:root {
    --color-bg: #000;
    --color-text: #f5f5f7;
    --color-text-tertiary: rgba(255, 255, 255, 0.45);
    --color-blue: #2997ff;
    --color-blue-hover: #0077ed;
    --color-border: rgba(255, 255, 255, 0.10);
    --color-border-strong: rgba(255, 255, 255, 0.14);
    --color-border-light: rgba(255, 255, 255, 0.06);
    --color-surface-hover: rgba(255, 255, 255, 0.08);
    --font-family: -apple-system, "SF Pro Display", "Helvetica Neue", sans-serif;
    --radius-sm: 12px;
    --radius-xl: 24px;
    --radius-full: 999px;
    --transition-normal: 0.2s ease;
    --nav-height: 48px;
}

*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: radial-gradient(ellipse at top, #1a1a2e 0%, #000 60%);
    padding: calc(var(--nav-height) + 40px) 20px 40px;
    font-family: var(--font-family);
    color: var(--color-text);
    -webkit-font-smoothing: antialiased;
}

nav {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    height: var(--nav-height);
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.72);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--color-border-light);
}

nav ul {
    list-style: none;
    display: flex;
    align-items: center;
    gap: 28px;
}

nav ul li a {
    text-decoration: none;
    font-size: 13px;
    color: var(--color-text);
    opacity: 0.82;
    transition: color var(--transition-normal);
}

nav ul li a:hover {
    opacity: 1;
    color: white;
}

body h1 {
    font-size: 42px;
    font-weight: 700;
    letter-spacing: -0.04em;
    margin-bottom: 30px;
    color: #fff;
    text-align: center;
}

body form {
    width: min(420px, 92%);
    background: rgba(255, 255, 255, 0.04);
    border: 0.5px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: 32px;
    backdrop-filter: blur(10px);
    display: flex;
    flex-direction: column;
    gap: 14px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

body form label {
    font-size: 11px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-text-tertiary);
}

body form input[type="text"],
body form input[type="password"],
body form input[type="email"] {
    width: 100%;
    padding: 12px 14px;
    border-radius: var(--radius-sm);
    border: 0.5px solid var(--color-border);
    background: rgba(0, 0, 0, 0.3);
    color: #fff;
    font-size: 15px;
    font-family: var(--font-family);
    outline: none;
    transition: all var(--transition-normal);
}

body form input:focus {
    border-color: rgba(41, 151, 255, 0.6);
    background: rgba(0, 0, 0, 0.5);
}

body form input[type="submit"] {
    margin-top: 10px;
    padding: 12px 22px;
    border-radius: var(--radius-full);
    border: none;
    background: var(--color-blue);
    color: white;
    font-size: 15px;
    font-weight: 500;
    font-family: var(--font-family);
    cursor: pointer;
    transition: all var(--transition-normal);
}

body form input[type="submit"]:hover {
    background: var(--color-blue-hover);
    transform: translateY(-1px);
}

.google-login-btn {
    display: block;
    text-align: center;
    margin-top: 5px;
    padding: 12px 22px;
    border-radius: var(--radius-full);
    border: 1px solid var(--color-border-strong);
    background: var(--color-surface-hover);
    color: white;
    text-decoration: none;
    font-size: 15px;
    font-family: var(--font-family);
    transition: all var(--transition-normal);
}

.google-login-btn:hover {
    background: rgba(255, 255, 255, 0.14);
}


body form br {
    display: none;
}


/* Toast notifications */
.toast-container {
    position: fixed;
    top: 60px;
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast {
    padding: 14px 20px;
    border-radius: 14px;
    font-size: 14px;
    font-family: var(--font-family);
    color: white;
    min-width: 280px;
    max-width: 420px;
    animation: toastSlide 0.3s ease;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
    cursor: pointer;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.toast:hover {
    opacity: 0.85;
    transform: translateX(-4px);
}

.toast-success {
    background: rgba(52, 199, 89, 0.9);
    border: 1px solid rgba(52, 199, 89, 0.5);
}

.toast-error {
    background: rgba(255, 94, 122, 0.9);
    border: 1px solid rgba(255, 94, 122, 0.5);
}

.toast-info {
    background: rgba(41, 151, 255, 0.9);
    border: 1px solid rgba(41, 151, 255, 0.5);
}

@keyframes toastSlide {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

@media (max-width: 768px) {
    body {
        padding: calc(var(--nav-height) + 20px) 16px 20px;
    }
}