/* ===================================================
   PORTFOLIO — Muhammad Talha
   Color palette: charcoal / off-white / warm teal
   =================================================== */

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

:root {
    /* Backgrounds */
    --bg-primary: #0f1115;
    --bg-secondary: #161920;
    --bg-card: #1a1e27;
    --bg-card-hover: #1f2430;

    /* Text */
    --text-primary: #e4e6eb;
    --text-secondary: #9ba1b0;
    --text-muted: #636a7a;

    /* Accent — warm teal */
    --accent: #3db8a0;
    --accent-dim: rgba(61, 184, 160, 0.12);
    --accent-hover: #4dcdb3;

    /* Border */
    --border: #252a35;
    --border-light: #2d3340;

    /* Fonts */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Spacing */
    --section-padding: 120px 0;
    --container-width: 1060px;

    /* Transitions */
    --ease-smooth: cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.25s var(--ease-smooth);
}

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

::selection {
    background: var(--accent);
    color: var(--bg-primary);
}

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


/* =========================================
   NAVIGATION
   ========================================= */
#navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 0 24px;
    transition: background 0.35s var(--ease-smooth),
                box-shadow 0.35s var(--ease-smooth),
                padding 0.35s var(--ease-smooth);
}

#navbar.scrolled {
    background: rgba(15, 17, 21, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: 0 1px 0 var(--border);
}

.nav-container {
    max-width: var(--container-width);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.nav-logo {
    font-size: 1.35rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    color: var(--text-primary);
    transition: opacity 0.25s;
}

.nav-logo:hover {
    opacity: 0.8;
}

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

.nav-links {
    display: flex;
    gap: 32px;
    list-style: none;
}

.nav-links a {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    padding: 4px 0;
    transition: color 0.25s;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1.5px;
    background: var(--accent);
    transition: width 0.3s var(--ease-smooth);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--accent);
}

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

/* Mobile Nav Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    z-index: 1001;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all 0.3s var(--ease-smooth);
    border-radius: 2px;
}

.nav-toggle.open span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.open span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.open span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}


/* =========================================
   HERO SECTION
   ========================================= */
#hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding: 0 24px;
}

.hero-content {
    max-width: var(--container-width);
    margin: 0 auto;
    width: 100%;
}

.hero-greeting {
    font-family: var(--font-mono);
    font-size: 0.95rem;
    color: var(--accent);
    margin-bottom: 16px;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeUp 0.6s var(--ease-smooth) 0.2s forwards;
}

.hero-name {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 700;
    letter-spacing: -1.5px;
    line-height: 1.1;
    color: var(--text-primary);
    margin-bottom: 12px;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeUp 0.6s var(--ease-smooth) 0.35s forwards;
}

.hero-title-wrapper {
    font-size: clamp(1.25rem, 3vw, 2rem);
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 24px;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeUp 0.6s var(--ease-smooth) 0.5s forwards;
}

.hero-title-dynamic {
    color: var(--text-secondary);
}

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

.hero-description {
    max-width: 540px;
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.75;
    margin-bottom: 36px;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeUp 0.6s var(--ease-smooth) 0.65s forwards;
}

.hero-cta {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeUp 0.6s var(--ease-smooth) 0.8s forwards;
}

.hero-socials {
    display: flex;
    gap: 20px;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeUp 0.6s var(--ease-smooth) 0.95s forwards;
}

.social-link {
    color: var(--text-muted);
    transition: color 0.25s, transform 0.25s;
}

.social-link:hover {
    color: var(--accent);
    transform: translateY(-2px);
}

.hero-scroll-indicator {
    position: absolute;
    bottom: 40px;
    right: 48px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    opacity: 0;
    animation: fadeUp 0.6s var(--ease-smooth) 1.2s forwards;
}

.hero-scroll-indicator span {
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--text-muted);
    writing-mode: vertical-rl;
}

.scroll-line {
    width: 1px;
    height: 48px;
    background: var(--text-muted);
    position: relative;
    overflow: hidden;
}

.scroll-line::after {
    content: '';
    position: absolute;
    top: -100%;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--accent);
    animation: scrollDown 2s ease infinite;
}


/* =========================================
   BUTTONS
   ========================================= */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 500;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.25s var(--ease-smooth);
    border: none;
}

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

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 20px rgba(61, 184, 160, 0.25);
}

.btn-outline {
    background: transparent;
    color: var(--accent);
    border: 1.5px solid var(--accent);
}

.btn-outline:hover {
    background: var(--accent-dim);
    transform: translateY(-1px);
}

.btn-large {
    padding: 16px 40px;
    font-size: 1rem;
}


/* =========================================
   SECTIONS (SHARED)
   ========================================= */
.section {
    padding: var(--section-padding);
}

.section-heading {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 56px;
    display: flex;
    align-items: center;
    gap: 12px;
    letter-spacing: -0.5px;
}

.section-heading::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
    max-width: 300px;
}

.section-number {
    font-family: var(--font-mono);
    font-size: 1rem;
    font-weight: 500;
    color: var(--accent);
}


/* =========================================
   ABOUT SECTION
   ========================================= */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: start;
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 18px;
    font-size: 0.975rem;
}

.about-text strong {
    color: var(--text-primary);
    font-weight: 600;
}

.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 28px 24px;
    text-align: center;
    transition: border-color 0.3s, transform 0.3s;
}

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

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent);
    line-height: 1;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
}


/* =========================================
   SKILLS SECTION
   ========================================= */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.skill-category-title {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-muted);
    margin-bottom: 20px;
    font-weight: 600;
}

.skill-items {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.skill-chip {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 18px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: border-color 0.25s, color 0.25s, transform 0.25s;
}

.skill-chip:hover {
    border-color: var(--accent);
    color: var(--text-primary);
    transform: translateX(4px);
}

.skill-icon {
    color: var(--accent);
    font-size: 0.75rem;
    flex-shrink: 0;
}


/* =========================================
   PROJECTS SECTION
   ========================================= */
.projects-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}

.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 32px 28px;
    display: flex;
    flex-direction: column;
    transition: border-color 0.3s, transform 0.3s, box-shadow 0.3s;
    position: relative;
}

.project-card:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 24px;
}

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

.project-links a {
    color: var(--text-muted);
    transition: color 0.25s;
}

.project-links a:hover {
    color: var(--accent);
}

.project-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 4px;
    color: var(--text-primary);
    letter-spacing: -0.3px;
}

.project-subtitle {
    font-size: 0.825rem;
    color: var(--accent);
    font-weight: 500;
    margin-bottom: 16px;
    font-family: var(--font-mono);
}

.project-description {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
    flex-grow: 1;
    margin-bottom: 24px;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 12px;
}

.project-tech span {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    padding: 4px 10px;
    background: var(--accent-dim);
    border-radius: 4px;
}

.project-date {
    font-size: 0.78rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
}


/* =========================================
   EDUCATION / TIMELINE
   ========================================= */
.timeline {
    position: relative;
    padding-left: 32px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 6px;
    top: 8px;
    bottom: 8px;
    width: 1px;
    background: var(--border-light);
}

.timeline-item {
    position: relative;
    padding-bottom: 48px;
}

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

.timeline-marker {
    position: absolute;
    left: -32px;
    top: 6px;
    width: 13px;
    height: 13px;
    border-radius: 50%;
    background: var(--bg-primary);
    border: 2px solid var(--accent);
    z-index: 1;
}

.timeline-item:first-child .timeline-marker {
    background: var(--accent);
    box-shadow: 0 0 0 4px var(--accent-dim);
}

.timeline-content {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 24px 28px;
    transition: border-color 0.3s;
}

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

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 6px;
    gap: 16px;
}

.timeline-header h3 {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
}

.timeline-date {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--accent);
    white-space: nowrap;
    flex-shrink: 0;
}

.timeline-school {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.timeline-detail {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 6px;
}


/* =========================================
   CONTACT SECTION
   ========================================= */
#contact {
    text-align: center;
}

.contact-content {
    max-width: 560px;
    margin: 0 auto;
}

.contact-text {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.75;
    margin-bottom: 36px;
}

.contact-links {
    margin-top: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.contact-links a {
    font-size: 0.9rem;
    color: var(--text-muted);
    transition: color 0.25s;
}

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

.contact-divider {
    color: var(--border-light);
    user-select: none;
}


/* =========================================
   FOOTER
   ========================================= */
#footer {
    padding: 32px 24px;
    text-align: center;
    border-top: 1px solid var(--border);
}

.footer-text {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
}


/* =========================================
   SCROLL REVEAL ANIMATIONS
   ========================================= */
.reveal {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.7s var(--ease-smooth),
                transform 0.7s var(--ease-smooth);
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}


/* =========================================
   KEYFRAMES
   ========================================= */
@keyframes fadeUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes scrollDown {
    0% { top: -100%; }
    100% { top: 100%; }
}


/* =========================================
   RESPONSIVE
   ========================================= */
@media (max-width: 900px) {
    .about-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

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

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

    .timeline-header {
        flex-direction: column;
    }
}

@media (max-width: 640px) {
    :root {
        --section-padding: 80px 0;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        max-width: 300px;
        height: 100vh;
        background: var(--bg-secondary);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 28px;
        transition: right 0.35s var(--ease-smooth);
        box-shadow: -4px 0 20px rgba(0, 0, 0, 0.3);
    }

    .nav-links.open {
        right: 0;
    }

    .nav-links a {
        font-size: 1.05rem;
    }

    .nav-toggle {
        display: flex;
    }

    .hero-scroll-indicator {
        display: none;
    }

    .skills-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .hero-cta {
        flex-direction: column;
        gap: 12px;
    }

    .section-heading {
        font-size: 1.35rem;
    }

    .contact-links {
        flex-direction: column;
        gap: 8px;
    }

    .contact-divider {
        display: none;
    }
}