/* General Styles */
:root {
    --primary-color: #667eea;
    --primary-color-hover: #764ba2;
    --background-gradient-start: #667eea;
    --background-gradient-end: #764ba2;
    --form-bg-color: rgba(255, 255, 255, 0.95);
    --text-color: #333;
    --input-border-color: #e2e8f0;
    --input-focus-border-color: #667eea;
    --box-shadow-color: rgba(0, 0, 0, 0.1);
    --success-color: #22543d;
    --success-bg: #f0fff4;
    --error-color: #c53030;
    --error-bg: #fee;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--background-gradient-start), var(--background-gradient-end));
    overflow: hidden;
    padding: 20px 0;
}

/* Form Container */
.form-container {
    background-color: var(--form-bg-color);
    padding: 40px 50px;
    border-radius: 12px;
    box-shadow: 0 10px 30px var(--box-shadow-color);
    width: 100%;
    max-width: 400px;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.form-container:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

/* Header */
.form-header {
    margin-bottom: 30px;
}

/* Error and Success Messages */
.error-message {
    margin-bottom: 20px;
}

.alert {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 10px;
    font-size: 0.9rem;
    font-weight: 500;
    border: 1px solid;
}

.alert-error {
    background-color: var(--error-bg);
    color: var(--error-color);
    border-color: #feb2b2;
}

.alert-success {
    background-color: var(--success-bg);
    color: var(--success-color);
    border-color: #9ae6b4;
}

.form-header h1 {
    color: var(--primary-color);
    font-size: 2.5rem;
    margin-bottom: 10px;
    font-weight: bold;
    letter-spacing: 1px;
}

.form-header p {
    color: #666;
}

/* Form & Input Fields */
.input-group {
    position: relative;
    margin-bottom: 25px;
}

.input-group .icon {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: #aaa;
    transition: color 0.3s ease;
}

.input-field {
    width: 100%;
    padding: 15px 15px 15px 50px;
    border: 1px solid var(--input-border-color);
    border-radius: 8px;
    font-size: 1rem;
    color: var(--text-color);
    background-color: #f9f9f9;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.input-field:focus {
    outline: none;
    border-color: var(--input-focus-border-color);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.2);
}

.input-field:focus+.icon {
    color: var(--primary-color);
}

.input-field::placeholder {
    color: #aaa;
}

/* Password Toggle */
.toggle-password {
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    cursor: pointer;
    color: #aaa;
}

.toggle-password:hover {
    color: var(--primary-color);
}


/* Options (Login page specific) */
.options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    font-size: 0.9rem;
}

.options label {
    display: flex;
    align-items: center;
    color: #555;
    cursor: pointer;
}

.options input[type="checkbox"] {
    margin-right: 8px;
}

.options a {
    color: var(--primary-color);
    text-decoration: none;
}

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

/* Submit Button */
.submit-btn {
    width: 100%;
    padding: 15px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

.submit-btn:hover {
    background-color: var(--primary-color-hover);
    transform: translateY(-2px);
}

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


/* Bottom Link */
.bottom-link {
    margin-top: 30px;
    font-size: 0.9rem;
    color: #555;
}

.bottom-link a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: bold;
}

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

/* Password Toggle */
.toggle-password {
    position: absolute;
    right: 45px;
    top: 50%;
    transform: translateY(-50%);
    color: #aaa;
    cursor: pointer;
    transition: color 0.3s ease;
}

.toggle-password:hover {
    color: var(--primary-color);
}

/* Select Field Styling */
select.input-field {
    appearance: none;
    background-image: url('data:image/svg+xml;charset=US-ASCII,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 4 5"><path fill="%23aaa" d="M2 0L0 2h4zm0 5L0 3h4z"/></svg>');
    background-repeat: no-repeat;
    background-position: right 15px center;
    background-size: 12px;
    padding-right: 50px;
}

select.input-field:focus {
    background-image: url('data:image/svg+xml;charset=US-ASCII,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 4 5"><path fill="%23667eea" d="M2 0L0 2h4zm0 5L0 3h4z"/></svg>');
}

/* Icon positioning for select fields */
.input-group:has(select) .icon {
    right: 45px;
}

/* 验证码样式 */
.captcha-group {
    display: flex;
    gap: 10px;
    align-items: center;
}

.captcha-input {
    flex: 1;
    padding: 15px;
    min-width: 0;
}

.captcha-container {
    display: flex;
    align-items: center;
    gap: 5px;
    flex-shrink: 0;
}

.captcha-container img {
    width: 120px;
    height: 40px;
    border: 1px solid var(--input-border-color);
    border-radius: 6px;
    cursor: pointer;
    transition: border-color 0.3s ease;
}

.captcha-container img:hover {
    border-color: var(--input-focus-border-color);
}

.refresh-captcha {
    background: none;
    border: 1px solid var(--input-border-color);
    border-radius: 6px;
    padding: 8px;
    cursor: pointer;
    color: #666;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
}

.refresh-captcha:hover {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
    transform: rotate(180deg);
}

.refresh-captcha:active {
    transform: rotate(180deg) scale(0.95);
}

/* 响应式设计 */
@media (max-width: 480px) {
    .captcha-group {
        flex-direction: column;
        gap: 15px;
    }
    
    .captcha-container {
        justify-content: center;
        width: 100%;
    }
    
    .captcha-input {
        width: 100%;
    }
}