:root {
    --color-bg: #ffffff;
    --color-bg-secondary: #f9fafb;
    --color-text: #1a1a2e;
    --color-text-muted: #555;
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-border: #e5e7eb;
    --color-card-bg: #f9fafb;
    --color-header-bg: linear-gradient(135deg, #1e3a5f 0%, #2563eb 100%);
    --color-header-text: #ffffff;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
    --color-bg: #11191f;
    --color-bg-secondary: #1a2634;
    --color-text: #e2e2e5;
    --color-text-muted: #a3a3a3;
    --color-primary: #4d8fec;
    --color-primary-hover: #6aa3f0;
    --color-border: #2a3a4a;
    --color-card-bg: #1a2634;
    --color-header-bg: linear-gradient(135deg, #0d1520 0%, #1a3a5c 100%);
    --color-header-text: #e2e2e5;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

* {
    margin: 0;
    padding: 0;
}

html {
    height: 100%;
}

body {
    font-family:
        -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu,
        Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    transition:
        background-color 0.3s ease,
        color 0.3s ease;
    display: flex;
    flex-direction: column;
    height: 100%;
}

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

a:hover {
    text-decoration: underline;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Header / Hero */
header {
    background: var(--color-header-bg);
    color: var(--color-header-text);
    padding: 1rem 0 1rem;
    position: relative;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding-bottom: 1rem;
    gap: 1rem;
}

.header-top h1 {
    font-size: 4rem;
    line-height: 4rem;
    margin-right: auto;
}

.header-top img {
    border-radius: 15%;
    height: 4rem;
}

/* Theme toggle button */
.theme-toggle {
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.25);
    color: var(--color-header-text);
    padding: 0.5rem 0.75rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1.25rem;
    transition: background 0.2s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    align-self: flex-start;
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.25);
}

.theme-toggle .label {
    font-size: 0.85rem;
    font-weight: 500;
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
    display: none;
}

[data-theme="dark"] .theme-toggle .icon-moon {
    display: inline;
}

:root:not([data-theme="dark"]) .theme-toggle .icon-sun,
html:not([data-theme]) .theme-toggle .icon-sun {
    display: inline;
}

header .tagline {
    font-size: 1.2rem;
    opacity: 0.9;
    margin-bottom: 1.5rem;
    max-width: 600px;
}

.contact-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.contact-links a {
    color: var(--color-header-text);
    background: rgba(255, 255, 255, 0.15);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-size: 0.9rem;
    transition: background 0.2s;
}

.contact-links a:hover {
    background: rgba(255, 255, 255, 0.25);
    text-decoration: none;
}

/* Main content */
main {
    padding: 3rem 0;
    flex: 2;
}

section {
    margin-bottom: 1rem;
}

section h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--color-primary);
    display: inline-block;
}

section > p {
    color: var(--color-text-muted);
    margin-bottom: 1rem;
}

/* Skills */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.skill-category {
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 1.25rem;
    box-shadow: var(--shadow);
    transition:
        background-color 0.3s ease,
        border-color 0.3s ease;
}

.skill-category h3 {
    font-size: 1rem;
    margin-bottom: 0.75rem;
    color: var(--color-primary);
}

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

.skill-category li {
    padding: 0.25rem 0;
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

/* Experience */
.job {
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow);
    transition:
        background-color 0.3s ease,
        border-color 0.3s ease;
}

.job-header {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.job h3 {
    font-size: 1.1rem;
    color: var(--color-text);
}

.job .company {
    color: var(--color-primary);
    font-weight: 500;
}

.job .dates {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.job ul {
    margin-left: 1.25rem;
    color: var(--color-text-muted);
}

.job li {
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

/* Education */
.education-item {
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 1.25rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow);
    transition:
        background-color 0.3s ease,
        border-color 0.3s ease;
}

.education-item h3 {
    font-size: 1.05rem;
    margin-bottom: 0.25rem;
}

.education-item .degree {
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

.education-header {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.education-item .dates {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.education-item ul {
    margin-left: 1.25rem;
    margin-top: 0.75rem;
    color: var(--color-text-muted);
}

.education-item li {
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

/* Certifications list */
.cert-list {
    margin-left: 1.25rem;
    color: var(--color-text-muted);
}

.cert-list li {
    margin-bottom: 0.5rem;
}

footer {
    position: relative;
    bottom: 0;
    width: 100%;
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: 2rem 0;
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.9rem;
    transition:
        background-color 0.3s ease,
        border-color 0.3s ease;
}

footer a {
    margin: 0 0.5rem;
}

/* Responsive */
@media (max-width: 600px) {
    .header-top {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    .header-top h1 {
        font-size: 2rem;
        line-height: 0.5rem;
    }

    header .tagline {
        font-size: 1.05rem;
    }

    .job-header {
        flex-direction: column;
    }

    .theme-toggle .label {
        display: none;
    }
}