/* =========================================================
   Ensa Bilgisayar — Design Tokens & Base
   ========================================================= */

:root {
    --color-primary: #e51b16;
    --color-primary-hover: #c91612;
    --color-primary-soft: rgba(229, 27, 22, 0.1);
    --color-dark: #0b0b0b;
    --color-dark-soft: #161616;
    --color-dark-elevated: #1c1c1c;
    --color-white: #ffffff;
    --color-bg: #ffffff;
    --color-bg-muted: #f5f5f5;
    --color-bg-subtle: #fafafa;
    --color-border: #e8e8e8;
    --color-border-strong: #d6d6d6;
    --color-text: #1a1a1a;
    --color-text-muted: #6b6b6b;
    --color-text-soft: #8a8a8a;
    --color-text-on-dark: #ffffff;
    --color-text-on-dark-muted: rgba(255, 255, 255, 0.72);

    --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;

    --container: 1180px;
    --header-topbar: 40px;
    --header-nav: 76px;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --shadow-sm: 0 4px 16px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 12px 40px rgba(0, 0, 0, 0.1);
    --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.18);
    --transition: 180ms ease;
    --focus-ring: 0 0 0 3px rgba(229, 27, 22, 0.35);
}

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

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

body {
    margin: 0;
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
}

body.is-menu-open {
    overflow: hidden;
}

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

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

ul {
    margin: 0;
    padding: 0;
    list-style: none;
}

button,
input,
select,
textarea {
    font: inherit;
    color: inherit;
}

button {
    cursor: pointer;
    border: 0;
    background: none;
}

h1, h2, h3, h4, p {
    margin: 0;
}

:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

.skip-link {
    position: absolute;
    left: 16px;
    top: -60px;
    z-index: 10000;
    padding: 10px 14px;
    background: var(--color-primary);
    color: var(--color-white);
    border-radius: var(--radius-sm);
    transition: top var(--transition);
}

.skip-link:focus {
    top: 12px;
}

.container {
    width: min(100% - 40px, var(--container));
    margin-inline: auto;
}

.section {
    padding: 96px 0;
}

.section__header {
    max-width: 640px;
    margin-bottom: 48px;
}

.section__header--light .section__title,
.section__header--light .section__lead {
    color: var(--color-text-on-dark);
}

.section__header--light .section__lead {
    color: var(--color-text-on-dark-muted);
}

.section__eyebrow {
    margin-bottom: 12px;
    color: var(--color-primary);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.section__title {
    margin-bottom: 14px;
    font-size: clamp(1.75rem, 2.4vw, 2.35rem);
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -0.02em;
    color: var(--color-dark);
}

.section__lead {
    color: var(--color-text-muted);
    font-size: 1.05rem;
}

.icon {
    flex-shrink: 0;
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    margin-bottom: 14px;
    border-radius: 999px;
    background: var(--color-primary);
    color: var(--color-white);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 48px;
    padding: 0 22px;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    font-size: 0.875rem;
    font-weight: 700;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    transition: background-color var(--transition), color var(--transition), border-color var(--transition), transform var(--transition), box-shadow var(--transition), opacity var(--transition);
    white-space: nowrap;
}

.btn:hover {
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0);
}

.btn--primary {
    background: var(--color-primary);
    color: var(--color-white);
}

.btn--primary:hover {
    background: var(--color-primary-hover);
}

.btn--primary:disabled,
.btn--primary[disabled] {
    background: #f0b0ad;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn--ghost {
    background: transparent;
    color: var(--color-white);
    border-color: rgba(255, 255, 255, 0.45);
}

.btn--ghost:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--color-white);
}

.btn--outline {
    background: transparent;
    color: var(--color-dark);
    border-color: var(--color-border-strong);
}

.btn--outline:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.btn--sm {
    min-height: 44px;
    padding: 0 16px;
    font-size: 0.8rem;
}

.btn--block {
    width: 100%;
}

/* Reveal animation helper */
.reveal {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.reveal.is-visible {
    opacity: 1;
    transform: none;
}