:root {
    /* High-end Professional Dark Palette (Linear/Vercel inspired) */
    --bg-base: #000000;
    --bg-surface: #09090b;
    --bg-surface-hover: #18181b;
    --border-subtle: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(255, 255, 255, 0.15);
    
    --primary: #ffffff;
    --primary-invert: #000000;
    --accent: #3b82f6; /* Trust blue */
    
    --text-primary: #ffffff;
    --text-secondary: #a1a1aa;
    --text-tertiary: #52525b;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-base);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    overflow-x: hidden;
    line-height: 1.5;
}

/* --- Animated Spotlight Background --- */
.background-fx {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    z-index: -1;
    overflow: hidden;
    background: var(--bg-base);
    pointer-events: none;
}

.background-fx::before {
    content: '';
    position: absolute;
    width: 150vw; height: 150vh;
    top: -25vh; left: -25vw;
    background: radial-gradient(circle at 50% 50%, rgba(255,255,255,0.03) 0%, transparent 60%);
    animation: spotlightPan 20s ease-in-out infinite alternate;
}

@keyframes spotlightPan {
    0% { transform: translate(-5%, -5%); }
    100% { transform: translate(5%, 5%); }
}

.bg-brand-text {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    font-size: 18vw;
    font-weight: 900;
    color: transparent;
    -webkit-text-stroke: 1px rgba(255, 255, 255, 0.02);
    text-transform: uppercase;
    letter-spacing: 0.15em;
    white-space: nowrap;
    z-index: -1;
    user-select: none;
    animation: textBreathe 8s ease-in-out infinite alternate;
}

@keyframes textBreathe {
    0% { transform: translate(-50%, -50%) scale(1); opacity: 0.8; }
    100% { transform: translate(-50%, -50%) scale(1.02); opacity: 1; }
}

/* --- Layout Container --- */
.container {
    width: 100%;
    max-width: 500px;
    padding: 10vh 1.5rem 4rem;
    display: flex;
    flex-direction: column;
    gap: 3rem;
    position: relative;
    z-index: 1;
}

/* --- Typography & Animations --- */
.hero {
    text-align: center;
    animation: fadeSlideDown 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    opacity: 0;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 700;
    letter-spacing: -0.05em;
    margin-bottom: 1rem;
    background: linear-gradient(180deg, #FFFFFF 0%, #A1A1AA 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 80%;
    margin: 0 auto;
}

/* --- The Professional Card --- */
.pro-card {
    background: linear-gradient(180deg, rgba(24, 24, 27, 0.4) 0%, rgba(9, 9, 11, 0.4) 100%);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-subtle);
    border-radius: 16px;
    padding: 2.5rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.8);
    position: relative;
    overflow: hidden;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeSlideUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.2s forwards;
    transition: border-color 0.4s ease, box-shadow 0.4s ease, transform 0.4s ease;
}

.pro-card::before {
    content: '';
    position: absolute;
    top: 0; left: 10%; right: 10%;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    opacity: 0.5;
    transition: opacity 0.5s ease;
}

.pro-card:hover {
    border-color: var(--border-hover);
    box-shadow: 0 30px 60px -12px rgba(0, 0, 0, 0.9), 0 0 40px -10px rgba(255,255,255,0.03);
    transform: translateY(-5px);
}

.pro-card:hover::before {
    opacity: 1;
}

/* --- Input Field --- */
input[type="text"], input[type="url"], input[type="email"], input[type="password"] {
    width: 100%;
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    padding: 1.125rem 1.25rem;
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    outline: none;
    margin-bottom: 1.5rem;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.5);
}

input:focus {
    border-color: rgba(255, 255, 255, 0.3);
    background: rgba(0,0,0,0.8);
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.5), 0 0 0 3px rgba(255, 255, 255, 0.05);
}

input::placeholder { color: var(--text-tertiary); }

/* --- Beautiful Button --- */
.primary-btn {
    background: var(--primary);
    color: var(--primary-invert);
    border: none;
    border-radius: 12px;
    padding: 1.125rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-family: inherit;
    width: 100%;
    position: relative;
    overflow: hidden;
}

.primary-btn::after {
    content: '';
    position: absolute;
    top: 0; left: -100%; width: 50%; height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.8), transparent);
    transform: skewX(-20deg);
    transition: 0s;
}

.primary-btn:hover:not(:disabled) {
    transform: scale(1.02);
    box-shadow: 0 0 20px rgba(255,255,255,0.2);
}

.primary-btn:hover:not(:disabled)::after {
    left: 200%;
    transition: 0.6s ease-in-out;
}

.primary-btn:active:not(:disabled) { transform: scale(0.98); }

/* --- Keyframes --- */
@keyframes fadeSlideDown {
    0% { opacity: 0; transform: translateY(-20px); }
    100% { opacity: 1; transform: translateY(0); }
}

@keyframes fadeSlideUp {
    0% { opacity: 0; transform: translateY(20px); }
    100% { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .container { padding: 8vh 1rem 3rem; }
    .hero h1 { font-size: 2.25rem; }
    .pro-card { padding: 1.5rem; border-radius: 16px; }
    .bg-brand-text { font-size: 24vw; }
}