/* Meet Shah — Portfolio
   Apple-inspired light theme */

/* ============================
   RESET & ROOT VARIABLES
   ============================ */

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg:              #f5f5f7;
    --surface:         #ffffff;
    --surface-raised:  #fbfbfd;
    --border:          rgba(0, 0, 0, 0.08);
    --border-strong:   rgba(0, 0, 0, 0.14);
    --text:            #1d1d1f;
    --text-secondary:  #6e6e73;
    --text-tertiary:   #86868b;
    --blue:            #0071e3;
    --blue-hover:      #0077ed;
    --blue-light:      #e8f0fc;
    --green:           #34c759;
    --green-light:     #e9f9ee;
    --orange:          #ff9500;
    --red:             #ff3b30;
    --shadow-xs:       0 1px 3px rgba(0,0,0,0.06);
    --shadow-sm:       0 2px 8px rgba(0,0,0,0.07), 0 1px 3px rgba(0,0,0,0.05);
    --shadow-md:       0 4px 20px rgba(0,0,0,0.09), 0 2px 6px rgba(0,0,0,0.05);
    --radius:          14px;
    --radius-sm:       10px;
    --radius-xs:       7px;
    --font:            -apple-system, BlinkMacSystemFont, "SF Pro Text",
                       "Helvetica Neue", Arial, sans-serif;
}

html {
    background-color: var(--bg);
    color: var(--text);
    font-family: var(--font);
    font-size: 15px;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    max-width: 880px;
    margin: 0 auto;
    padding: 0 24px 80px;
}

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

a:hover {
    text-decoration: underline;
}

ul {
    list-style: none;
    padding: 0;
}

/* ============================
   SKIP NAV
   ============================ */

.skip-nav {
    position: absolute;
    top: -100px;
    left: 16px;
    background: var(--blue);
    color: #fff;
    padding: 8px 16px;
    border-radius: var(--radius-xs);
    font-size: 0.85em;
    z-index: 999;
    text-decoration: none;
}

.skip-nav:focus {
    top: 16px;
}

/* ============================
   NAV — frosted glass
   ============================ */

nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.82);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    padding: 14px 0;
    margin-bottom: 32px;
}

.nav-brand {
    font-size: 1.05em;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.3px;
    text-decoration: none;
}

.nav-brand:hover {
    text-decoration: none;
    color: var(--blue);
}

.nav-links {
    display: flex;
    gap: 24px;
    align-items: center;
}

.nav-links a {
    color: var(--text-secondary);
    font-size: 0.9em;
    font-weight: 500;
    text-decoration: none;
    transition: color 0.15s;
}

.nav-links a:hover {
    color: var(--text);
    text-decoration: none;
}

.nav-links a.active {
    color: var(--blue);
}

.nav-status {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8em;
    color: var(--text-tertiary);
    font-weight: 500;
}

.status-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--green);
    display: inline-block;
    animation: pulse 2.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50%       { opacity: 0.4; }
}

/* ============================
   SECTION LABEL
   ============================ */

.section-label {
    font-size: 0.72em;
    font-weight: 600;
    letter-spacing: 0.8px;
    text-transform: uppercase;
    color: var(--text-tertiary);
    margin-bottom: 18px;
}

/* ============================
   HERO
   ============================ */

.hero {
    margin-bottom: 52px;
}

.hero-inner {
    display: flex;
    gap: 32px;
    align-items: flex-start;
    flex-wrap: wrap;
}

.hero-photo {
    flex-shrink: 0;
}

.hero-photo img {
    display: block;
    width: 120px;
    height: 120px;
    object-fit: cover;
    border-radius: 50%;
    box-shadow: var(--shadow-sm);
    border: 3px solid var(--surface);
    outline: 1px solid var(--border);
}

.hero-photo-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 120px;
    height: 120px;
    background: var(--blue-light);
    border-radius: 50%;
    color: var(--blue);
    font-size: 2em;
    font-weight: 700;
    letter-spacing: 1px;
    box-shadow: var(--shadow-sm);
}

.hero-content {
    flex: 1;
    min-width: 240px;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.78em;
    font-weight: 500;
    color: var(--green);
    background: var(--green-light);
    padding: 3px 10px;
    border-radius: 980px;
    margin-bottom: 12px;
}

.hero h1 {
    font-size: 2em;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.5px;
    line-height: 1.15;
    margin-bottom: 4px;
}

.hero-role {
    font-size: 1em;
    font-weight: 500;
    color: var(--blue);
    margin-bottom: 14px;
}

.hero-bio {
    font-size: 0.93em;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 24px;
    max-width: 540px;
}

.hero-buttons {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.btn {
    display: inline-block;
    padding: 9px 20px;
    font-family: var(--font);
    font-size: 0.88em;
    font-weight: 500;
    border-radius: 980px;
    cursor: pointer;
    text-decoration: none;
    border: none;
    transition: opacity 0.15s, transform 0.1s;
}

.btn:hover {
    text-decoration: none;
    opacity: 0.88;
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0);
}

.btn-primary {
    background: var(--blue);
    color: #ffffff;
}

.btn-secondary {
    background: var(--surface);
    color: var(--text);
    box-shadow: var(--shadow-xs);
    border: 1px solid var(--border-strong);
}

.hero-meta {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    font-size: 0.8em;
    color: var(--text-tertiary);
    font-weight: 500;
    align-items: center;
}

.meta-ok {
    color: var(--green);
    display: flex;
    align-items: center;
    gap: 4px;
}

/* ============================
   EXPERIENCE STRIP
   ============================ */

.exp-strip {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 18px 22px;
    background: var(--blue-light);
    border-radius: var(--radius);
    border: 1px solid rgba(0, 113, 227, 0.12);
    margin-bottom: 44px;
    flex-wrap: wrap;
}

.exp-strip .exp-number {
    font-size: 2em;
    font-weight: 700;
    color: var(--blue);
    line-height: 1;
}

.exp-strip .exp-unit {
    font-size: 0.72em;
    font-weight: 600;
    color: var(--blue);
    letter-spacing: 1px;
    text-transform: uppercase;
    align-self: flex-end;
    padding-bottom: 3px;
}

.exp-strip .exp-desc {
    font-size: 0.9em;
    color: var(--text-secondary);
    border-left: 1.5px solid rgba(0,113,227,0.25);
    padding-left: 16px;
    margin-left: 4px;
    line-height: 1.55;
}

/* ============================
   STACK
   ============================ */

.stack-section {
    margin-bottom: 44px;
}

.stack-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
    gap: 10px;
}

.stack-item {
    background: var(--surface);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-xs);
    padding: 14px 16px;
    transition: box-shadow 0.2s, transform 0.15s;
}

.stack-item:hover {
    box-shadow: var(--shadow-sm);
    transform: translateY(-2px);
}

.stack-name {
    font-size: 0.88em;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 3px;
}

.stack-label {
    font-size: 0.72em;
    color: var(--text-tertiary);
    font-weight: 500;
    letter-spacing: 0.3px;
}

/* ============================
   HORIZONTAL TIMELINE
   ============================ */

.timeline-section {
    margin-bottom: 44px;
}

.timeline-outer {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 10px;
    margin: 0 -4px;
    padding-left: 4px;
    padding-right: 4px;
}

/* Subtle custom scrollbar */
.timeline-outer::-webkit-scrollbar {
    height: 3px;
}

.timeline-outer::-webkit-scrollbar-track {
    background: var(--border);
    border-radius: 2px;
}

.timeline-outer::-webkit-scrollbar-thumb {
    background: var(--blue);
    border-radius: 2px;
}

.timeline-track {
    display: flex;
    align-items: flex-start;
    position: relative;
    min-width: max-content;
    padding-top: 7px; /* half dot height — line aligns with dot centers */
}

/* The gradient connecting line */
.timeline-track::before {
    content: '';
    position: absolute;
    top: 7px;
    left: 30px;
    right: 30px;
    height: 2px;
    background: linear-gradient(90deg, var(--blue) 0%, var(--green) 100%);
    border-radius: 1px;
    z-index: 0;
}

.timeline-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 240px;
    flex-shrink: 0;
    padding: 0 12px;
}

.timeline-dot {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--surface);
    border: 2.5px solid var(--blue);
    z-index: 1;
    position: relative;
    flex-shrink: 0;
    margin-bottom: 18px;
    transition: transform 0.2s;
}

.timeline-dot.active {
    background: var(--blue);
    box-shadow: 0 0 0 4px var(--blue-light);
}

.timeline-item:hover .timeline-dot {
    transform: scale(1.25);
}

.timeline-card {
    background: var(--surface);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    padding: 16px;
    width: 100%;
    transition: box-shadow 0.2s, transform 0.15s;
}

.timeline-item:hover .timeline-card {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.tc-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    margin-bottom: 10px;
    flex-wrap: wrap;
}

.tc-type {
    font-size: 0.68em;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 980px;
    letter-spacing: 0.4px;
    text-transform: uppercase;
    flex-shrink: 0;
}

.tc-type.edu {
    background: var(--green-light);
    color: #1a7f3c;
}

.tc-type.exp {
    background: var(--blue-light);
    color: var(--blue);
}

.tc-date {
    font-size: 0.74em;
    font-weight: 500;
    color: var(--text-tertiary);
}

.tc-org {
    font-size: 0.9em;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 2px;
}

.tc-role {
    font-size: 0.8em;
    font-weight: 500;
    color: var(--blue);
    margin-bottom: 10px;
}

.tc-bullets {
    padding: 0;
    margin: 0;
}

.tc-bullets li {
    font-size: 0.8em;
    color: var(--text-secondary);
    line-height: 1.6;
    padding-left: 12px;
    margin-bottom: 5px;
    position: relative;
}

.tc-bullets li::before {
    content: "·";
    position: absolute;
    left: 2px;
    color: var(--blue);
    font-weight: 700;
}

.tc-bullets li:last-child {
    margin-bottom: 0;
}

/* ============================
   CERTIFICATIONS
   ============================ */

.cert-section {
    margin-bottom: 44px;
}

.cert-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.cert-item {
    background: var(--surface);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-xs);
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.88em;
    flex-wrap: wrap;
}

.cert-check {
    color: var(--green);
    font-size: 1em;
    flex-shrink: 0;
    font-weight: 700;
}

.cert-name {
    color: var(--text);
    font-weight: 600;
    flex: 1;
}

.cert-meta {
    color: var(--text-tertiary);
    font-size: 0.88em;
    display: flex;
    gap: 10px;
    align-items: center;
}

.cert-meta a {
    color: var(--blue);
}

/* ============================
   CONTACT
   ============================ */

.contact-section {
    margin-bottom: 44px;
}

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

.contact-row {
    display: flex;
    align-items: center;
    gap: 14px;
    font-size: 0.9em;
    padding: 12px 16px;
    background: var(--surface);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-xs);
    transition: box-shadow 0.15s;
}

.contact-row:hover {
    box-shadow: var(--shadow-sm);
}

.contact-key {
    color: var(--text-tertiary);
    font-size: 0.78em;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    min-width: 80px;
    flex-shrink: 0;
}

.contact-val a {
    color: var(--blue);
    font-weight: 500;
}

/* ============================
   PROJECTS PAGE
   ============================ */

/* Major section wrappers (Academic / Projects) */
.major-section {
    margin-bottom: 44px;
}

.major-section-header {
    display: flex;
    align-items: baseline;
    gap: 12px;
    margin-bottom: 18px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--border-strong);
}

.major-section-title {
    font-size: 1.15em;
    font-weight: 700;
    letter-spacing: -0.3px;
    color: var(--text);
}

.major-section-pill {
    font-size: 0.7em;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    padding: 2px 9px;
    border-radius: 980px;
    flex-shrink: 0;
}

.major-section-pill.academic {
    background: var(--green-light);
    color: #1a7f3c;
}

.major-section-pill.personal {
    background: var(--blue-light);
    color: var(--blue);
}

.projects-intro {
    font-size: 0.92em;
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.75;
    max-width: 580px;
}

.project-group {
    margin-bottom: 28px;
}

/* Last group inside a major section needs less bottom space */
.major-section .project-group:last-child {
    margin-bottom: 0;
}

.group-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 6px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 10px;
}

.group-title {
    font-size: 0.78em;
    font-weight: 700;
    letter-spacing: 0.6px;
    text-transform: uppercase;
    color: var(--text-secondary);
}

.group-meta {
    font-size: 0.75em;
    font-weight: 500;
    color: var(--text-tertiary);
}

.group-dropbox-link {
    font-size: 0.78em;
    font-weight: 600;
    color: var(--blue);
}

.project-card {
    background: var(--surface);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    padding: 16px 18px;
    margin-bottom: 8px;
    transition: box-shadow 0.2s, transform 0.15s;
}

.project-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.project-card:last-child {
    margin-bottom: 0;
}

.project-card-top {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 6px;
}

.project-name {
    font-size: 0.95em;
    font-weight: 700;
    color: var(--text);
}

.project-badge {
    font-size: 0.7em;
    font-weight: 600;
    padding: 2px 10px;
    border-radius: 980px;
    background: var(--bg);
    color: var(--text-tertiary);
    border: 1px solid var(--border-strong);
    white-space: nowrap;
    flex-shrink: 0;
    letter-spacing: 0.3px;
}

.project-badge.win {
    background: #fff7e6;
    border-color: rgba(255,149,0,0.3);
    color: #c87400;
}

.project-tech {
    font-size: 0.8em;
    font-weight: 500;
    color: var(--text-tertiary);
    margin-bottom: 8px;
}

.project-desc {
    font-size: 0.88em;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 8px;
}

.project-desc:last-of-type {
    margin-bottom: 0;
}

.project-files {
    margin-top: 12px;
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.file-tag {
    font-size: 0.72em;
    font-weight: 500;
    color: var(--text-tertiary);
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-xs);
    padding: 2px 8px;
}

.project-links {
    margin-top: 12px;
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    align-items: center;
}

.project-link {
    font-size: 0.82em;
    font-weight: 600;
    color: var(--blue);
}

.project-link:hover {
    text-decoration: underline;
}

.project-link.dropbox {
    color: #1a7f3c;
}

.link-pending {
    font-size: 0.8em;
    color: var(--text-tertiary);
    font-style: italic;
}

/* ============================
   GITHUB NOTE
   ============================ */

.github-note {
    background: var(--surface);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    border-left: 3px solid var(--blue);
    box-shadow: var(--shadow-xs);
    padding: 16px 20px;
    margin-top: 8px;
}

.github-note-label {
    display: block;
    font-size: 0.72em;
    font-weight: 700;
    letter-spacing: 0.6px;
    text-transform: uppercase;
    color: var(--blue);
    margin-bottom: 6px;
}

.github-note p {
    font-size: 0.9em;
    color: var(--text-secondary);
    margin: 0;
}

.github-note a {
    color: var(--blue);
    font-weight: 600;
}

/* ============================
   FOOTER
   ============================ */

footer {
    margin-top: 72px;
    padding-top: 18px;
    border-top: 1px solid var(--border);
    font-size: 0.8em;
    color: var(--text-tertiary);
    font-weight: 500;
}

/* ============================
   RESPONSIVE — tablet
   ============================ */

@media (max-width: 768px) {
    .stack-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .timeline-item {
        width: 210px;
    }
}

/* ============================
   RESPONSIVE — mobile
   ============================ */

@media (max-width: 560px) {
    body {
        padding: 0 16px 60px;
    }

    nav {
        padding: 12px 0;
        margin-bottom: 24px;
    }

    .hero h1 {
        font-size: 1.6em;
    }

    .hero-inner {
        flex-direction: column;
        gap: 20px;
    }

    .hero-photo img,
    .hero-photo-placeholder {
        width: 96px;
        height: 96px;
    }

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

    .exp-strip {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .exp-strip .exp-desc {
        border-left: none;
        border-top: 1px solid rgba(0,113,227,0.2);
        padding-left: 0;
        margin-left: 0;
        padding-top: 10px;
    }

    .cert-item {
        flex-wrap: wrap;
        gap: 6px;
    }

    .timeline-item {
        width: 200px;
    }
}