:root {
    --primary: #6B8DB5;
    --primary-hover: #7A8B9C;
    --primary-light: rgba(142, 154, 175, 0.12);
    --dark: #262933;
    --bg: #F8F9FA;
    --text: #262933;
    --text-secondary: #7E8494;
    --border: #E4E6EA;
    --card-bg: rgba(255, 255, 255, 0.72);
    --error: #B85C5C;
    --error-bg: rgba(184, 92, 92, 0.08);
    --success: #7A9E7E;
    --success-bg: rgba(122, 158, 126, 0.08);
    --shadow-soft: 0 8px 32px rgba(46, 43, 39, 0.08);
    --shadow-medium: 0 16px 48px rgba(46, 43, 39, 0.12);
    --shadow-button: 0 4px 16px rgba(142, 154, 175, 0.35);
    --radius-lg: 24px;
    --radius-md: 16px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    background: linear-gradient(145deg, #D4CCC4 0%, #B8BCC8 40%, #A8B0BC 70%, #C2BEB8 100%);
    position: relative;
    overflow: hidden;
}

/* Subtle noise texture overlay */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.035;
    pointer-events: none;
    z-index: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
    background-repeat: repeat;
    background-size: 256px 256px;
}

/* Soft ambient light blobs */
body::after {
    content: '';
    position: fixed;
    top: -20%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(142, 154, 175, 0.15) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

/* Login Card - Glassmorphism */
.login-container {
    background: var(--card-bg);
    backdrop-filter: blur(40px) saturate(1.4);
    -webkit-backdrop-filter: blur(40px) saturate(1.4);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.5);
    box-shadow: var(--shadow-medium), inset 0 1px 0 rgba(255, 255, 255, 0.6);
    width: 100%;
    max-width: 440px;
    padding: 48px 44px 40px;
    position: relative;
    z-index: 1;
    animation: cardFadeIn 0.8s cubic-bezier(0.4, 0, 0.2, 1) both;
}

@keyframes cardFadeIn {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.98);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* Logo Area */
.login-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 36px;
}

.login-logo svg {
    width: 40px;
    height: 40px;
    flex-shrink: 0;
}

.login-logo .brand-name {
    font-family: 'DM Sans', sans-serif;
    font-size: 22px;
    font-weight: 600;
    color: var(--dark);
    letter-spacing: -0.3px;
}

/* Header */
.login-header {
    text-align: center;
    margin-bottom: 40px;
}

.login-header h1 {
    font-family: 'Playfair Display', Georgia, serif;
    font-size: 28px;
    font-weight: 500;
    color: var(--dark);
    margin-bottom: 10px;
    letter-spacing: -0.2px;
    line-height: 1.3;
}

.login-header p {
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 400;
    line-height: 1.5;
}

/* Form Groups */
.form-group {
    margin-bottom: 28px;
    position: relative;
}

.form-group label {
    display: block;
    margin-bottom: 10px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    letter-spacing: 0.3px;
    text-transform: uppercase;
}

/* Underline-style input */
.form-group input[type="text"],
.form-group input[type="email"] {
    width: 100%;
    padding: 12px 0;
    border: none;
    border-bottom: 1.5px solid var(--border);
    background: transparent;
    font-family: 'DM Sans', sans-serif;
    font-size: 15px;
    color: var(--text);
    transition: var(--transition);
    outline: none;
    letter-spacing: 0.1px;
}

.form-group input::placeholder {
    color: #C4C0B8;
    font-weight: 300;
}

.form-group input:focus {
    border-bottom-color: var(--primary);
}

.form-group input.error {
    border-bottom-color: var(--error);
}

/* Underline focus animation */
.input-wrapper {
    position: relative;
}

.input-wrapper::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 1.5px;
    background: var(--primary);
    transition: var(--transition);
    transform: translateX(-50%);
}

.input-wrapper:focus-within::after {
    width: 100%;
}

.input-wrapper.has-error::after {
    background: var(--error);
}

/* Code Input Group */
.code-input-group {
    display: flex;
    gap: 16px;
    align-items: flex-end;
}

.code-input-group .input-wrapper {
    flex: 1;
}

.btn-send-code {
    padding: 10px 20px;
    background: transparent;
    color: var(--primary);
    border: 1.5px solid var(--primary);
    border-radius: 10px;
    font-family: 'DM Sans', sans-serif;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
    min-width: 120px;
    letter-spacing: 0.2px;
    flex-shrink: 0;
}

.btn-send-code:hover:not(:disabled) {
    background: var(--primary-light);
    border-color: var(--primary-hover);
    color: var(--primary-hover);
}

.btn-send-code:active:not(:disabled) {
    transform: scale(0.97);
}

.btn-send-code:disabled {
    background: var(--primary-light);
    border-color: var(--border);
    color: var(--text-secondary);
    cursor: not-allowed;
}

/* Login Button */
.btn-login {
    width: 100%;
    padding: 15px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 12px;
    font-family: 'DM Sans', sans-serif;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 12px;
    letter-spacing: 0.3px;
    box-shadow: var(--shadow-button);
    position: relative;
    overflow: hidden;
}

.btn-login::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(255,255,255,0.15) 0%, transparent 50%);
    pointer-events: none;
}

.btn-login:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 6px 24px rgba(142, 154, 175, 0.45);
}

.btn-login:active:not(:disabled) {
    transform: translateY(0);
    box-shadow: var(--shadow-button);
}

.btn-login:disabled {
    opacity: 0.55;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* Error & Success Messages */
.error-message {
    color: var(--error);
    font-size: 12px;
    margin-top: 8px;
    display: none;
    font-weight: 400;
    letter-spacing: 0.1px;
}

.error-message.show {
    display: block;
    animation: messageFade 0.3s ease both;
}

.success-message {
    color: var(--success);
    font-size: 12px;
    margin-top: 8px;
    font-weight: 400;
    letter-spacing: 0.1px;
    animation: messageFade 0.3s ease both;
}

@keyframes messageFade {
    from { opacity: 0; transform: translateY(-4px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Enterprise Info */
.enterprise-info {
    background: var(--primary-light);
    padding: 14px 18px;
    border-radius: 12px;
    margin-bottom: 24px;
    display: none;
    border: 1px solid rgba(142, 154, 175, 0.1);
}

.enterprise-info.show {
    display: block;
    animation: messageFade 0.3s ease both;
}

.enterprise-info .label {
    font-size: 11px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.enterprise-info .name {
    font-size: 14px;
    font-weight: 600;
    color: var(--dark);
}

/* Loading Spinner */
.loading {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 0.7s linear infinite;
    margin-right: 8px;
    vertical-align: middle;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Footer */
.footer {
    text-align: center;
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
}

.footer p {
    font-size: 12px;
    color: var(--text-secondary);
    font-weight: 400;
    letter-spacing: 0.2px;
}

/* Responsive */
@media (max-width: 480px) {
    .login-container {
        padding: 36px 28px 32px;
        border-radius: 20px;
    }

    .login-header h1 {
        font-size: 24px;
    }

    .code-input-group {
        flex-direction: column;
        gap: 12px;
    }

    .btn-send-code {
        width: 100%;
        min-width: unset;
    }
}

/* 盲文浮点背景效果 - 与首页一致 */
.braille-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    background:
        /* 盲文点阵纹理 */
        radial-gradient(circle, rgba(100,100,120,0.12) 1px, transparent 1px),
        radial-gradient(circle, rgba(100,100,120,0.08) 0.5px, transparent 0.5px);
    background-size: 8px 8px, 4px 4px;
    animation: bumpFloat 20s ease-in-out infinite;
}

@keyframes bumpFloat {
    0%, 100% { background-position: 0 0, 2px 2px; }
    25% { background-position: 2px 1px, 4px 3px; }
    50% { background-position: 1px 2px, 3px 4px; }
    75% { background-position: -1px 1px, 1px 5px; }
}

/* Smooth focus for accessibility */
*:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
    border-radius: 4px;
}

input:focus-visible {
    outline: none;
}