:root {
    --bg: #f4f7fc;
    --card: #ffffff;
    --text: #142235;
    --muted: #6b7a90;
    --border: #dbe4f3;
    --primary: #003781;
    --primary2: #0a4aa6;
    --shadow: 0 18px 50px rgba(10,40,90,.12);
    --radius: 16px;
    --topbar-h: 64px;
}

* {
    box-sizing: border-box;
}

html, body {
    height: 100%;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Arial, "Noto Sans";
}

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

.app {
    min-height: 100%;
    display: flex;
    flex-direction: column;
}

/* TOPBAR */
.topbar {
    height: var(--topbar-h);
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,.88);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0,0,0,.06);
}

.topbar-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 16px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 160px;
}

.brand-logo {
    height: 28px;
    width: auto;
    display: block;
}

.nav {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
}

.nav-link {
    display: inline-flex;
    align-items: center;
    height: 38px;
    padding: 0 12px;
    border-radius: 12px;
    font-weight: 900;
    font-size: 13px;
    color: rgba(20,34,53,.85);
    border: 1px solid transparent;
}

    .nav-link:hover {
        background: rgba(0,55,129,.06);
        border-color: rgba(0,55,129,.12);
    }

    .nav-link.active {
        background: rgba(0,55,129,.12);
        border-color: rgba(0,55,129,.20);
        color: var(--primary);
    }

.topbar-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

.icon-btn {
    height: 38px;
    width: 38px;
    border-radius: 12px;
    border: 1px solid rgba(0,0,0,.10);
    background: #fff;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

    .icon-btn:hover {
        border-color: rgba(0,55,129,.25);
    }

.icon {
    font-size: 16px;
    line-height: 1;
}

.burger {
    display: none;
}

/* CONTENT */
.content {
    flex: 1;
}

/* FOOTER */
.footer {
    border-top: 1px solid rgba(0,0,0,.06);
    background: #fff;
}

.footer-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 12px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    color: var(--muted);
    font-size: 12px;
}

.footer a {
    color: var(--primary2);
    font-weight: 900;
}

    .footer a:hover {
        text-decoration: underline;
    }

.footer .dot {
    margin: 0 8px;
    opacity: .55;
}

/* MOBILE NAV */
@media (max-width: 860px) {
    .brand {
        min-width: auto;
    }

    .burger {
        display: inline-flex;
    }

    .nav {
        position: fixed;
        top: var(--topbar-h);
        left: 0;
        right: 0;
        background: rgba(255,255,255,.96);
        backdrop-filter: blur(10px);
        border-bottom: 1px solid rgba(0,0,0,.08);
        padding: 10px 12px;
        display: none;
        gap: 8px;
    }

        .nav.open {
            display: flex;
        }

    .nav-link {
        flex: 1;
        justify-content: center;
    }
}

/* DARK THEME (opsiyonel) */
body.dark {
    --bg: #0b1220;
    --card: #0f172a;
    --text: #e5eefc;
    --muted: #a1b3cf;
    --border: #21304d;
    background: var(--bg);
    color: var(--text);
}

    body.dark .topbar {
        background: rgba(15,23,42,.75);
        border-bottom: 1px solid rgba(255,255,255,.06);
    }

    body.dark .icon-btn {
        background: rgba(255,255,255,.05);
        border-color: rgba(255,255,255,.10);
    }

    body.dark .nav-link {
        color: rgba(229,238,252,.88);
    }

        body.dark .nav-link:hover {
            background: rgba(255,255,255,.06);
            border-color: rgba(255,255,255,.10);
        }

        body.dark .nav-link.active {
            background: rgba(255,255,255,.10);
            border-color: rgba(255,255,255,.16);
            color: #ffffff;
        }

    body.dark .footer {
        background: rgba(15,23,42,.75);
        border-top: 1px solid rgba(255,255,255,.06);
    }