.about-page {
    max-width: var(--max-content);
    margin: 0 auto;
    padding: 3rem 0;
}

.about-hero {
    margin-bottom: 2.5rem;
    padding-bottom: 2.5rem;
    border-bottom: 1px solid var(--color-border);
}

.about-hero__title {
    margin: 0 0 0.75rem;
    font-size: clamp(1.75rem, 4vw, 2.25rem);
    font-weight: 700;
    letter-spacing: -0.03em;
}

.about-hero__text {
    margin: 0;
    max-width: 560px;
    font-size: 0.9375rem;
    line-height: 1.75;
    color: var(--color-text-secondary);
}

.about-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
    margin-bottom: 2rem;
}

.about-tab {
    padding: 0.5rem 0.875rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: transparent;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-text-muted);
    cursor: pointer;
    transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.about-tab:hover {
    color: var(--color-text-secondary);
    border-color: var(--color-border-strong);
}

.about-tab--active {
    color: var(--color-text);
    border-color: var(--color-border-strong);
    background: rgba(255, 255, 255, 0.05);
}

.about-timeline-wrap {
    padding: 0.5rem 0;
}

/* ── Experience timeline ── */

.experience-timeline {
    display: flex;
    flex-direction: column;
}

.experience-item {
    display: grid;
    grid-template-columns: 24px 1fr;
    gap: 1.25rem;
}

.experience-item__track {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-top: 0.35rem;
}

.experience-item__dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    border: 2px solid var(--color-accent);
    background: var(--color-bg);
    flex-shrink: 0;
}

.experience-item__line {
    flex: 1;
    width: 1px;
    min-height: 2rem;
    margin-top: 0.5rem;
    background: var(--color-border);
}

.experience-item__body {
    padding-bottom: 2.5rem;
}

.experience-item--last .experience-item__body {
    padding-bottom: 0;
}

.experience-item__date {
    display: block;
    margin-bottom: 0.375rem;
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    font-weight: 500;
    color: var(--color-accent);
    letter-spacing: 0.02em;
}

.experience-item__role {
    margin: 0 0 0.25rem;
    font-size: 1.0625rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--color-text);
}

.experience-item__org {
    margin: 0 0 0.875rem;
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.experience-item__link {
    display: inline-block;
    margin-bottom: 0.875rem;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color 0.15s ease;
}

.experience-item__link:hover {
    color: var(--color-accent);
}

.experience-item__cert {
    display: block;
    margin-bottom: 0.875rem;
    max-width: 200px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: border-color 0.15s ease;
}

.experience-item__cert:hover {
    border-color: var(--color-border-strong);
}

.experience-item__cert img {
    display: block;
    width: 100%;
}

.experience-item__list {
    margin: 0;
    padding: 0 0 0 1rem;
    list-style: none;
}

.experience-item__list li {
    position: relative;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    line-height: 1.65;
    color: var(--color-text-secondary);
}

.experience-item__list li::before {
    content: "—";
    position: absolute;
    left: -1rem;
    color: var(--color-text-muted);
    font-family: var(--font-mono);
    font-size: 0.75rem;
}

/* ── Contact ── */

.contact-container {
    display: flex;
    flex-direction: column;
    max-width: 440px;
    margin: 3rem auto 2rem;
    padding: 0;
}

.get-in-touch {
    position: relative;
    display: block;
    width: 100%;
    left: unset;
    padding: 0;
    margin-bottom: 0.5rem;
    background: none;
    border: none;
    box-shadow: none;
    font-size: clamp(1.75rem, 4vw, 2.25rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    color: var(--color-text);
    text-align: left;
}

.contact-form {
    margin-top: 1.5rem;
    padding: 0;
    width: 100%;
    background: none;
    border: none;
    box-shadow: none;
}

.input-field {
    margin-bottom: 1rem;
}

.message-textarea {
    width: 100%;
    min-height: 140px;
    resize: vertical;
    padding: 0.75rem;
    margin-bottom: 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-bg-subtle);
    color: var(--color-text);
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    line-height: 1.6;
    transition: border-color 0.15s ease;
}

.message-textarea:focus {
    outline: none;
    border-color: var(--color-border-strong);
}

.message-textarea::placeholder {
    color: var(--color-text-muted);
}

.submit-contact {
    display: flex;
    margin-top: 0.5rem;
    justify-content: flex-start;
    width: 100%;
}

.contact-form .MuiOutlinedInput-root {
    background: var(--color-bg-subtle);
    font-family: var(--font-mono);
    font-size: 0.8125rem;
}

.contact-form .MuiOutlinedInput-notchedOutline {
    border-color: var(--color-border) !important;
}

.contact-form .MuiOutlinedInput-root:hover .MuiOutlinedInput-notchedOutline {
    border-color: var(--color-border-strong) !important;
}

.contact-form
    .MuiOutlinedInput-root.Mui-focused
    .MuiOutlinedInput-notchedOutline {
    border-color: var(--color-border-strong) !important;
    border-width: 1px !important;
}

.contact-form .MuiInputLabel-root {
    color: var(--color-text-muted);
    font-family: var(--font-mono);
    font-size: 0.8125rem;
}

.contact-form .MuiInputBase-input {
    color: var(--color-text);
}

.contact-form .MuiButton-contained {
    background: var(--color-text) !important;
    color: var(--color-bg) !important;
    font-family: var(--font-mono) !important;
    box-shadow: none !important;
    text-transform: none !important;
    font-weight: 500 !important;
    font-size: 0.8125rem !important;
    padding: 0.5rem 1.25rem !important;
    border-radius: var(--radius-sm) !important;
}

.contact-form .MuiButton-contained:hover {
    background: var(--color-text-secondary) !important;
}

.contact-form .MuiButton-contained.Mui-disabled {
    background: var(--color-surface) !important;
    color: var(--color-text-muted) !important;
}

@media (max-width: 768px) {
    .about-page {
        padding: 2rem 0;
    }
}