/* Modern PKI Consultant Website Styles */

:root {
    /* Colors - Tech Theme */
    --primary: #4f46e5;
    --primary-dark: #4338ca;
    --secondary: #06b6d4;
    --accent: #8b5cf6;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    
    /* Neutrals */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    /* Background */
    --bg-primary: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    --bg-secondary: #ffffff;
    --bg-dark: #0f172a;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* Spacing */
    --container-max: 1200px;
    --section-padding: 5rem 0;
    
    /* 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);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
}

/* Dark Theme Variables */
.dark-theme {
    --primary: #6366f1;
    --primary-dark: #8b5cf6;
    --gray-50: #0f172a;
    --gray-100: #1e293b;
    --gray-200: #334155;
    --gray-300: #475569;
    --gray-400: #64748b;
    --gray-500: #94a3b8;
    --gray-600: #cbd5e1;
    --gray-700: #e2e8f0;
    --gray-800: #f1f5f9;
    --gray-900: #f8fafc;
    --bg-primary: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    --bg-secondary: #1e293b;
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 100%;
}

body {
    font-family: var(--font-primary);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--gray-800);
    background: var(--bg-primary);
    overflow-x: hidden;
}

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

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

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

ul {
    list-style: none;
}

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Navigation */
.nav {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--gray-200);
    transition: var(--transition);
}

.nav.scrolled {
    box-shadow: var(--shadow-lg);
}

.nav__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1.5rem;
}

.nav__logo {
    font-weight: 700;
    font-size: 1.35rem;
    color: var(--gray-900);
}

.nav__menu {
    display: flex;
    gap: 2rem;
}

.nav__link {
    position: relative;
    padding: 0.4rem 0;
    font-weight: 500;
    color: var(--gray-700);
}

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

.nav__link:hover::after,
.nav__link.active::after {
    width: 100%;
}

.nav__controls {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.theme-toggle {
    background: none;
    border: none;
    font-size: 1.4rem;
    cursor: pointer;
    padding: 0.4rem;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.theme-toggle:hover {
    background: var(--gray-100);
}

.dark-theme .theme-toggle:hover {
    background: var(--gray-700);
}

/* Language Selector */
.lang-selector {
    position: relative;
}

.lang-selector__btn {
    background: none;
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-md);
    padding: 0.5rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
}

.lang-selector__btn:hover {
    border-color: var(--primary);
    background: var(--gray-50);
}

.lang-selector__btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.lang-selector__btn .icon {
    font-size: 1.2rem;
}

.lang-selector__dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 0.5rem;
    background: var(--bg-secondary);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    min-width: 120px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition);
    z-index: 1001;
}

.lang-selector.open .lang-selector__dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-selector__option {
    padding: 0.75rem 1rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 500;
}

.lang-selector__option:hover {
    background: var(--gray-100);
}

.lang-selector__option.active {
    background: var(--primary);
    color: white;
}

.lang-selector__option:first-child {
    border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.lang-selector__option:last-child {
    border-radius: 0 0 var(--radius-md) var(--radius-md);
}

/* Mobile Toggle */
.mobile-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--gray-700);
}

@media (max-width: 768px) {
    .nav__menu {
        display: none;
    }
    
    .mobile-toggle {
        display: block;
    }
    
    .nav__controls .lang-selector {
        display: none;
    }
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 6rem 0 4rem;
    position: relative;
    overflow: hidden;
}

.hero__bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(rgba(79, 70, 229, 0.08) 1px, transparent 1px),
                linear-gradient(90deg, rgba(79, 70, 229, 0.08) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: grid 30s linear infinite;
}

@keyframes grid {
    0% { transform: translate(0, 0); }
    100% { transform: translate(50px, 50px); }
}

.hero__grid {
    display: grid;
    grid-template-columns: 1fr;
    position: relative;
    z-index: 1;
}

@media (min-width: 768px) {
    .hero__grid {
        grid-template-columns: 1fr 1fr;
        gap: 4rem;
        align-items: center;
    }
}

.hero__photo-wrap {
    text-align: center;
    margin-bottom: 2rem;
}

.hero__photo {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    object-fit: cover;
    border: 5px solid #fff;
    box-shadow: var(--shadow-xl);
    transition: transform 0.4s;
}

.hero__photo:hover {
    transform: scale(1.05);
}

.hero__title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 0.5rem;
}

.hero__subtitle {
    font-size: 1.25rem;
    color: var(--gray-600);
    margin-bottom: 1rem;
}

.hero__desc {
    font-size: 1.125rem;
    color: var(--gray-700);
    margin-bottom: 2rem;
    line-height: 1.7;
}

.hero__btns {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
}

@media (min-width: 768px) {
    .hero__btns {
        justify-content: flex-start;
    }
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 2rem;
    border-radius: var(--radius-lg);
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

/* Terminal Card */
.terminal {
    margin-top: 1rem;
    max-width: 42s0px;
    background: var(--gray-800);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.terminal__header {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.5rem;
    background: var(--gray-700);
    color: var(--gray-300);
    border-bottom: 1px solid var(--gray-600);
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot-red { background: #ff5f57; }
.dot-yellow { background: #ffbd2e; }
.dot-green { background: #28ca42; }

.terminal__body {
    padding: 1.5rem;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--gray-300);
    background: var(--gray-800);
    min-height: 280px;
    position: relative;
}

.type-line {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    margin-bottom: 0.5rem;
}

.prompt {
    color: #10b981;
    font-weight: 500;
}

.command {
    color: var(--gray-300);
}

.cursor {
    width: 8px;
    height: 1.2em;
    background: #10b981;
    animation: blink 1s infinite;
    display: inline-block;
    margin-left: 2px;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

/* Mobile Menu */
.mobile-menu {
    display: none;
    position: fixed;
    inset: 0;
    background: var(--bg-secondary);
    z-index: 999;
    padding: 6rem 2rem 2rem;
    overflow-y: auto;
    transform: translateX(100%);
    transition: transform 0.3s ease;
}

.mobile-menu.open {
    transform: translateX(0);
}

.mobile-menu__close {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    font-size: 2rem;
    cursor: pointer;
    background: none;
    border: none;
    color: var(--gray-700);
    z-index: 1001;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.mobile-menu__close:hover {
    background: var(--gray-100);
}

.mobile-menu ul {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    font-size: 1.2rem;
    margin-bottom: 2rem;
}

.mobile-menu__lang {
    position: absolute;
    bottom: 2rem;
    left: 2rem;
    right: 2rem;
    display: flex;
    gap: 1rem;
    justify-content: center;
    padding-top: 2rem;
    border-top: 1px solid var(--gray-200);
}

.mobile-menu__lang .lang-btn {
    flex: 1;
    max-width: 120px;
    padding: 1rem 0.5rem;
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-lg);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    background: var(--bg-secondary);
    color: var(--gray-700);
    font-size: 1rem;
}

.mobile-menu__lang .lang-btn:hover {
    border-color: var(--primary);
    background: var(--gray-50);
    transform: translateY(-2px);
}

.mobile-menu__lang .lang-btn.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
}

.dark-theme .mobile-menu {
    background: var(--gray-100);
}

.dark-theme .mobile-menu__close {
    color: var(--gray-300);
}

.dark-theme .mobile-menu__close:hover {
    background: var(--gray-700);
}

.dark-theme .mobile-menu__lang {
    border-top-color: var(--gray-700);
}

.dark-theme .mobile-menu__lang .lang-btn {
    background: var(--gray-100);
    border-color: var(--gray-600);
    color: var(--gray-300);
}

.dark-theme .mobile-menu__lang .lang-btn:hover {
    background: var(--gray-200);
    border-color: var(--primary);
}

.dark-theme .mobile-menu__lang .lang-btn.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* Section Common */
.section {
    padding: 5rem 0;
    background: var(--bg-secondary);
}

.section__title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: 1rem;
    color: var(--gray-900);
}

.section__subtitle {
    max-width: 600px;
    margin: auto auto 3rem;
    text-align: center;
    color: var(--gray-600);
}

/* About Section */
.about-text {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--gray-700);
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

/* Timeline */
.timeline {
    position: relative;
    max-width: 900px;
    margin: auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(var(--primary), var(--accent));
    transform: translateX(-50%);
    border-radius: 2px;
}

.timeline__item {
    position: relative;
    margin: 3rem 0;
    display: flex;
    justify-content: center;
    align-items: center;
}

.timeline__marker {
    position: absolute;
    left: 50%;
    width: 20px;
    height: 20px;
    background: var(--primary);
    border: 4px solid #fff;
    border-radius: 50%;
    transform: translateX(-50%);
    box-shadow: var(--shadow-md);
    z-index: 1;
}

.timeline__content {
    width: 45%;
    background: #fff;
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
}

.timeline__content:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
}

.timeline__item:nth-child(odd) .timeline__content {
    margin-right: auto;
}

.timeline__item:nth-child(even) .timeline__content {
    margin-left: auto;
}

.timeline-company {
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.timeline-date {
    color: var(--gray-500);
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

/* Skills Grid */
.skills__grid {
    display: grid;
    gap: 2rem;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.skill-card {
    background: #fff;
    padding: 2.5rem;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
    transition: var(--transition);
}

.skill-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
}

.skill-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-2xl);
}

.skill-card h3 {
    font-size: 1.5rem;
    margin: 1rem 0 0.5rem;
    color: var(--gray-900);
}

.skill-card ul li {
    position: relative;
    padding-left: 1.5rem;
    color: var(--gray-700);
}

.skill-card ul li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: bold;
}

/* Blog Grid */
.blog__grid {
    display: grid;
    gap: 2rem;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
}

.blog-card {
    background: #fff;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
    cursor: pointer;
}

.blog-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-2xl);
    border-color: var(--primary);
}

.blog-card img {
    width: 100%;
    height: 180px;
    object-fit: cover;
}

.blog-card__body {
    padding: 1.5rem;
}

.blog-card__meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
    color: var(--gray-500);
    font-size: 0.875rem;
}

.blog-tag {
    background: var(--gray-100);
    padding: 0.2rem 0.6rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
}

.blog-card h3 {
    font-size: 1.25rem;
    margin: 0.5rem 0;
    line-height: 1.4;
    color: var(--gray-900);
}

.read-more {
    color: var(--primary);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    transition: var(--transition);
}

.read-more:hover {
    gap: 0.8rem;
}

/* Contact Links */
.contact__links {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
    max-width: 400px;
    margin: auto;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 2rem;
    background: #fff;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    width: 100%;
    justify-content: center;
    transition: var(--transition);
}

.contact-link:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: var(--primary);
}

/* Footer */
/* .footer {
    background: var(--gray-900);
    color: var(--gray-300);
    text-align: center;
    padding: 2rem 0;
    font-size: 0.9rem;
} */

/* Enhanced Footer with Dark Theme Support */
.footer {
    background: var(--gray-900);
    color: var(--gray-300);
    text-align: center;
    padding: 3rem 0 2rem;
    font-size: 0.875rem;
    margin-top: 4rem;
    border-top: 1px solid var(--gray-200);
}

.footer__content {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 1.5rem;
}

.footer__links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 2rem;
    margin-bottom: 1.5rem;
}

.footer__link {
    color: var(--gray-400);
    font-weight: 500;
    transition: var(--transition);
}

.footer__link:hover {
    color: var(--primary);
}

.footer__copyright {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--gray-200);
    color: var(--gray-500);
}

/* Dark theme specific adjustments */
.dark-theme .footer {
    background: var(--gray-100);
    color: var(--gray-600);
}

.dark-theme .footer__link {
    color: var(--gray-500);
}

/* Dark Mode */
.dark-theme .nav {
    background: rgba(15, 23, 42, 0.95);
    border-color: var(--gray-700);
}

.dark-theme .nav__logo {
    color: #6366f1;
}

.dark-theme .nav__link {
    color: var(--gray-300);
}

.dark-theme .skill-card,
.dark-theme .timeline__content,
.dark-theme .blog-card {
    background: var(--gray-100);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.dark-theme .skill-card:hover,
.dark-theme .timeline__content:hover,
.dark-theme .blog-card:hover {
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4);
}

/* Scroll Progress */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    z-index: 9999;
    transition: width 0.1s ease;
}

/* Skip Link */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    padding: 0.5rem 1rem;
    background: var(--primary);
    color: #fff;
    border-radius: var(--radius-md);
    z-index: 10000;
    transition: top 0.3s;
}

.skip-link:focus {
    top: 6px;
}

/* Responsive Timeline */
@media (max-width: 768px) {
    .timeline::before {
        left: 30px;
    }
    
    .timeline__item {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .timeline__marker {
        left: 30px;
        transform: translateX(-50%);
    }
    
    .timeline__content {
        width: calc(100% - 60px);
        margin-left: 60px;
    }
}

/* Blog Post Specific Styles */
.blog-post-header {
    padding: 2rem 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--gray-200);
    margin-bottom: 2rem;
}

.blog-post-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    color: var(--gray-500);
    font-size: 0.9rem;
}

.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--primary);
    color: white;
    border-radius: var(--radius-lg);
    font-weight: 600;
    margin-bottom: 2rem;
    transition: var(--transition);
}

.back-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: white;
}

.blog-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 2rem;
}

.blog-content h3 {
    margin: 2rem 0 1rem;
    color: var(--gray-900);
    font-size: 1.5rem;
}

.blog-content p {
    margin-bottom: 1rem;
    line-height: 1.7;
}

.blog-content ul {
    margin: 1rem 0 1.5rem;
    padding-left: 2rem;
}

.blog-content li {
    margin-bottom: 0.5rem;
}

/* AOS Animations */
[data-aos="fade-up"] {
    opacity: 0;
    transform: translateY(30px);
    transition: var(--transition-slow);
}

[data-aos="fade-up"].aos-animate {
    opacity: 1;
    transform: translateY(0);
}

[data-aos="fade-right"] {
    opacity: 0;
    transform: translateX(-30px);
    transition: var(--transition-slow);
}

[data-aos="fade-right"].aos-animate {
    opacity: 1;
    transform: translateX(0);
}

[data-aos="fade-left"] {
    opacity: 0;
    transform: translateX(30px);
    transition: var(--transition-slow);
}

[data-aos="fade-left"].aos-animate {
    opacity: 1;
    transform: translateX(0);
}