr !important;
        gap: 20px;
    }
    
    .venture-body {
        border-left: none;
        padding-left: 0;
        border-top: 1px solid var(--border-color);
        padding-top: 25px;
    }
    
    .venture-bullets {
        grid-template-columns: 1fr !important;
    }
    
    .skills-layout {
        grid-template-columns: 1fr !important;
        gap: 35px;
    }
    
    .skills-nav {
        flex-direction: column;
        gap: 10px;
    }
    
    .skills-tab-btn {
        justify-content: center;
    }
    
    .hero-title-group h1 {
        font-size: 3.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.3rem;
    }
    
    .hero-para {
        font-size: 1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        gap: 10px;
    }
    
    .btn-cta, .btn-secondary {
        width: 100%;
        justify-content: center;
    }
    
    .mobile-nav-toggle {
        display: none !important;
    }
    
    .header-actions .btn-cta {
        display: none !important;
    }
    
    #main-header {
        position: fixed !important;
        top: auto !important;
        bottom: calc(35px + env(safe-area-inset-bottom, 0px)) !important;
        left: 50% !important;
        transform: translateX(-50%) !important;
        width: calc(100% - 40px) !important;
        max-width: 380px !important;
        height: 60px !important;
        padding: 0 16px !important;
        border-radius: 30px !important;
        background: rgba(10, 10, 10, 0.75) !important;
        backdrop-filter: blur(20px) !important;
        -webkit-backdrop-filter: blur(20px) !important;
        border: 1px solid rgba(255, 255, 255, 0.08) !important;
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3) !important;
        z-index: 99999 !important;
        display: flex !important;
        align-items: center !important;
        justify-content: center !important;
        transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.4s !important;
        overflow: visible !important;
    }
    
    [data-theme="light"] #main-header {
        background: rgba(255, 255, 255, 0.8) !important;
        border-color: rgba(0, 0, 0, 0.06) !important;
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.06) !important;
    }
    
    #main-header.nav-hidden {
        transform: translate(-50%, 120px) !important;
    }
    
    .header-container {
        width: 100% !important;
        display: flex !important;
        justify-content: space-between !important;
        align-items: center !important;
        padding: 0 !important;
    }
    
    .logo-brand {
        display: flex !important;
        align-items: center !important;
        padding: 0 !important;
        margin: 0 !important;
    }
    
    .logo-brand .logo-icon {
        width: 26px !important;
        height: 26px !important;
    }
    
    .header-actions {
        display: flex !important;
        align-items: center !important;
        gap: 0 !important;
    }
    
    .theme-toggle-btn {
        width: 32px !important;
        height: 32px !important;
        font-size: 0.95rem !important;
        display: flex !important;
        align-items: center !important;
        justify-content: center !important;
    }
    
    .nav-menu {
        position: static !important;
        transform: none !important;
        width: auto !important;
        height: auto !important;
        background: transparent !important;
        backdrop-filter: none !important;
        -webkit-backdrop-filter: none !important;
        border: none !important;
        box-shadow: none !important;
        display: block !important;
        padding: 0 !important;
        flex: 1 !important;
        margin: 0 10px !important;
    }
    
    .nav-menu ul {
        flex-direction: row !important;
        justify-content: space-around !important;
        align-items: center !important;
        width: 100% !important;
        gap: 0 !important;
        margin: 0 !important;
        padding: 0 !important;
        list-style: none !important;
    }
    
    .nav-menu li {
        flex: 1 !important;
        display: flex !important;
        justify-content: center !important;
    }
    
    .nav-link {
        display: flex !important;
        flex-direction: column !important;
        align-items: center !important;
        gap: 2px !important;
        font-size: 0.58rem !important;
        font-weight: 700 !important;
        text-transform: uppercase !important;
        letter-spacing: 0.04em !important;
        color: var(--text-muted) !important;
        padding: 2px 0 !important;
        transition: var(--transition-smooth) !important;
        width: 100% !important;
    }
    
    .nav-link::after {
        display: none !important;
    }
    
    .nav-link i {
        display: block !important;
        font-size: 1rem !important;
        opacity: 0.8 !important;
        transition: transform 0.3s !important;
    }
    
    .nav-link:hover,
    .nav-link.active {
        color: var(--accent-primary) !important;
    }
    
    .nav-link.active i {
        transform: translateY(-2px) !important;
        color: var(--accent-primary) !important;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    .manifesto-item {
        grid-template-columns: 1fr;
        gap: 10px;
    }
}

/* --------------------------------------------------------------------------
   Infinity S Logo Brand & Hover Animations
   -------------------------------------------------------------------------- */
.logo-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: 'Outfit', sans-serif;
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.04em;
    color: var(--text-bright);
    transition: var(--transition-smooth);
}

.logo-brand span {
    color: var(--text-bright);
}

.logo-icon {
    width: 32px;
    height: 32px;
    color: var(--accent-primary);
    transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.logo-brand:hover .logo-icon {
    transform: rotate(135deg);
}

/* --------------------------------------------------------------------------
   Minimal Stark Preloader Overlay
   -------------------------------------------------------------------------- */
#preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background-color: var(--bg-deep);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.6s;
    visibility: visible;
    opacity: 1;
}

#preloader.fade-out {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.preloader-wrapper {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.preloader-logo {
    width: 80px;
    height: 80px;
}

/* Beautiful SVG Path Self-Drawing Animation */
.preloader-path {
    stroke-dasharray: 200;
    stroke-dashoffset: 200;
    animation: drawPath 2.5s cubic-bezier(0.4, 0, 0.2, 1) infinite alternate;
}

.preloader-dot {
    animation: pulseDot 1s ease-in-out infinite alternate;
    transform-origin: center;
}

.preloader-text {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.3em;
    color: var(--text-bright);
    font-weight: 500;
    opacity: 0.8;
    margin-top: 10px;
    animation: fadeInOut 2s ease-in-out infinite;
}

@keyframes drawPath {
    0% {
        stroke-dashoffset: 200;
    }
    100% {
        stroke-dashoffset: 0;
    }
}

@keyframes pulseDot {
    0% {
        opacity: 0.4;
    }
    100% {
        opacity: 1;
    }
}

@keyframes fadeInOut {
    0%, 100% { opacity: 0.4; }
    50% { opacity: 0.9; }
}

/* --------------------------------------------------------------------------
   About Profile Image & Card Styling
   -------------------------------------------------------------------------- */
.about-image-container {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    width: 100%;
}

.about-image-card {
    position: relative;
    width: 100%;
    max-width: 400px;
    aspect-ratio: 4 / 5;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
    background: var(--bg-surface);
}

.profile-pic {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: grayscale(10%) contrast(102%);
    transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1), filter 0.6s;
}

.about-image-card:hover .profile-pic {
    transform: scale(1.03);
    filter: grayscale(0%) contrast(100%);
}

.profile-glow {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, transparent 70%, rgba(10, 10, 10, 0.6) 100%);
    pointer-events: none;
}

[data-theme="light"] .profile-glow {
    background: linear-gradient(180deg, transparent 70%, rgba(255, 255, 255, 0.4) 100%);
}