/* =========================================================
   Premium Portfolio Frontend
   Sections: tokens, base, layout, components, responsive
   ========================================================= */

:root {
    --bg: #05070d;
    --bg-soft: #090d16;
    --surface: rgba(255, 255, 255, 0.075);
    --surface-strong: rgba(255, 255, 255, 0.12);
    --line: rgba(255, 255, 255, 0.14);
    --line-strong: rgba(255, 255, 255, 0.24);
    --text: #f7f8ff;
    --muted: #aab3c8;
    --soft: #d8def0;
    --primary: #75f4d3;
    --secondary: #8ea7ff;
    --accent: #ffcf70;
    --rose: #ff7aa8;
    --shadow: 0 24px 80px rgba(0, 0, 0, 0.36);
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 28px;
    --container: 1160px;
    --space-1: 8px;
    --space-2: 16px;
    --space-3: 24px;
    --space-4: 32px;
    --space-5: 40px;
    --space-6: 48px;
    --space-7: 56px;
    --space-8: 64px;
    --space-10: 80px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: "Poppins", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at 12% 18%, rgba(117, 244, 211, 0.16), transparent 30%),
        radial-gradient(circle at 84% 10%, rgba(142, 167, 255, 0.2), transparent 28%),
        radial-gradient(circle at 68% 86%, rgba(255, 122, 168, 0.14), transparent 30%),
        var(--bg);
    overflow-x: hidden;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: -3;
    background: linear-gradient(115deg, #05070d, #07151a, #0f1020, #120b17, #05070d);
    background-size: 420% 420%;
    animation: gradientShift 18s ease infinite;
}

body::after {
    content: "";
    position: fixed;
    inset: 0;
    z-index: -2;
    pointer-events: none;
    opacity: 0.28;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
    background-size: 64px 64px;
    mask-image: radial-gradient(circle at center, black, transparent 76%);
}

a {
    color: inherit;
    text-decoration: none;
}

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

button,
input,
textarea {
    font: inherit;
}

::selection {
    color: #04100d;
    background: var(--primary);
}

/* Layout */
.portfolio-shell {
    position: relative;
    min-height: 100vh;
    isolation: isolate;
    overflow: hidden;
}

.section-pad {
    width: min(100% - 32px, var(--container));
    margin-inline: auto;
    padding-block: 112px;
}

.section-heading {
    max-width: 760px;
    margin-bottom: var(--space-6);
}

.section-heading h2,
.contact-copy h2 {
    margin: 0;
    font-size: clamp(2rem, 5vw, 4.75rem);
    line-height: 1.02;
    letter-spacing: 0;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    margin: 0 0 var(--space-2);
    color: var(--primary);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.18em;
    text-transform: uppercase;
}

.eyebrow::before {
    content: "";
    width: 32px;
    height: 1px;
    background: currentColor;
}

.glass-panel,
.skill-card,
.project-card,
.timeline-card,
.achievement-card,
.cert-card,
.stat-card {
    border: 1px solid var(--line);
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.12), rgba(255, 255, 255, 0.045));
    box-shadow: var(--shadow);
    backdrop-filter: blur(22px);
}

/* Navigation */
.site-nav {
    position: fixed;
    top: 16px;
    left: 50%;
    z-index: 50;
    width: min(100% - 32px, var(--container));
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 999px;
    background: rgba(5, 7, 13, 0.58);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.28);
    backdrop-filter: blur(24px);
    transform: translateX(-50%);
    transition: border-color 220ms ease, background 220ms ease, box-shadow 220ms ease;
}

.site-nav.is-scrolled {
    border-color: var(--line-strong);
    background: rgba(5, 7, 13, 0.82);
}

.brand-mark {
    display: grid;
    width: 44px;
    height: 44px;
    place-items: center;
    border-radius: 50%;
    color: #05100e;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--accent));
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-menu a {
    padding: 12px 16px;
    border-radius: 999px;
    color: var(--soft);
    font-size: 0.92rem;
    transition: color 180ms ease, background 180ms ease;
}

.nav-menu a:hover,
.nav-menu a:focus-visible {
    color: var(--text);
    background: rgba(255, 255, 255, 0.1);
}

.nav-toggle {
    display: none;
    width: 44px;
    height: 44px;
    place-items: center;
    border: 0;
    border-radius: 50%;
    color: var(--text);
    background: rgba(255, 255, 255, 0.1);
    cursor: pointer;
}

/* Hero */
.hero {
    position: relative;
    display: grid;
    min-height: 100vh;
    align-items: center;
    padding-top: 144px;
    padding-bottom: 80px;
}

.hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
    gap: var(--space-8);
    align-items: center;
}

.hero-copy h1 {
    max-width: 760px;
    margin: 0;
    font-size: clamp(3.8rem, 9vw, 8.75rem);
    line-height: 0.88;
    letter-spacing: 0;
}

.hero-copy h1 span {
    color: transparent;
    background: linear-gradient(120deg, var(--primary), var(--secondary), var(--rose));
    background-clip: text;
    -webkit-background-clip: text;
}

.typing-line {
    display: flex;
    align-items: center;
    min-height: 40px;
    margin: var(--space-4) 0 var(--space-3);
    color: var(--soft);
    font-size: clamp(1.1rem, 2vw, 1.55rem);
    font-weight: 600;
}

.typing-cursor {
    display: inline-block;
    width: 2px;
    height: 1.25em;
    margin-left: 6px;
    background: var(--primary);
    animation: cursorBlink 900ms steps(2, start) infinite;
}

.hero-bio {
    max-width: 640px;
    margin: 0;
    color: var(--muted);
    font-size: 1.03rem;
    line-height: 1.8;
}

.hero-actions,
.social-row,
.project-actions,
.footer-links {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.hero-actions {
    margin-top: var(--space-4);
}

.btn {
    display: inline-flex;
    min-height: 48px;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 0 20px;
    border: 1px solid transparent;
    border-radius: 999px;
    font-weight: 700;
    transition: transform 180ms ease, border-color 180ms ease, background 180ms ease, box-shadow 180ms ease;
}

.btn:hover,
.btn:focus-visible {
    transform: translateY(-3px);
}

.btn-primary {
    color: #06110e;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    box-shadow: 0 16px 44px rgba(117, 244, 211, 0.22);
}

.btn-secondary,
.btn-ghost {
    color: var(--text);
    border-color: var(--line);
    background: rgba(255, 255, 255, 0.08);
}

.btn-secondary:hover,
.btn-ghost:hover {
    border-color: var(--line-strong);
    background: rgba(255, 255, 255, 0.13);
}

.social-row {
    margin-top: var(--space-4);
}

.social-row a,
.footer-links a,
.back-to-top {
    display: grid;
    width: 48px;
    height: 48px;
    place-items: center;
    border: 1px solid var(--line);
    border-radius: 50%;
    color: var(--soft);
    background: rgba(255, 255, 255, 0.07);
    transition: transform 180ms ease, color 180ms ease, border-color 180ms ease, background 180ms ease;
}

.social-row a:hover,
.footer-links a:hover,
.back-to-top:hover {
    color: var(--primary);
    border-color: rgba(117, 244, 211, 0.48);
    background: rgba(117, 244, 211, 0.1);
    transform: translateY(-3px);
}

.hero-visual {
    position: relative;
    min-height: 560px;
    display: grid;
    place-items: center;
}

.profile-frame {
    position: relative;
    z-index: 2;
    width: min(430px, 82vw);
    aspect-ratio: 1;
    padding: 12px;
    border-radius: 50%;
    background:
        linear-gradient(var(--bg), var(--bg)) padding-box,
        linear-gradient(140deg, var(--primary), var(--secondary), var(--rose)) border-box;
    border: 1px solid transparent;
    box-shadow:
        0 0 100px rgba(117, 244, 211, 0.22),
        0 36px 120px rgba(0, 0, 0, 0.52);
    animation: float 6s ease-in-out infinite;
}

.profile-frame img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
    background:
        radial-gradient(circle at 40% 28%, rgba(255, 255, 255, 0.28), transparent 14%),
        radial-gradient(circle at 50% 46%, rgba(255, 255, 255, 0.2), transparent 18%),
        linear-gradient(135deg, rgba(117, 244, 211, 0.34), rgba(142, 167, 255, 0.24), rgba(255, 122, 168, 0.22)),
        #121825;
}

.orbit-ring {
    position: absolute;
    width: min(510px, 92vw);
    aspect-ratio: 1;
    border: 1px solid rgba(255, 255, 255, 0.16);
    border-radius: 50%;
    animation: slowSpin 22s linear infinite;
}

.orbit-ring::before,
.orbit-ring::after {
    content: "";
    position: absolute;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--primary);
    box-shadow: 0 0 24px var(--primary);
}

.orbit-ring::before {
    top: 42px;
    left: 84px;
}

.orbit-ring::after {
    right: 54px;
    bottom: 72px;
    background: var(--rose);
    box-shadow: 0 0 24px var(--rose);
}

.floating-chip {
    position: absolute;
    z-index: 3;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    border: 1px solid var(--line);
    border-radius: 999px;
    color: var(--text);
    background: rgba(255, 255, 255, 0.11);
    box-shadow: 0 18px 48px rgba(0, 0, 0, 0.28);
    backdrop-filter: blur(16px);
    animation: float 5.5s ease-in-out infinite;
}

.chip-one {
    top: 92px;
    left: 28px;
}

.chip-two {
    right: 8px;
    top: 196px;
    animation-delay: 800ms;
}

.chip-three {
    left: 68px;
    bottom: 88px;
    animation-delay: 1400ms;
}

.mesh {
    position: absolute;
    z-index: -1;
    width: 260px;
    height: 260px;
    border-radius: 50%;
    filter: blur(24px);
    opacity: 0.3;
    pointer-events: none;
}

.mesh-one {
    top: 20%;
    left: -90px;
    background: var(--primary);
}

.mesh-two {
    right: -80px;
    bottom: 14%;
    background: var(--rose);
}

/* About */
.about-grid {
    display: grid;
    grid-template-columns: minmax(0, 0.95fr) minmax(340px, 1.05fr);
    gap: var(--space-4);
    align-items: stretch;
}

.about-story {
    padding: var(--space-5);
    border-radius: var(--radius-lg);
}

.about-story h3,
.project-content h3,
.timeline-card h3,
.achievement-card h3,
.cert-card h3 {
    margin: 0 0 var(--space-2);
    font-size: 1.4rem;
}

.about-story p,
.project-content p,
.timeline-card p,
.achievement-card p,
.cert-card p,
.contact-copy p {
    color: var(--muted);
    line-height: 1.75;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-2);
}

.stat-card {
    min-height: 168px;
    padding: var(--space-4);
    border-radius: var(--radius-md);
}

.stat-value {
    display: block;
    color: var(--primary);
    font-size: clamp(2.2rem, 5vw, 4rem);
    font-weight: 800;
    line-height: 1;
}

.stat-label {
    display: block;
    margin-top: var(--space-2);
    color: var(--soft);
    font-weight: 600;
}

/* Skills */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: var(--space-2);
}

.skill-card {
    position: relative;
    min-height: 176px;
    padding: var(--space-3);
    border-radius: var(--radius-md);
    overflow: hidden;
    transform-style: preserve-3d;
    transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.skill-card::after,
.project-card::after {
    content: "";
    position: absolute;
    inset: auto -30% -48% -30%;
    height: 120px;
    background: radial-gradient(circle, rgba(117, 244, 211, 0.28), transparent 68%);
    opacity: 0;
    transition: opacity 220ms ease;
}

.skill-card:hover,
.project-card:hover {
    border-color: rgba(117, 244, 211, 0.34);
}

.skill-card:hover::after,
.project-card:hover::after {
    opacity: 1;
}

.skill-icon {
    display: grid;
    width: 52px;
    height: 52px;
    place-items: center;
    border-radius: 50%;
    color: #06110e;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
}

.skill-card h3 {
    position: relative;
    z-index: 1;
    margin: var(--space-4) 0 0;
    font-size: 1.08rem;
}

/* Projects */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-3);
}

.project-card {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    transform-style: preserve-3d;
    transition: transform 180ms ease, border-color 180ms ease;
}

.project-content {
    position: relative;
    z-index: 1;
    padding: var(--space-4);
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-1);
    margin: var(--space-3) 0;
}

.tech-stack span {
    padding: 8px 12px;
    border: 1px solid var(--line);
    border-radius: 999px;
    color: var(--soft);
    font-size: 0.82rem;
    background: rgba(255, 255, 255, 0.07);
}

.project-actions a {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    min-height: 42px;
    padding: 0 14px;
    border: 1px solid var(--line);
    border-radius: 999px;
    color: var(--text);
    background: rgba(255, 255, 255, 0.07);
    transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.project-actions a:hover {
    border-color: rgba(117, 244, 211, 0.42);
    background: rgba(117, 244, 211, 0.1);
    transform: translateY(-2px);
}

/* Timeline */
.timeline {
    position: relative;
    display: grid;
    gap: var(--space-4);
    max-width: 860px;
}

.timeline::before {
    content: "";
    position: absolute;
    top: 8px;
    bottom: 8px;
    left: 15px;
    width: 2px;
    background: linear-gradient(var(--primary), var(--secondary), var(--rose));
}

.timeline-item {
    position: relative;
    display: grid;
    grid-template-columns: 32px minmax(0, 1fr);
    gap: var(--space-3);
}

.timeline-dot {
    position: relative;
    z-index: 1;
    width: 32px;
    height: 32px;
    border: 8px solid var(--bg);
    border-radius: 50%;
    background: var(--primary);
    box-shadow: 0 0 32px rgba(117, 244, 211, 0.38);
}

.timeline-card {
    padding: var(--space-4);
    border-radius: var(--radius-md);
}

.timeline-date {
    margin: 0 0 var(--space-1);
    color: var(--primary);
    font-size: 0.82rem;
    font-weight: 700;
    text-transform: uppercase;
}

/* Achievements and Certifications */
.achievement-list {
    display: grid;
    gap: var(--space-2);
}

.achievement-card {
    display: grid;
    grid-template-columns: 56px minmax(0, 1fr);
    gap: var(--space-3);
    align-items: start;
    padding: var(--space-4);
    border-radius: var(--radius-md);
}

.achievement-card > i,
.cert-card > i {
    display: grid;
    width: 56px;
    height: 56px;
    place-items: center;
    border-radius: 50%;
    color: #06110e;
    background: linear-gradient(135deg, var(--accent), var(--primary));
}

.cert-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-3);
}

.cert-card {
    padding: var(--space-4);
    border-radius: var(--radius-md);
}

/* Contact */
.contact-card {
    display: grid;
    grid-template-columns: minmax(0, 0.95fr) minmax(320px, 1.05fr);
    gap: var(--space-6);
    padding: var(--space-6);
    border-radius: var(--radius-lg);
}

.contact-copy a {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    margin-top: var(--space-3);
    color: var(--primary);
    font-weight: 700;
}

.contact-form {
    display: grid;
    gap: var(--space-2);
}

.contact-form label {
    color: var(--soft);
    font-size: 0.9rem;
    font-weight: 700;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    color: var(--text);
    background: rgba(255, 255, 255, 0.08);
    outline: none;
    transition: border-color 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

.contact-form input {
    min-height: 52px;
    padding: 0 16px;
}

.contact-form textarea {
    resize: vertical;
    padding: 14px 16px;
}

.contact-form input:focus,
.contact-form textarea:focus {
    border-color: rgba(117, 244, 211, 0.62);
    background: rgba(255, 255, 255, 0.11);
    box-shadow: 0 0 0 4px rgba(117, 244, 211, 0.1);
}

.contact-form button {
    margin-top: var(--space-2);
    border: 0;
    cursor: pointer;
}

/* Footer */
.site-footer {
    width: min(100% - 32px, var(--container));
    margin: 0 auto;
    padding: var(--space-5) 0 var(--space-6);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    color: var(--muted);
}

.site-footer p {
    margin: 0;
}

.back-to-top {
    position: fixed;
    right: 24px;
    bottom: 24px;
    z-index: 40;
    opacity: 0;
    pointer-events: none;
}

.back-to-top.is-visible {
    opacity: 1;
    pointer-events: auto;
}

/* Motion */
.tilt-card {
    will-change: transform;
}

@keyframes gradientShift {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

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

@keyframes float {
    0%,
    100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-14px);
    }
}

@keyframes slowSpin {
    to {
        transform: rotate(360deg);
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 1ms !important;
        animation-iteration-count: 1 !important;
        scroll-behavior: auto !important;
        transition-duration: 1ms !important;
    }
}

/* Responsive */
@media (max-width: 1024px) {
    .hero-grid,
    .about-grid,
    .contact-card {
        grid-template-columns: 1fr;
    }

    .hero-visual {
        min-height: 500px;
        order: -1;
    }

    .skills-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .cert-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 760px) {
    .section-pad {
        width: min(100% - 24px, var(--container));
        padding-block: 80px;
    }

    .site-nav {
        align-items: flex-start;
        border-radius: 28px;
    }

    .nav-toggle {
        display: grid;
    }

    .nav-menu {
        position: absolute;
        top: 62px;
        left: 0;
        right: 0;
        display: none;
        flex-direction: column;
        align-items: stretch;
        padding: 8px;
        border: 1px solid var(--line);
        border-radius: 24px;
        background: rgba(5, 7, 13, 0.92);
        backdrop-filter: blur(22px);
    }

    .nav-menu.is-open {
        display: flex;
    }

    .nav-menu a {
        width: 100%;
    }

    .hero {
        min-height: auto;
        padding-top: 128px;
    }

    .hero-copy h1 {
        font-size: clamp(3.15rem, 17vw, 5rem);
    }

    .hero-visual {
        min-height: 390px;
    }

    .floating-chip {
        font-size: 0.84rem;
    }

    .chip-one {
        left: 0;
        top: 64px;
    }

    .chip-two {
        right: 0;
        top: 148px;
    }

    .chip-three {
        left: 22px;
        bottom: 54px;
    }

    .skills-grid,
    .projects-grid,
    .stats-grid,
    .cert-grid {
        grid-template-columns: 1fr;
    }

    .contact-card,
    .about-story,
    .project-content,
    .timeline-card,
    .achievement-card,
    .cert-card,
    .stat-card {
        padding: var(--space-3);
    }

    .achievement-card {
        grid-template-columns: 1fr;
    }

    .site-footer {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 460px) {
    .hero-actions .btn {
        width: 100%;
    }

    .hero-copy h1 {
        font-size: 3.35rem;
    }

    .section-heading h2,
    .contact-copy h2 {
        font-size: 2.45rem;
    }

    .profile-frame {
        width: min(310px, 82vw);
    }

    .orbit-ring {
        width: min(350px, 92vw);
    }
}