/* ------------------------------
   DESIGN TOKENS / VARIABLES
--------------------------------*/
:root {
    --bg: #020617;              /* page background */
    --bg-alt: #020617;          /* lighter background if needed */
    --surface: #020617;         /* cards / sections */
    --border-subtle: rgba(148, 163, 184, 0.35);

    --text-main: #e5e7eb;
    --text-muted: #9ca3af;
    --text-strong: #f9fafb;

    --accent: #22c55e;          /* main accent (green) */
    --accent-soft: rgba(34, 197, 94, 0.15);

    --radius-lg: 16px;
    --radius-md: 10px;
    --shadow-soft: 0 18px 40px rgba(15, 23, 42, 0.8);
    --shadow-subtle: 0 8px 25px rgba(15, 23, 42, 0.6);
}

/* ------------------------------
   GENERAL STYLES
--------------------------------*/
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    scroll-behavior: smooth;
    font-family: "Poppins", sans-serif;
}

body {
    background: radial-gradient(circle at top, #0f172a 0, var(--bg) 45%);
    color: var(--text-main);
    line-height: 1.7;
}

.section,
.section-light {
    padding: 70px 8%;
    max-width: 1120px;
    margin: 40px auto;
    background: radial-gradient(circle at top left, rgba(15, 23, 42, 0.9), var(--surface));
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-subtle);
}

.section-light {
    background: radial-gradient(circle at top right, rgba(15, 23, 42, 0.95), var(--surface));
}

.section h2 {
    font-size: 32px;
    color: var(--text-strong);
    text-align: center;
    margin-bottom: 30px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

/* Add offset for sticky header when using anchors */
section[id] {
    scroll-margin-top: 90px;
}

/* ------------------------------
   NAVIGATION
--------------------------------*/
header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(2, 6, 23, 0.9);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid rgba(15, 23, 42, 0.8);
    box-shadow: 0 12px 30px rgba(15, 23, 42, 0.6);
}

nav {
    max-width: 1120px;
    margin: 0 auto;
    padding: 12px 8%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

nav .logo {
    color: var(--text-strong);
    font-size: 24px;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    justify-content: flex-end;
}

nav ul li a {
    color: var(--text-muted);
    font-weight: 500;
    text-decoration: none;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding-bottom: 4px;
    border-bottom: 2px solid transparent;
    transition: color 0.25s ease, border-color 0.25s ease, transform 0.2s ease;
}

nav ul li a:hover,
nav ul li a:focus {
    color: var(--accent);
    border-color: var(--accent);
    transform: translateY(-1px);
}

/* ------------------------------
   HERO SECTION
--------------------------------*/
.hero {
    max-width: 1120px;
    margin: 70px auto 30px;
    padding: 60px 8%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 50px;
    border-radius: var(--radius-lg);
    background: radial-gradient(circle at top left, rgba(15, 23, 42, 0.95), #020617);
    border: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-soft);
}

.hero-img img {
    width: 260px;
    height: 260px;
    object-fit: cover;
    border-radius: 999px;
    border: 3px solid rgba(148, 163, 184, 0.3);
    box-shadow: 0 18px 50px rgba(15, 23, 42, 0.9);
    animation: fadeIn 1.5s ease-out;
}

.hero-text {
    max-width: 550px;
}

.hero-text h1 {
    font-size: 32px;
    color: var(--text-strong);
    line-height: 1.3;
    margin-bottom: 12px;
}

.hero-text h1 span {
    color: var(--accent);
}

.hero-text h3 {
    font-size: 18px;
    font-weight: 400;
    margin-bottom: 24px;
    color: var(--text-muted);
}

.hero-text p {
    margin-bottom: 26px;
    color: var(--text-muted);
}

/* BUTTONS */
.btn-primary,
.btn-secondary {
    display: inline-block;
    padding: 12px 22px;
    border-radius: 999px;
    font-size: 14px;
    text-decoration: none;
    margin-right: 12px;
    margin-top: 6px;
    transition: 0.25s ease;
    font-weight: 500;
}

.btn-primary {
    background: var(--accent);
    color: #020617;
    box-shadow: 0 12px 30px var(--accent-soft);
}

.btn-primary:hover {
    filter: brightness(1.07);
    transform: translateY(-1px);
    box-shadow: 0 16px 36px var(--accent-soft);
}

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

.btn-secondary:hover {
    background: var(--accent-soft);
}

/* ------------------------------
   ABOUT
--------------------------------*/
.section p {
    font-size: 16px;
    color: var(--text-muted);
    text-align: center;
    line-height: 1.8;
    max-width: 720px;
    margin: 0 auto;
}

/* ------------------------------
   SKILLS
--------------------------------*/
.skill-group {
    background: rgba(15, 23, 42, 0.9);
    border-radius: var(--radius-md);
    padding: 20px 22px;
    margin-bottom: 20px;
    transition: 0.25s ease;
    border: 1px solid rgba(51, 65, 85, 0.8);
}

.skill-group:hover {
    border-color: var(--accent);
    background: radial-gradient(circle at top left, rgba(34, 197, 94, 0.08), rgba(15, 23, 42, 0.95));
    transform: translateY(-2px);
}

.skill-group h3 {
    color: var(--text-strong);
    font-size: 18px;
    margin-bottom: 8px;
}

.skill-group ul {
    list-style: none;
}

.skill-group ul li {
    margin-bottom: 6px;
    color: var(--text-muted);
    font-size: 14px;
}

/* ------------------------------
   SERVICES
--------------------------------*/
.service-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 20px;
}

.card {
    background: rgba(15, 23, 42, 0.92);
    padding: 24px 22px;
    border-radius: var(--radius-md);
    text-align: left;
    transition: 0.25s ease;
    border: 1px solid rgba(51, 65, 85, 0.85);
}

.card:hover {
    background: radial-gradient(circle at top left, rgba(34, 197, 94, 0.1), rgba(15, 23, 42, 0.95));
    transform: translateY(-4px);
    border-color: var(--accent);
}

.card h3 {
    color: var(--text-strong);
    margin-bottom: 8px;
    font-size: 18px;
}

.card p {
    color: var(--text-muted);
    font-size: 14px;
}

/* ------------------------------
   EXPERIENCE & EDUCATION
--------------------------------*/
.exp-item {
    background: rgba(15, 23, 42, 0.92);
    padding: 20px 22px;
    border-radius: var(--radius-md);
    margin-bottom: 16px;
    border: 1px solid rgba(51, 65, 85, 0.85);
    transition: 0.25s ease;
}

.exp-item:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

.exp-item h3 {
    color: var(--text-strong);
    margin-bottom: 6px;
    font-size: 16px;
}

.exp-item p {
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 6px;
}

.exp-item ul {
    margin-left: 18px;
    margin-top: 4px;
}

.exp-item ul li {
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 4px;
}

/* ------------------------------
   CERTIFICATIONS
--------------------------------*/
.cert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 20px;
}

.cert-card {
    background: rgba(15, 23, 42, 0.92);
    padding: 24px 22px;
    border-radius: var(--radius-md);
    text-align: left;
    border: 1px solid rgba(51, 65, 85, 0.85);
    transition: 0.25s ease;
}

.cert-card:hover {
    border-color: var(--accent);
    transform: translateY(-3px);
    background: radial-gradient(circle at top left, rgba(34, 197, 94, 0.08), rgba(15, 23, 42, 0.96));
}

.cert-card h3 {
    color: var(--text-strong);
    margin-bottom: 12px;
    font-size: 16px;
}

.cert-card .btn-primary,
.cert-card .btn-secondary {
    margin-top: 10px;
}

/* ------------------------------
   PORTFOLIO
--------------------------------*/
.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 20px;
}

.portfolio-card {
    background: rgba(15, 23, 42, 0.92);
    padding: 20px 22px;
    border-radius: var(--radius-md);
    text-align: left;
    color: var(--text-main);
    text-decoration: none;
    transition: 0.25s ease;
    border: 1px solid rgba(51, 65, 85, 0.85);
    font-size: 14px;
}

.portfolio-card:hover {
    border-color: var(--accent);
    background: radial-gradient(circle at top left, rgba(34, 197, 94, 0.1), rgba(15, 23, 42, 0.96));
    transform: translateY(-3px);
}

/* ------------------------------
   CONTACT
--------------------------------*/
#contact p {
    text-align: center;
    font-size: 16px;
    margin-bottom: 10px;
    color: var(--text-muted);
}

#contact a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
}

#contact a:hover {
    text-decoration: underline;
}

/* ------------------------------
   FOOTER
--------------------------------*/
footer {
    text-align: center;
    padding: 24px 8%;
    color: var(--text-muted);
    font-size: 14px;
    margin-top: 40px;
}

/* ------------------------------
   ANIMATIONS
--------------------------------*/
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ------------------------------
   RESPONSIVE
--------------------------------*/
@media (max-width: 900px) {
    .hero {
        flex-direction: column;
        padding: 40px 8%;
        text-align: center;
    }

    .hero-text {
        text-align: center;
    }

    .hero-img img {
        width: 220px;
        height: 220px;
    }

    nav {
        flex-direction: column;
        align-items: flex-start;
    }

    nav ul {
        justify-content: flex-start;
    }
}

@media (max-width: 600px) {
    .section,
    .section-light {
        padding: 50px 6%;
        margin: 30px 4%;
    }

    .hero {
        margin: 60px 4% 20px;
        padding: 32px 6%;
    }

    nav {
        padding-inline: 6%;
    }
}