:root {
    --primary-color: #4361ee;
    --primary-hover: #3a56d4;
    --error-bg: #fee2e2;
    --error-text: #dc2626;
    --success-bg: #dcfce7;
    --success-text: #16a34a;
    --text-dark: #1e293b;
    --text-medium: #64748b;
    --bg-light: #f8fafc;
    --border-color: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --rounded: 0.75rem;
    --input-focus: 0 0 0 3px rgba(67, 97, 238, 0.2);
}

@font-face {
    font-family: 'IRANSans';
    src: url('/fonts/IRANSansWeb.woff2') format('woff2'),
         url('/fonts/IRANSansWeb.woff') format('woff'),
         url('/fonts/IRANSansWeb.ttf') format('truetype');
    font-weight: normal;
    font-style: normal;
    font-display: swap;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'IRANSans', sans-serif;
}

body {
    background-color: #f5f7fa;
    background-image: radial-gradient(circle at 10% 20%, rgba(67, 97, 238, 0.1) 0%, transparent 20%),
                      radial-gradient(circle at 90% 80%, rgba(67, 97, 238, 0.1) 0%, transparent 20%);
    color: var(--text-dark);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    line-height: 1.5;
}

.login-container {
    background-color: white;
    box-shadow: var(--shadow);
    border-radius: var(--rounded);
    padding: 2.5rem;
    width: 100%;
    max-width: 28rem;
    transition: all 0.3s ease;
    border: 1px solid rgba(0, 0, 0, 0.05);
    position: relative;
    overflow: hidden;
}

.login-container::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), #5e35b1);
}

.login-title {
    font-size: 1.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 2rem;
    color: var(--text-dark);
    position: relative;
    padding-bottom: 1rem;
}

.login-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    right: 50%;
    transform: translateX(50%);
    width: 60px;
    height: 3px;
    background-color: var(--primary-color);
    border-radius: 3px;
}

.error-message {
    background-color: var(--error-bg);
    color: var(--error-text);
    font-size: 0.875rem;
    padding: 0.75rem;
    border-radius: 0.375rem;
    margin-bottom: 1.5rem;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.success-message {
    background-color: var(--success-bg);
    color: var(--success-text);
    font-size: 0.875rem;
    padding: 0.75rem;
    border-radius: 0.375rem;
    margin-bottom: 1.5rem;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.form-group {
    margin-bottom: 1.5rem;
    position: relative;
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-medium);
}

.form-input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    font-size: 0.875rem;
    transition: all 0.2s;
    background-color: #fff;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: var(--input-focus);
}

.form-input.invalid {
    border-color: var(--error-text);
}

.form-input.valid {
    border-color: var(--success-text);
}

.input-hint {
    font-size: 0.75rem;
    color: var(--text-medium);
    margin-top: 0.25rem;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.input-hint.invalid {
    color: var(--error-text);
}

.submit-btn {
    width: 100%;
    background-color: var(--primary-color);
    color: white;
    padding: 0.75rem;
    border: none;
    border-radius: 0.375rem;
    font-weight: 500;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.submit-btn:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

.submit-btn:focus {
    outline: none;
    box-shadow: var(--input-focus);
}

.submit-btn:disabled {
    background-color: #94a3b8;
    cursor: not-allowed;
    transform: none;
}

.otp-container {
    display: flex;
    justify-content: space-between;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
    direction: ltr;
}

.otp-input {
    width: 3.5rem;
    height: 3.5rem;
    text-align: center;
    font-size: 1.25rem;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    transition: all 0.2s;
    direction: ltr;
    font-family: monospace;
    unicode-bidi: plaintext;
}

.otp-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: var(--input-focus);
}

.link-text {
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-medium);
    margin-top: 1.5rem;
}

.link-text a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.link-text a:hover {
    text-decoration: underline;
}

/* انیمیشن‌ها */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-5px); }
    40%, 80% { transform: translateX(5px); }
}

.shake {
    animation: shake 0.4s ease-in-out;
}

.login-container {
    animation: fadeIn 0.4s ease-out forwards;
}

/* واکنش‌گرایی */
@media (max-width: 640px) {
    .login-container {
        padding: 1.5rem;
    }
    
    .login-title {
        font-size: 1.25rem;
        margin-bottom: 1.5rem;
    }
    
    .otp-input {
        width: 3rem;
        height: 3rem;
        font-size: 1rem;
    }
}