*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
    margin: 0;
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--gray-900);
    background: var(--white);
    -webkit-font-smoothing: antialiased;
    padding-bottom: env(safe-area-inset-bottom);
}

input, select, textarea, button { font-family: inherit; font-size: 16px; }

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

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* === HEADER === */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--nav-height);
    padding: 0 var(--s-4);
    background: rgba(255,255,255,.85);
    backdrop-filter: saturate(180%) blur(12px);
    -webkit-backdrop-filter: saturate(180%) blur(12px);
    border-bottom: 1px solid var(--gray-100);
}

.logo {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 1.15rem;
    color: var(--dark);
    letter-spacing: -.5px;
}
.logo:hover { text-decoration: none; }

/* === PRZYCISKI === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--s-2);
    min-height: 44px;
    padding: 0 var(--s-5);
    border: 2px solid transparent;
    border-radius: var(--r);
    font-weight: 600;
    font-size: .95rem;
    text-decoration: none;
    cursor: pointer;
    transition: var(--t);
    white-space: nowrap;
    -webkit-tap-highlight-color: transparent;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white !important;
    box-shadow: 0 4px 14px rgba(37,117,252,.3);
}
.btn-primary:active { transform: scale(.98); }

.btn-outline {
    border-color: var(--gray-300);
    color: var(--gray-700);
    background: transparent;
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }

.btn-ghost {
    background: transparent;
    color: var(--gray-700);
}
.btn-ghost:hover { background: var(--gray-100); text-decoration: none; }

.btn-lg { min-height: 56px; padding: 0 var(--s-6); font-size: 1.05rem; border-radius: var(--r-lg); }
.btn-block { width: 100%; }

/* === HERO === */
.hero {
    padding: var(--s-7) var(--s-4);
    text-align: center;
    max-width: var(--max-width);
    margin: 0 auto;
}
.hero h1 {
    font-family: var(--font-display);
    font-size: clamp(2rem, 8vw, 4rem);
    font-weight: 900;
    line-height: 1.05;
    letter-spacing: -1.5px;
    color: var(--dark);
    margin: 0 0 var(--s-5);
}
.gradient {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero p {
    font-size: 1.1rem;
    color: var(--gray-500);
    max-width: 520px;
    margin: 0 auto var(--s-6);
}

/* === FORMULARZE === */
.field { display: block; margin-bottom: var(--s-4); }
.field label {
    display: block;
    font-size: .85rem;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: var(--s-2);
}
.field input,
.field select {
    width: 100%;
    min-height: 48px;
    padding: 0 var(--s-4);
    border: 1.5px solid var(--gray-300);
    border-radius: var(--r);
    background: var(--white);
    transition: var(--t);
}
.field input:focus,
.field select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px var(--primary-light);
}

/* === KARTY / AUTH === */
.auth-wrap {
    min-height: calc(100vh - var(--nav-height));
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--s-5) var(--s-4);
}
.auth-card {
    width: 100%;
    max-width: 420px;
    background: var(--white);
    border: 1px solid var(--gray-100);
    border-radius: var(--r-lg);
    padding: var(--s-6);
    box-shadow: var(--shadow);
}
.auth-card h1 {
    font-family: var(--font-display);
    font-size: 1.6rem;
    font-weight: 800;
    margin: 0 0 var(--s-2);
    color: var(--dark);
}
.auth-card .sub {
    color: var(--gray-500);
    font-size: .95rem;
    margin: 0 0 var(--s-5);
}
.auth-footer {
    text-align: center;
    margin-top: var(--s-5);
    font-size: .9rem;
    color: var(--gray-500);
}

/* === ALERTY === */
.alert {
    padding: var(--s-3) var(--s-4);
    border-radius: var(--r);
    font-size: .9rem;
    margin-bottom: var(--s-4);
}
.alert-danger { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; }
.alert-success { background: #ecfdf5; color: #065f46; border: 1px solid #a7f3d0; }
.alert-info { background: var(--primary-light); color: var(--primary-dark); }

/* === CONTAINER === */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--s-4);
}