@media (max-width: 768px) {
    .navbar {
        padding: 12px 0;
    }

    .nav-container {
        padding: 0 16px;
    }

    .nav-brand h1 {
        font-size: 1.25rem;
    }

    .nav-menu {
        display: none;
    }

    .nav-profile {
        display: none;
    }

    .main-content {
        padding-top: 60px;
    }

    .hero {
        padding: 40px 16px;
    }

    .hero-title {
        font-size: 2.5rem;
        letter-spacing: 4px;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-actions {
        flex-direction: column;
        width: 100%;
    }

    .hero-actions .btn {
        width: 100%;
    }

    .features {
        padding: 40px 16px;
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .feature-card {
        padding: 24px;
    }

    .disclaimer {
        padding: 32px 16px;
    }

    .modal-content {
        padding: 24px;
        margin: 16px;
    }

    .modal-title {
        font-size: 1.25rem;
    }

    .filter-tabs {
        gap: 8px;
    }

    .filter-tab {
        padding: 6px 12px;
        font-size: 0.8rem;
    }

    .toast {
        left: 16px;
        right: 16px;
        bottom: 16px;
    }

    .goal-card {
        flex-direction: column;
        align-items: flex-start;
    }

    .goal-checkbox {
        align-self: flex-start;
    }

    .goal-actions {
        width: 100%;
        justify-content: flex-end;
    }

    .intro-card {
        padding: 24px;
    }

    .intro-steps {
        gap: 16px;
    }

    .intro-step {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .intro-tips {
        padding: 16px;
    }

    .results-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
        letter-spacing: 2px;
    }

    .hero-subtitle {
        font-size: 0.9rem;
    }

    .btn {
        padding: 10px 20px;
        font-size: 0.85rem;
    }

    .feature-card {
        padding: 20px;
    }

    .feature-icon {
        width: 56px;
        height: 56px;
    }

    .feature-title {
        font-size: 1.25rem;
    }

    .form-input,
    .form-textarea,
    .form-select {
        padding: 10px 14px;
        font-size: 0.9rem;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .hero-title {
        font-size: 3rem;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1025px) {
    .nav-menu {
        display: flex;
    }

    .nav-profile {
        display: flex;
    }
}

.bottom-nav {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(20px);
    border-top: 1px solid var(--border);
    z-index: 1000;
    padding: 8px 0;
}

.bottom-nav-items {
    display: flex;
    justify-content: space-around;
    align-items: center;
    max-width: 400px;
    margin: 0 auto;
}

.bottom-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 8px 16px;
    color: var(--text-secondary);
    transition: color 0.2s ease;
}

.bottom-nav-item:hover,
.bottom-nav-item.active {
    color: var(--accent);
}

.bottom-nav-icon {
    width: 24px;
    height: 24px;
    margin-bottom: 4px;
}

.bottom-nav-label {
    font-size: 0.75rem;
    font-weight: 500;
}

@media (max-width: 768px) {
    .bottom-nav {
        display: block;
    }

    .main-content {
        padding-bottom: 80px;
    }
}