:root {
    --bg-grad-1: #0f172a;
    --bg-grad-2: #1e1b4b;
    --surface: rgba(255, 255, 255, 0.05);
    --surface-border: rgba(255, 255, 255, 0.1);
    --primary: #818cf8;
    --primary-hover: #6366f1;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --error: #ef4444;
    --success: #22c55e;
    --accent-glow: rgba(129, 140, 248, 0.15);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Inter', sans-serif;
    background: linear-gradient(135deg, var(--bg-grad-1), var(--bg-grad-2));
    color: var(--text-main);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    overflow: hidden;
    position: relative;
}

.login-container {
    background: var(--surface);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--surface-border);
    border-radius: 24px;
    padding: 3rem;
    width: 100%;
    max-width: 420px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.8s ease-out;
    position: relative;
    z-index: 1;
}

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

/* ===== Language Switcher ===== */
.lang-switcher {
    position: fixed;
    top: 1.5rem;
    left: 1.5rem;
    z-index: 100;
    display: flex;
    align-items: center;
    gap: 0.25rem;
    background: rgba(255, 255, 255, 0.06);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--surface-border);
    border-radius: 10px;
    padding: 0.35rem 0.6rem;
    animation: fadeIn 0.8s ease-out 0.2s both;
}

.lang-btn {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.8rem;
    font-weight: 600;
    padding: 0.3rem 0.5rem;
    border-radius: 6px;
    transition: all 0.2s ease;
    letter-spacing: 0.03em;
    text-transform: uppercase;
}

.lang-btn:hover {
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.08);
}

.lang-btn.active {
    color: var(--primary);
    background: rgba(129, 140, 248, 0.15);
}

.lang-separator {
    color: rgba(255, 255, 255, 0.2);
    font-size: 0.75rem;
}

/* ===== Logo ===== */
.logo-wrapper {
    margin-bottom: 1rem;
    display: flex;
    justify-content: center;
}

.logo {
    max-width: 80px;
    max-height: 80px;
    object-fit: contain;
    filter: drop-shadow(0 0 20px rgba(129, 140, 248, 0.3));
    transition: transform 0.3s ease, filter 0.3s ease;
    border-radius: 16px;
}

.logo:hover {
    transform: scale(1.05);
    filter: drop-shadow(0 0 30px rgba(129, 140, 248, 0.5));
}

/* ===== Header ===== */
.header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.header h1 {
    margin: 0;
    font-size: 2rem;
    font-weight: 600;
    background: linear-gradient(to right, #a5b4fc, #818cf8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.header p {
    color: var(--text-muted);
    margin-top: 0.5rem;
    font-size: 0.95rem;
}

/* ===== Form ===== */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    background: rgba(0, 0, 0, 0.25);
    border: 1px solid var(--surface-border);
    border-radius: 12px;
    color: var(--text-main);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-control::placeholder {
    color: rgba(148, 163, 184, 0.5);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(129, 140, 248, 0.2);
}

/* ===== Terms & Conditions ===== */
.terms-group {
    margin: 1.5rem 0 0.5rem;
    padding: 0.75rem 1rem;
    background: rgba(0, 0, 0, 0.15);
    border-radius: 10px;
    border: 1px solid var(--surface-border);
    transition: all 0.3s ease;
}

.terms-group:hover {
    border-color: rgba(129, 140, 248, 0.3);
    background: rgba(0, 0, 0, 0.2);
}

.terms-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-muted);
    cursor: pointer;
    flex-wrap: wrap;
}

.terms-checkbox {
    width: 18px;
    height: 18px;
    accent-color: var(--primary);
    cursor: pointer;
    flex-shrink: 0;
    margin: 0;
}

.terms-link {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.2s ease;
    border-bottom: 1px solid transparent;
}

.terms-link:hover {
    color: var(--primary-hover);
    border-bottom-color: var(--primary-hover);
}

/* ===== Buttons ===== */
.btn-submit {
    width: 100%;
    padding: 0.875rem;
    background: linear-gradient(135deg, var(--primary), var(--primary-hover));
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 1.25rem;
    letter-spacing: 0.02em;
}

.btn-submit:hover {
    background: linear-gradient(135deg, var(--primary-hover), #4f46e5);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.3);
}

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

/* ===== Alerts ===== */
.alert {
    padding: 1rem;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    color: var(--error);
    font-size: 0.9rem;
    text-align: center;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateY(-8px); }
    to   { opacity: 1; transform: translateY(0); }
}

.alert-success {
    background: rgba(34, 197, 94, 0.1);
    border-color: rgba(34, 197, 94, 0.2);
    color: var(--success);
}

/* ===== Decorative circles ===== */
.circle {
    position: fixed;
    border-radius: 50%;
    filter: blur(80px);
    z-index: 0;
    pointer-events: none;
}

.circle-1 {
    width: 300px;
    height: 300px;
    background: rgba(129, 140, 248, 0.15);
    top: -100px;
    left: -100px;
}

.circle-2 {
    width: 400px;
    height: 400px;
    background: rgba(192, 132, 252, 0.1);
    bottom: -150px;
    right: -150px;
}