/* ============================================================
1. CUSTOM PROPERTIES
   ============================================================ */
:root {
    --color-navy: #0C447C;
    --color-navy-deep: #1F3864;
    --color-navy-mid: #185FA5;
    --color-navy-light: #378ADD;
    --color-navy-tint: #E6F1FB;

    --color-text-primary: #0F1923;
    --color-text-secondary: #4A5568;
    --color-text-tertiary: #8A96A3;

    --color-bg: #FFFFFF;
    --color-bg-subtle: #F7F9FC;
    --color-border: #E2E8F0;
    --color-border-light: #EEF2F7;

    --font-sans: 'DM Sans', sans-serif;

    --nav-height: 64px;

    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 40px;
    --space-2xl: 64px;

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --transition: 200ms ease;
}


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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text-primary);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
}

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

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

button {
    font-family: inherit;
    cursor: pointer;
}

/* ============================================================
3. NAV
   ============================================================ */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border-light);
    transition: box-shadow var(--transition);
}

.nav.scrolled {
    box-shadow: 0 1px 12px rgba(0, 0, 0, 0.06);
}

.nav-brand {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-navy);
    letter-spacing: -0.01em;
    transition: color var(--transition);
}

.nav-brand:hover {
    color: var(--color-navy-deep);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.nav-links a {
    font-size: 13.5px;
    font-weight: 400;
    color: var(--color-text-secondary);
    transition: color var(--transition);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1.5px;
    background: var(--color-navy);
    transition: width var(--transition);
}

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

.nav-links a:hover::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 36px;
    height: 36px;
    background: none;
    border: none;
    padding: 4px;
    cursor: pointer;
}

.nav-toggle span {
    display: block;
    width: 22px;
    height: 1.5px;
    background: var(--color-navy);
    border-radius: 2px;
    transition: transform 300ms ease, opacity 200ms ease;
    transform-origin: center;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(6.5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-6.5px) rotate(-45deg);
}

/* ---- Mobile nav ---- */
@media (max-width: 768px) {
    .nav {
        padding: 0 20px;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: flex-start;
        gap: 0;
        padding: 12px 0 20px;
        background: rgba(255, 255, 255, 0.98);
        border-bottom: 1px solid var(--color-border);
        opacity: 0;
        transform: translateY(-8px);
        pointer-events: none;
        transition: opacity 250ms ease, transform 250ms ease;
    }

    .nav-links.nav-open {
        opacity: 1;
        transform: translateY(0);
        pointer-events: auto;
    }

    .nav-links a {
        width: 100%;
        padding: 14px 20px;
        font-size: 15px;
        border-bottom: 1px solid var(--color-border-light);
    }

    .nav-links a::after {
        display: none;
    }
}

/* ============================================================
4. HERO
   ============================================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 56px;
}

.hero-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 48px 32px;
    width: 100%;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.hero-name {
    font-size: 72px;
    font-weight: 700;
    color: #0F1923;
    line-height: 1.05;
    letter-spacing: -0.03em;
    margin-bottom: 24px;
}

.hero-tagline {
    font-size: 24px;
    font-weight: 500;
    color: var(--color-navy-deep);
    line-height: 1.4;
    margin-bottom: 24px;
}

.hero-body {
    font-size: 17px;
    color: #333333;
    line-height: 1.7;
    margin-bottom: 40px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.hero-ctas {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.btn-filled,
.btn-ghost {
    display: inline-block;
    padding: 12px 32px;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 500;
    letter-spacing: 0.01em;
    transition: background var(--transition), color var(--transition),
        border-color var(--transition), transform var(--transition),
        box-shadow var(--transition);
}

.btn-filled {
    background: var(--color-navy-deep);
    color: #ffffff;
    border: 1.5px solid var(--color-navy-deep);
}

.btn-filled:hover {
    background: var(--color-navy);
    border-color: var(--color-navy);
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(12, 68, 124, 0.25);
}

.btn-ghost {
    background: transparent;
    color: var(--color-navy-deep);
    border: 1.5px solid var(--color-navy-deep);
}

.btn-ghost:hover {
    background: var(--color-navy-tint);
    transform: translateY(-1px);
}

.hero-right {
    display: flex;
    justify-content: center;
}

.hero-photo {
    width: 360px;
    height: 360px;
    border-radius: 50%;
    background: #E5E7EB;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-photo span {
    font-size: 14px;
    color: var(--color-text-tertiary);
}

.hero-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
    object-position: center 20%;
}

/* ---- Hero mobile ---- */
@media (max-width: 768px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero-right {
        order: -1;
    }

    .hero-name {
        font-size: 44px;
    }

    .hero-tagline {
        font-size: 18px;
    }

    .hero-body {
        font-size: 15px;
    }

    .hero-photo {
        width: 200px;
        height: 200px;
    }

    .hero-container {
        padding: 48px 20px;
    }
}

/* ============================================================
5. ABOUT + SKILLS
   ============================================================ */

.about {
    border-top: 1px solid var(--color-border);
    padding: 80px 0;
}

.about-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 32px;
    width: 100%;
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: start;
}

/* ---- Shared section title ---- */
.section-title {
    font-size: 32px;
    font-weight: 700;
    color: var(--color-navy-deep);
    letter-spacing: -0.02em;
    margin-bottom: 28px;
}

/* ---- About left column ---- */
.about-body {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.about-body p {
    font-size: 15px;
    color: var(--color-text-secondary);
    line-height: 1.8;
}

/* ---- Skills right column ---- */
.skills-list {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.skill-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.skill-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-navy-mid);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.skill-value {
    font-size: 15px;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ---- Mobile ---- */
@media (max-width: 768px) {
    .about {
        padding: 60px 0;
    }

    .about-container {
        padding: 0 20px;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .section-title {
        font-size: 26px;
    }
}

/* ============================================================
6. PROJECTS
   ============================================================ */
.projects {
    border-top: 1px solid var(--color-border);
    padding: 80px 0;
}

.projects-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 32px;
    width: 100%;
}

.projects-header {
    margin-bottom: 48px;
}

.projects-subtitle {
    font-size: 15px;
    color: var(--color-text-secondary);
    margin-top: 8px;
}

.projects-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

/* ---- Base card ---- */
.proj-card {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--color-bg);
    transition: box-shadow var(--transition), transform var(--transition);
}

.proj-card:hover {
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
    transform: translateY(-2px);
}

/* ---- Dashed card (in-progress) ---- */
.proj-card-dashed {
    border: 2px dashed var(--color-navy-light);
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--color-bg);
}

/* ---- Card image area ---- */
.proj-img {
    height: 160px;
    background: var(--color-bg-subtle);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-tertiary);
}

.proj-img-dashed {
    height: 160px;
    background: var(--color-navy-tint);
    border-bottom: 2px dashed var(--color-navy-light);
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ---- Card body ---- */
.proj-body {
    padding: 20px;
}

.proj-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.proj-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-text-primary);
}

.proj-status {
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 0.06em;
    color: var(--color-text-tertiary);
}

.status-live {
    color: #3B6D11;
    background: #EAF3DE;
    padding: 2px 8px;
    border-radius: var(--radius-sm);
}

.status-progress {
    color: var(--color-navy-mid);
    background: var(--color-navy-tint);
    padding: 2px 8px;
    border-radius: var(--radius-sm);
}

.proj-desc {
    font-size: 13px;
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: 10px;
}

.proj-stack {
    font-size: 12px;
    color: var(--color-navy-mid);
    margin-bottom: 16px;
}

.proj-stack-tbd {
    color: var(--color-text-tertiary);
}

/* ---- Card buttons ---- */
.proj-btns {
    display: flex;
    gap: 8px;
}

.proj-btn-ghost {
    font-size: 13px;
    padding: 7px 16px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    background: transparent;
    transition: background var(--transition), border-color var(--transition);
}

.proj-btn-ghost:hover {
    background: var(--color-bg-subtle);
    border-color: var(--color-border);
}

.proj-btn-filled {
    font-size: 13px;
    padding: 7px 16px;
    border: none;
    border-radius: var(--radius-sm);
    color: #ffffff;
    background: var(--color-navy);
    transition: background var(--transition);
}

.proj-btn-filled:hover {
    background: var(--color-navy-deep);
}

.btn-disabled {
    opacity: 0.4;
    cursor: default;
    pointer-events: none;
}

/* ---- Mobile ---- */
@media (max-width: 768px) {
    .projects {
        padding: 60px 0;
    }

    .projects-container {
        padding: 0 20px;
    }

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

/* ============================================================
7. CONTACT
   ============================================================ */
.contact {
    border-top: 1px solid var(--color-border);
    padding: 80px 0;
    background: var(--color-bg-subtle);
    text-align: center;
}

.contact-container {
    max-width: 600px;
    margin: 0 auto;
    padding: 0 32px;
}

.contact .section-title {
    font-size: 40px;
    margin-bottom: 16px;
}

.contact-sub {
    font-size: 15px;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 28px;
}

.contact-email {
    display: block;
    font-size: 16px;
    font-weight: 500;
    color: var(--color-navy-mid);
    margin-bottom: 20px;
    transition: color var(--transition);
}

.contact-email:hover {
    color: var(--color-navy-deep);
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
}

.contact-links a {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-navy-mid);
    transition: color var(--transition);
}

.contact-links a:hover {
    color: var(--color-navy-deep);
}


/* ============================================================
    8. FOOTER
     ============================================================ */
.footer {
    border-top: 1px solid var(--color-border);
    padding: 20px 32px;
    text-align: center;
}

.footer p {
    font-size: 12px;
    color: var(--color-text-tertiary);
}

/* ---- Mobile ---- */
@media (max-width: 768px) {
    .contact {
        padding: 60px 0;
    }

    .contact-container {
        padding: 0 20px;
    }

    .contact .section-title {
        font-size: 30px;
    }
}