/* ===================================================
   AUM VASHI — PORTFOLIO
   Monochrome · Apple-style Clean · Responsive
   =================================================== */

/* ---------- CSS CUSTOM PROPERTIES ---------- */
:root {
    /* Light theme */
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f7;
    --bg-card: #ffffff;
    --text-primary: #1d1d1f;
    --text-secondary: #6e6e73;
    --text-tertiary: #86868b;
    --border: #d2d2d7;
    --border-light: #e8e8ed;
    --accent: #1d1d1f;
    --accent-hover: #424245;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 14px rgba(0,0,0,0.08);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
    --shadow-card: 0 2px 12px rgba(0,0,0,0.06);
    --nav-bg: rgba(255,255,255,0.72);
    --nav-border: rgba(210,210,215,0.6);
    --skill-bar-bg: #e8e8ed;
    --skill-bar-fill: #1d1d1f;
    --tag-bg: #f5f5f7;
    --tag-border: #d2d2d7;
    --radius: 12px;
    --radius-sm: 8px;
    --radius-lg: 20px;
    --transition: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

[data-theme="dark"] {
    --bg-primary: #000000;
    --bg-secondary: #0a0a0a;
    --bg-card: #111111;
    --text-primary: #f5f5f7;
    --text-secondary: #a1a1a6;
    --text-tertiary: #6e6e73;
    --border: #2d2d2d;
    --border-light: #1d1d1f;
    --accent: #f5f5f7;
    --accent-hover: #d2d2d7;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 14px rgba(0,0,0,0.4);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.5);
    --shadow-card: 0 2px 12px rgba(0,0,0,0.3);
    --nav-bg: rgba(0,0,0,0.72);
    --nav-border: rgba(45,45,45,0.6);
    --skill-bar-bg: #1d1d1f;
    --skill-bar-fill: #f5f5f7;
    --tag-bg: #1a1a1a;
    --tag-border: #2d2d2d;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
    font-size: 16px;
}

body {
    font-family: var(--font);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 0.4s ease, color 0.4s ease;
    overflow-x: hidden;
}

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

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

ul {
    list-style: none;
}

.container {
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ---------- NAVBAR ---------- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--nav-bg);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 0.5px solid var(--nav-border);
    transition: background var(--transition), border var(--transition);
}

.nav-container {
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 52px;
}

.nav-logo {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    color: var(--text-primary);
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    font-size: 0.8125rem;
    font-weight: 400;
    color: var(--text-secondary);
    transition: color var(--transition);
    letter-spacing: -0.1px;
}

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 6px;
    border-radius: 50%;
    transition: color var(--transition), background var(--transition);
}

.theme-toggle:hover {
    color: var(--text-primary);
    background: var(--tag-bg);
}

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

/* default (dark) */
.icon-sun { display: block; }
.icon-moon { display: none; }

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
}

.hamburger span {
    display: block;
    width: 20px;
    height: 1.5px;
    background: var(--text-primary);
    transition: transform var(--transition), opacity var(--transition);
}

.hamburger.active span:nth-child(1) {
    transform: translateY(6.5px) rotate(45deg);
}
.hamburger.active span:nth-child(2) {
    opacity: 0;
}
.hamburger.active span:nth-child(3) {
    transform: translateY(-6.5px) rotate(-45deg);
}

/* ---------- HERO ---------- */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 0 80px;
}

.hero-container {
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 64px;
    width: 100%;
}

.hero-content {
    flex: 1;
    max-width: 560px;
}

.hero-greeting {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-tertiary);
    margin-bottom: 8px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.hero-name {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    letter-spacing: -2px;
    line-height: 1.05;
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-title {
    font-size: 1.25rem;
    font-weight: 400;
    color: var(--text-secondary);
    margin-bottom: 24px;
    min-height: 1.8em;
}

.typed-text {
    color: var(--text-secondary);
}

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

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

.hero-bio {
    font-size: 1rem;
    color: var(--text-tertiary);
    line-height: 1.7;
    margin-bottom: 32px;
    max-width: 480px;
}

.hero-cta {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 40px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font);
    font-size: 0.875rem;
    font-weight: 500;
    padding: 12px 28px;
    border-radius: 980px;
    cursor: pointer;
    transition: all var(--transition);
    border: none;
    letter-spacing: -0.1px;
}

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

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--tag-bg);
    transform: translateY(-1px);
}

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

.hero-socials {
    display: flex;
    gap: 20px;
}

.hero-socials a {
    color: var(--text-tertiary);
    transition: color var(--transition), transform var(--transition);
}

.hero-socials a:hover {
    color: var(--text-primary);
    transform: translateY(-2px);
}

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

.hero-image-wrapper {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    overflow: hidden;
    border: 3px solid var(--border);
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition), box-shadow var(--transition);
}

.hero-image-wrapper:hover {
    transform: scale(1.03);
    box-shadow: 0 20px 60px rgba(0,0,0,0.15);
}

.hero-image-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top center;
}

/* ---------- SECTIONS ---------- */
.section {
    padding: 100px 0;
}

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

.section-title {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -1px;
    margin-bottom: 56px;
    text-align: center;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 40px;
    height: 3px;
    background: var(--accent);
    margin: 16px auto 0;
    border-radius: 2px;
}

/* ---------- ABOUT ---------- */
.about-content {
    max-width: 720px;
    margin: 0 auto;
}

.about-text p {
    font-size: 1.0625rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 24px;
}

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

.about-details {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-top: 40px;
    padding-top: 40px;
    border-top: 1px solid var(--border-light);
}

.about-detail {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.detail-label {
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-tertiary);
}

.detail-value {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-primary);
}

/* ---------- SKILLS ---------- */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.skill-category {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius);
    padding: 32px;
    transition: transform var(--transition), box-shadow var(--transition);
}

.skill-category:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.skill-category-title {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--text-tertiary);
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.skill-category-title svg {
    color: var(--text-tertiary);
}

/* Skill Bars */
.skill-bars {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.skill-bar-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.skill-bar-header {
    display: flex;
    justify-content: space-between;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-primary);
}

.skill-percent {
    color: var(--text-tertiary);
    font-weight: 400;
}

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

.skill-bar-fill {
    height: 100%;
    width: 0;
    background: var(--skill-bar-fill);
    border-radius: 3px;
    transition: width 1.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* Skill Tags */
.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.skill-tag {
    font-size: 0.8125rem;
    font-weight: 400;
    padding: 8px 16px;
    border-radius: 980px;
    background: var(--tag-bg);
    border: 1px solid var(--tag-border);
    color: var(--text-secondary);
    transition: all var(--transition);
}

.skill-tag:hover {
    background: var(--accent);
    color: var(--bg-primary);
    border-color: var(--accent);
    transform: translateY(-2px);
}

/* ---------- PROJECTS ---------- */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

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

.project-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--border);
}

.project-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    color: var(--text-tertiary);
}

.project-links {
    display: flex;
    gap: 14px;
}

.project-links a {
    color: var(--text-tertiary);
    transition: color var(--transition), transform var(--transition);
}

.project-links a:hover {
    color: var(--text-primary);
    transform: translateY(-2px);
}

.project-title {
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: -0.3px;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.project-description {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 24px;
    flex: 1;
}

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

.project-tech span {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-tertiary);
    padding: 4px 12px;
    border-radius: 980px;
    background: var(--tag-bg);
    border: 1px solid var(--tag-border);
}

/* ---------- EDUCATION (TIMELINE) ---------- */
.timeline {
    max-width: 640px;
    margin: 0 auto;
    position: relative;
    padding-left: 32px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 7px;
    top: 8px;
    bottom: 8px;
    width: 1px;
    background: var(--border);
}

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

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

.timeline-dot {
    position: absolute;
    left: -28px;
    top: 6px;
    width: 13px;
    height: 13px;
    border-radius: 50%;
    background: var(--bg-primary);
    border: 2px solid var(--accent);
    z-index: 1;
}

.timeline-content {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius);
    padding: 28px;
    transition: transform var(--transition), box-shadow var(--transition);
}

.timeline-content:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.timeline-date {
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-tertiary);
}

.timeline-content h3 {
    font-size: 1.125rem;
    font-weight: 600;
    letter-spacing: -0.3px;
    margin: 8px 0 4px;
    color: var(--text-primary);
}

.timeline-institution {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.timeline-detail {
    font-size: 0.8125rem;
    color: var(--text-tertiary);
}

.timeline-detail strong {
    color: var(--text-primary);
}

/* ---------- CERTIFICATIONS ---------- */
.certs-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.cert-card {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius);
    padding: 28px 24px;
    text-align: center;
    transition: transform var(--transition), box-shadow var(--transition);
}

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

.cert-icon {
    color: var(--text-tertiary);
    margin-bottom: 16px;
}

.cert-card h3 {
    font-size: 0.9375rem;
    font-weight: 600;
    letter-spacing: -0.2px;
    margin-bottom: 6px;
    color: var(--text-primary);
    line-height: 1.3;
}

.cert-platform {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    margin-bottom: 2px;
}

.cert-year {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    margin-bottom: 16px;
}

.cert-link {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color var(--transition);
}

.cert-link:hover {
    color: var(--text-primary);
}

/* ---------- ACHIEVEMENTS ---------- */
.achievements-list {
    max-width: 640px;
    margin: 0 auto;
}

.achievement-item {
    display: flex;
    gap: 24px;
    align-items: flex-start;
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius);
    padding: 32px;
    transition: transform var(--transition), box-shadow var(--transition);
}

.achievement-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.achievement-icon {
    color: var(--text-tertiary);
    flex-shrink: 0;
    padding-top: 2px;
}

.achievement-content h3 {
    font-size: 1.125rem;
    font-weight: 600;
    letter-spacing: -0.3px;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.achievement-content p {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.achievement-content p strong {
    color: var(--text-primary);
}

/* ---------- CONTACT ---------- */
.contact-content {
    text-align: center;
    max-width: 520px;
    margin: 0 auto;
}

.contact-text {
    font-size: 1.0625rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 32px;
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: 32px;
    margin-top: 48px;
}

.contact-links a {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-tertiary);
    transition: color var(--transition), transform var(--transition);
}

.contact-links a span {
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.3px;
}

.contact-links a:hover {
    color: var(--text-primary);
    transform: translateY(-3px);
}

/* ---------- FOOTER ---------- */
.footer {
    padding: 40px 0;
    text-align: center;
    border-top: 1px solid var(--border-light);
}

.footer p {
    font-size: 0.8125rem;
    color: var(--text-tertiary);
    line-height: 1.6;
}

.footer strong {
    color: var(--text-secondary);
    font-weight: 500;
}

.footer-year {
    margin-top: 4px;
}

/* ---------- REVEAL ANIMATIONS ---------- */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94),
                transform 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

/* Stagger children */
.reveal:nth-child(2) { transition-delay: 0.1s; }
.reveal:nth-child(3) { transition-delay: 0.2s; }
.reveal:nth-child(4) { transition-delay: 0.3s; }

/* ---------- RESPONSIVE ---------- */
@media (max-width: 1024px) {
    .certs-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    html {
        scroll-padding-top: 52px;
    }

    .nav-links {
        display: none;
        position: fixed;
        top: 52px;
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--bg-primary);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 36px;
        z-index: 999;
    }

    .nav-links.open {
        display: flex;
    }

    .nav-links a {
        font-size: 1.125rem;
    }

    .hamburger {
        display: flex;
    }

    .hero {
        padding: 100px 0 60px;
    }

    .hero-container {
        flex-direction: column-reverse;
        text-align: center;
        gap: 40px;
    }

    .hero-content {
        max-width: 100%;
    }

    .hero-bio {
        max-width: 100%;
        margin-left: auto;
        margin-right: auto;
    }

    .hero-cta {
        justify-content: center;
        flex-wrap: wrap;
    }

    .hero-socials {
        justify-content: center;
    }

    .hero-image-wrapper {
        width: 220px;
        height: 220px;
    }

    .section {
        padding: 72px 0;
    }

    .section-title {
        font-size: 1.75rem;
        margin-bottom: 40px;
    }

    .skills-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .projects-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .about-details {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

    .certs-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .contact-links {
        gap: 24px;
    }
}

@media (max-width: 480px) {
    .hero-name {
        font-size: 2.25rem;
    }

    .hero-cta {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        width: 100%;
        text-align: center;
    }

    .about-details {
        grid-template-columns: 1fr;
    }

    .skill-category {
        padding: 24px;
    }

    .project-card {
        padding: 24px;
    }

    .contact-links {
        flex-wrap: wrap;
        gap: 28px;
    }
}