/* ============================================================
   ROSI Landing — Design Tokens & Base
   ============================================================ */

:root {
    --bg-gradient: linear-gradient(196deg, #000915 21.08%, #0F294D 61.16%, #030B17 100%);
    --color-primary: #265aa6;
    --color-primary-hover: #3470c4;
    --color-accent: #4A9EFF;
    --color-accent-glow: rgba(74, 158, 255, 0.35);
    --color-text: #E6ECF5;
    --color-text-muted: #8FA3BD;
    --color-border: rgba(38, 90, 166, 0.25);
    --color-card-bg: rgba(15, 41, 77, 0.4);

    /* Trace pipeline state tokens */
    --color-trace-ok: #3FE0A2;
    --color-trace-ok-soft: rgba(63, 224, 162, 0.18);
    --color-trace-agent: #B8A4FF;
    --color-trace-agent-soft: rgba(140, 100, 255, 0.12);

    --font-display: 'Sora', system-ui, sans-serif;
    --font-body: 'Inter', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', ui-monospace, monospace;

    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --radius-xl: 28px;

    --shadow-card: 0 6px 30px rgba(0, 0, 0, 0.35);
    --shadow-accent: 0 0 0 1px var(--color-accent), 0 0 24px var(--color-accent-glow);

    --container-max: 1240px;
    --section-padding-y: 7rem;
    --nav-height: 72px;
    --footer-height: 56px;

    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --transition-fast: 150ms ease-out;
    --transition-base: 200ms ease-out;
    --transition-slow: 400ms var(--ease-out);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    background: var(--bg-gradient);
    background-attachment: fixed;
    color: var(--color-text);
    font-family: var(--font-body);
    font-size: 17px;
    line-height: 1.6;
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    min-height: 100vh;
    overflow-x: hidden;
}

/* ============================================================
   Typografie
   ============================================================ */

h1, h2, h3, h4 {
    font-family: var(--font-display);
    font-weight: 600;
    letter-spacing: -0.02em;
    line-height: 1.15;
    margin: 0 0 0.6em;
    color: var(--color-text);
}

h1 { font-size: clamp(2.4rem, 5vw + 1rem, 4rem); }
h2 { font-size: clamp(1.9rem, 3vw + 0.8rem, 2.75rem); }
h3 { font-size: clamp(1.25rem, 1.2vw + 0.9rem, 1.75rem); }
h4 { font-size: 1.125rem; }

p {
    margin: 0 0 1rem;
    color: var(--color-text-muted);
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition-base);
}

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

a:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 3px;
    border-radius: var(--radius-sm);
}

code, pre, .mono {
    font-family: var(--font-mono);
    font-size: 0.9em;
}

small, .small {
    font-size: 14px;
    color: var(--color-text-muted);
}

::selection {
    background: var(--color-accent);
    color: #00111f;
}

/* ============================================================
   Layout-Helpers
   ============================================================ */

.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 clamp(1rem, 4vw, 2rem);
}

main {
    display: block;
    padding-top: var(--nav-height);
    padding-bottom: var(--footer-height);
}

section {
    padding: var(--section-padding-y) 0;
    position: relative;
}

.section-eyebrow {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: var(--color-accent);
    background: rgba(74, 158, 255, 0.08);
    padding: 0.4rem 0.9rem;
    border-radius: 999px;
    border: 1px solid rgba(74, 158, 255, 0.25);
    margin-bottom: 1.2rem;
}

/* ============================================================
   Buttons
   ============================================================ */

.btn {
    --btn-bg: var(--color-primary);
    --btn-bg-hover: var(--color-primary-hover);
    --btn-color: #ffffff;
    --btn-border: transparent;

    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.95rem 1.6rem;
    font-family: var(--font-body);
    font-size: 0.98rem;
    font-weight: 500;
    line-height: 1;
    color: var(--btn-color);
    background: var(--btn-bg);
    border: 1px solid var(--btn-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background var(--transition-base),
                transform var(--transition-base),
                box-shadow var(--transition-base),
                color var(--transition-base),
                border-color var(--transition-base);
    text-decoration: none;
    white-space: nowrap;
}

.btn:hover {
    background: var(--btn-bg-hover);
    transform: translateY(-1px);
    box-shadow: 0 8px 28px rgba(74, 158, 255, 0.25);
    color: var(--btn-color);
}

.btn:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

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

.btn--secondary {
    --btn-bg: transparent;
    --btn-bg-hover: rgba(74, 158, 255, 0.1);
    --btn-color: var(--color-text);
    --btn-border: rgba(74, 158, 255, 0.4);
}

.btn--secondary:hover {
    --btn-color: var(--color-text);
    border-color: var(--color-accent);
}

.btn--ghost {
    --btn-bg: transparent;
    --btn-bg-hover: rgba(74, 158, 255, 0.08);
    --btn-color: var(--color-text-muted);
    padding: 0.6rem 1rem;
}

/* ============================================================
   Cards (Base)
   ============================================================ */

.card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    transition: border-color var(--transition-base),
                transform var(--transition-base),
                box-shadow var(--transition-base);
}

/* ============================================================
   Reduced Motion
   ============================================================ */

@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;
    }
}

/* ============================================================
   Form Validation (Blazor Default)
   ============================================================ */

.validation-message {
    color: #ff8a8a;
    font-size: 0.85rem;
    margin-top: 0.35rem;
    display: block;
}

.invalid {
    border-color: rgba(255, 138, 138, 0.6) !important;
    box-shadow: 0 0 0 3px rgba(255, 138, 138, 0.15);
}

/* Visually-hidden helper for SR-only labels */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Skip Link */
.skip-link {
    position: absolute;
    top: -100px;
    left: 1rem;
    background: var(--color-primary);
    color: #fff;
    padding: 0.6rem 1rem;
    border-radius: var(--radius-sm);
    z-index: 1000;
    transition: top var(--transition-base);
}

.skip-link:focus {
    top: 1rem;
    color: #fff;
}

/* ============================================================
   Scroll-Pfeil — springt per Klick zur nächsten Sektion
   (Logik: js/scroll-arrow.js). Mittig unten, schwebend.
   ============================================================ */

.scroll-arrow {
    position: fixed;
    left: 50%;
    bottom: 4rem;
    transform: translateX(-50%);
    z-index: 60;
    width: 46px;
    height: 46px;
    display: grid;
    place-items: center;
    padding: 0;
    color: var(--color-text);
    background: rgba(8, 18, 36, 0.6);
    border: 1px solid rgba(74, 158, 255, 0.35);
    border-radius: 50%;
    box-shadow: 0 8px 24px rgba(2, 9, 22, 0.45);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    cursor: pointer;
    animation: scroll-arrow-bounce 2s ease-in-out infinite;
    transition: opacity 0.3s var(--ease-out), transform 0.3s var(--ease-out),
                border-color 0.2s var(--ease-out), background 0.2s var(--ease-out),
                color 0.2s var(--ease-out);
}

.scroll-arrow svg {
    width: 22px;
    height: 22px;
}

.scroll-arrow:hover {
    border-color: var(--color-accent);
    background: rgba(15, 41, 77, 0.72);
    color: var(--color-accent);
}

.scroll-arrow:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 3px;
}

/* Versteckt: am Seitenende, keine nächste Sektion oder Cookie-Banner offen */
.scroll-arrow.is-hidden {
    opacity: 0;
    pointer-events: none;
    animation: none;
    transform: translateX(-50%) translateY(14px);
}