/* CSS Variables - 深色主题配色 */
:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --primary-light: rgba(99, 102, 241, 0.1);
    --secondary: #8b5cf6;
    --background: #0f0f23;
    --surface: #1a1a2e;
    --surface-elevated: #252542;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border: #334155;
    --border-focus: #6366f1;
    --error: #ef4444;
    --success: #22c55e;
    --warning: #f59e0b;
    --font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 16px 64px rgba(0, 0, 0, 0.5);
}

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,100..1000;1,9..40,100..1000&family=Space+Grotesk:wght@300..700&display=swap');

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    background: var(--background);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    overflow-x: hidden;
}

/* Container */
.container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    position: relative;
}

/* Background Decoration */
.bg-decoration {
    position: fixed;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
    z-index: 0;
}

.circle {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.4;
}

.circle-1 {
    width: 600px;
    height: 600px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    top: -200px;
    right: -100px;
    animation: float1 20s ease-in-out infinite;
}

.circle-2 {
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, #ec4899, var(--primary));
    bottom: -100px;
    left: -100px;
    animation: float2 25s ease-in-out infinite;
}

.circle-3 {
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, var(--secondary), #06b6d4);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation: float3 15s ease-in-out infinite;
}

@keyframes float1 {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(-50px, 50px) scale(1.1); }
}

@keyframes float2 {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(30px, -30px) scale(0.9); }
}

@keyframes float3 {
    0%, 100% { transform: translate(-50%, -50%) scale(1); }
    50% { transform: translate(-40%, -60%) scale(1.2); }
}

/* Form Card */
.form-card {
    position: relative;
    z-index: 1;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 3rem;
    width: 100%;
    max-width: 600px;
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(20px);
    animation: slideUp 0.6s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.logo {
    margin-bottom: 1.5rem;
    display: inline-block;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.header h1 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Form Styles */
.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

@media (max-width: 540px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.required {
    color: var(--error);
}

input {
    padding: 0.875rem 1rem;
    font-size: 0.95rem;
    font-family: inherit;
    background: var(--surface-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    transition: all 0.2s ease;
    outline: none;
}

input::placeholder {
    color: var(--text-muted);
}

input:hover {
    border-color: var(--text-muted);
}

input:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px var(--primary-light);
    background: var(--surface);
}

input:invalid:not(:placeholder-shown) {
    border-color: var(--error);
}

/* Turnstile Container */
.turnstile-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 0;
}

.cf-turnstile {
    transform-origin: center;
}

.turnstile-note {
    font-size: 0.75rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.turnstile-note::before {
    content: '';
    width: 12px;
    height: 12px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2364748b'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M9 12l2 2 4-4m5.618-4.016A11.955 11.955 0 0112 2.944a11.955 11.955 0 01-8.618 3.04A12.02 12.02 0 003 9c0 5.591 3.824 10.29 9 11.622 5.176-1.332 9-6.03 9-11.622 0-1.042-.133-2.052-.382-3.016z'/%3E%3C/svg%3E");
    background-size: contain;
}

/* Submit Button */
.submit-btn {
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    font-family: inherit;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 0.5rem;
    position: relative;
    overflow: hidden;
}

.submit-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--primary-hover), #7c3aed);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.submit-btn:hover:not(:disabled)::before {
    opacity: 1;
}

.submit-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.4);
}

.submit-btn:active:not(:disabled) {
    transform: translateY(0);
}

.submit-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-text,
.btn-loader {
    position: relative;
    z-index: 1;
}

.btn-loader {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.spinner {
    width: 20px;
    height: 20px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Footer Note */
.footer-note {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
    text-align: center;
}

.footer-note p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.footer-note a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.2s;
}

.footer-note a:hover {
    color: var(--secondary);
    text-decoration: underline;
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    padding: 1rem 1.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    box-shadow: var(--shadow-md);
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 1000;
    max-width: 90%;
    text-align: center;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.toast.info {
    background: var(--surface-elevated);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.toast.success {
    background: linear-gradient(135deg, #059669, #10b981);
    color: white;
}

.toast.error {
    background: linear-gradient(135deg, #dc2626, #ef4444);
    color: white;
}

.toast.warning {
    background: linear-gradient(135deg, #d97706, #f59e0b);
    color: white;
}

/* Success Page Styles */
.success-card {
    text-align: center;
    padding: 4rem 3rem;
}

.success-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 2rem;
    background: linear-gradient(135deg, var(--success), #4ade80);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: successPop 0.5s ease-out;
}

@keyframes successPop {
    0% { transform: scale(0); }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

.success-icon svg {
    width: 40px;
    height: 40px;
    stroke: white;
    stroke-width: 3;
    fill: none;
    stroke-dasharray: 50;
    stroke-dashoffset: 50;
    animation: checkDraw 0.5s ease-out 0.3s forwards;
}

@keyframes checkDraw {
    to { stroke-dashoffset: 0; }
}

.success-card h1 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.success-card p {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    line-height: 1.7;
}

.success-card .email-highlight {
    color: var(--primary);
    font-weight: 600;
}

.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 2rem;
    padding: 0.875rem 1.5rem;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--primary);
    background: var(--primary-light);
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: all 0.2s ease;
}

.back-btn:hover {
    background: transparent;
    border-color: var(--primary);
}

/* Responsive Adjustments */
@media (max-width: 640px) {
    .form-card {
        padding: 2rem 1.5rem;
        margin: 1rem;
    }

    .header h1 {
        font-size: 1.5rem;
    }

    .success-card {
        padding: 2.5rem 1.5rem;
    }
}