:root {
    --font: 'IBM Plex Mono', ui-monospace, monospace;
    --gradient-start: #E90DCA;
    --gradient-end: #1536F1;
    /* Light theme */
    --bg: #fafbfc;
    --bg-gradient: linear-gradient(135deg, #fafbfc 0%, #f0f4ff 100%);
    --surface: rgba(255, 255, 255, 0.8);
    --surface-hover: rgba(255, 255, 255, 0.95);
    --text: #1a1d21;
    --text-secondary: #6b7280;
    --border: rgba(229, 231, 235, 0.6);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --accent-shadow: 0 0 20px rgba(233, 13, 202, 0.15);
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0f111a;
        --bg-gradient: linear-gradient(135deg, #0f111a 0%, #1a1d29 100%);
        --surface: rgba(26, 29, 41, 0.8);
        --surface-hover: rgba(26, 29, 41, 0.95);
        --text: #f8fafc;
        --text-secondary: #94a3b8;
        --border: rgba(51, 65, 85, 0.6);
        --accent-shadow: 0 0 20px rgba(21, 54, 241, 0.2);
    }
}

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

html, body {
    height: 100%;
    font-family: var(--font);
    background: var(--bg-gradient);
    color: var(--text);
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

.page-container {
    min-height: 100vh;
    display: grid;
    grid-template-rows: auto 1fr auto;
    position: relative;
}

    .page-container::before {
        content: '';
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: radial-gradient(circle at 20% 20%, rgba(233, 13, 202, 0.1) 0%, transparent 50%), radial-gradient(circle at 80% 80%, rgba(21, 54, 241, 0.1) 0%, transparent 50%);
        pointer-events: none;
        z-index: 0;
    }

/* Header */
.header {
    position: relative;
    z-index: 10;
    padding: 1.5rem 0;
    background: var(--surface);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo {
    height: 64px;
    width: auto;
    object-fit: contain;
    border-radius: 12px;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.1));
    transition: transform 0.3s ease, filter 0.3s ease;
}

    .logo:hover {
        transform: scale(1.05);
        filter: drop-shadow(0 8px 16px rgba(0, 0, 0, 0.15));
    }

/* Main */
.main {
    position: relative;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 3rem 2rem;
}

.login-container {
    width: 100%;
    max-width: 480px;
}

.login-form {
    background: var(--surface);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 3rem 2.5rem;
    box-shadow: var(--shadow-lg), var(--accent-shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    overflow: hidden;
}

    .login-form::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        height: 4px;
        background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
        border-radius: 24px 24px 0 0;
    }

    .login-form:hover {
        transform: translateY(-4px);
        box-shadow: 0 32px 64px -12px rgba(0, 0, 0, 0.15), 0 0 32px rgba(233, 13, 202, 0.1);
    }

.form-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

    .form-header h1 {
        font-size: 2.25rem;
        font-weight: 700;
        background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
        -webkit-background-clip: text;
        background-clip: text;
        -webkit-text-fill-color: transparent;
        margin-bottom: 0.75rem;
        letter-spacing: -0.025em;
    }

    .form-header p {
        color: var(--text-secondary);
        font-size: 1rem;
        font-weight: 500;
    }

.form-body {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

    .input-group label {
        font-weight: 600;
        font-size: 0.875rem;
        color: var(--text);
        margin-left: 0.25rem;
    }

.form-input {
    width: 100%;
    padding: 1rem 1.25rem;
    border: 2px solid var(--border);
    border-radius: 12px;
    background: var(--surface-hover);
    color: var(--text);
    font-family: var(--font);
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

    .form-input:focus {
        outline: none;
        border-color: var(--gradient-end);
        box-shadow: 0 0 0 4px rgba(21, 54, 241, 0.1), 0 4px 12px rgba(21, 54, 241, 0.15);
        transform: translateY(-2px);
    }

    .form-input::placeholder {
        color: var(--text-secondary);
        opacity: 0.8;
    }

.login-btn {
    width: 100%;
    padding: 1.125rem 1.5rem;
    border: none;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white;
    font-family: var(--font);
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow), 0 0 20px rgba(233, 13, 202, 0.3);
    position: relative;
    overflow: hidden;
}

    .login-btn::before {
        content: '';
        position: absolute;
        top: 0;
        left: -100%;
        width: 100%;
        height: 100%;
        background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
        transition: left 0.5s;
    }

    .login-btn:hover::before {
        left: 100%;
    }

    .login-btn:hover {
        transform: translateY(-3px);
        box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.2), 0 0 30px rgba(233, 13, 202, 0.4);
    }

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

.error-message {
    padding: 1rem 1.25rem;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: 12px;
    color: #dc2626;
    font-size: 0.875rem;
    font-weight: 500;
    text-align: center;
    backdrop-filter: blur(10px);
}

/* Footer */
.footer {
    position: relative;
    z-index: 10;
    background: var(--surface);
    backdrop-filter: blur(20px);
    border-top: 1px solid var(--border);
    padding: 1.25rem 0;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.author-link {
    font-weight: 700;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    text-decoration: none;
    transition: all 0.3s ease;
    position: relative;
}

    .author-link::after {
        content: '';
        position: absolute;
        bottom: -2px;
        left: 0;
        width: 0;
        height: 2px;
        background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
        transition: width 0.3s ease;
    }

    .author-link:hover::after {
        width: 100%;
    }

/* Responsive */
@media (max-width: 640px) {
    .header {
        padding: 1rem 0;
    }

    .header-content {
        padding: 0 1.5rem;
    }

    .logo {
        height: 48px;
    }

    .main {
        padding: 2rem 1.5rem;
    }

    .login-form {
        padding: 2rem 1.5rem;
        border-radius: 20px;
    }

    .form-header h1 {
        font-size: 1.875rem;
    }

    .footer-content {
        flex-direction: column;
        gap: 0.75rem;
        text-align: center;
        padding: 0 1.5rem;
    }
}

@media (max-width: 480px) {
    .form-body {
        gap: 1.5rem;
    }

    .form-input {
        padding: 0.875rem 1rem;
        font-size: 0.875rem;
    }

    .login-btn {
        padding: 1rem 1.25rem;
        font-size: 0.875rem;
    }
}