/* =================== HEADER =================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 56px;
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--accent-color) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 1rem;
    z-index: 100;
    box-shadow: 0 2px 12px rgba(37, 99, 235, 0.2);
}

.header-icon {
    position: absolute;
    left: 1rem;
    width: 32px;
    height: 32px;
    border-radius: 6px;
    object-fit: cover;
    flex-shrink: 0;
}

.header-title {
    color: var(--white);
    font-size: 1.1rem;
    font-weight: 600;
}

/* =================== BOTTOM NAVIGATION =================== */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: var(--white);
    display: flex;
    align-items: center;
    justify-content: space-around;
    border-top: 1px solid #e0e0e0;
    z-index: 100;
    padding-bottom: env(safe-area-inset-bottom, 0);
}

.nav-btn {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 0;
    background: none;
    border: none;
    color: #999;
    font-size: 0.7rem;
    cursor: pointer;
    transition: color 0.2s;
}

.nav-btn.active {
    color: var(--primary-color);
}

.nav-btn-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    margin-bottom: 0.2rem;
}

.nav-btn-icon img {
    width: 22px;
    height: 22px;
    filter: brightness(0) saturate(100%) invert(68%) sepia(0%) saturate(0%) hue-rotate(0deg) brightness(90%) contrast(90%);
    transition: filter 0.2s;
}

.nav-btn.active .nav-btn-icon img {
    filter: brightness(0) saturate(100%) invert(30%) sepia(93%) saturate(1352%) hue-rotate(213deg) brightness(97%) contrast(93%);
}

/* =================== CONTENT SCREENS =================== */
.content-screen {
    display: none;
    padding: 72px 1rem 76px;
    min-height: 100vh;
}

.content-screen.active {
    display: block;
}