/* ============================================================
   THEME VARIABLES — LIGHT MODE
   ============================================================ */
:root {
    --bg:        #f7f9fc;
    --bg-alt:    #eef2f7;
    --text:      #1c2530;
    --subtext:   #4a5869;

    --accent:    #67c1f5;     /* cyan */
    --accent2:   #90eed2;     /* mint */

    --button-bg:        var(--accent);
    --button-bg-hover:  #48ace7;
    --button-text:      #ffffff;

    --shadow:           rgba(0, 0, 0, 0.15);

    /* Layout helpers */
    --max-width: 1100px;
    --radius-lg: 22px;
    --radius-sm: 12px;

    --transition: 0.25s ease;
}

/* ============================================================
   THEME VARIABLES — DARK MODE
   ============================================================ */
@media (prefers-color-scheme: dark) {
    :root {
        --bg:        #2e3440;
        --bg-alt:    #3b4252;
        --text:      #eceff4;
        --subtext:   #d8dee9;

        --accent:    #81a1c1;
        --accent2:   #88c0d0;

        --button-bg:        var(--accent);
        --button-bg-hover:  #5e81ac;
        --button-text:      #0b1f33;

        --shadow:           rgba(0, 0, 0, 0.55);
    }
}

/* ============================================================
   GLOBAL RESETS
   ============================================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Inter", sans-serif;
}

body {
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

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

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


/* Inline links */
a.inline-link {
    color: var(--accent);
    font-weight: 600;
    border-bottom: 1px solid transparent;
    transition: color 0.2s ease, border-color 0.2s ease;
}

a.inline-link:hover {
    color: var(--accent2);
    border-color: var(--accent2);
}

p {
    color: var(--subtext);
}

section {
    padding: 80px 20px;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;

    padding: 16px 10%;
    position: sticky;
    top: 0;
    z-index: 1000;

    background: rgba(46, 52, 64, 0.55);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);

    border-bottom: 1px solid rgba(136, 192, 208, 0.12);
    box-shadow: 0 0 24px rgba(0,0,0,0.25);
}

.nav-left {
    font-size: 20px;
    font-weight: 700;
    color: var(--text);
    transition: text-shadow .25s ease, color .25s ease;
}

.nav-left:hover {
    color: var(--accent2);
    text-shadow: 0 0 12px var(--accent2);
}

.nav-links a {
    margin-left: 24px;
    position: relative;

    padding: 6px 0;
    color: var(--subtext);
    font-weight: 500;

    transition: color .25s ease;
}

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

.nav-links a::after {
    content: "";
    position: absolute;
    left: 50%;
    bottom: -4px;
    transform: translateX(-50%) scaleX(0);
    width: 60%;
    height: 2px;
    background: var(--accent);
    transition: transform .25s ease;
    border-radius: 2px;
}

.nav-links a:hover::after,
.nav-links a.highlight::after {
    transform: translateX(-50%) scaleX(1);
}

/* ============================================================
   HERO SECTION
   ============================================================ */
.hero {
    text-align: center;
    padding: 100px 20px;
    background: linear-gradient(180deg, var(--bg) 0%, var(--bg-alt) 100%);
}

.hero-title {
    font-size: 42px;
    font-weight: 800;
    color: var(--text);
    margin-bottom: 20px;
}

.hero-subtitle {
    max-width: 720px;
    margin: 0 auto 35px;
    font-size: 18px;
}

/* Pretty Icon in Hero */
.hero-avatar {
    width: 180px;
    height: auto;
    border-radius: var(--radius-lg);
    margin: 0 auto 25px;
}

/* ============================================================
   BUTTONS
   ============================================================ */
.button {
    background: var(--button-bg);
    color: var(--button-text);

    padding: 14px 26px;
    border-radius: var(--radius-sm);
    font-weight: 600;

    display: inline-block;
    margin-top: 10px;
    cursor: pointer;

    transition: var(--transition);
}

.button:hover {
    background: var(--button-bg-hover);
}

/* ============================================================
   HERO STATS
   ============================================================ */
.hero-stats {
    display: flex;
    gap: 40px;
    justify-content: center;
    margin-top: 50px;
    font-size: 18px;
    flex-wrap: wrap;
}

.hero-stats span {
    display: block;
    font-size: 28px;
    font-weight: 700;
    color: var(--accent);
}

/* ============================================================
   ABOUT SECTION
   ============================================================ */
.about-preview {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    gap: 60px;
    align-items: center;
    flex-wrap: wrap;
}

.about-img img {
    width: 260px;
    border-radius: var(--radius-lg);
    box-shadow: 0 6px 24px var(--shadow);
}

.about-text h2 {
    font-size: 32px;
    margin-bottom: 20px;
}

.about-text p {
    margin-bottom: 20px;
}


/* ============================================================
   FEATURE-PROJECTS SECTION
   ============================================================ */
/* Featured Projects */
.featured-projects {
    max-width: var(--max-width);
    margin: 0 auto;
    padding-top: 40px;
    padding-bottom: 80px;
}

.section-title {
    text-align: center;
    font-size: 32px;
    font-weight: 800;
    margin-bottom: 50px;
}

/* Grid Layout */
.projects-grid {
    display: grid;
    gap: 40px;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

/* Project Card */
.project-card {
    background: var(--bg-alt);
    padding: 28px;
    border-radius: var(--radius-lg);
    box-shadow: 0 6px 20px var(--shadow);

    display: flex;
    flex-direction: column;
    gap: 16px;

    transition: transform .25s ease, box-shadow .25s ease;
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow:
        0 14px 32px var(--shadow),
        0 0 26px rgba(129, 161, 193, 1),
        0 0 26px rgba(94, 129, 172, 1);
}

.project-icon {
    width: 48px;
    height: 48px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.icon-mask {
    width: 100%;
    height: 100%;
    display: block;
}

.project-icon img {
    width: 100%;
    height: 100%;

    object-fit: contain;       /* important */
    object-position: center;

    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;

    display: block;
}

/* Titles / Text */
.project-card h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text);
}

.project-card p {
    font-size: 15px;
    color: var(--subtext);
}

/* Tag chips */
.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: auto;
}

.project-tags span {
    background: var(--bg);
    color: var(--text);
    padding: 5px 10px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 600;
    box-shadow: 0 1px 3px var(--shadow);
}


.projects-more {
    text-align: center;
    margin-top: 40px;
}

/* Working On Section (Pretty Cards + Tag Titles) */

.working-on {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 60px 20px 80px;
}

.work-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 28px;
}

.work-card {
    background: rgba(255,255,255,0.06);
    backdrop-filter: blur(6px);
    border-radius: var(--radius-lg);
    padding: 22px 24px;

    box-shadow:
        0 2px 12px rgba(0,0,0,0.25),
        0 0 16px rgba(129, 161, 193, 0.1),
        0 0 16px rgba(94, 129, 172, 0.1);

    transition: transform .25s ease, box-shadow .25s ease;
}

.work-card:hover {
    transform: translateY(-4px);
    box-shadow:
        0 10px 24px rgba(0,0,0,0.35),
        0 0 26px rgba(129, 161, 193, 1),
        0 0 26px rgba(94, 129, 172, 1);
}

.work-icon {
    display: block;        /* makes margin auto work */
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 14px;

    width: 48px;
    height: 48px;
    object-fit: contain;

    filter: drop-shadow(0 0 6px rgba(103,193,245,0.35));
}

.work-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 14px;
}

.work-tags span {
    background: var(--bg);
    color: var(--text);

    padding: 6px 12px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 600;

    box-shadow: 0 1px 3px var(--shadow);

    transition: background .2s ease, color .2s ease;
}

.work-tags span:hover {
    background: var(--accent);
    color: var(--button-text);
}

.work-card p {
    margin: 0;
    color: var(--subtext);
    line-height: 1.6;
    font-size: 15px;
}


.footer {
    background: #1e2530;
    padding: 50px 0 30px;
    margin-top: 80px;
    color: var(--subtext);
    border-top: 1px solid rgba(255,255,255,0.08);

    display: flex;
    justify-content: center;
}

.footer-inner {
    width: 100%;
    max-width: var(--max-width);
    padding: 0 20px;

    display: flex;
    flex-direction: column;
    gap: 40px;
}

.footer-columns {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 40px;
}

.footer-col h3 {
    margin-bottom: 12px;
    font-size: 18px;
    font-weight: 600;
    color: var(--text);
}

.footer-col p {
    margin: 6px 0;
    font-size: 15px;
}

.footer-col a {
    text-decoration: none;
    color: var(--subtext);
    transition: color .2s ease;
}

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

.footer-bottom {
    max-width: var(--max-width);
    width: 100%;
    margin: 40px auto 0;
    padding-top: 20px;
    text-align: center;

    font-size: 14px;
    color: var(--subtext);
    opacity: 0.6;

    border-top: 1px solid rgba(255,255,255,0.05);
}


/* ============================================================
   TIMELINE SECTION (component-level styling)
   ============================================================ */


.timeline-header {
    text-align: center;
    margin-bottom: 60px;
}

.timeline-header .section-title {
    font-size: 36px;
    font-weight: 800;
    color: var(--text);
    margin-bottom: 12px;
}

.timeline-header .section-subtitle {
    font-size: 18px;
    color: var(--subtext);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

.timeline-section {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 60px 20px 100px;
}

/* Timeline wrapper */
.timeline {
    position: relative;
    margin: 60px auto;
    max-width: 900px;
    padding: 0 40px;
}

/* Vertical spine */
.timeline::before {
    content: "";
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 3px;
    height: 100%;
    background: var(--accent);
    box-shadow: 0 0 25px var(--accent);
    border-radius: 4px;
}


.repo-link {
    display: inline-block;
    margin-top: 14px;

    background: var(--button-bg);
    color: var(--button-text);
    padding: 10px 18px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 14px;

    transition: background .25s ease;
}

.repo-link:hover {
    background: var(--button-bg-hover);
}



.repo-date {
    padding: 4px 10px;
    background: var(--bg);
    color: var(--text);
    border-radius: var(--radius-sm);

    font-size: 13px;
    font-weight: 600;

    box-shadow: 0 2px 4px var(--shadow);
    opacity: 0.85;
}


.repo-title {
    margin-top: 6px;
    margin-bottom: 10px;
    font-size: 22px;
    font-weight: 700;
    color: var(--text);
}


.repo-top {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 12px;
}


.repo-avatar {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    object-fit: cover;

    box-shadow: 0 0 10px rgba(129, 161, 193, 0.35);
}

/* Each checkpoint container */
.checkpoint {
    width: 50%;
    padding: 28px 0;
    position: relative;
}

/* Timeline card (reuses your card look) */
.checkpoint > div {
    background: var(--bg-alt);
    border: 2px solid var(--accent2);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: 0 6px 20px var(--shadow);
}

/* All inner divs revert to normal */
.checkpoint > div * div {
    background: none;
    border: none;
    padding: 0;
    box-shadow: none;
}

/* Title */
.checkpoint h2 {
    font-size: 20px;
    font-weight: 700;
    color: var(--accent2);
    margin-bottom: 10px;
}

/* Text */
.checkpoint p {
    color: var(--subtext);
    font-size: 16px;
    line-height: 1.55;
}

/* Glowing dot */
.checkpoint::before {
    content: "";
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 14px;
    height: 14px;
    background: var(--accent);
    border-radius: 50%;
    box-shadow: 0 0 12px var(--accent), 0 0 24px var(--accent2);
}

/* Left side */
.checkpoint:nth-child(odd) {
    left: 0;
    text-align: left;
    padding-right: 40px;
}
.checkpoint:nth-child(odd)::before {
    right: -7px;
}

/* Right side */
.checkpoint:nth-child(even) {
    left: 50%;
    text-align: left;
    padding-left: 40px;
}
.checkpoint:nth-child(even)::before {
    left: -7px;
}

/* MOBILE */
@media (max-width: 768px) {
    .timeline::before {
        left: 20px;
    }

    .checkpoint {
        width: 100%;
        padding-left: 45px;
        padding-right: 0;
    }

    .checkpoint:nth-child(even),
    .checkpoint:nth-child(odd) {
        left: 0;
        text-align: left;
    }

    .checkpoint::before {
        left: 14px;
        right: auto;
    }
}


/* ============================================================
   ABOUT PAGE — MATCHES INDEX STYLE
   ============================================================ */

.about-hero {
    padding: 120px 20px 80px;
    background: linear-gradient(180deg, var(--bg-alt), var(--bg));
}

.about-hero-inner {
    max-width: var(--max-width);
    margin: 0 auto;

    display: flex;
    align-items: center;
    justify-content: center;
    gap: 60px;
    flex-wrap: wrap;
}

.about-hero-photo img {
    width: 260px;
    border-radius: var(--radius-lg);
    box-shadow: 0 8px 32px var(--shadow);
}

.about-hero-text {
    max-width: 580px;
}

.about-hero-text .hero-title {
    margin-bottom: 20px;
    font-size: 42px;
}

.about-hero-text .hero-subtitle {
    font-size: 20px;
    color: var(--accent2);
    margin-bottom: 22px;
}

.about-hero-text .hero-body {
    margin-bottom: 18px;
    color: var(--subtext);
    font-size: 17px;
    line-height: 1.65;
}

/* MOBILE */
@media (max-width: 850px) {
    .about-hero {
        text-align: center;
    }

    .about-hero-inner {
        flex-direction: column;
    }

    .about-hero-photo img {
        margin-bottom: 20px;
    }
}

.about-text {
    max-width: 600px;
}

.about-large {
    font-size: 20px;
    color: var(--accent);
    margin-bottom: 20px;
}

/* Values / philosophy cards */
.about-values {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 40px 20px 80px;
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 26px;
}

.value-card {
    background: var(--bg-alt);
    padding: 22px;
    border-radius: var(--radius-lg);
    box-shadow: 0 6px 20px var(--shadow);
}

.value-card h3 {
    color: var(--accent);
    margin-bottom: 10px;
}

/* Engineering focus */
.about-focus {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 20px 20px 80px;
}

.focus-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 26px;
}

.focus-card {
    background: var(--bg-alt);
    padding: 22px;
    border-radius: var(--radius-lg);
    box-shadow: 0 6px 20px var(--shadow);
    text-align: center;
}

.focus-card .focus-icon {
    width: 50px;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 12px;
    filter: drop-shadow(0 0 6px rgba(129,161,193,0.35));
}

/* Mini timeline */
.about-timeline {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 20px 20px 80px;
}

.about-timeline-list {
    list-style: none;
    padding-left: 0;
}

.about-timeline-list li {
    margin-bottom: 10px;
    color: var(--subtext);
}

/* ============================================================
   ABOUT PAGE — MINI TIMELINE (reusing main checkpoint system)
   ============================================================ */

.about-timeline {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 40px 20px 100px;
}

.about-path-timeline {
    position: relative;
    margin: 60px auto;
    max-width: 900px;
    padding: 0 40px;
}

/* Vertical spine */
.about-path-timeline::before {
    content: "";
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 3px;
    height: 100%;
    background: var(--accent);
    box-shadow: 0 0 18px var(--accent);
    border-radius: 6px;
}

/* Reuse checkpoint styling */
.about-path-timeline .checkpoint {
    width: 50%;
    padding: 28px 0;
    position: relative;
}

.about-path-timeline .checkpoint-inner {
    background: var(--bg-alt);
    border: 2px solid var(--accent2);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: 0 6px 20px var(--shadow);
}

.about-path-timeline .checkpoint .repo-date {
    background: var(--bg);
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
    box-shadow: 0 2px 4px var(--shadow);
}

.about-path-timeline .checkpoint h2 {
    margin-top: 10px;
    margin-bottom: 10px;
    font-size: 20px;
    font-weight: 700;
    color: var(--accent2);
}

.about-path-timeline .checkpoint p {
    color: var(--subtext);
    line-height: 1.6;
}

/* Dot */
.about-path-timeline .checkpoint::before {
    content: "";
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 14px;
    height: 14px;
    background: var(--accent);
    border-radius: 50%;
    box-shadow: 0 0 14px var(--accent), 0 0 28px var(--accent2);
}

/* Left */
.about-path-timeline .checkpoint.left {
    left: 0;
    padding-right: 40px;
}
.about-path-timeline .checkpoint.left::before {
    right: -7px;
}

/* Right */
.about-path-timeline .checkpoint.right {
    left: 50%;
    padding-left: 40px;
}
.about-path-timeline .checkpoint.right::before {
    left: -7px;
}

/* MOBILE */
@media (max-width: 850px) {
    .about-path-timeline::before {
        left: 24px;
        transform: translateX(0);
    }

    .about-path-timeline .checkpoint,
    .about-path-timeline .checkpoint.left,
    .about-path-timeline .checkpoint.right {
        width: 100%;
        left: 0;
        padding-left: 50px;
        padding-right: 0;
    }

    .about-path-timeline .checkpoint::before,
    .about-path-timeline .checkpoint.left::before,
    .about-path-timeline .checkpoint.right::before {
        left: 18px;
        right: auto;
    }
}

@media (max-width: 600px) {
    .about-path-timeline {
        padding: 0 20px;
    }

    .about-path-timeline .checkpoint-inner {
        padding: 18px;
    }

    .about-path-timeline .checkpoint h2 {
        font-size: 18px;
    }
}





/* ============================================================

   TOOLKIT LIST

   ============================================================ */

.toolkit-list {

    list-style: none;

    padding: 0;

    display: grid;

    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));

    gap: 26px;

}



.toolkit-list li {

    background: var(--bg-alt);

    padding: 22px;

    border-radius: var(--radius-lg);

    box-shadow: 0 6px 20px var(--shadow);

}


/* ============================================================
   RESPONSIVE DESIGN
   ============================================================ */
@media (max-width: 900px) {
    .hero-title {
        font-size: 34px;
    }

    .about-preview {
        text-align: center;
        justify-content: center;
    }

    .about-img img {
        margin: 0 auto;
    }
}

@media (max-width: 600px) {
    .navbar {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }

    .nav-links a {
        margin-left: 12px;
    }

    .hero-title {
        font-size: 28px;
    }

    .hero-avatar {
        width: 150px;
    }
}