/* ---------- متغیرهای رنگ ---------- */
:root {
    --bg-gradient: linear-gradient(145deg, #f9f5ff 0%, #ede7f6 100%);
    --header-bg: rgba(255, 255, 255, 0.4);
    --card-bg: rgba(255, 255, 255, 0.85);
    --text-primary: #2d2a3e;
    --text-secondary: #5a4e7a;
    --border-light: rgba(108, 92, 231, 0.2);
    --shadow: 0 8px 20px rgba(0, 0, 0, 0.04);
    --btn-gradient: linear-gradient(90deg, #6c5ce7, #a463f5);
}

/* ---------- ریست و فونت پایه ---------- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: 'Inter', system-ui, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    line-height: 1.5;
    margin: 0;
}

/* ---------- استایل صفحه ثبت‌نام ---------- */
.auth-page {
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.auth-container {
    max-width: 500px;
    width: 100%;
    margin: 0 auto;
    animation: fadeInUp 0.5s ease-out;
    padding: 0 1rem;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translate3d(0, 20px, 0);
    }
    to {
        opacity: 1;
        transform: translate3d(0, 0, 0);
    }
}

.auth-card {
    background: rgba(255, 255, 255, 0.96);
    border-radius: 2rem;
    padding: 2rem;
    box-shadow: 0 20px 35px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s, box-shadow 0.2s;
}

.auth-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 25px 40px rgba(0, 0, 0, 0.15);
}

.text-center {
    text-align: center;
}

.register-icon {
    margin-bottom: 0.5rem;
}

.auth-card h2 {
    font-size: clamp(1.8rem, 6vw, 2.2rem);
    font-weight: 700;
    background: linear-gradient(120deg, #667eea, #764ba2);
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
    margin-bottom: 1.2rem;
}

.input-group {
    position: relative;
    margin-bottom: 1.5rem;
    text-align: right;
}

.input-group svg {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: #aaa;
    transition: 0.2s;
    width: 1.2rem;
    height: 1.2rem;
    pointer-events: none;
}

.input-group input:focus + svg {
    color: #667eea;
}

.input-group input {
    width: 100%;
    padding: 0.9rem 2.5rem;
    border-radius: 1.5rem;
    border: 1px solid rgba(108, 92, 231, 0.3);
    background: rgba(255, 255, 255, 0.95);
    font-size: 1rem;
    transition: border 0.2s, box-shadow 0.2s;
    font-family: inherit;
    outline: none;
}

.input-group input:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.2);
    background: white;
}

.error-msg {
    color: #e74c3c;
    font-size: 0.75rem;
    margin-top: 0.3rem;
    text-align: right;
    padding-right: 0.5rem;
}

.btn-login {
    background: linear-gradient(90deg, #667eea, #764ba2);
    color: white;
    border: none;
    width: 100%;
    padding: 0.9rem;
    border-radius: 2rem;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 5px 12px rgba(102, 126, 234, 0.3);
    margin-top: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 18px rgba(102, 126, 234, 0.4);
}

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

.form-status {
    margin-top: 1rem;
    text-align: center;
    font-weight: 500;
    font-size: 0.85rem;
    color: #e74c3c;
    padding: 0.5rem;
    border-radius: 1rem;
}

.register-link {
    margin-top: 1.2rem;
    font-size: 0.85rem;
    text-align: center;
}

.register-link a {
    color: #6c5ce7;
    font-weight: 600;
    text-decoration: none;
    transition: color 0.2s;
}

.register-link a:hover {
    color: #a463f5;
}

.back-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    margin-top: 1rem;
    color: #5a5a7a;
    text-decoration: none;
    font-size: 0.85rem;
    transition: color 0.2s, transform 0.2s;
    width: 100%;
}

.back-link svg {
    width: 1rem;
    height: 1rem;
    stroke: currentColor;
    stroke-width: 2;
    fill: none;
}

.back-link:hover {
    color: #667eea;
    transform: translateX(-3px);
}

/* ---------- ریسپانسیو ---------- */
@media (max-width: 640px) {
    .auth-container {
        padding: 0 0.5rem;
        max-width: 95%;
    }
    .auth-card {
        padding: 1.5rem 1.2rem;
    }
    .input-group input {
        padding: 0.8rem 2.2rem;
        font-size: 0.9rem;
    }
    .btn-login {
        padding: 0.75rem;
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    body {
        padding: 0.5rem;
    }
    .auth-card {
        border-radius: 1.5rem;
        padding: 1.2rem 0.9rem;
    }
    .input-group {
        margin-bottom: 1rem;
    }
    .input-group input {
        padding: 0.7rem 2rem;
        font-size: 0.85rem;
    }
    .btn-login {
        padding: 0.65rem;
        font-size: 0.85rem;
    }
    .back-link {
        font-size: 0.75rem;
    }
}

@media (max-width: 360px) {
    .auth-card h2 {
        font-size: 1.5rem;
    }
    .input-group input {
        padding: 0.6rem 2rem;
    }
    .btn-login {
        padding: 0.6rem;
    }
}

@media (min-width: 768px) and (max-width: 1024px) {
    .auth-container {
        max-width: 450px;
    }
}

@media (max-height: 600px) {
    body {
        align-items: flex-start;
        padding-top: 2rem;
    }
    .auth-card {
        padding: 1.2rem;
    }
}