:root {
    /* Brand palette */
    --color-navy: #111C44;
    --color-blue: #2458E6;
    --color-turquoise: #18A6B8;
    --color-yellow: #F2A619;
    --color-surface: #F5F7FB;
    --color-white: #FFFFFF;

    /* Derived */
    --color-ink: #111C44;
    --color-muted: #4E5A75;
    --color-border: #E3E8F1;
    --color-border-strong: #C8D0E0;
    --color-danger: #B3261E;
    --color-success: #1E7D4F;
    --color-warning: #8A5A00;

    /* Typography — Mozilla Text (değişken, wght 200–700) her yerde. */
    --font-display: "Mozilla Text", system-ui, -apple-system, "Segoe UI", sans-serif;
    --font-body: "Mozilla Text", system-ui, -apple-system, "Segoe UI", sans-serif;
    --font-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Consolas, monospace;

    --text-xs: 0.72rem;
    --text-sm: 0.8125rem;
    --text-base: 0.9375rem;
    --text-lg: 1.125rem;
    --text-xl: 1.375rem;
    --text-2xl: 1.75rem;
    --text-3xl: 2.25rem;

    /* Spacing — kompakt ritim */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.75rem;
    --space-7: 2.5rem;
    --space-8: 3.5rem;

    /* Shape & elevation */
    --radius: 8px;
    --radius-sm: 4px;
    --radius-lg: 14px;
    --radius-xl: 18px;
    --shadow: 0 1px 2px rgba(17, 28, 68, 0.06), 0 2px 10px rgba(17, 28, 68, 0.05);
    --shadow-strong: 0 8px 28px rgba(17, 28, 68, 0.14);
    --shadow-lift: 0 2px 6px rgba(17, 28, 68, 0.08), 0 18px 40px -12px rgba(17, 28, 68, 0.22);
    --glow-blue: 0 6px 20px -4px rgba(36, 88, 230, 0.45);

    /* Interaction */
    --focus-ring: 0 0 0 3px rgba(36, 88, 230, 0.45);
    --outline-offset: 2px;

    /* Motion */
    --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
    --dur-fast: 0.16s;
    --dur-base: 0.24s;

    /* Layout */
    --container: 72rem;
    --header-height: 4.5rem;
}

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

html {
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: var(--font-body);
    font-size: var(--text-base);
    line-height: 1.55;
    color: var(--color-ink);
    background: var(--color-white);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

::selection {
    background: rgba(36, 88, 230, 0.16);
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-display);
    line-height: 1.16;
    font-weight: 620;
    letter-spacing: -0.02em;
    color: var(--color-navy);
    text-wrap: balance;
}

a {
    color: var(--color-blue);
}

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

:focus-visible {
    outline: 3px solid var(--color-blue);
    outline-offset: var(--outline-offset);
    border-radius: var(--radius-sm);
}

code,
kbd,
samp,
.mono,
.stat-value {
    font-family: var(--font-mono);
}

.skip-link {
    position: absolute;
    left: -9999px;
    top: 0;
    z-index: 100;
    background: var(--color-navy);
    color: var(--color-white);
    padding: var(--space-3) var(--space-4);
}

.skip-link:focus {
    left: 0;
    top: 0;
    color: var(--color-white);
}

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

.button-primary,
.button-secondary {
    display: inline-block;
    padding: 0.55rem 1.15rem;
    border-radius: var(--radius);
    font-size: var(--text-sm);
    font-weight: 550;
    letter-spacing: 0.01em;
    text-decoration: none;
    cursor: pointer;
    border: 1px solid transparent;
    transition: background-color var(--dur-fast) ease, border-color var(--dur-fast) ease, box-shadow var(--dur-base) var(--ease-out), transform var(--dur-base) var(--ease-out), color var(--dur-fast) ease;
}

.button-primary {
    background: linear-gradient(180deg, color-mix(in srgb, var(--color-blue) 92%, var(--color-white)), var(--color-blue));
    color: var(--color-white);
    box-shadow: 0 1px 2px rgba(17, 28, 68, 0.18);
}

.button-primary:hover {
    background: linear-gradient(180deg, color-mix(in srgb, var(--color-blue) 96%, var(--color-white)), var(--color-blue));
    color: var(--color-white);
    transform: translateY(-1px);
    box-shadow: var(--glow-blue);
}

.button-secondary {
    background: transparent;
    color: var(--color-navy);
    border-color: color-mix(in srgb, var(--color-navy) 45%, transparent);
}

.button-secondary:hover {
    background: var(--color-surface);
    border-color: var(--color-navy);
    color: var(--color-navy);
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}