/* =====================================================
   Global visual design system
   ===================================================== */

:root {
    color-scheme: dark;

    --page-bg: #080c12;
    --page-bg-secondary: #0d131c;
    --surface: rgba(17, 24, 33, 0.82);
    --surface-solid: #111821;
    --surface-hover: #151f2b;

    --text-primary: #e7edf3;
    --text-secondary: #b6c1cc;
    --text-muted: #8998a7;

    --accent: #4dd8e6;
    --accent-strong: #78e9f3;
    --accent-soft: rgba(77, 216, 230, 0.1);
    --accent-border: rgba(77, 216, 230, 0.24);

    --secondary-accent: #9b8cff;
    --border: rgba(182, 193, 204, 0.14);
    --shadow: 0 18px 50px rgba(0, 0, 0, 0.24);

    --heading-font: 'Space Grotesk', 'Noto Sans TC', sans-serif;
    --body-font: 'Manrope', 'Noto Sans TC', sans-serif;
}

.light-mode {
    color-scheme: light;

    --page-bg: #f5f7fa;
    --page-bg-secondary: #edf1f5;
    --surface: rgba(255, 255, 255, 0.82);
    --surface-solid: #ffffff;
    --surface-hover: #f7f9fb;

    --text-primary: #202936;
    --text-secondary: #4c5a68;
    --text-muted: #6f7d8a;

    --accent: #087f8c;
    --accent-strong: #056873;
    --accent-soft: rgba(8, 127, 140, 0.09);
    --accent-border: rgba(8, 127, 140, 0.22);

    --secondary-accent: #6957c8;
    --border: rgba(32, 41, 54, 0.12);
    --shadow: 0 18px 50px rgba(40, 55, 70, 0.1);
}

/* Base typography */
body,
body.light-mode {
    min-height: 100vh;
    color: var(--text-primary);
    background:
        radial-gradient(
            circle at 15% 10%,
            rgba(77, 216, 230, 0.07),
            transparent 32%
        ),
        radial-gradient(
            circle at 85% 25%,
            rgba(155, 140, 255, 0.06),
            transparent 28%
        ),
        linear-gradient(
            180deg,
            var(--page-bg),
            var(--page-bg-secondary)
        );
    font-family: var(--body-font);
    font-weight: 400;
    text-shadow: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    color: var(--text-primary);
    font-family: var(--heading-font);
    font-weight: 600;
    letter-spacing: -0.025em;
    text-shadow: none;
}

p,
li,
a,
button {
    font-family: var(--body-font);
}

p,
li {
    color: var(--text-secondary);
    line-height: 1.75;
    text-shadow: none;
}

a {
    color: var(--accent);
    text-shadow: none;
}

a:hover {
    color: var(--accent-strong);
}

/* General sections */
.section {
    border-bottom: 1px solid var(--border);
}

.section > h2 {
    margin-bottom: 14px;
    color: var(--text-primary);
    font-size: clamp(2rem, 4vw, 3rem);
    text-shadow: none;
}

.section > h2::after {
    display: block;
    width: 42px;
    height: 3px;
    margin: 14px auto 0;
    border-radius: 999px;
    background: linear-gradient(
        90deg,
        var(--accent),
        var(--secondary-accent)
    );
    content: "";
}

.section > p {
    color: var(--text-muted);
}


/* Shared cards */
.card,
.light-mode .card {
    overflow: hidden;
    padding: 0;
    border: 1px solid var(--border);
    border-radius: 18px;
    color: var(--text-primary);
    background: var(--surface);
    box-shadow: var(--shadow);
    text-shadow: none;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.card:hover {
    border-color: var(--accent-border);
    background: var(--surface-hover);
    box-shadow:
        var(--shadow),
        0 0 0 1px var(--accent-border);
    transform: translateY(-6px);
}

.card-img-top {
    width: 100%;
    aspect-ratio: 16 / 10;
    object-fit: cover;
}

.card-body {
    padding: 22px;
}

.card-title,
.light-mode .card-title {
    color: var(--text-primary);
    font-family: var(--heading-font);
    font-size: 1.08rem;
    line-height: 1.45;
    text-shadow: none;
}

.card-text,
.light-mode .card-text {
    color: var(--text-muted);
    line-height: 1.7;
    text-shadow: none;
}

/* Shared buttons */
.btn-custom,
.light-mode .btn-custom {
    border: 1px solid var(--accent-border);
    border-radius: 10px;
    color: var(--page-bg);
    background: var(--accent);
    box-shadow: none;
    font-weight: 700;
    text-shadow: none;
}

.btn-custom:hover,
.light-mode .btn-custom:hover {
    border-color: var(--accent);
    color: var(--page-bg);
    background: var(--accent-strong);
    box-shadow: 0 8px 24px rgba(77, 216, 230, 0.16);
}

/* Skills */
.skills-category {
    height: 100%;
    padding: 28px;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: var(--surface);
}

.skills-category h4 {
    margin-bottom: 18px;
    color: var(--text-primary);
    font-size: 1.05rem;
    text-shadow: none;
}

.skills-category ul li,
.light-mode .skills-category ul li {
    color: var(--text-secondary);
    font-weight: 500;
    text-shadow: none;
}

.skills-category ul li:hover,
.light-mode .skills-category ul li:hover {
    color: var(--accent);
    text-shadow: none;
    transform: none;
}

/* Footer */
footer,
.light-mode footer {
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    background: rgba(8, 12, 18, 0.65);
    box-shadow: none;
    text-shadow: none;
}

.light-mode footer {
    background: rgba(255, 255, 255, 0.56);
}

footer p {
    color: var(--text-muted);
    font-size: 0.82rem;
    font-weight: 500;
    text-shadow: none;
}

/* SimoneYC brand logo */
.brand-logo {
    width: 34px;
    height: 34px;
    flex: 0 0 auto;
    overflow: visible;
    filter: drop-shadow(0 0 8px rgba(77, 216, 230, 0.22));
}

.brand-logo-frame,
.brand-logo-y,
.brand-logo-c {
    fill: none;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.brand-logo-frame {
    stroke: var(--accent);
    stroke-width: 1.8;
}

.brand-logo-y {
    stroke: var(--accent-strong);
    stroke-width: 2.4;
}

.brand-logo-c {
    stroke: var(--text-primary);
    stroke-width: 2.4;
}

.nav-brand:hover .brand-logo {
    filter: drop-shadow(0 0 12px rgba(77, 216, 230, 0.46));
}

/* SimoneYC brand */
.nav-brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    transform: translateY(0);
    transition:
        color 0.25s ease,
        transform 0.25s ease,
        filter 0.25s ease;
}

.brand-logo {
    display: block;
    width: 42px;
    height: 42px;
    flex: 0 0 42px;
    border-radius: 10px;
    object-fit: contain;
    filter: drop-shadow(0 0 6px rgba(77, 216, 230, 0.14));
    transition: filter 0.25s ease;
}

.nav-brand > span {
    transition:
        color 0.25s ease,
        text-shadow 0.25s ease;
}

.nav-brand:hover {
    color: var(--text-primary);
    filter: none;
    transform: translateY(-3px);
}

.nav-brand:hover .brand-logo {
    filter: drop-shadow(0 5px 10px rgba(77, 216, 230, 0.32));
}

.nav-brand:hover > span {
    color: var(--accent-strong);
    text-shadow: 0 0 14px rgba(77, 216, 230, 0.24);
}

.nav-brand:active {
    transform: translateY(-1px) scale(0.98);
}

@media (max-width: 900px) {
    .brand-logo {
        width: 38px;
        height: 38px;
        flex-basis: 38px;
        border-radius: 9px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .nav-brand {
        transition: none;
    }

    .nav-brand:hover,
    .nav-brand:active {
        transform: none;
    }
}