/* ===== CSS Variables ===== */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f7f9fc;
    --bg-card: #ffffff;
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a6a;
    --text-muted: #8888a0;
    --accent: #3b5998;
    --accent-light: #5a7bd5;
    --accent-bg: rgba(59, 89, 152, 0.08);
    --border: #e2e8f0;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
    --shadow-hover: 0 8px 32px rgba(0, 0, 0, 0.12);
    --radius: 12px;
    --nav-bg: rgba(255, 255, 255, 0.92);
    --tag-crm: #3b82f6;
    --tag-dev: #10b981;
    --tag-qa: #f59e0b;
    --tag-crm-bg: rgba(59, 130, 246, 0.1);
    --tag-dev-bg: rgba(16, 185, 129, 0.1);
    --tag-qa-bg: rgba(245, 158, 11, 0.1);
    --transition: 0.3s ease;
}

[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #1e293b;
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent: #60a5fa;
    --accent-light: #93bbfd;
    --accent-bg: rgba(96, 165, 250, 0.1);
    --border: #334155;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 8px 32px rgba(0, 0, 0, 0.5);
    --nav-bg: rgba(15, 23, 42, 0.92);
    --tag-crm-bg: rgba(59, 130, 246, 0.15);
    --tag-dev-bg: rgba(16, 185, 129, 0.15);
    --tag-qa-bg: rgba(245, 158, 11, 0.15);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 70px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color var(--transition), color var(--transition);
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

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

img { max-width: 100%; }

/* ===== Scroll Progress ===== */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--tag-crm), var(--tag-dev), var(--tag-qa));
    z-index: 10000;
    transition: width 0.1s linear;
    width: 0%;
}

/* ===== Navbar ===== */
.navbar {
    position: fixed;
    top: 3px;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--nav-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    transition: background var(--transition);
}

.nav-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}

.nav-logo {
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

.accent { color: var(--accent); }

.nav-menu {
    display: flex;
    list-style: none;
    gap: 0.25rem;
}

.nav-link {
    padding: 0.5rem 0.9rem;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: 8px;
    transition: all var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--accent);
    background: var(--accent-bg);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.lang-toggle {
    background: none;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0.4rem 0.7rem;
    cursor: pointer;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-secondary);
    transition: all var(--transition);
    font-family: inherit;
}

.lang-toggle:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.theme-toggle {
    background: none;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0.4rem 0.6rem;
    cursor: pointer;
    font-size: 1.1rem;
    color: var(--text-secondary);
    transition: all var(--transition);
}

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

[data-theme="light"] .theme-icon-dark { display: none; }
[data-theme="dark"] .theme-icon-light { display: none; }

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition);
}

/* ===== Hero ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.hero-particles {
    position: absolute;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
}

.hero-particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: var(--accent);
    border-radius: 50%;
    opacity: 0.15;
    animation: float-particle linear infinite;
}

@keyframes float-particle {
    0% { transform: translateY(100vh) rotate(0deg); opacity: 0; }
    10% { opacity: 0.15; }
    90% { opacity: 0.15; }
    100% { transform: translateY(-10vh) rotate(720deg); opacity: 0; }
}

.hero-content {
    text-align: center;
    position: relative;
    z-index: 2;
}

.hero-greeting {
    font-size: 1.1rem;
    color: var(--accent);
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
}

.hero-name {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    letter-spacing: -1px;
    margin-bottom: 0.75rem;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-typing {
    font-size: 1.3rem;
    margin-bottom: 1.25rem;
    min-height: 2rem;
    color: var(--text-secondary);
}

.typing-prefix { font-weight: 500; }

.typing-text {
    font-family: 'Fira Code', monospace;
    font-weight: 600;
    color: var(--accent);
}

.typing-cursor {
    font-weight: 300;
    animation: blink 1s step-end infinite;
    color: var(--accent);
}

@keyframes blink {
    50% { opacity: 0; }
}

.hero-desc {
    font-size: 1rem;
    color: var(--text-secondary);
    max-width: 520px;
    margin: 0 auto 2rem;
    line-height: 1.8;
}

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

/* ===== Buttons ===== */
.btn {
    padding: 0.7rem 1.8rem;
    border-radius: 8px;
    font-size: 0.92rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    border: none;
    display: inline-block;
    text-align: center;
    font-family: inherit;
}

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

.btn-primary:hover {
    background: var(--accent-light);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(59, 89, 152, 0.3);
}

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

.btn-outline:hover {
    background: var(--accent);
    color: #fff;
    transform: translateY(-2px);
}

/* Scroll Indicator */
.scroll-indicator {
    display: block;
    margin-top: 3rem;
    animation: bounce 2s ease infinite;
}

.scroll-arrow {
    display: inline-block;
    width: 24px;
    height: 24px;
    border-right: 2px solid var(--text-muted);
    border-bottom: 2px solid var(--text-muted);
    transform: rotate(45deg);
}

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

/* ===== Sections ===== */
.section {
    padding: 5rem 0;
}

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

.section-title {
    text-align: center;
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 3rem;
    letter-spacing: -0.5px;
    color: var(--text-primary);
}

.section-title::after {
    content: '';
    display: block;
    width: 50px;
    height: 3px;
    background: var(--accent);
    margin: 0.75rem auto 0;
    border-radius: 2px;
}

/* ===== About ===== */
.about-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 3rem;
    align-items: start;
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.8;
}

.about-text strong {
    color: var(--accent);
}

.about-cards {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.about-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    transition: all var(--transition);
}

.about-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
    border-color: var(--accent);
}

.about-card-icon {
    font-size: 1.8rem;
    flex-shrink: 0;
}

.about-card h3 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.about-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ===== Skills ===== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.skill-category {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    transition: all var(--transition);
}

.skill-category:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow);
}

.skill-category-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1.25rem;
}

.skill-cat-icon { font-size: 1.5rem; }

.skill-category-header h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
}

.skill-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
}

.skill-item {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.skill-name {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.skill-bar {
    width: 100%;
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    overflow: hidden;
}

.skill-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), var(--accent-light));
    border-radius: 3px;
    width: 0%;
    transition: width 1.2s ease;
}

.tool-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tool-badge {
    background: var(--accent-bg);
    color: var(--accent);
    padding: 0.35rem 0.75rem;
    border-radius: 6px;
    font-size: 0.82rem;
    font-weight: 500;
    transition: all var(--transition);
}

.tool-badge:hover {
    background: var(--accent);
    color: #fff;
}

/* ===== Projects ===== */
.filter-bar {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 2.5rem;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.5rem 1.4rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg-card);
    color: var(--text-secondary);
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    font-family: inherit;
}

.filter-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.filter-btn.active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: all 0.4s ease;
}

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

.project-card.hidden {
    display: none;
}

.project-card.fade-out {
    opacity: 0;
    transform: scale(0.95);
}

.project-card.fade-in {
    opacity: 1;
    transform: scale(1);
}

.card-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border);
}

.card-header.crm-bg { background: var(--tag-crm-bg); }
.card-header.dev-bg { background: var(--tag-dev-bg); }
.card-header.qa-bg { background: var(--tag-qa-bg); }

.card-tag {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    margin-bottom: 0.5rem;
}

.crm-bg .card-tag { background: var(--tag-crm); color: #fff; }
.dev-bg .card-tag { background: var(--tag-dev); color: #fff; }
.qa-bg .card-tag { background: var(--tag-qa); color: #fff; }

.card-header h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
}

.card-body {
    padding: 1.25rem 1.5rem;
}

.card-body > p {
    font-size: 0.88rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.card-meta {
    font-size: 0.82rem;
    color: var(--text-secondary);
    margin-bottom: 0.35rem;
    line-height: 1.5;
}

.meta-label {
    font-weight: 700;
    color: var(--text-primary);
    margin-right: 0.3rem;
}

.card-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-top: 1rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border);
}

.card-tech span {
    font-size: 0.72rem;
    font-weight: 600;
    padding: 0.2rem 0.55rem;
    border-radius: 4px;
    background: var(--bg-secondary);
    color: var(--text-muted);
    border: 1px solid var(--border);
}

/* ===== Timeline ===== */
.timeline {
    position: relative;
    padding-left: 2.5rem;
    max-width: 700px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border);
}

.timeline-item {
    position: relative;
    margin-bottom: 2rem;
}

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

.timeline-marker {
    position: absolute;
    left: -2.5rem;
    top: 0.35rem;
    width: 18px;
    height: 18px;
    background: var(--accent);
    border: 3px solid var(--bg-primary);
    border-radius: 50%;
    box-shadow: 0 0 0 3px var(--accent-bg);
    z-index: 1;
}

.timeline-content {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem 1.5rem;
    transition: all var(--transition);
}

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

.timeline-date {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent);
    background: var(--accent-bg);
    padding: 0.15rem 0.6rem;
    border-radius: 4px;
    margin-bottom: 0.5rem;
}

.timeline-content h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.15rem;
}

.timeline-content h4 {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--accent);
    margin-bottom: 0.5rem;
}

.timeline-content p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ===== Stats ===== */
.stats-section {
    background: var(--accent);
    padding: 3rem 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    text-align: center;
}

.stat-item {
    color: #fff;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1;
    margin-bottom: 0.3rem;
}

.stat-number::after { content: '+'; font-size: 1.5rem; }

.stat-label {
    font-size: 0.85rem;
    font-weight: 500;
    opacity: 0.85;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* ===== Contact ===== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
    align-items: start;
}

.contact-desc {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 0.92rem;
    color: var(--text-secondary);
    transition: color var(--transition);
}

.contact-link:hover { color: var(--accent); }

.contact-icon { font-size: 1.2rem; }

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.contact-form input,
.contact-form textarea {
    padding: 0.8rem 1rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.92rem;
    font-family: inherit;
    background: var(--bg-card);
    color: var(--text-primary);
    transition: border-color var(--transition);
    resize: vertical;
}

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

.contact-form .btn { align-self: flex-start; }

/* ===== Footer ===== */
.footer {
    text-align: center;
    padding: 1.5rem;
    border-top: 1px solid var(--border);
    font-size: 0.82rem;
    color: var(--text-muted);
    background: var(--bg-primary);
}

/* ===== Back to Top ===== */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 42px;
    height: 42px;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 50%;
    font-size: 1.2rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-3px);
    background: var(--accent-light);
}

/* ===== Fade Animations ===== */
.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }
.delay-5 { transition-delay: 0.5s; }

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .hamburger { display: flex; }

    .nav-menu {
        position: fixed;
        top: 63px;
        left: 0;
        right: 0;
        background: var(--nav-bg);
        backdrop-filter: blur(16px);
        flex-direction: column;
        padding: 1rem;
        border-bottom: 1px solid var(--border);
        transform: translateY(-120%);
        transition: transform 0.3s ease;
        gap: 0.25rem;
    }

    .nav-menu.open { transform: translateY(0); }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .skills-grid {
        grid-template-columns: 1fr;
    }

    .projects-grid {
        grid-template-columns: 1fr;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .hero-name {
        font-size: 2.2rem;
    }

    .hero-desc { font-size: 0.9rem; }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }

    .filter-bar {
        gap: 0.3rem;
    }

    .filter-btn {
        padding: 0.4rem 1rem;
        font-size: 0.82rem;
    }
}