*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --accent:      #4f6ef7;
    --accent-dark: #3a55d4;
    --bg:          #0f1117;
    --bg2:         #181c27;
    --bg3:         #1f2435;
    --border:      #2a2f42;
    --text:        #e8eaf0;
    --muted:       #6b7280;
    --nav-bg:      rgba(15,17,23,0.85);
    --grad:        linear-gradient(to left, #0b984a, #1c3f7e);
}

[data-theme="light"] {
    --bg:     #f0f2f8;
    --bg2:    #ffffff;
    --bg3:    #e4e8f4;
    --border: #ced3e8;
    --text:   #1a1d2e;
    --muted:  #575e7a;
    --nav-bg: rgba(240,242,248,0.9);
}

html { scroll-behavior: smooth; }

body {
    background: var(--bg);
    color: var(--text);
    font-family: system-ui, -apple-system, sans-serif;
    line-height: 1.65;
    transition: background 0.2s, color 0.2s;
}

.container {
    max-width: 860px;
    margin: 0 auto;
    padding: 0 1.25rem;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
[data-theme="dark"] a { color: #7c9bff; }

/* ── Theme toggle ─────────────────────────────── */
.theme-toggle {
    background: none;
    border: 1px solid var(--border);
    border-radius: 999px;
    color: var(--muted);
    cursor: pointer;
    font-size: 0.85rem;
    padding: 0.25rem 0.55rem;
    line-height: 1.4;
    transition: border-color 0.15s, color 0.15s;
    flex-shrink: 0;
}
.theme-toggle:hover { border-color: var(--accent); color: var(--text); }

/* ── Nav ─────────────────────────────────────── */
nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--nav-bg);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    padding: 0.75rem 1.25rem;
    transition: background 0.2s, border-color 0.2s;
}
.nav-inner {
    max-width: 860px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}
.nav-name {
    font-weight: 700;
    font-size: 1rem;
    letter-spacing: -0.01em;
    color: var(--text);
    text-decoration: none;
}
.nav-name span {
    background: var(--grad);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.nav-right { display: flex; align-items: center; gap: 1rem; }

/* ── Footer ──────────────────────────────────── */
footer {
    border-top: 1px solid var(--border);
    padding: 2rem 1.25rem;
    text-align: center;
    font-size: 0.8rem;
    color: var(--muted);
}
footer a { color: var(--muted); }
footer a:hover { color: var(--text); }