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

:root {
    --primary-color: #3498db;
    --secondary-color: #2c3e50;
    --bg-color: #F5F5F5;
    --card-color: #FFFFFF;
    --text-primary: #333333;
    --text-secondary: #666666;
    --text-light: #999999;
    --border-color: #E0E0E0;
    --divider-color: #E5E5E5;
    --active-color: #07C160;
    --expired-color: #FA5151;
    --paused-color: #FF9F0A;
    --draft-color: #8E8E93;
    --error-color: #FF3B30;
    --warning-color: #FF9500;
    --toast-bg: rgba(0, 0, 0, 0.8);
    --hover-overlay: rgba(255, 255, 255, 0.1);
    --shadow-color: rgba(0, 0, 0, 0.1);
    --focus-glow: rgba(52, 152, 219, 0.1);
    
    font-size: clamp(0.875rem, 2vw, 1rem);
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
}

.header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--card-color);
    padding: clamp(0.75rem, 2vw, 0.9375rem);
    display: flex;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 10;
}

.back-btn {
    color: var(--card-color);
    font-size: clamp(1.5rem, 3vw, 1.75rem);
    background: none;
    border: 0.2rem solid var(--card-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: clamp(0.25rem, 0.75vw, 0.3125rem);
    padding: clamp(0.3rem, 0.75vw, 0.3125rem);
    border-radius: 10%;
    transition: background-color 0.2s;
}

.back-btn:hover {
    background-color: var(--hover-overlay);
}

.header-title {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 500;
    text-align: center;
    flex: 1;
    padding-right: clamp(2.5rem, 6vw, 3rem);
}

.container {
    padding: clamp(1rem, 3vw, 1.25rem);
    max-width: 37.5rem;
    margin: 0 auto;
}

.feedback-card {
    background: var(--card-color);
    border-radius: 0.75rem;
    padding: clamp(1.25rem, 4vw, 1.5rem);
    box-shadow: 0 0.125rem 0.5rem var(--shadow-color);
}

.card-title {
    font-size: clamp(1.1rem, 3.5vw, 1.25rem);
    font-weight: 600;
    margin-bottom: clamp(1rem, 3vw, 1.25rem);
    text-align: center;
}

.form-group {
    margin-bottom: clamp(1rem, 3vw, 1.25rem);
}

.form-label {
    display: block;
    font-size: clamp(0.9rem, 2.5vw, 1rem);
    font-weight: 500;
    margin-bottom: clamp(0.5rem, 1.5vw, 0.625rem);
    color: var(--text-primary);
}

.required::after {
    content: " *";
    color: var(--error-color);
}

.form-input {
    width: 100%;
    padding: clamp(0.75rem, 2vw, 0.9375rem);
    border: 0.0625rem solid var(--border-color);
    border-radius: 0.5rem;
    font-size: clamp(0.9rem, 2.5vw, 1rem);
    transition: all 0.2s;
    background: var(--card-color);
    resize: vertical;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.1875rem var(--focus-glow);
}

textarea.form-input {
    min-height: 9.375rem;
    line-height: 1.5;
}

.form-hint {
    font-size: clamp(0.8rem, 2.2vw, 0.875rem);
    color: var(--text-light);
    margin-top: clamp(0.25rem, 0.75vw, 0.3125rem);
}

.character-count {
    text-align: right;
    font-size: clamp(0.75rem, 2vw, 0.8125rem);
    color: var(--text-light);
    margin-top: 0.25rem;
}

.character-count.warning {
    color: var(--warning-color);
}

.character-count.error {
    color: var(--error-color);
}

.submit-section {
    margin-top: clamp(1.5rem, 4vw, 2rem);
}

.submit-button {
    width: 100%;
    padding: clamp(0.875rem, 2.5vw, 1rem);
    border-radius: 0.5rem;
    font-size: clamp(0.9rem, 2.5vw, 1rem);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    background: var(--primary-color);
    color: var(--card-color);
}

.submit-button:hover:not(:disabled) {
    background: var(--secondary-color);
    transform: translateY(-0.125rem);
}

.submit-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.success-card {
    text-align: center;
    padding: clamp(3rem, 8vw, 4rem) clamp(1.5rem, 4vw, 2rem);
    display: none;
}

.success-card.active {
    display: block;
}

.success-icon {
    font-size: clamp(4rem, 10vw, 5rem);
    color: var(--active-color);
    margin-bottom: clamp(1.5rem, 4vw, 2rem);
}

.success-title {
    font-size: clamp(1.5rem, 4vw, 1.75rem);
    font-weight: 600;
    margin-bottom: clamp(1rem, 3vw, 1.25rem);
    color: var(--text-primary);
}

.success-text {
    font-size: clamp(1rem, 3vw, 1.125rem);
    color: var(--text-secondary);
    margin-bottom: clamp(1.5rem, 4vw, 2rem);
    line-height: 1.6;
}

.success-actions {
    display: flex;
    gap: clamp(0.75rem, 2vw, 1rem);
    justify-content: center;
    margin-top: clamp(2rem, 5vw, 2.5rem);
}

.action-button {
    padding: clamp(0.75rem, 2vw, 1rem) clamp(1.5rem, 4vw, 2rem);
    border-radius: 0.5rem;
    font-size: clamp(0.9rem, 2.5vw, 1rem);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
}

.action-button.secondary {
    background: var(--bg-color);
    color: var(--text-primary);
}

.action-button.secondary:hover {
    background: var(--divider-color);
}

.action-button.primary {
    background: var(--primary-color);
    color: var(--card-color);
}

.action-button.primary:hover {
    background: var(--secondary-color);
}

@media (max-width: 30rem) {
    .container {
        padding: 0.75rem;
    }
    
    .feedback-card {
        padding: 1rem;
    }
    
    .success-actions {
        flex-direction: column;
    }
}